Fuel pump output and max injector size

[Soldier_GN]

Hey Guys,
Im doing some head and roller cam work on the GN, finally. Wanted to upgrade my injectors, currently running 42.5# injectors. I have a Walbro 255 in the tank and was wondering if that fuel pump would support 80# injectors at 25-28 PSI?

1 Gallon = 3.785 liters
255 LPH Fuel Pump divided by 3.785 Lieters = 67.31 gallons

Now How do i add a conversion or factor in the 80# injectors and 25-28 PSI

Will my Walbro 255 work with these 80# injectors or will have to upgrade the pump too???

 

[Eticket]

There is more than a few variables at play as the fuel pump flows diferently at didn't pressures.

http://autoperformanceengineering.com/html/fpspecs.html
You need to consider your base vs actual fuel pressure...if your base fuel pressure is 43.5, then at 25psi, the fuel pressure is 78.5 - then go find a chart that shows the 255 lph pump output at this pressure. but then you're still not done.

how much HP are you trying to push at 25psi? psi is just a figure and isn't an indicator of power by itself.

Putting all of this aside, looking at your combo, you may want to consider 60lb injectors unless you plan on a bigger turbo later on. 60lbers can get you to mid 10's, then you'll need more for faster.

 

[pacecarta]

y

 

[Soldier_GN]

Awesome...so i can run the 80# but in the future when i upgrade my turbo i will need to upgrade the fp...

Only reason i wana make the change is because my 42# were running at 95% duty cycle...so im good for the time being...thanks guys

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