Hello All,

I have a Walbro 255LPH intank pump currently, this works out to be 67 GPH. General rule of thumb is 10HP per gal. My car currently has 450-475 crank, so 45-50 GPH is my current fuel demand. If I were to put 125 shot on my motor, this would another 12 GPH demand... putting this real close to the full demand of the walbro 255 intank pump. Am I missing something here, as far as, capability @ a lower PSI than the 255LPH is actually rated for flow? Would I be ok or should I add a stand alone fuel tank/pump?

Thank you!

 

It should be ok. Flow varies with pressure. I ran a 255 at 40 psi witha 383 that was around 475 hp maybe 500 and a 150 shot. Was fine

 

To feel better about this, would anyone know the GPH for 255LPH @ 60PSI down to what it would be at 6-7 PSI?

 

A little off topic but I'll ask how quick was that car?
That was one iteration of your street-style IROC wasn't it?

 

they flow 60-61 gph at 60 psi 13.5 volts

at 40 psi its 70.

at 20 psi its 80 gph

at free flow 0 psi its closer to 86-88

 

11.47 at 119 all motor in the heat. Never ran in cold air. Nitrous it went 10.63 at almost 127. 4th or 5th pass on the bottle. Was trapping 128 on fresh bottle but i wasnt spraying off the hit. Went 1.41 and 1.45 60’s with the nitrous hitting at wot immediately, no delay

 

This is basically my stretch goal. That and 140 MPH at the Sandhills Open Road Challenge.

 

same here! im looking for an 11.99999 at around 118 mph on my N/A setup before I start to configure my nitrous setup.

 

I've had the horsepower to do it but I've always compromised on the chassis and gearing. In a more drag race orientated package, 400 CHP should be more than enough (even at 3600 lbs). But always traction limited (except in the earlier iterations of the 350) and never enough RPM at the stripe. I'd be 1000-1500 RPM below peak at the top end. The current plan still isn't going to address the lack of gearing or the weight transfer but it IS going to address the need for more power. I figure with 50-75 additional HP and fresh slicks, the gearing will come into it's own.

 

cool. what rear gear ratio are ya running? I went with a 3.55 since my car is a multipurpose street/strip/autox/show/cruise car. if it were just strictly a drag car, I might have went with different rear gear ratio. Mine weighs 3,430 pounds without me in it, so, plus 190 lbs of me, somehow I hope to get to an 11.99 with the 531 crank hp I have and 3600 converter in a probuilt 700r4


anyways, back to the GPH topic for the OP, i think a 25 would be good for you, but why not just go with a 340 pump ?