Standing start 1/4 mile times in an Ultima

[pilbeam_mp62]

Standard G50/03 gearbox
Road tyres
Say, approx 550 HP engine.

What 1/4 mile time do you think the car is capable of, and what do you estimate terminal speed ?

Thanks very much

Regards

[LuckyP]

I'll kick off with a 11.6s @ 121mph way, way back. Never got the power down and spent the first few runs toasting my clutch. I would have thought with a slightly different technique I could have got 11 @ 130mph - but it was a std G50 box with an A/S 550bhp.

http://www.pistonheads.tv/clip1022

[V8Dom]

Power to Weight: 517 bhp/ton
0-60: 3.4
0-100: 6.8
60-100: 3.4
1/4 Mile ET: 11.24
1/4 Mile Terminal: 129
Dragstrip 1/4 Mile ET: 11.04
Dragstrip 1/4 Mile Terminal: 133

1080kg inc driver and fluids, 550 hp at flywheel

the difference between dragstrip time and road time is traction off the line

95% accurate terminals depends on gearing, time is dependant on horsepower

Dom

Edited by V8Dom on Wednesday 17th March 18:45

[pilbeam_mp62]

Thanks Pete.

Thanks Dom - very comprehensive.

Regards

[andygtt]

A real 550bhp in the car shoud see high 10's if geared right.

But if it an AS engine with the ultima headers it will be sub 500bhp and I think the 03 is too low geared so you will loose half second changing gear.
I'd suggest 11.3s @ 129mph

[Mjpmark]

Guys, can i ask what calculations your using for the figures?

Or are they factual results.?

If they are calculated can you give me an idea of

fuel injected ls3 700hp - g50/52. 2" headers.

[Captain Slog]

Mjpmark said:

Guys, can i ask what calculations your using for the figures?

Or are they factual results.?

If they are calculated can you give me an idea of

fuel injected ls3 700hp - g50/52. 2" headers.

I think Dom ( V8Dom) is your man for that, he has produced a software emulator for producing/predicting speed results, and its free too if you PM him

Steve

[V8Dom]

Mjpmark said:

Guys, can i ask what calculations your using for the figures?

Or are they factual results.?

If they are calculated can you give me an idea of

fuel injected ls3 700hp - g50/52. 2" headers.

ill run it through my program when i get home..

i can even work out for you the horsepower needed to do a certain time..

just confirm canam or gtr because there is a weight difference... and if you have an exact weight that would be even better..

Dom

[Mjpmark]

Thanks Dom

Its a GTR, not sure on exact weight so its a guestimate im afraid.

[738 driver]

1450 kg with all yer gadgets Mark !

[Mjpmark]

hahah god i hope not. may need 850hp then!!!!!!

[V8Dom]

Mjpmark said:

Guys, can i ask what calculations your using for the figures?

Or are they factual results.?

If they are calculated can you give me an idea of

fuel injected ls3 700hp - g50/52. 2" headers.

here you go ... this is at 1080kg.....if you want more or less weight let me know..

Power to Weight: 659 bhp/ton
0-60: 3.2
0-100: 5.7
60-100: 2.5
1/4 Mile ET: 10.57
1/4 Mile Terminal: 140
Dragstrip 1/4 Mile ET: 10.37
Dragstrip 1/4 Mile Terminal: 144


dom

[V8Dom]

Mjpmark said:

hahah god i hope not. may need 850hp then!!!!!!

850 hp??????????

ye ha your in the 9's!!!!!!!!!!!!!!!!!!!!!!!!!!

Power to Weight: 800 bhp/ton
0-60: 2.9
0-100: 5.1
60-100: 2.2
1/4 Mile ET: 10.06
1/4 Mile Terminal: 149
Dragstrip 1/4 Mile ET: 9.86
Dragstrip 1/4 Mile Terminal: 153


dom

[mohrt]

Didn't they do 9.9s @ 143mph with the AS 720?

[Gulf LS3]

V8Dom said:

Mjpmark said:

hahah god i hope not. may need 850hp then!!!!!!

850 hp??????????

ye ha your in the 9's!!!!!!!!!!!!!!!!!!!!!!!!!!

Power to Weight: 800 bhp/ton
0-60: 2.9
0-100: 5.1
60-100: 2.2
1/4 Mile ET: 10.06
1/4 Mile Terminal: 149
Dragstrip 1/4 Mile ET: 9.86
Dragstrip 1/4 Mile Terminal: 153


dom

i think these figures are a bit slow Dom, but i suppose it all depends on hookup!
I know Can Am Dave has seen 0-100(GPS measured) in less than 5 in his beast, i think we should see a bit lower ET and higher terminal but you know more about it than i do

[jschwartz]

With a real 600 hp engine I ran 10.86 at 133 mph.
With 500 hp I ran 11.38@124 normal street tires in a GTR

[V8Dom]

Gulf LS3 said:

V8Dom said:

Mjpmark said:

hahah god i hope not. may need 850hp then!!!!!!

850 hp??????????

ye ha your in the 9's!!!!!!!!!!!!!!!!!!!!!!!!!!

Power to Weight: 800 bhp/ton
0-60: 2.9
0-100: 5.1
60-100: 2.2
1/4 Mile ET: 10.06
1/4 Mile Terminal: 149
Dragstrip 1/4 Mile ET: 9.86
Dragstrip 1/4 Mile Terminal: 153


dom

i think these figures are a bit slow Dom, but i suppose it all depends on hookup!
I know Can Am Dave has seen 0-100(GPS measured) in less than 5 in his beast, i think we should see a bit lower ET and higher terminal but you know more about it than i do

Kyle you are right as a computer can only calculate acceleration with horsepower v weight as a reference and can not predict how a car is launched off the line and a drivers ability to slip the clutch. As stated above there is also a 5% accuracy involved as every car is different.

Time gained at the start line is crucial to a good time(not terminal) and when I raced bikes, engines with the same horsepower as mine were averaging 1/2 a second slower in the 1/4 mile than me due to my start line technique.(my engine produced 193hp and ran a best 9.03's and averaged 9.06's once dialed in, street tyres, no electronics etc etc)

Using the revs and slipping the clutch will help reduce wheel spin due to your control with the clutch (on a bike also controls the wheelie too)but will also burn it. ....I used to replace the complete clutch every weekend on my bike due to it being a normal clutch, but all the guys with lockup clutches ran them most of the season without changing the friction plates, but they could not manually control the slip every run due to the clutch locking up after a certain revs...

I ran this 'old hat' system because of money(cheaper to replace the clutch as I got them free) and more importantly every run is different and as an engine gets hot the biteing point is always different(i even converted back to cable rather than hydraulic as heat effected the slave cylinder bite!!) The result shocked everyone and i even was accused of cheating as no one understood what i was doing..It bagged me 3 British championships (with old hat design and when i blew a motor and they even confirmed its legality). But that was 20 years ago and things and development has changed!!!!!!

What im trying to say is if you want the best 1/4 time in the world it will cost you either in technology or wearing parts, but if you want to know roughly what time you will get, an old program ive used gives you a rough idea without going to the track..

Dom

Edited by V8Dom on Saturday 20th March 12:15