RE: PH goes drag racing
Discussion
The leaf is consistent because the motor controller is directly controlling motor torque!
It hasn't got enough power at low speed (due to a lack of gears) to wheel spin, and the rate at which the initial torque is applied is also controlled (very precisely) by the positive torque ramp rate in its motor controller, so in effect the work done after the accel pedal is mashed to the floor is very very repeatable.
And, as long as you don't brake (just lift) after the run, you get back around 70% of the energy you just expended, so the battery isn't going to go flat that quickly either!
It hasn't got enough power at low speed (due to a lack of gears) to wheel spin, and the rate at which the initial torque is applied is also controlled (very precisely) by the positive torque ramp rate in its motor controller, so in effect the work done after the accel pedal is mashed to the floor is very very repeatable.
And, as long as you don't brake (just lift) after the run, you get back around 70% of the energy you just expended, so the battery isn't going to go flat that quickly either!
Max_Torque said:
The leaf is consistent because the motor controller is directly controlling motor torque!
It hasn't got enough power at low speed (due to a lack of gears) to wheel spin, and the rate at which the initial torque is applied is also controlled (very precisely) by the positive torque ramp rate in its motor controller, so in effect the work done after the accel pedal is mashed to the floor is very very repeatable.
And, as long as you don't brake (just lift) after the run, you get back around 70% of the energy you just expended, so the battery isn't going to go flat that quickly either!
Agreed but of course drag racing isn't just about the car, it's about the nut behind the wheel and a fair bit of luck too. It hasn't got enough power at low speed (due to a lack of gears) to wheel spin, and the rate at which the initial torque is applied is also controlled (very precisely) by the positive torque ramp rate in its motor controller, so in effect the work done after the accel pedal is mashed to the floor is very very repeatable.
And, as long as you don't brake (just lift) after the run, you get back around 70% of the energy you just expended, so the battery isn't going to go flat that quickly either!
Just out of interest, and before everyone comments on the fact the Leaf won Sportsman ET, has anyone bothered to read the data on each round of eliminations and qualifying before passing any further judgement?
When you have, let me know what you think ;-)
http://www.eurodragstereventcoverage.com/santapod/...
When you have, let me know what you think ;-)
http://www.eurodragstereventcoverage.com/santapod/...
*KT said:
Just out of interest, and before everyone comments on the fact the Leaf won Sportsman ET, has anyone bothered to read the data on each round of eliminations and qualifying before passing any further judgement?
When you have, let me know what you think ;-)
http://www.eurodragstereventcoverage.com/santapod/...
Spot on KT....yes the leaf won but wasn't number 1 qualifier, didn't get closest to their dial in (think that was me being 0.007 seconds off..while on the brakes...almost broke out!!!) and won the final with a lesser breakout. When you have, let me know what you think ;-)
http://www.eurodragstereventcoverage.com/santapod/...
While the results make it look as though the leafs win was easy...it was anything but. But the guys judged it well. The conditions changed over the 3 days and made a big difference to us all (even in my mini it was 4 tenths)...shocked me how much the wind made a difference, especially for the smaller cars.
http://eurodragster.com/timing/2017festivalofpower...
This is the interesting one for me. Take a look at the win margins closest race was 189mm, average win time of 0.18 seconds and closest to dial in was 0.007 seconds, you can't afford to make a mistake. Gill should have stuck to her dial in that she'd been running all day...wouldn't have broken out in the final and took home the silverware!
This is the interesting one for me. Take a look at the win margins closest race was 189mm, average win time of 0.18 seconds and closest to dial in was 0.007 seconds, you can't afford to make a mistake. Gill should have stuck to her dial in that she'd been running all day...wouldn't have broken out in the final and took home the silverware!
It just shows how wrong the idea of something with little power and very controlled torque application being easy to bracket race is.
Looking at Steve's full passes in the Leaf they ranged anywhere from 17.65 to 17.79 (a 0.14 window). Compare this with our skating around on the edge of adhesion runs which were from 7.74 to 7.82 (a 0.08 window). Steve qualified number 2 in his class with 0.025 over dial-in. We were 0.003 over for our number 1. Before anyone thinks that is a fluke, our last event we were number 1 with 0.001 over. Last year we qualified in the 0.00x's 3 times and only at one event all year we finished qualifying at over 0.02x. We have around 1000hp and nothing at all which actively controls the application of torque. The Leaf may be good, but there's a lot more to bracket racing than controlled torque application!
Looking at Steve's full passes in the Leaf they ranged anywhere from 17.65 to 17.79 (a 0.14 window). Compare this with our skating around on the edge of adhesion runs which were from 7.74 to 7.82 (a 0.08 window). Steve qualified number 2 in his class with 0.025 over dial-in. We were 0.003 over for our number 1. Before anyone thinks that is a fluke, our last event we were number 1 with 0.001 over. Last year we qualified in the 0.00x's 3 times and only at one event all year we finished qualifying at over 0.02x. We have around 1000hp and nothing at all which actively controls the application of torque. The Leaf may be good, but there's a lot more to bracket racing than controlled torque application!
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