todds69

iTrader: (2)

put my car on the dyno for the first time today. and it only made 364 hp and went way lean at 5500 rpm's.its a 98 z28 with tea 5.3 stg 1.5 heads ls6 intake and an mti b1 cam(221 221,559 559,on a 114).it has headers and all your other average bs too.its got a mail order tune from mti,and its never been on a dyno untill today.from what i've read on here i think it might be maxing out the injectors (they are stock).i have no way to check the duty cycle,it was on a friend of mines dyno and he deals mostly with carburated stuff.what do you guys think? i'm kinda new to the whole fuel injected tuning thing.

code4

iTrader: (30)

Is your car an auto? I never trust dynos with auto cars. If it's an auto it is very possible that you are putting out more than 364. If 364 is your true horsepower it's a little low to be maxing out your injectors.

I did 415 rwhp on my friends stock fuel system at 90% duty cycle.

I would change your fuel filter.

todds69

iTrader: (2)

nope its a 6 speed.i figured it should put down around 400,and i'm sure it could do better with a dyno tune.it'll be back onn the dyno this weekend with a fuel pressure guage on it,i also changed the fuel filter today.if the fuel pressure dosen't drop when it goes lean i would say its probably the injectors.what do ya'll think?

MeentSS02

iTrader: (11)

The fuel pressure gauge is your next step in this journey, so your thinking is correct IMO. If it drops more than a couple psi at WOT, then that is probably a lot of your problem. If you don't feel like fixing the pressure drop, you can just drop in larger injectors and tune for them to make up the difference.