silverz28camaro

iTrader: (20)

Well i have a ls2 shortblock in my 2000 z28 auto 3600 vig, 3.73 full bolt-ons.ls6 manifold, ls6 head, torquer v2 cam

Cars first dyno pull was about 394 hp running 120% duty cycle on the stock injectors 28lbs?

we were able to get 403hp at 127% duty cycle but the injectors are clearly maxed out.

I was thinking of going fast 92/92 and a 36lbs injector, question is; will this be enough on the fuel side? Will the 36lbs get me about 80-90% duty cycle with the adition to the fast 92/92?

I have also read on a few threads that once you have a maxed out injector and simply swap to a better one you can see hp gains. My A/F was at about 13.3-13.5 i believe so we may be able to go 12.9-13.1 with the fuel upgrade, this should get me

Slowhawk

iTrader: (12)

If the A/F was holding most of the time the bigger injector will not help HP but it will help the motor from blowing up.
I would go 42's for safety.

silverz28camaro

iTrader: (20)

Do those fuel rails help out as well? They are advertised as high flow, so i was wondering if they were to help with fuel starvation if the injector is to small, or raise a bigger injectors abilities.

DeltaT

iTrader: (5)

You have quite a ways to go before your rails start holding you back, like 300+ more rwhp.

Once your injectors hit 100%, you ain't getting anything more out of them.

The 42's are a great choice.

Jim

silverz28camaro

iTrader: (20)

I was a little worried the 42 may be to big, but if not then i gettin them.

Frans96SS

iTrader: (15)

127% seems a tad high for a 400rwhp car

BLK02WS6

iTrader: (2)

What was the fuel pressure doing on the dyno?? With that setup, I'm sure you need a pump as well. I would do a Racetronix with a hotwire kit and 42# injectors - tune it and be done with it...

Ryan L

Are you using stock IFR values in your tune? Something isn't making sense.

01Z0H6

iTrader: (63)

I am currently running a G5X3, unported LS6's, LS6 intake,pp tb, 30lbSVO's, in my stalled (3600) A4.. Like you, i put down 403/405 to the wheels and the injectors held up fine.These numbers were prior to my freshly built RPM4 tranny.. i actually lost hp/tq 377/387 with the fresh tranny..

Fast Fwd to now...
Tranny is broke in, i am going tomorrow morning to install my FAST 90/90,85mm Maf(delphi), 85mm Lid, re-tune...

I will post the results tomorrow... For me personally, once i upgrade to cnc'd,PP LS6's, i will upgrade to the 42's (green tops) as well as an upgraded FP...

Stay tuned... pardon the pun...