Mr2 Drag racing

[mr2trd]

can anyone give instructions as how to perfectly launch an Mr2 turbo in a drag? RPMs, drop clutch or slipping-feathering, etc...

also, best shift point for the Mr2 turbo. i know it's not redline cuz the turbo is only blowing hot air by then...

thanks.

[MRQtwinturbo]

for every car its different....how hard u can launch the car is determined by ur clutch/tires n driver skill...when u shift is determined by ur power and whether or not u can power shift....u just have to keep on practicing and know how to react with your car....i can't wait for my new clutch to go in so i can finally launch the car hard.....rev it up to 4000-4500rpm n let her rip.....i shift at 6500rpms to keep me in a nice power band....

[KAOS]

ahhh ... you want the perfect launch, eh?

1. make sure you're pointed where you want to go
2. give it revs
3. drop the clutch
4. don't lift when you shift
5. keep the turbo on the boil

sounds great, doesn't it? that's utopia though ... like MRQturbo said, it will depend on the car. by your comment about the turbo blwoing hot air at redline, i will assume that you're still running a stock motor and stock turbo - so yes, i shift between 6000 and 6500 RPM. i don't power shift though - but maybe your tranny is in better shape than mine.

[TwiztidxxNinja]

I always thought that powershifting was bad for the tranny. Puts a lot of stress on it. Or has I been mislead?

[Lachean]

Its always highly recommended to NOT powershift an MR2 tranny...

[TwiztidxxNinja]

oh, ok, thats what I thought

[Tom's Mr2]

I know....very ''noobish'' of me asking. But everyone learns sooner or later right? Right!?!

What's powershifting and how is it done? And why is it so bad for your tranny?

Thanks.

[MRQtwinturbo]

its essentially changing gears really quickly.....keeping ur foot on full throttle as you do w/o letting up between shifts.....

[JekylandHyde]

Launching:

http://noshoes.madpowaz.com/tips_tricks.html

[JekylandHyde]

Please feel free to post anything that contradicts the following information. I am merely sharing what my research has found.
Nothing below is written in stone (As far as I know )

Shift point information:

http://www.lingenfelter.com/shiftpoint.asp

http://www.allpar.com/eek/hp-vs-torque.html

http://realbig.com/miata/miata/1995-12/910.html

Using the formula on the third link, my car should be optimally shifted well beyond redline ... and I do shift at redline.

Formula:
Lower gear ratio / higher gear ratio X RPM at peak Torque = Shift RPM

Using the same formula for a stock CT26 MR2, I get shift points:
1st --> 2nd = 6595 rpms
2nd --> 3rd = 5643 rpms
3rd --> 4th = 5595 rpms
4th --> 5th = 4915 rpms

Hope that helps.

Notice how the following both have the peak torque at the same RPM?

276 HP CT26
http://www.turboforum.net/dyno/image...ns/dyno276.jpg

161 HP CT26:
http://www.turboforum.net/dyno/image...redmr2dyno.gif

Same turbo, same shift points :thumb:

[mr24U]

is the redline 7000 ?

[JekylandHyde]

7200 is the stock redline for the MR2T.

[mr24U]

thanks

[JekylandHyde]

Originally posted by Lachean
Its always highly recommended to NOT powershift an MR2 tranny...

I kindly disagree ... at least a little bit.

I just ran back-to-back 11.7s and I completely "flat footed" the 3rd --> 4th shift on both runs. I was 100% throttle while doing that shift. The car did not skip a beat and hte shift was perfect.

I doubt I would try it 2nd --> 3rd because of the forward dogleg action.

I may try it 1st --> 2nd the next time out.

[jebsleo]

Originally posted by JekylandHyde
7200 is the stock redline for the MR2T.

7250 but who's counting.. hehe