I have an 94 Z28 with 113k miles on it. Major mods are LE1 heads and cam. I think i'm pushing somewhere around 370. My question is, if i were to run nitrous, how big of a shot could i run without running into fueling limitations? I've heard 125-150 thrown around for stock motors, but i dont know about myself. Thanks

 

that sounds reasonable with a wet shot, are you asking about the pump or the injectors?

 

I don't know why, but in many cases the stock pump just can't keep up. In my case with only 370 rwhp it started going lean in the upper rpms because the pump was on its way out with only 29k original miles on it. The car also died on me a couple of times for no apparent reason. This is also a good example of why you should get your car dyno-tuned after you have a mail order tune for the initial start up. So lets just say because of mine and other examples that have been stated on this site, if you want to be safe, get an aftermarket pump.

 

Same thing for me. around 4800 RPMs I dropped to 22PSI on 30# injectors. Im still waiting to get back on the dyno to see where Im at with the new pump but with the stock pump I could only get 362.

 

Either way, you should replace the intank just due to the amount of mileage on it. Even if its currently keeping up, you wouldn't want it to die out on you.

Ken R.

 

So with a wet shot, all i would need to replace would be the intake fuel pump?

 

Yes

 

Stock fuel pumps should not be considered stock fuel pumps but 10 year old fuel pumps. Wiring going too them is too small and they are designed with stock power in mind. At the flywheel you are already putting out say 50% more than stock, the fact the stock pumps works atall for that is a testamant to it being a good piece, asking it to supply the enough for 100% more power is foolish. You want to run heads/cam/bottle you NEED at least Racetronix wiring upgrade or equivalent and a 255lph pump at least.