95Z06/Z28

Right now my car has slp y-pipe, k&n fipk, ported and gutted mass air, cat removed, flowmaster, 3.73 gears,and a madz28 programed computer on its way. I just added a NOS brand 150 dry shot kit with a walbro 255 fuel pump and i was wandering if my car would run 13.4 or 13.5 on motor, What should it run on nos if i hit it as soon as i shift to second?? Blows the tires off in 1st. Its a 95 z28 a4.

Derrick Redd

I'd say mid 12's. The sooner you start spraying the more ET you will drop. I hope your not running stock injectors with that 150 dry shot. I prefer the wet kits myself.

95Z06/Z28

Yea, i still have stock injectors. Ive only had the car 6 weeks and it was bone stock when i bought it so i'm trying to get a lot done in small period of time. I have added a walbro 255 fuel pump though.

matt104a

doesn't matter how big of a fuel pump you have, those stock injectors will only pump so much fuel. better run a lower shot until you can get bigger injectors

Derrick Redd

That is exactly why I said I hope your not running stock injectors. Stock injectors tend to lock up at high fuel pressures, like with using a 150 dry shot. I'd get some 24# SVO's at least. Remember nitrous + lean fuel mixture =

95Z06/Z28

What size are the stock injectors? If i am going to replace them i would like to get a little bigger ones to make sure it can handle future upgrades.

Derrick Redd

Stock is 24#. The 24# SVO's don't tend to lock up like the stock 24# do, so that might be an option. If you plan on future upgrades such as heads, cam, etc. I'd get 30#. I have the 30# SVO's. Remember you will have to change the injector constant in the PCM if you go to a higher # injector.