Computer simulation of vehicle performance
Discussion
Hi Stan,
We seem to have some differences in the results of our computer simulations based on the same data. Perhaps it might help both of us if we run some simplified test data through our programs and make sure we both have the correct algorithms.
I've designed a very basic simulation data pack with most of the bells and whistles eliminated for now. We can put them back in later.
Engine torque 200 ft lbs everywhere from idle to 6000 rpm (rev limit)
No transmission losses so above are essentially wheel figures
Tyre radius 1.000 ft
A single gear of total ratio 2.5 (28.559 mph/1000 rpm)
Mass 3000 lbs (no rotational inertia for now re wheels or engine components)
Frontal area 22 sq ft
Cd 0.33
Rolling resistance 0.013
What do you get for times and speeds for 20, 220, 440, 880, 1760 yards. What is the top speed and at what rpm?
We seem to have some differences in the results of our computer simulations based on the same data. Perhaps it might help both of us if we run some simplified test data through our programs and make sure we both have the correct algorithms.
I've designed a very basic simulation data pack with most of the bells and whistles eliminated for now. We can put them back in later.
Engine torque 200 ft lbs everywhere from idle to 6000 rpm (rev limit)
No transmission losses so above are essentially wheel figures
Tyre radius 1.000 ft
A single gear of total ratio 2.5 (28.559 mph/1000 rpm)
Mass 3000 lbs (no rotational inertia for now re wheels or engine components)
Frontal area 22 sq ft
Cd 0.33
Rolling resistance 0.013
What do you get for times and speeds for 20, 220, 440, 880, 1760 yards. What is the top speed and at what rpm?
Hi Dave,
Slow day, or you just want to pick on the poor yank?
Not sure how your software works but I get 28.57143 mph/1000 rpm 
I am using a 1 ft roll out
If it matters I have the Track BP = 29.92126
60 Foot ET = 4.1562
330 Foot ET = 10.7970
1/8 Mile ET = 15.6822
1/8 Mile MPH = 52.3750
1000 Foot ET = 19.5965
1/4 Mile ET = 22.7513
1/4 Mile MPH = 73.1093
1/2 Mile ET = 33.193 -- 1/2 Mile MPH = 98.02
1 KM ET = 37.467 -- 1 KM MPH = 106.36
1 Mile ET = 49.225 -- 1 Mile MPH = 124.48
2 KM ET = 56.030 -- 2 KM MPH = 132.15
3 KM ET = 72.149 -- 3 KM MPH = 144.29
2 Mile ET = 75.520 -- 2 Mile MPH = 145.97
4 KM ET = 87.301 -- 4 KM MPH = 150.44
5 KM ET = 97.549 -- 5 KM MPH = 152.97
3 Mile ET = 99.490 -- 3 Mile MPH = 153.31
6 KM ET = 116.462 -- 6 KM MPH = 155.50
4 Mile ET = 122.747 -- 4 Mile MPH = 155.92
7 KM ET = 130.807 -- 7 KM MPH = 156.43
8 KM ET = 145.086 -- 8 KM MPH = 156.93
5 Mile ET = 145.752 -- 5 Mile MPH = 156.93
9 KM ET = 159.331 -- 9 KM MPH = 157.18
6 Mile ET = 168.668 -- 6 Mile MPH = 157.35
10 KM ET = 173.557 -- 10 KM MPH = 157.35
11 KM ET = 187.774 -- 11 KM MPH = 157.44
7 Mile ET = 191.545 -- 7 Mile MPH = 157.44
12 KM ET = 202.016 -- 12 KM MPH = 157.52
8 Mile ET = 214.438 -- 8 Mile MPH = 157.52
13 KM ET = 216.217 -- 13 KM MPH = 157.52
14 KM ET = 230.417 -- 14 KM MPH = 157.52
9 Mile ET = 237.292 -- 9 Mile MPH = 157.52
15 KM ET = 244.618 -- 15 KM MPH = 157.52
16 KM ET = 258.819 -- 16 KM MPH = 157.52
10 Mile ET = 260.146 -- 10 Mile MPH = 157.52
_________________________________Force____Aero_____Rolling__Elapsed_________Accele
RPM______MPH___Velocity__Motor_____@_____dynamic___Resist.___Time______Totalration
________________ft/sec__Torque___Wheel__Drag_-_HP____HP______(ET)__Distance_in_G's
_5507.3157.44__230.908___200.0___500.0___193.219___16.373_198.8011____7.3173__.000
_5510.3157.52__231.031___200.0___500.0___193.530___16.382_330.6517___13.0850__.000
_5530.9158.03__231.773___200.0___500.0___195.400_16.435
Stan
Slow day, or you just want to pick on the poor yank?
Not sure how your software works but I get 28.57143 mph/1000 rpm I am using a 1 ft roll out
If it matters I have the Track BP = 29.92126
60 Foot ET = 4.1562
330 Foot ET = 10.7970
1/8 Mile ET = 15.6822
1/8 Mile MPH = 52.3750
1000 Foot ET = 19.5965
1/4 Mile ET = 22.7513
1/4 Mile MPH = 73.1093
1/2 Mile ET = 33.193 -- 1/2 Mile MPH = 98.02
1 KM ET = 37.467 -- 1 KM MPH = 106.36
1 Mile ET = 49.225 -- 1 Mile MPH = 124.48
2 KM ET = 56.030 -- 2 KM MPH = 132.15
3 KM ET = 72.149 -- 3 KM MPH = 144.29
2 Mile ET = 75.520 -- 2 Mile MPH = 145.97
4 KM ET = 87.301 -- 4 KM MPH = 150.44
5 KM ET = 97.549 -- 5 KM MPH = 152.97
3 Mile ET = 99.490 -- 3 Mile MPH = 153.31
6 KM ET = 116.462 -- 6 KM MPH = 155.50
4 Mile ET = 122.747 -- 4 Mile MPH = 155.92
7 KM ET = 130.807 -- 7 KM MPH = 156.43
8 KM ET = 145.086 -- 8 KM MPH = 156.93
5 Mile ET = 145.752 -- 5 Mile MPH = 156.93
9 KM ET = 159.331 -- 9 KM MPH = 157.18
6 Mile ET = 168.668 -- 6 Mile MPH = 157.35
10 KM ET = 173.557 -- 10 KM MPH = 157.35
11 KM ET = 187.774 -- 11 KM MPH = 157.44
7 Mile ET = 191.545 -- 7 Mile MPH = 157.44
12 KM ET = 202.016 -- 12 KM MPH = 157.52
8 Mile ET = 214.438 -- 8 Mile MPH = 157.52
13 KM ET = 216.217 -- 13 KM MPH = 157.52
14 KM ET = 230.417 -- 14 KM MPH = 157.52
9 Mile ET = 237.292 -- 9 Mile MPH = 157.52
15 KM ET = 244.618 -- 15 KM MPH = 157.52
16 KM ET = 258.819 -- 16 KM MPH = 157.52
10 Mile ET = 260.146 -- 10 Mile MPH = 157.52
_________________________________Force____Aero_____Rolling__Elapsed_________Accele
RPM______MPH___Velocity__Motor_____@_____dynamic___Resist.___Time______Totalration
________________ft/sec__Torque___Wheel__Drag_-_HP____HP______(ET)__Distance_in_G's
_5507.3157.44__230.908___200.0___500.0___193.219___16.373_198.8011____7.3173__.000
_5510.3157.52__231.031___200.0___500.0___193.530___16.382_330.6517___13.0850__.000
_5530.9158.03__231.773___200.0___500.0___195.400_16.435
Stan
Stan Weiss said:
Hi Dave,
Slow day, or you just want to pick on the poor yank? Not sure how your software works but I get 28.57143 mph/1000 rpm
Hmmm. I was hoping to agree on the basic maths bits at the very least.Slow day, or you just want to pick on the poor yank?
Not sure how your software works but I get 28.57143 mph/1000 rpm 1000 x 60 / 2.5 x 2 x pi / 5280 = 28.55993
Maybe check your value for pi or there's some rounding error going on.
Stan Weiss said:
I am using a 1 ft roll out
If it matters I have the Track BP = 29.92126
60 Foot ET = 4.1562
330 Foot ET = 10.7970
1/8 Mile ET = 15.6822
1/8 Mile MPH = 52.3750
1000 Foot ET = 19.5965
1/4 Mile ET = 22.7513
1/4 Mile MPH = 73.1093
1/2 Mile ET = 33.193 -- 1/2 Mile MPH = 98.02
1 Mile ET = 49.225 -- 1 Mile MPH = 124.48
2 Mile ET = 75.520 -- 2 Mile MPH = 145.97
Ok we have some strangeness going on. I agree your top speed of 157 mph so within narrow limits we agree on the aero and rolling drag. Your ETs are quite different though at the bottom end of the range.If it matters I have the Track BP = 29.92126
60 Foot ET = 4.1562
330 Foot ET = 10.7970
1/8 Mile ET = 15.6822
1/8 Mile MPH = 52.3750
1000 Foot ET = 19.5965
1/4 Mile ET = 22.7513
1/4 Mile MPH = 73.1093
1/2 Mile ET = 33.193 -- 1/2 Mile MPH = 98.02
1 Mile ET = 49.225 -- 1 Mile MPH = 124.48
2 Mile ET = 75.520 -- 2 Mile MPH = 145.97
60 Foot ET = 4.93 @ 16.6
330 Foot ET = 11.61 @ 38.4
1/8 Mile ET = 16.51
1/8 Mile MPH = 53.4
1/4 Mile ET = 23.58
1/4 Mile MPH = 73.4
1/2 Mile ET = 34.03 -- 1/2 Mile MPH = 98.0
1 Mile ET = 50.06 -- 1 Mile MPH = 124.4
2 Mile ET = 76.35 -- 2 Mile MPH = 145.9
Take out the "rollout" whatever that is and just launch the car instantaneously at 200 ft lbs. However I suspect this will just increase the differences though. You should find the car launches at 0.1537 G.
Wheel force = 200 x 2.5 = 500
rolling resistance = 0.013 x 3000 = 39
Net force = 461
Accel = 461/3000 = 0.1537 G
You appear to be accelerating initially much faster than this which is impossible.
Just using the simple Newtonian equation S = ut + 0.5at^2 :-->
Distance = 60 ft = 18.288m
Accel = 0.1537 x 9.80665 = 1.5073 m/s^2
t^2 = 18.288 / 1.5073 x 2 = 24.27
t = 4.93 - as my program calculates.
Sort your way through that lot and hopefully some booboo will show up in the programming.
OK, made a programing change so that I can use zero roll out.
60 Foot ET = 4.9313
330 Foot ET = 11.6133
1/8 Mile ET = 16.5075
1/8 Mile MPH = 52.3131
1000 Foot ET = 20.4257
1/4 Mile ET = 23.5828
1/4 Mile MPH = 73.0214
1/2 Mile ET = 34.029 -- 1/2 Mile MPH = 98.01
1 KM ET = 38.304 -- 1 KM MPH = 106.31
1 Mile ET = 50.063 -- 1 Mile MPH = 124.45
2 KM ET = 56.869 -- 2 KM MPH = 132.15
3 KM ET = 72.988 -- 3 KM MPH = 144.30
2 Mile ET = 76.360 -- 2 Mile MPH = 146.01
4 KM ET = 88.141 -- 4 KM MPH = 150.46
5 KM ET = 98.390 -- 5 KM MPH = 152.95
3 Mile ET = 100.331 -- 3 Mile MPH = 153.29
6 KM ET = 117.303 -- 6 KM MPH = 155.51
4 Mile ET = 123.587 -- 4 Mile MPH = 155.94
7 KM ET = 131.647 -- 7 KM MPH = 156.45
8 KM ET = 145.927 -- 8 KM MPH = 156.97
5 Mile ET = 146.593 -- 5 Mile MPH = 156.97
9 KM ET = 160.172 -- 9 KM MPH = 157.22
6 Mile ET = 169.506 -- 6 Mile MPH = 157.31
10 KM ET = 174.401 -- 10 KM MPH = 157.39
11 KM ET = 188.622 -- 11 KM MPH = 157.48
7 Mile ET = 192.392 -- 7 Mile MPH = 157.48
12 KM ET = 202.827 -- 12 KM MPH = 157.48
8 Mile ET = 215.252 -- 8 Mile MPH = 157.48
13 KM ET = 217.031 -- 13 KM MPH = 157.48
Stan
60 Foot ET = 4.9313
330 Foot ET = 11.6133
1/8 Mile ET = 16.5075
1/8 Mile MPH = 52.3131
1000 Foot ET = 20.4257
1/4 Mile ET = 23.5828
1/4 Mile MPH = 73.0214
1/2 Mile ET = 34.029 -- 1/2 Mile MPH = 98.01
1 KM ET = 38.304 -- 1 KM MPH = 106.31
1 Mile ET = 50.063 -- 1 Mile MPH = 124.45
2 KM ET = 56.869 -- 2 KM MPH = 132.15
3 KM ET = 72.988 -- 3 KM MPH = 144.30
2 Mile ET = 76.360 -- 2 Mile MPH = 146.01
4 KM ET = 88.141 -- 4 KM MPH = 150.46
5 KM ET = 98.390 -- 5 KM MPH = 152.95
3 Mile ET = 100.331 -- 3 Mile MPH = 153.29
6 KM ET = 117.303 -- 6 KM MPH = 155.51
4 Mile ET = 123.587 -- 4 Mile MPH = 155.94
7 KM ET = 131.647 -- 7 KM MPH = 156.45
8 KM ET = 145.927 -- 8 KM MPH = 156.97
5 Mile ET = 146.593 -- 5 Mile MPH = 156.97
9 KM ET = 160.172 -- 9 KM MPH = 157.22
6 Mile ET = 169.506 -- 6 Mile MPH = 157.31
10 KM ET = 174.401 -- 10 KM MPH = 157.39
11 KM ET = 188.622 -- 11 KM MPH = 157.48
7 Mile ET = 192.392 -- 7 Mile MPH = 157.48
12 KM ET = 202.827 -- 12 KM MPH = 157.48
8 Mile ET = 215.252 -- 8 Mile MPH = 157.48
13 KM ET = 217.031 -- 13 KM MPH = 157.48
Stan
Edited by Stan Weiss on Friday 12th June 22:24
Edited by Stan Weiss on Friday 12th June 22:27
OK, the times are now right at the bottom end but the speeds are still wrong and as they are both functions of the same acceleration curve I don't see how that is possible.
There must be another offset in the program somewhere which is reducing the speeds. I wonder.... On a real 1/4 mile track the speeds are worked out as the average over some distance leading up to each marker rather than an instantaneous speed at distance. Is that what's built in perhaps?
There must be another offset in the program somewhere which is reducing the speeds. I wonder.... On a real 1/4 mile track the speeds are worked out as the average over some distance leading up to each marker rather than an instantaneous speed at distance. Is that what's built in perhaps?
Now for some of the bells and whistles. A big factor in a real car is the rotating / reciprocating inertia.
1) Wheel and tyre mass
2) Crankshaft, flywheel, pistons
Without these factors built in to the equations a low powered, i.e. non grip limited, car will accelerate drastically differently to the correct model, especially in the low gears and most particularly if the engine is high revving and therefore high geared.
To give you an example of my own 2 litre Ford Focus which is not particularly high revving and therefore nowhere near the worst case scenario, the inertia in first gear is equivalent to an additional 1/4 of the base vehicle mass.
On a friend's high revving motorbike engined hillclimb single seater the inertia in 1st is equivalent to an additional 50% of the base vehicle mass! i.e. it soaks up 1/3 of the engine's horsepower.
How does your program account correctly for these?
1) Wheel and tyre mass
2) Crankshaft, flywheel, pistons
Without these factors built in to the equations a low powered, i.e. non grip limited, car will accelerate drastically differently to the correct model, especially in the low gears and most particularly if the engine is high revving and therefore high geared.
To give you an example of my own 2 litre Ford Focus which is not particularly high revving and therefore nowhere near the worst case scenario, the inertia in first gear is equivalent to an additional 1/4 of the base vehicle mass.
On a friend's high revving motorbike engined hillclimb single seater the inertia in 1st is equivalent to an additional 50% of the base vehicle mass! i.e. it soaks up 1/3 of the engine's horsepower.
How does your program account correctly for these?
Pumaracing said:
OK, the times are now right at the bottom end but the speeds are still wrong and as they are both functions of the same acceleration curve I don't see how that is possible.
There must be another offset in the program somewhere which is reducing the speeds. I wonder.... On a real 1/4 mile track the speeds are worked out as the average over some distance leading up to each marker rather than an instantaneous speed at distance. Is that what's built in perhaps?
I think the speeds at the strip are measured over a 20ft distanceThere must be another offset in the program somewhere which is reducing the speeds. I wonder.... On a real 1/4 mile track the speeds are worked out as the average over some distance leading up to each marker rather than an instantaneous speed at distance. Is that what's built in perhaps?
I think it's actually 20 yards not feet, at least at the 1/4 mile point and for the particular track I found data for online many years ago. It may well vary with different types of timing equipment and certainly it can't be the average over 20 yards for the 60 foot point or the number would be about half the true speed and therefore meaningless.
Anyway I don't think that's the problem in Stan's calcs because his speeds have proportionally different discrepancies at different distance points. His speed now at 220 yards of 52.31 mph (should be 53.4 mph) appears to be the speed actually pertaining at 210 yards but his speed of 73.02 mph at 440 yards (should be 73.4 mph) is not the true speed for 430 yards, it's actually about the true speed at 435 yards.
Anyway, I'm sure he'll find it.
Anyway I don't think that's the problem in Stan's calcs because his speeds have proportionally different discrepancies at different distance points. His speed now at 220 yards of 52.31 mph (should be 53.4 mph) appears to be the speed actually pertaining at 210 yards but his speed of 73.02 mph at 440 yards (should be 73.4 mph) is not the true speed for 430 yards, it's actually about the true speed at 435 yards.
Anyway, I'm sure he'll find it.
Dave,
Yes, these are instantaneous speeds above the 1/4 mile.
I let the user of my software enter a power loss percentage for each transmission gear and he can also enter a tire grow percentage for each gear. With some drag tires this can make a big difference at high speeds.
How do you handle the difference in HP based on the type of dyno test done?
Steady state test or acceleration rate of xxx RPM /Second each of these will show a different HP for the same engine.
Stan
................Acceleration.and.Top.Speed.Prediction.Chart.
...................................Force....Aero.....Rolling..Elapsed...........Accele
..RPM......MPH...Velocity..Motor.....@.....dynamic...Resist....Time......Total..ration
..................ft/sec..Torque...Wheel..Drag.-.HP....HP......(ET)....Distance.in.G's
....1.0....0.00......000...200.0.....0.0.......000......000.....0000.......000.....000
....1.0....0.03......042...200.0...500.0.......000......003.....0085.......000.....154
....2.0....0.06......084...200.0...500.0.......000......006.....0170.......001.....154
...10.0....0.29......419...200.0...500.0.......000......030.....0848.......018.....154
..100.0....2.86....4.190...200.0...500.0.......001......297.....8477.....1.776.....154
..175.0....5.00....7.333...200.0...500.0.......006......520...1.4838.....5.442.....154
..200.0....5.71....8.381...200.0...500.0.......009......594...1.6959.....7.108.....153
..300.0....8.57...12.571...200.0...500.0.......031......891...2.5453....16.007.....153
..350.0...10.00...14.667...200.0...500.0.......050....1.040...2.9706....21.799.....153
..400.0...11.43...16.762...200.0...500.0.......074....1.189...3.3964....28.490.....153
..500.0...14.29...20.952...200.0...500.0.......144....1.486...4.2497....44.582.....152
..525.0...15.00...22.000...200.0...500.0.......167....1.560...4.4634....49.172.....152
..579.5...16.56...24.294...200.0...500.0.......225....1.723...4.9322....60.023.....152
..600.0...17.14...25.143...200.0...500.0.......249....1.783...5.1058....64.315.....152
..700.0...20.00...29.333...200.0...500.0.......396....2.080...5.9654....87.730.....151
..800.0...22.86...33.524...200.0...500.0.......591....2.377...6.8290...114.873.....150
..875.0...25.00...36.667...200.0...500.0.......774....2.600...7.4798...137.712.....150
..900.0...25.71...37.714...200.0...500.0.......842....2.674...7.6973...145.802.....150
.1000.0...28.57...41.905...200.0...500.0.....1.155....2.971...8.5709...180.580.....149
.1050.0...30.00...44.000...200.0...500.0.....1.337....3.120...9.0098...199.436.....148
.1100.0...31.43...46.095...200.0...500.0.....1.537....3.269...9.4504...219.282.....148
.1200.0...34.29...50.286...200.0...500.0.....1.996....3.566..10.3366...261.990.....146
.1225.0...35.00...51.333...200.0...500.0.....2.123....3.640..10.5593...273.304.....146
.1300.0...37.14...54.476...200.0...500.0.....2.537....3.863..11.2302...308.799.....145
.1342.5...38.36...56.268...200.0...500.0.....2.796....3.990..11.6146...330.086.....145
.1400.0...40.00...58.667...200.0...500.0.....3.169....4.160..12.1319...359.812.....144
.1500.0...42.86...62.857...200.0...500.0.....3.898....4.457..13.0425...415.146.....142
.1575.0...45.00...66.000...200.0...500.0.....4.512....4.680..13.7318...459.560.....141
.1600.0...45.71...67.048...200.0...500.0.....4.730....4.754..13.9629...474.931.....141
.1700.0...48.57...71.238...200.0...500.0.....5.674....5.051..14.8939...539.308.....139
.1750.0...50.00...73.333...200.0...500.0.....6.189....5.200..15.3637...573.268.....138
.1800.0...51.43...75.429...200.0...500.0.....6.735....5.349..15.8365...608.437.....137
.1870.3...53.44...78.383...200.0...500.0.....7.558....5.558..16.5085...660.122.....136
.1900.0...54.29...79.619...200.0...500.0.....7.921....5.646..16.7917...682.491.....135
.1925.0...55.00...80.667...200.0...500.0.....8.238....5.720..17.0326...701.797.....135
.2000.0...57.14...83.810...200.0...500.0.....9.239....5.943..17.7605...761.664.....133
.2100.0...60.00...88.000...200.0...500.0....10.695....6.240..18.7441...846.168.....131
.2200.0...62.86...92.190...200.0...500.0....12.297....6.537..19.7438...936.239.....129
.2267.0...64.78...95.009...200.0...500.0....13.459....6.737..20.4258..1000.071.....128
.2275.0...65.00...95.333...200.0...500.0....13.598....6.760..20.5049..1007.601.....128
.2300.0...65.71...96.381...200.0...500.0....14.051....6.834..20.7608..1032.136.....127
.2400.0...68.57..100.571...200.0...500.0....15.965....7.131..21.7967..1134.148.....125
.2450.0...70.00..102.667...200.0...500.0....16.983....7.280..22.3221..1187.546.....123
.2500.0...71.43..104.762...200.0...500.0....18.044....7.429..22.8529..1242.595.....122
.2567.8...73.37..107.611...200.0...500.0....19.557....7.631..23.5836..1320.192.....120
.2600.0...74.29..108.952...200.0...500.0....20.298....7.726..23.9312..1357.829.....119
.2625.0...75.00..110.000...200.0...500.0....20.889....7.800..24.2045..1387.744.....119
.2700.0...77.14..113.143...200.0...500.0....22.731....8.023..25.0335..1480.248.....117
.2800.0...80.00..117.333...200.0...500.0....25.351....8.320..26.1619..1610.291.....114
.2900.0...82.86..121.524...200.0...500.0....28.166....8.617..27.3187..1748.451.....111
.2975.0...85.00..124.667...200.0...500.0....30.408....8.840..28.2064..1857.730.....109
.3000.0...85.71..125.714...200.0...500.0....31.181....8.914..28.5064..1895.284.....108
.3100.0...88.57..129.905...200.0...500.0....34.404....9.211..29.7279..2051.414.....105
.3150.0...90.00..132.000...200.0...500.0....36.096....9.360..30.3523..2133.182.....104
.3200.0...91.43..134.095...200.0...500.0....37.842....9.509..30.9863..2217.546.....102
.3300.0...94.29..138.286...200.0...500.0....41.502....9.806..32.2854..2394.485.....099
.3325.0...95.00..139.333...200.0...500.0....42.452....9.880..32.6170..2440.513.....098
.3400.0...97.14..142.476...200.0...500.0....45.390...10.103..33.6293..2583.149.....095
.3428.8...97.97..143.691...200.0...500.0....46.561...10.189..34.0280..2640.201.....094
.3500.0..100.00..146.667...200.0...500.0....49.514...10.400..35.0225..2784.590.....092
.3600.0..102.86..150.857...200.0...500.0....53.881...10.697..36.4706..3000.028.....088
.3675.0..105.00..154.000...200.0...500.0....57.319...10.920..37.5963..3171.635.....085
.3700.0..105.71..155.048...200.0...500.0....58.496...10.994..37.9797..3230.879.....084
.3720.5..106.31..155.917...200.0...500.0....59.486...11.056..38.3012..3280.859.....084
.3800.0..108.57..159.238...200.0...500.0....63.369...11.291..39.5573..3478.804.....081
.3850.0..110.00..161.333...200.0...500.0....65.903...11.440..40.3743..3609.770.....079
.3900.0..111.43..163.429...200.0...500.0....68.504...11.589..41.2118..3745.769.....077
.4000.0..114.29..167.619...200.0...500.0....73.910...11.886..42.9537..4034.118.....073
.4025.0..115.00..168.667...200.0...500.0....75.305...11.960..43.4042..4109.865.....072
.4100.0..117.14..171.810...200.0...500.0....79.593...12.183..44.7951..4346.679.....069
.4200.0..120.00..176.000...200.0...500.0....85.560...12.480..46.7513..4686.909.....065
.4235.0..121.00..177.467...200.0...500.0....87.717...12.584..47.4664..4813.289.....063
.4270.0..122.00..178.933...200.0...500.0....89.910...12.688..48.1987..4943.785.....062
.4300.0..122.86..180.190...200.0...500.0....91.818...12.777..48.8408..5059.089.....060
.4305.0..123.00..180.400...200.0...500.0....92.139...12.792..48.9492..5078.627.....060
.4340.0..124.00..181.867...200.0...500.0....94.405...12.896..49.7190..5218.068.....058
.4355.0..124.44..182.506...200.0...500.0....95.403...12.941..50.0607..5280.331.....058
.4375.0..125.00..183.333...200.0...500.0....96.707...13.000..50.5093..5362.381.....057
.4400.0..125.71..184.381...200.0...500.0....98.374...13.074..51.0871..5468.609.....056
.4410.0..126.00..184.800...200.0...500.0....99.047...13.104..51.3214..5511.865.....055
.4445.0..127.00..186.267...200.0...500.0...101.424...13.208..52.1567..5666.848.....054
.4480.0..128.00..187.733...200.0...500.0...103.839...13.312..53.0168..5827.693.....052
.4500.0..128.57..188.571...200.0...500.0...105.235...13.371..53.5201..5922.387.....051
.4515.0..129.00..189.200...200.0...500.0...106.291...13.416..53.9035..5994.797.....051
.4550.0..130.00..190.667...200.0...500.0...108.782...13.520..54.8185..6168.603.....049
.4585.0..131.00..192.133...200.0...500.0...111.312...13.624..55.7642..6349.602.....047
.4600.0..131.43..192.762...200.0...500.0...112.408...13.669..56.1794..6429.508.....047
.4620.0..132.00..193.600...200.0...500.0...113.881...13.728..56.7427..6538.339.....046
.4624.0..132.12..193.778...200.0...500.0...114.195...13.741..56.8639..6561.813.....046
.4655.0..133.00..195.067...200.0...500.0...116.489...13.832..57.7569....1.2756.....044
.4690.0..134.00..196.533...200.0...500.0...119.136...13.936..58.8097....1.3147.....042
.4700.0..134.29..196.952...200.0...500.0...119.900...13.966..59.1180....1.3262.....042
.4725.0..135.00..198.000...200.0...500.0...121.823...14.040..59.9044....1.3556.....041
.4760.0..136.00..199.467...200.0...500.0...124.550...14.144..61.0449....1.3985.....039
.4795.0..137.00..200.933...200.0...500.0...127.318...14.248..62.2355....1.4437.....037
.4800.0..137.14..201.143...200.0...500.0...127.717...14.263..62.4100....1.4503.....037
.4830.0..138.00..202.400...200.0...500.0...130.127...14.352..63.4814....1.4913.....036
.4865.0..139.00..203.867...200.0...500.0...132.976...14.456..64.7884....1.5415.....034
.4900.0..140.00..205.333...200.0...500.0...135.867...14.560..66.1632....1.5948.....032
.4935.0..141.00..206.800...200.0...500.0...138.799...14.664..67.6139....1.6514.....031
.4970.0..142.00..208.267...200.0...500.0...141.773...14.768..69.1500....1.7118.....029
.5000.0..142.86..209.524...200.0...500.0...144.356...14.857..70.5432....1.7669.....027
60.Foot.ET...=.4.9313
330.Foot.ET..=.11.6131
1/8.Mile.ET..=.16.5070
1/8.Mile.MPH.=.52.2679
1000.Foot.ET.=.20.4250
1/4.Mile.ET..=.23.5818
1/4.Mile.MPH.=.73.0000
Try.Using.Rear.Gear.Ratio.=.4.868
1/2.Mile.ET.=.34.027.--.1/2.Mile.MPH.=.97.97
1.KM.ET.=.38.301.--.1.KM.MPH.=.106.31
1.Mile.ET.=.50.059.--.1.Mile.MPH.=.124.44
2.KM.ET.=.56.863.--.2.KM.MPH.=.132.12
Yes, these are instantaneous speeds above the 1/4 mile.
I let the user of my software enter a power loss percentage for each transmission gear and he can also enter a tire grow percentage for each gear. With some drag tires this can make a big difference at high speeds.
How do you handle the difference in HP based on the type of dyno test done?
Steady state test or acceleration rate of xxx RPM /Second each of these will show a different HP for the same engine.
Stan
................Acceleration.and.Top.Speed.Prediction.Chart.
...................................Force....Aero.....Rolling..Elapsed...........Accele
..RPM......MPH...Velocity..Motor.....@.....dynamic...Resist....Time......Total..ration
..................ft/sec..Torque...Wheel..Drag.-.HP....HP......(ET)....Distance.in.G's
....1.0....0.00......000...200.0.....0.0.......000......000.....0000.......000.....000
....1.0....0.03......042...200.0...500.0.......000......003.....0085.......000.....154
....2.0....0.06......084...200.0...500.0.......000......006.....0170.......001.....154
...10.0....0.29......419...200.0...500.0.......000......030.....0848.......018.....154
..100.0....2.86....4.190...200.0...500.0.......001......297.....8477.....1.776.....154
..175.0....5.00....7.333...200.0...500.0.......006......520...1.4838.....5.442.....154
..200.0....5.71....8.381...200.0...500.0.......009......594...1.6959.....7.108.....153
..300.0....8.57...12.571...200.0...500.0.......031......891...2.5453....16.007.....153
..350.0...10.00...14.667...200.0...500.0.......050....1.040...2.9706....21.799.....153
..400.0...11.43...16.762...200.0...500.0.......074....1.189...3.3964....28.490.....153
..500.0...14.29...20.952...200.0...500.0.......144....1.486...4.2497....44.582.....152
..525.0...15.00...22.000...200.0...500.0.......167....1.560...4.4634....49.172.....152
..579.5...16.56...24.294...200.0...500.0.......225....1.723...4.9322....60.023.....152
..600.0...17.14...25.143...200.0...500.0.......249....1.783...5.1058....64.315.....152
..700.0...20.00...29.333...200.0...500.0.......396....2.080...5.9654....87.730.....151
..800.0...22.86...33.524...200.0...500.0.......591....2.377...6.8290...114.873.....150
..875.0...25.00...36.667...200.0...500.0.......774....2.600...7.4798...137.712.....150
..900.0...25.71...37.714...200.0...500.0.......842....2.674...7.6973...145.802.....150
.1000.0...28.57...41.905...200.0...500.0.....1.155....2.971...8.5709...180.580.....149
.1050.0...30.00...44.000...200.0...500.0.....1.337....3.120...9.0098...199.436.....148
.1100.0...31.43...46.095...200.0...500.0.....1.537....3.269...9.4504...219.282.....148
.1200.0...34.29...50.286...200.0...500.0.....1.996....3.566..10.3366...261.990.....146
.1225.0...35.00...51.333...200.0...500.0.....2.123....3.640..10.5593...273.304.....146
.1300.0...37.14...54.476...200.0...500.0.....2.537....3.863..11.2302...308.799.....145
.1342.5...38.36...56.268...200.0...500.0.....2.796....3.990..11.6146...330.086.....145
.1400.0...40.00...58.667...200.0...500.0.....3.169....4.160..12.1319...359.812.....144
.1500.0...42.86...62.857...200.0...500.0.....3.898....4.457..13.0425...415.146.....142
.1575.0...45.00...66.000...200.0...500.0.....4.512....4.680..13.7318...459.560.....141
.1600.0...45.71...67.048...200.0...500.0.....4.730....4.754..13.9629...474.931.....141
.1700.0...48.57...71.238...200.0...500.0.....5.674....5.051..14.8939...539.308.....139
.1750.0...50.00...73.333...200.0...500.0.....6.189....5.200..15.3637...573.268.....138
.1800.0...51.43...75.429...200.0...500.0.....6.735....5.349..15.8365...608.437.....137
.1870.3...53.44...78.383...200.0...500.0.....7.558....5.558..16.5085...660.122.....136
.1900.0...54.29...79.619...200.0...500.0.....7.921....5.646..16.7917...682.491.....135
.1925.0...55.00...80.667...200.0...500.0.....8.238....5.720..17.0326...701.797.....135
.2000.0...57.14...83.810...200.0...500.0.....9.239....5.943..17.7605...761.664.....133
.2100.0...60.00...88.000...200.0...500.0....10.695....6.240..18.7441...846.168.....131
.2200.0...62.86...92.190...200.0...500.0....12.297....6.537..19.7438...936.239.....129
.2267.0...64.78...95.009...200.0...500.0....13.459....6.737..20.4258..1000.071.....128
.2275.0...65.00...95.333...200.0...500.0....13.598....6.760..20.5049..1007.601.....128
.2300.0...65.71...96.381...200.0...500.0....14.051....6.834..20.7608..1032.136.....127
.2400.0...68.57..100.571...200.0...500.0....15.965....7.131..21.7967..1134.148.....125
.2450.0...70.00..102.667...200.0...500.0....16.983....7.280..22.3221..1187.546.....123
.2500.0...71.43..104.762...200.0...500.0....18.044....7.429..22.8529..1242.595.....122
.2567.8...73.37..107.611...200.0...500.0....19.557....7.631..23.5836..1320.192.....120
.2600.0...74.29..108.952...200.0...500.0....20.298....7.726..23.9312..1357.829.....119
.2625.0...75.00..110.000...200.0...500.0....20.889....7.800..24.2045..1387.744.....119
.2700.0...77.14..113.143...200.0...500.0....22.731....8.023..25.0335..1480.248.....117
.2800.0...80.00..117.333...200.0...500.0....25.351....8.320..26.1619..1610.291.....114
.2900.0...82.86..121.524...200.0...500.0....28.166....8.617..27.3187..1748.451.....111
.2975.0...85.00..124.667...200.0...500.0....30.408....8.840..28.2064..1857.730.....109
.3000.0...85.71..125.714...200.0...500.0....31.181....8.914..28.5064..1895.284.....108
.3100.0...88.57..129.905...200.0...500.0....34.404....9.211..29.7279..2051.414.....105
.3150.0...90.00..132.000...200.0...500.0....36.096....9.360..30.3523..2133.182.....104
.3200.0...91.43..134.095...200.0...500.0....37.842....9.509..30.9863..2217.546.....102
.3300.0...94.29..138.286...200.0...500.0....41.502....9.806..32.2854..2394.485.....099
.3325.0...95.00..139.333...200.0...500.0....42.452....9.880..32.6170..2440.513.....098
.3400.0...97.14..142.476...200.0...500.0....45.390...10.103..33.6293..2583.149.....095
.3428.8...97.97..143.691...200.0...500.0....46.561...10.189..34.0280..2640.201.....094
.3500.0..100.00..146.667...200.0...500.0....49.514...10.400..35.0225..2784.590.....092
.3600.0..102.86..150.857...200.0...500.0....53.881...10.697..36.4706..3000.028.....088
.3675.0..105.00..154.000...200.0...500.0....57.319...10.920..37.5963..3171.635.....085
.3700.0..105.71..155.048...200.0...500.0....58.496...10.994..37.9797..3230.879.....084
.3720.5..106.31..155.917...200.0...500.0....59.486...11.056..38.3012..3280.859.....084
.3800.0..108.57..159.238...200.0...500.0....63.369...11.291..39.5573..3478.804.....081
.3850.0..110.00..161.333...200.0...500.0....65.903...11.440..40.3743..3609.770.....079
.3900.0..111.43..163.429...200.0...500.0....68.504...11.589..41.2118..3745.769.....077
.4000.0..114.29..167.619...200.0...500.0....73.910...11.886..42.9537..4034.118.....073
.4025.0..115.00..168.667...200.0...500.0....75.305...11.960..43.4042..4109.865.....072
.4100.0..117.14..171.810...200.0...500.0....79.593...12.183..44.7951..4346.679.....069
.4200.0..120.00..176.000...200.0...500.0....85.560...12.480..46.7513..4686.909.....065
.4235.0..121.00..177.467...200.0...500.0....87.717...12.584..47.4664..4813.289.....063
.4270.0..122.00..178.933...200.0...500.0....89.910...12.688..48.1987..4943.785.....062
.4300.0..122.86..180.190...200.0...500.0....91.818...12.777..48.8408..5059.089.....060
.4305.0..123.00..180.400...200.0...500.0....92.139...12.792..48.9492..5078.627.....060
.4340.0..124.00..181.867...200.0...500.0....94.405...12.896..49.7190..5218.068.....058
.4355.0..124.44..182.506...200.0...500.0....95.403...12.941..50.0607..5280.331.....058
.4375.0..125.00..183.333...200.0...500.0....96.707...13.000..50.5093..5362.381.....057
.4400.0..125.71..184.381...200.0...500.0....98.374...13.074..51.0871..5468.609.....056
.4410.0..126.00..184.800...200.0...500.0....99.047...13.104..51.3214..5511.865.....055
.4445.0..127.00..186.267...200.0...500.0...101.424...13.208..52.1567..5666.848.....054
.4480.0..128.00..187.733...200.0...500.0...103.839...13.312..53.0168..5827.693.....052
.4500.0..128.57..188.571...200.0...500.0...105.235...13.371..53.5201..5922.387.....051
.4515.0..129.00..189.200...200.0...500.0...106.291...13.416..53.9035..5994.797.....051
.4550.0..130.00..190.667...200.0...500.0...108.782...13.520..54.8185..6168.603.....049
.4585.0..131.00..192.133...200.0...500.0...111.312...13.624..55.7642..6349.602.....047
.4600.0..131.43..192.762...200.0...500.0...112.408...13.669..56.1794..6429.508.....047
.4620.0..132.00..193.600...200.0...500.0...113.881...13.728..56.7427..6538.339.....046
.4624.0..132.12..193.778...200.0...500.0...114.195...13.741..56.8639..6561.813.....046
.4655.0..133.00..195.067...200.0...500.0...116.489...13.832..57.7569....1.2756.....044
.4690.0..134.00..196.533...200.0...500.0...119.136...13.936..58.8097....1.3147.....042
.4700.0..134.29..196.952...200.0...500.0...119.900...13.966..59.1180....1.3262.....042
.4725.0..135.00..198.000...200.0...500.0...121.823...14.040..59.9044....1.3556.....041
.4760.0..136.00..199.467...200.0...500.0...124.550...14.144..61.0449....1.3985.....039
.4795.0..137.00..200.933...200.0...500.0...127.318...14.248..62.2355....1.4437.....037
.4800.0..137.14..201.143...200.0...500.0...127.717...14.263..62.4100....1.4503.....037
.4830.0..138.00..202.400...200.0...500.0...130.127...14.352..63.4814....1.4913.....036
.4865.0..139.00..203.867...200.0...500.0...132.976...14.456..64.7884....1.5415.....034
.4900.0..140.00..205.333...200.0...500.0...135.867...14.560..66.1632....1.5948.....032
.4935.0..141.00..206.800...200.0...500.0...138.799...14.664..67.6139....1.6514.....031
.4970.0..142.00..208.267...200.0...500.0...141.773...14.768..69.1500....1.7118.....029
.5000.0..142.86..209.524...200.0...500.0...144.356...14.857..70.5432....1.7669.....027
60.Foot.ET...=.4.9313
330.Foot.ET..=.11.6131
1/8.Mile.ET..=.16.5070
1/8.Mile.MPH.=.52.2679
1000.Foot.ET.=.20.4250
1/4.Mile.ET..=.23.5818
1/4.Mile.MPH.=.73.0000
Try.Using.Rear.Gear.Ratio.=.4.868
1/2.Mile.ET.=.34.027.--.1/2.Mile.MPH.=.97.97
1.KM.ET.=.38.301.--.1.KM.MPH.=.106.31
1.Mile.ET.=.50.059.--.1.Mile.MPH.=.124.44
2.KM.ET.=.56.863.--.2.KM.MPH.=.132.12
Stan Weiss said:
How do you handle the difference in HP based on the type of dyno test done?
Steady state test or acceleration rate of xxx RPM /Second each of these will show a different HP for the same engine.
Only steady state numbers are true bhp as far as I'm concerned. I don't mess about trying to adjust for anything else.Steady state test or acceleration rate of xxx RPM /Second each of these will show a different HP for the same engine.
What about rotational inertia?
Pumaracing said:
I think it's actually 20 yards not feet, at least at the 1/4 mile point and for the particular track I found data for online many years ago. It may well vary with different types of timing equipment and certainly it can't be the average over 20 yards for the 60 foot point or the number would be about half the true speed and therefore meaningless.
Anyway I don't think that's the problem in Stan's calcs because his speeds have proportionally different discrepancies at different distance points. His speed now at 220 yards of 52.31 mph (should be 53.4 mph) appears to be the speed actually pertaining at 210 yards but his speed of 73.02 mph at 440 yards (should be 73.4 mph) is not the true speed for 430 yards, it's actually about the true speed at 435 yards.
Anyway, I'm sure he'll find it.
I've never seen a drag strip give speeds at 60ft, only elapsed time.Anyway I don't think that's the problem in Stan's calcs because his speeds have proportionally different discrepancies at different distance points. His speed now at 220 yards of 52.31 mph (should be 53.4 mph) appears to be the speed actually pertaining at 210 yards but his speed of 73.02 mph at 440 yards (should be 73.4 mph) is not the true speed for 430 yards, it's actually about the true speed at 435 yards.
Anyway, I'm sure he'll find it.
Most drag strips only give trap speeds at 1/8th mile and full 1/4 mile, and pretty sure it is the average over the distance sampled.
Pumaracing said:
Only steady state numbers are true bhp as far as I'm concerned. I don't mess about trying to adjust for anything else.
What about rotational inertia?
Dave,What about rotational inertia?
Maybe it is difference on which side of the pond you are on. None of the engine dyno numbers I get are from a steady state test.
Stan
stevieturbo said:
I've never seen a drag strip give speeds at 60ft, only elapsed time.
Most drag strips only give trap speeds at 1/8th mile and full 1/4 mile, and pretty sure it is the average over the distance sampled.
Stevie,Most drag strips only give trap speeds at 1/8th mile and full 1/4 mile, and pretty sure it is the average over the distance sampled.
I may average my MPH over a different area than Dave.
1/8 mile is 600 ft + 660 ft mph's / 2
1/4 mile is 1290 ft + 1320 ft mph's / 2 -- a decade or two ago I changed this. It used to included 30 feet past the finish line.
Stan
Stan Weiss said:
1/8 mile is 600 ft + 660 ft mph's / 2
1/4 mile is 1290 ft + 1320 ft mph's / 2
OK, good. So as I calculated above, at 210 yards and 435 yards effectively.1/4 mile is 1290 ft + 1320 ft mph's / 2
Despite us no doubt using very different programs and methods we have now agreed the full time and speed curve calculations from a given power curve and vehicle mass without rotational inertia factored in so that's a good start.
If you do ever want to get into inertia calculations I can help with the equations for different gears and the sort of numbers to input for different engine types.
Dave,
Let's stick with the base simulation and add ram air pressure to the scoop based on speed. What does your simulation show?
60 Foot ET = 4.9310
330 Foot ET = 11.6109
1/8 Mile ET = 16.5012
1/8 Mile MPH = 52.3182
1000 Foot ET = 20.4143
1/4 Mile ET = 23.5658
1/4 Mile MPH = 73.1420
1/2 Mile ET = 33.981 -- 1/2 Mile MPH = 98.34
1 KM ET = 38.238 -- 1 KM MPH = 106.79
1 Mile ET = 49.930 -- 1 Mile MPH = 125.29
2 KM ET = 56.684 -- 2 KM MPH = 133.20
3 KM ET = 72.648 -- 3 KM MPH = 145.81
2 Mile ET = 75.982 -- 2 Mile MPH = 147.63
4 KM ET = 87.620 -- 4 KM MPH = 152.37
5 KM ET = 97.732 -- 5 KM MPH = 155.04
3 Mile ET = 99.646 -- 3 Mile MPH = 155.44
6 KM ET = 116.370 -- 6 KM MPH = 157.82
4 Mile ET = 122.558 -- 4 Mile MPH = 158.36
7 KM ET = 130.491 -- 7 KM MPH = 158.89
8 KM ET = 144.542 -- 8 KM MPH = 159.47
5 Mile ET = 145.198 -- 5 Mile MPH = 159.49
9 KM ET = 158.554 -- 9 KM MPH = 159.79
6 Mile ET = 167.735 -- 6 Mile MPH = 159.92
10 KM ET = 172.545 -- 10 KM MPH = 159.97
11 KM ET = 186.524 -- 11 KM MPH = 160.07
7 Mile ET = 190.232 -- 7 Mile MPH = 160.09
12 KM ET = 200.496 -- 12 KM MPH = 160.13
8 Mile ET = 212.715 -- 8 Mile MPH = 160.16
13 KM ET = 214.464 -- 13 KM MPH = 160.16
14 KM ET = 228.430 -- 14 KM MPH = 160.18
9 Mile ET = 235.191 -- 9 Mile MPH = 160.19
15 KM ET = 242.396 -- 15 KM MPH = 160.19
16 KM ET = 256.360 -- 16 KM MPH = 160.19
10 Mile ET = 257.665 -- 10 Mile MPH = 160.19
Stan
Let's stick with the base simulation and add ram air pressure to the scoop based on speed. What does your simulation show?
60 Foot ET = 4.9310
330 Foot ET = 11.6109
1/8 Mile ET = 16.5012
1/8 Mile MPH = 52.3182
1000 Foot ET = 20.4143
1/4 Mile ET = 23.5658
1/4 Mile MPH = 73.1420
1/2 Mile ET = 33.981 -- 1/2 Mile MPH = 98.34
1 KM ET = 38.238 -- 1 KM MPH = 106.79
1 Mile ET = 49.930 -- 1 Mile MPH = 125.29
2 KM ET = 56.684 -- 2 KM MPH = 133.20
3 KM ET = 72.648 -- 3 KM MPH = 145.81
2 Mile ET = 75.982 -- 2 Mile MPH = 147.63
4 KM ET = 87.620 -- 4 KM MPH = 152.37
5 KM ET = 97.732 -- 5 KM MPH = 155.04
3 Mile ET = 99.646 -- 3 Mile MPH = 155.44
6 KM ET = 116.370 -- 6 KM MPH = 157.82
4 Mile ET = 122.558 -- 4 Mile MPH = 158.36
7 KM ET = 130.491 -- 7 KM MPH = 158.89
8 KM ET = 144.542 -- 8 KM MPH = 159.47
5 Mile ET = 145.198 -- 5 Mile MPH = 159.49
9 KM ET = 158.554 -- 9 KM MPH = 159.79
6 Mile ET = 167.735 -- 6 Mile MPH = 159.92
10 KM ET = 172.545 -- 10 KM MPH = 159.97
11 KM ET = 186.524 -- 11 KM MPH = 160.07
7 Mile ET = 190.232 -- 7 Mile MPH = 160.09
12 KM ET = 200.496 -- 12 KM MPH = 160.13
8 Mile ET = 212.715 -- 8 Mile MPH = 160.16
13 KM ET = 214.464 -- 13 KM MPH = 160.16
14 KM ET = 228.430 -- 14 KM MPH = 160.18
9 Mile ET = 235.191 -- 9 Mile MPH = 160.19
15 KM ET = 242.396 -- 15 KM MPH = 160.19
16 KM ET = 256.360 -- 16 KM MPH = 160.19
10 Mile ET = 257.665 -- 10 Mile MPH = 160.19
Stan
Ok, seeing as it was only a five minute job to add a speed squared dependent Bernoulli equation to the torque curve I stuck it in the program to have a look see.
60 Foot ET = 4.93 @ 16.56
330 Foot ET = 11.61 @ 38.38
1/8 Mile ET = 16.50
1/8 Mile MPH = 53.49
1/4 Mile ET = 23.57
1/4 Mile MPH = 73.50
1 Mile ET = 49.94 -- 1 Mile MPH = 125.24
2 Mile ET = 76.00 -- 2 Mile MPH = 147.53
3 Mile ET = 99.68 -- 3 Mile MPH = 155.31
4 Mile ET = 122.60 -- 4 Mile MPH = 158.21
5 Mile ET = 145.25 -- 5 Mile MPH = 159.25
Top speed 160 mph
So yeah, you got the equations right.
60 Foot ET = 4.93 @ 16.56
330 Foot ET = 11.61 @ 38.38
1/8 Mile ET = 16.50
1/8 Mile MPH = 53.49
1/4 Mile ET = 23.57
1/4 Mile MPH = 73.50
1 Mile ET = 49.94 -- 1 Mile MPH = 125.24
2 Mile ET = 76.00 -- 2 Mile MPH = 147.53
3 Mile ET = 99.68 -- 3 Mile MPH = 155.31
4 Mile ET = 122.60 -- 4 Mile MPH = 158.21
5 Mile ET = 145.25 -- 5 Mile MPH = 159.25
Top speed 160 mph
So yeah, you got the equations right.
Dave,
Great. Maybe you help me out then. Over the years I have fine tuned my logic a few times. When using normal air density it is fine. I believe when using lower air densities I any coming up low.
Air Density is 0.076501 @ 160 MPH = 1.0309367 increase
Air Density is 0.060000 @ 160 MPH = 1.0242638 increase - Shouldn't I still get the same 1.0309367 increase?
Thanks,
Stan
Great. Maybe you help me out then. Over the years I have fine tuned my logic a few times. When using normal air density it is fine. I believe when using lower air densities I any coming up low.
Air Density is 0.076501 @ 160 MPH = 1.0309367 increase
Air Density is 0.060000 @ 160 MPH = 1.0242638 increase - Shouldn't I still get the same 1.0309367 increase?
Thanks,
Stan
Gassing Station | Engines & Drivetrain | Top of Page | What's New | My Stuff