jays98ta

I have a98 trans am with stage 2 heads, 228/228 588/588 Texas speed cam,3500 tci converter,ported throttle body,and 373 gears. Driving on the street it shifts fine, at the track it bounces off the 7000 rpm revlimiter several times before shifting. You have to let off for a while for it to shift. The question is it dieing are in my tune?

jays98ta

anyone?

12secSS

iTrader: (30)

Yup, who ever tuned your car needs to readjust your shift points ... that if it ever was tuned, was it?

jays98ta

The car was tuned by the guy on here who was tuning for free with ls1 edit. The shift points are 6500, and the rev limiter is 7000.

Slacker

I had the same problem, With edit & a 98 you need to use the MPH for adjusting the shift point. Adjusting the RPM didn't help me.

MNR-0

Even though you may command an RPM shift point at WOT at 6500RPM, in real life that may not be happening. You need to log your run and see both the RPM and MPH, plus determine the shift lag, Its a combination of all that must be balanced.

Shifting at high RPM becomes difficult to control due the TQ involved. You need to look at these things:

WOT shift RPM
WOT shift MPH
WOT shift lag (logged)
Shift pressure
TQ management and consequently timing retard

Only track time, patience, logging, reflashing and trial and error will solve this problem for you reliably. Otherwise its just a stab in the dark.

To guide you, heres what I would tackle first:

remove TQ management for the shift
increase line pressure by 10%
keep the shift at 6500RPM
log the MPH at 6500RPM
set the MPH shift at 3MPH less than that logged at 6500MPH
sync the base shift tables at 88/94/100% TPS with the WOT shift tables

Good luck

jays98ta

Thanks for the replies. We are taking it to the track this weekend to try out both suggestions. There are some local guys saying that is what there's was doing before they went out. They said it was the 3/4 clutch pack. Thanks again.