I was wondering on a NOS dry kit if I am wanting to spay 125-150 on a '02 what kind of fuel pressure at the end of the fuel rail would I need at wide open throttle to feed that big of a shot? And will the stock injectors keep up with that much N2O?

 

Well...its a dry kit. So really your not doing anything to the fuel system. You should see a stock rating of 58 psi at the fuel rail at idle or normal driving. Under heavy acceletaion you may see a quick dip in pressure maybe a psi or two and then return to a steady 58 psi. Under WOT with nitrous and say ...a 100 shot. You may see a dip to about 52 psi and then a constant 55 psi or so. The fuel system will attempt to keep pressure constant and adjust flow as necasarry. You really dont want to "jack up" fuel pressure or it will run rich on motor. I would only worry about this with very large shots.

 

I was asking how much to make sure the stock pump will keep up with the 125-150 shot,I was wanting to make sure I didn't lean it out. What
do you call a large shot?

<small>[ August 09, 2002, 10:28 AM: Message edited by: JohnPayne ]</small>

 

Well...unless youve modified your fuel system you arent going to be able to change your fuel pressure anyways. Basically all you do is put in either an intank (prefered) or inline pump. That will ensure enough fuel for (intank) for approz 575+ hp. You FP will only be elevated slighlty at idle and part throttle. Maybe 60-62 instead of 58 psi.

 

Thanks for the help.You answered my ?

 

Your '02 will safely run a 125 shot, 150 should be okay too, just be sure to watch your AFR. With an injector upgrade (all else staying close to stock) 175-200 may be possible, but I wouldn't without ramping up slowly and watching AFR very closely.