niceguy

RBeyer... those are some nice heads. Will make great power with a blower especially with good port work!!! I figured that the 2.5 was a typo.

But I do have to agree with GPM on the fp. I run that much fp on my turbo alcohol car with 35-39lbs of boost.

RBeyer

It really does not run that fat. That is what the Aeromotive fuel pressure regulator takes it to.
I have tried two different regulators and tested at the rail and the gauge same results. This is my concern I think we are at the end of these nozzles for this appliction as I think we are forcing fuel thru them.
Bob

GPM

I run Fast EFI, I was told injectors are rated at 43.5 psi, you need roughly .5 lb per HP. Running high pressure would act like a bigger injector. There is a calculation for what you are doing. I believe you can find it on Kinsler Fuel Injection. Without knowing the duty cycle at top end there is no way of telling how close you are to static.

niceguy

I always say, have more injector than you need, within reason. I'll try to find HP ratings for injectors. I'd say you are real close to 800hp if not a tad more.

RBeyer

Builder says 825 to 850.
Bob

niceguy

Found this info on FAST's website. Looks like you need bigger injectors IMHO.

Supercharged v8 peak power:

55lb/hr = 660hp
60lb/hr = 720hp
65lb/hr = 780hp
83lb/hr = 996hp

This comes with this note:
NOTE: fuel injectors in and of themselves do nothing to produce power, so don’t choose a larger injector because of the peak HP rating of the injector –too large of an injector will only waste fuel and hurt your throttle response, much like overcarbureting a non-injected engine-. Select the right injector to support the power that your engine produces -you’ll never run out of fuel, and you’ll experience great throttle response, a smooth power curve, and good fuel economy.

RBeyer

Wnat is the base and peak fuel pressure in this application?

niceguy

Like GPM stated, I think the base is 45psi to start. I run 48psi on my car as a base, but I also run alcohol and the fp boost ratio is 1:1. So with 30lbs of boost, I have almost 80psi. But mine is also a turbo, but boost is boost right?

niceguy

Here is the FAST site.... it might help.

http://www.fuelairspark.com/Products...ection_468.asp

GPM

Base 45, adding 1psi of fuel for 1 lb of boost.