How to Launch an Auto Tranny

Myxalplyx · #1 10-20-2007, 05:19 PM

Not sure if anyone shared this. I talked to Chike briefly about this and we launch autos differently. If you have a technique that is different than mine, please feel free to share it. This is only on how to launch an autotrannied car from a stop, to get the fastest acceleration (That I use).

At the starting line,

1) Keep your foot on the brake pedal,

2) Put the transmission into Neutral,

3) Press the gas pedal once and let off (Rev quickly to about 4-5k rpm). ***At this point, you should feel the gas pedal sink to the floor***, If the pedal does not sink to the floor, do not proceed. Your car will begin moving in step #5.

4) Put the transmission into drive (You are still holding the brake pedal to the floor while the other foot was already taken off the gas pedal),

5) Floor the gas pedal (Your car will not move). You should reach your stall speed.

6) Release the brake pedal while flooring the gas pedal (Neck may snap back). DO NOT hold the gas pedal while braking for any longer than 5 seconds. Tranny heats up!

Disclaimer: I do not recommend doing this without a tranny cooler even if I have done it myself multiple times. Also, do not repeat this again without allowing your transmission to cool down after a run.

I just wanted to get this out since I thought most people did it this way. Good luck and share your findings!

Evil One · #2 10-20-2007, 05:25 PM

Thats the way I do it.

Jim

TomsSVX · #3 10-20-2007, 05:37 PM

revving it in neutral allows the brake booster to get filled up with vaccum as the engine revs down. Good technique

Tom

Hondasucks · #4 10-20-2007, 05:41 PM

A friend of mine has a 55 Chevy truck that he drags, he tried launching like that and launching by just planting the gas when the light turned green, and he actually got a quicker 60' time than by holding the brake... I dunno though, might be different on a scoob...

Trevor · #5 10-20-2007, 06:08 PM

Quote:

Originally Posted by Hondasucks

A friend of mine has a 55 Chevy truck that he drags, he tried launching like that and launching by just planting the gas when the light turned green, and he actually got a quicker 60' time than by holding the brake... I dunno though, might be different on a scoob...

In doing this he probably eliminated some wheel spin, one of the most important aspects involved.

I speak on the basis of experience with grid starts in circuit racing. Whatever technique is used, the driver's prime object is to eliminate wasted power and ensure that the maximum is applied towards forward motion. Controlled wheel spin can be effectively used in lieu of clutch slip, when driving a gearbox equipped car so as to prevent the engine bogging down, but surely wheel spin must be absolutely detrimental in the case of an automatic.