Just as it says. Just curious, I know hey have more fuel pressure than LT1's but will support more power?


TIA.

 

FYI -- fuel pressure has nothing to do with support for more power. You need more flow, which is usually measured in liters per hour (LPH). As long as the pump can maintain positive pressure at the needed flow rate, the actual amount of pressure isn't important.

If your fuel pressure is high, that probably means that you're not using the maximum flow available from your pump.

I think the stock LS1 pump is 150lph, and lots of supercharger kits will come with 200-250lph pumps. I don't have power numbers to match the flow numbers, so I can't help you there.

-Jake

 

I knew that fuel pressure had nothing to do with power, I just knew that LT1s are at like 43psi while LS1 are at like ~55? I will have to get a gauge on it and take it for a little drive........

 

Not exactly true.
You have to take into consideration injector flow rates. Fuel pressure has a direct affect on how much power a fuel injector can support, especially in a forced induction application where you want a boost referenced regulator to add 1 psi additional fuel pressure for each lb of boost. Now, the regulator is what actually maintains the pressure, and as you said, the pump's responsibility is to flow fuel. Indirectly, the fuel pump will have a bearing on how much power can be produced in that the regulator will require x lph to maintain rail pressure at WOT. If the pump can't keep up, you won't produce the power the engine is capable of. There, I think I have muddied the water sufficienly.

 

ok, how about this then......415 rwhp NA motor to 7krpm. Do you think The pump can do it? Believe me, I have NO problem taking the car out with a fuel pressure gauge to "test" it

 

415rwhp...I'd bet the pump could keep up, but the stock injectors will be struggling. But, my theory is if you're going big - do it right. The last thing you'll want is to starve the motor of fuel at 6,000+RPMs. That's when things go click, click, boom!

 

I made 412 rwhp NA with a cam as my only internal mod. Stock injectors, stock fuel pump, etc.

The 98 and 2001-2004 LS1s got 28# injectors, so if you're looking to build-up one of those, it'll be cake. Even on the 99-2000 cars with the smaller injectors, 430 rwhp on the stock injectors and fuel pump wouldn't be a problem.

Mike