Walbro 255
Ok get this i only have a cam and a ported tb and 100 shot. I took the car to go get it tuned for a 150 and they said i need racetronix fuel pump to go with my walbro. IMO i think runnin h/c intake is almost like runnin 100 or 150 shot. I think those guys were full of **** or something.
My personal car is on a stock pump with a big cam 150 shot and it holds up just fine. The walbro unit should be sufficient for your application... The racetronix unit is a solid piece 2.
Schwanke sounds like he also has a great alternative....
Schwanke sounds like he also has a great alternative....
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Ok get this i only have a cam and a ported tb and 100 shot. I took the car to go get it tuned for a 150 and they said i need racetronix fuel pump to go with my walbro. IMO i think runnin h/c intake is almost like runnin 100 or 150 shot. I think those guys were full of **** or something.
The Walbro 255 high pressure (the model 340 and 342) will support 700 hp (crank) no prob if the car is properly tuned. It also respond very well to voltage increases. This is a good write-up and test of the Walbro and other popular pumps that people use.
http://www.roadraceengineering.com/f...pflowrates.htm
UPDATE: I forgot one thing, when using a Walbro pump in-tank with a constant voltage... for longevity it is SUPER important that the Walbro is 50% or more emersed in fuel at all times. They do heat up. If the the tank is ran down close to empty (on most applictions) and the pump doesnt have the fuel level high enough to keep it cool, they can heat up and seize. I ran dual Walbros in my Supra and I have a single Walbro in my TA now... and just to be safe I never let the car get below a 1/8 of a tank of gas.
http://www.roadraceengineering.com/f...pflowrates.htm
UPDATE: I forgot one thing, when using a Walbro pump in-tank with a constant voltage... for longevity it is SUPER important that the Walbro is 50% or more emersed in fuel at all times. They do heat up. If the the tank is ran down close to empty (on most applictions) and the pump doesnt have the fuel level high enough to keep it cool, they can heat up and seize. I ran dual Walbros in my Supra and I have a single Walbro in my TA now... and just to be safe I never let the car get below a 1/8 of a tank of gas. Last edited by Goldfinger911; Jan 17, 2008 at 12:48 PM.
It is not that hard to figure it out what a pump will support. People usually include a 20% safety margin for heat, wear and other factors. Sometimes more. You can use:
Fuel Pump Size in LPH = 1.2*(3.7854118 *(Crank HP * BSFC factor *(1 / Fuel Weight )))
(Typical premium fuel weighs 6.35 lbs per gallon)
So...
1.2 * (3.7854118 * (700 * .50 * (1 / 6.35 ))) = 250.37 lph
If you are using a Boost-a-pump (like I do) you can just adjust your safety margin accordingly. Read the link I posted above. It gives the Walbro's flow rates at both 12 volts and 14 volts.
Fuel Pump Size in LPH = 1.2*(3.7854118 *(Crank HP * BSFC factor *(1 / Fuel Weight )))
(Typical premium fuel weighs 6.35 lbs per gallon)
So...
1.2 * (3.7854118 * (700 * .50 * (1 / 6.35 ))) = 250.37 lph
If you are using a Boost-a-pump (like I do) you can just adjust your safety margin accordingly. Read the link I posted above. It gives the Walbro's flow rates at both 12 volts and 14 volts.
ok i got a question right now i have the the racetronix kit with plug n play kit, now im going to be around 600-650hp would you upgrade to something else? and could i like use the racetronix kit but swap out the fuel pump somehow?
