OctaneZ28

iTrader: (6)

Since the converter install (Vig3200) I've been launching the car at about 2500rpms. Stall it up, mash the go pedal. Good results.

I've since changed to 3.42 gears (from 2.73s) and since then, the 2 times I've been to the track, if I stalled it up anything past about 2000rpm the car would roll forward. So I haven't been able to launch the car to its full potential.

Is this a suspension setup problem?
I'd like to get back to launching at 2500rpm.

Currently running BMR SFCs, BMR tubular LCAs with relocation brackets (attached at bottom hole), Stock PHR, Stock torque arm.

I already have boxed LCAs and PHR to put on the car, and am planning on upgrading to a Spohn chassis-mount torque arm.

Would this help the situation?

I was thinking too that maybe the trans was a little hot....but couldn't have hardly been the case
I don't have a trans temp gauge, but I never hot-lap more than 4 consecutive runs, and rarely more than 3 runs.
The weather at these track visits was quite cool, so trans temp probably wasn't an issue.

Anyway, I appreciate any advice.

Bitemark46

I don't think it has anything to do with your suspension. 2.73's have less of a torque multiplier so that's why you were able to stall it up higher. Now with 3.42's it has given you more torque down low thus needing less rpm to move the car. Hence the lower stall speed of 2k. Try start off on a ten speed bike in 10th gear. Takes alot of energy to get moving now put it in 1st gear and you'll use 90% less energy to move the same mass. Same concept with your gears. Hope this helps. -Mark

OctaneZ28

iTrader: (6)

Hmm, good point, never thought of that.

dug

iTrader: (10)

I think thats the whole purpose of a transbrake. To allow you to stall up the converter without moving.

Ed Wright

iTrader: (1)

Your car would probably be quicker if you didnt try to stall it as high. Try 1800 to 2000. Might be surprised.

Good luck, Ed

zspot98

iTrader: (87)

^ Ed is 100% right. I have always run better times stalling my 3600 to about 1700 rpm and then going. A buddy of mine has a 4200 stall and he doesn't stall his up to 2500 and cuts 1.5 60' times. Just my .02

SilverGhost

iTrader: (53)

tim its the gear. the more gear you have the less rpm you can footbrake in laymans terms.

putting more gear in the car you shouldn't need to be footbraking that thing to the moon anymore, part of the point of putting more gear. you made a change and now you'll have to play with it but i would start by flashing the converter from various rpm's and see what creates the best results.