tps % dropping middle of first gear. y??
#1
tps % dropping middle of first gear. y??
Hey i installed a comp cam into the wifes tbss over the weekend. Been tunning idle and got it pretty good. But on the fist wot pull i felt it bog down and thin pick up the top of first. Second and third pull perfect.
I installed a fuel pressure gauge and noticed a 5psi drop from 60psi at the same time and thin pick back up right at redline. So i was thinking maybe fuel pump. Thin looking over logs i see that my tps goes from 85% at wot (i know) to around 50% at the same time and back to 85 at redline.
What are your thoughts? Tb going bad or fuel pump? Im about to order a 340lph to install anyways.
I installed a fuel pressure gauge and noticed a 5psi drop from 60psi at the same time and thin pick back up right at redline. So i was thinking maybe fuel pump. Thin looking over logs i see that my tps goes from 85% at wot (i know) to around 50% at the same time and back to 85 at redline.
What are your thoughts? Tb going bad or fuel pump? Im about to order a 340lph to install anyways.
#3
TECH Veteran
iTrader: (1)
Probably something in torque management tables that you missed. I'm not at all familiar with your specific platform, so there may be some expected airflow issues in a table somewhere that are affected as well, but that is wild speculation. While possible, it is highly unlikely that your possible screwup or a random part failure happened just now. I Would bet on a very minor tuning gremlin.
#4
Yea imma look over all the airflow and tm tables once again. Its only first gear. Im really leaning toward a fuel Pressure problem. Wouldnt the load be higher in first gear? Also tbss guys claim the stock pump is only good to a lil over 400rwhp. Im sure mines over that with this cam change. I just ordered a aem 320lph.
I just hope it keeps up with a 200 hit off the rails. The stock one before cam swap could barely get by with 150 shot.
I just hope it keeps up with a 200 hit off the rails. The stock one before cam swap could barely get by with 150 shot.
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#8
ok update. Made a few pulls tonight checking things. Its only 1st gear. Log shows 50% tps. Afr shows commanded 12.5.
With a 60mph kick down to second its 100% tps and runs perfect with commanded 12.5afr. So its got to be something based off 1st gear only like tms. But ive removed everything. Got me stumped!
With a 60mph kick down to second its 100% tps and runs perfect with commanded 12.5afr. So its got to be something based off 1st gear only like tms. But ive removed everything. Got me stumped!