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3.4 or 3.5 with headers

04lss

04lss

New member
Im ready to order my pulley, and im trying to determine if I should order a 3.5 or 3.4.
Its a 2002 GTP with a gen 3. At this point everything is stock except the open cone.
I am installing Speed daddy headers, autolite 104 plugs, maybe a tstat, I have an open cone intake,.
The car has 0 KR now at stock. It is also not my daily driver, its my play toy.


I thought before I spend the money id get some input.
 


By lowering the size of the pulley, you increase your cylinder air temps a lot. Since winter is nearly on us.. you can get lulled by the cooler air keeping you running semi knock free after that pulley swap. But.. when summer comes..you might meet Chip.. Scott did, and I kinda told him the same this time last year.
 


BillBoost37 said:
By lowering the size of the pulley, you increase your cylinder air temps a lot. Since winter is nearly on us.. you can get lulled by the cooler air keeping you running semi knock free after that pulley swap. But.. when summer comes..you might meet Chip.. Scott did, and I kinda told him the same this time last year.
Click to expand...

you sure did, and you were also 100% right. but i was re tuning as the temps rose. then the FUEL PUMP TOOK A CRAP! i was done tuning when it popped on me. it was kr free.
 
its all i can come up with. as it died soon after. and my fuel trims went up after the new pump. i say that 233,000 mile pump ran its course and died on me.
 


So i just re-scanned the car, scanning app wasnt working right the first time.
Found out average KR is .5, peaking at 4 at the shift. Am i still safe to do the 3.5 and headers colder plugs and the tstat
 
yes, your stock as far as i can tell.

headers should kill all your kr, the pulley may add some but you should have a tune for it, to get the most out of it safely.
 


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