R&D

I'm starting to collect parts to mod my 2008 Z06. Since I will be doing the heads anyway, I thought I might as well do a BTR3 cam, MSD intake, headers, etc. I suspect I will probably end up close to 600 rwhp if so. One thing I don't know is how far the factory fuel system in these cars will go. Does anyone know how many N/A RWHP the stock fuel pump and injectors will make before they are marginal?

Racingswh

Stock pump, 65 lb Deatchwerks injectors, 617 rwhp.

The thought was even if stock injectors could get away with it they would be at the very top of their duty cycle most of the time. I road race the car and the goal is to be at wide open throttle as often as possible so we played it safe.

I got a couple different opinions and they seemed to agree on those injectors would work fine for the power level and the use. So far so good.

I forgot to add I am using 93 octane pump gas.

double06

As long as you are using pump gas you should be OK. On your pump it free flows like 255 liters and hour at like 58 psi according to the Racetronix website. Assuming 3.8 liters per gallon and 6.2 pounds of fuel per gallon you are talking 415 pounds of fuel. Assuming a .5 BSFC you are talking about 830 motor hp. Based on most of the builds 700 motor hp I see in magazines is about where they fall into. Now there may be some flow loss as a result of the entire corvette fuel system but I could also say the .5 BSFC maybe a little high on this NA motors. The stock injector are probably good till like somewhere in the mid 500 hp area but I think once you get to 600 they seem to change over. Injectors 50-60 pounds should be fine since there are 8 (also assumes a 90% max flow rate). I see a lot of cars with power you are talking about using the factory pump. Now E85 that's another issue.

AzDave47

With stock injectors I was getting 90% duty cycle at 575 rwhp (uncorrected) at 1200' and 94* test temps. (SAE SM 5 at 602). I usually do events at elevation so would be OK with the stock injectors, but at 45* and near sea level I would have been short, so had ID 720s installed.

freddyvette

Same experience. I am at 95% at ~600rwhp. My tuner had to dial back the timing since we didn't want to go above 95% by adding more fuel. I have just bought some 660cc FIC's and will be tuning it as soon as I figure out why my power steering pump blew out all the fluid.