Well a freind is running a 04 z71, 5.3 stock accept long tubes and cai. He running a stock tune with a 100 shot, it seems to be hanging up the gears before up shifts. You think this could be due to TQ managment?? I need to figure out how to remove some of his TQ management and also up the line presure. I have HPT

 

yea most likly a tq managment setting..... is the trans stock too?

 

He is running LTs and spray, but never re-tuned for it? I'd say thats part of the problem.......and maybe a hurt transmission too......

 

if he doesnt have a tune then he needs to get one asap if hes going to be spraying that 100 shot.

 

By that do you mean a slow shift?

Did you lower the timing for the spray, if so that will directly affect your shift, cause the computes the delivered TQ by engine timing, and delivered TQ determines your tranny pressure... Strange huh?

You need to lower the desired shift times down to like .3 on the 1->2 and 2->3, next increase the tranny pressure by 2-5%... See how that works for you, you might also try removing ~50-75% of the TQ... Just my .02....

 

Tranny is fine, only does it while spraying. What needs to be changed in the tune? Ive always heard your fine on a stock tune with a 100 shot. Remember our **** has alot less power up here.

 

That's a good bit of advice for 2 cents.

WJ Mark, start there.

 

I was/am running a 125 wet with the stock tuning. I scanned a nitrous run last week and didnt see any knock retard, timing was around 21-22 degrees. I havent had a nitrous run since doing any tuning, but will soon. I raised shift points to 6000 rpm,and have about half of the TM out, shift times are around .225 seconds, and shift pressures are almost maxed out, except for the lower torque sections, i.e. 200 and under. I'm getting a corvette servo, because for the last week, no matter what I do to the tune, the shifts are slow, esp. the 1-2, the 2-3 is pretty good. If your friends shifts are slow only when the nitrous is on, I'd guess there is some slippage going on. Before the tuning, my shiftswere fine nitrous or not. The corvette servo will help, thats what the techs on hptuners forums suggested to do first.

 

Wet or dry? Wet is a bigger problem since the pcm doesn't see the extra air and the torque signal doesn't get higher when the juice is hit. This creates too low of line pressure for that much power and it will cause a slow shift right into the rev limiter. The torque management actually see's the same or less torque to limit because of this. Put a shift kit in there or ramp up the line pressure and shorten the shift times. That should fix it.