Best launch RPM fro max acceleration

[jogi730]

I have read various theories regading this topic and thought I would open it up for what I hope will be interesting discussion.
So what would be:

1) THe optimum theoretical RPM for launch for 1/4 mile?
2) The optimum practical RPM for launch for 1/4 mile?
3) Differences (and method) for a diesel if any?
4) Differences for an automatic and best practice?

[speeding-g60]

i dunno about 3 and 4, but 1 and 2 are about the same.

i launch @ 6800 rpm on a launch control, making ~15 psi (~1BAR) of boost.

there is no set in stone launch rpm. it takes into consideration a number of factors.

vehicle weight.
suspension action.
traction.
WHP curve of motor.
gearing.
how the motor operates in the rpm ranges, max rpm's, etc.
and many more.

we tried launching @ 6k rpm, no good.
we tried dumping the clutch, it leaped off the ground.

we are @ 6800 and slipping out of the hole for 1.46 60' best, and 1.51 - 1.59 fairly often.

my launch control is all automated. if the wheels are not moving, i am on my lower limiter, we pull timing to load the motor and build boost. when the tires start turning past 5kph, then it raises the limiter to redline (9200) and then the programmed ramp rate for boost is applied and each gear has its own settings for ramp and rate.

sorry i couldnt help you more, but every car will have a different set rpm. what works for me may not work for you. it takes time to figure out, thats what is known as "track tuning", figuring out the finer parts of drag racing.

and this is how i launch coming out of the hole, the car wants to lift the front right wheel off the ground!!!!!

[Rusty]

Stock car is about 4k-4k5 RPM but you have to balance the clutch for a fraction to stop it bogging down. In the wet you can be much more aggressive and get a little slip, in the dry it's a little harsh. More power and less weight should help a little here.

Diesel is all about managing the large torque and small rev band. Automatic can be held on the brakes but not recommended!

[Big Lee M]

I've done a 5500rpm launch,boy do they move then. I would not do it at Santa Pod or on a propper drag strip as i think it would kill the box or cv's. I'd say a 500rpm launch should see good movement. A few people i know have sen me do it and said it went like s h i t off a shovel.......

[speeding-g60]

oh yeah, and my car does 0-60 mph in 2.45 seconds, as well.

[JP]

Pretty much as speeding G60 says all down to the weight of the car and power curve coupled with gear ratios and traction. Personally I've tried various launches at the pod. If I dump the clutch at 6500-6800 it bounces of the limiter at 7650 in first, If I dump it at 5000rpm it bogs down. Currently I find on my car somewhere between 5800-6200 slipping the clutch ever so slightly for a consistant 1.8-1.85 60ft on street tires with no burnout.

As for traction don't seem to have an issue with that at the pod.