Fuel Pumps & Fueling
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TECH Resident
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From: NC - Charlotte area
Fuel Pumps & Fueling About fuel pumps & proceeding from a Wiring kit & Racetronix 255 Liters
per Hour pump; what is there?
I have been told that the 340/350 Walbro pump is no more flow than the
255..actually that the 255 is the same thing.
There is the option with TWIN 255 IN-TANK pumps & a Hobbs switch to
turn the second one on. (The DIY method)
I also know that Lonnies Performance sells an entire kit for dual
pumps.
Is there a single pump solution w/o going outside the tank??
per Hour pump; what is there?
I have been told that the 340/350 Walbro pump is no more flow than the
255..actually that the 255 is the same thing.
There is the option with TWIN 255 IN-TANK pumps & a Hobbs switch to
turn the second one on. (The DIY method)
I also know that Lonnies Performance sells an entire kit for dual
pumps.
Is there a single pump solution w/o going outside the tank??
For how much power? The replacement 255 pump is the biggest pump available for a direct replacement for the cars. It is good to about 550-600rwhp. Our Dual pump setup are the most reliable street setup available. Built in your fuel bucket the pumps are wired and installed for a factory fit and function. Complete wire harness to operate the pumps individually so one runs all the time and the second kicks on under boost with the supplied Hobbs switch. With the full kit it is 100% reliable to 1000+rwhp.
Thread Starter
TECH Resident
iTrader: (17)
Joined: Sep 2004
Posts: 3,747
Likes: 0
From: NC - Charlotte area
For how much power? The replacement 255 pump is the biggest pump available for a direct replacement for the cars. It is good to about 550-600rwhp. Our Dual pump setup are the most reliable street setup available. Built in your fuel bucket the pumps are wired and installed for a factory fit and function. Complete wire harness to operate the pumps individually so one runs all the time and the second kicks on under boost with the supplied Hobbs switch. With the full kit it is 100% reliable to 1000+rwhp.
I will look into it. I plan on making some upgrades this christmas.
so why is there a 340 pump? is the curve any different than a 255?...gonna check that
That system should be more then adaquit for what you are doing.Maybe you have a weak pump.You could flow it and see if it is up to specs.You could also add a BAP.Other then that you woulld have to move up to twin pumps.
Hope this helps.
Hope this helps.
Joined: Mar 2002
Posts: 2,032
Likes: 26
From: A Racetronix dealer near you...
my single 255 pump is not carrying me right now...going from ~58psi idle & part throttle all the way down to 50psi load & WOT. I don't know my exact power, but 42# injectors @43.5psi (3 bar) and 8.5lbs of boost & 88% duty cycle, lol. guessing ~500rwhp+.
I will look into it. I plan on making some upgrades this christmas.
so why is there a 340 pump? is the curve any different than a 255?...gonna check that
I will look into it. I plan on making some upgrades this christmas.
so why is there a 340 pump? is the curve any different than a 255?...gonna check that
If you are running 42's @ 58PSI @ 88% DC they will flow apx. 215L/Hr of fuel. The single in-tank pumps are only rated at apx. 220LPH not including plumbing restrictions, jet pump operation etc. You are over the edge.
You should consider a dual in-tank system!!!
__________________
Manufacturer / Distributor of Automotive Fuel Systems, Components & Electronics
Please support a Racetronix dealer near you for personalized service.
>WEB SITE<
Manufacturer / Distributor of Automotive Fuel Systems, Components & Electronics
Please support a Racetronix dealer near you for personalized service.
>WEB SITE<
If you want a complete dual pump kit, please give me a call.
We use only Racetronix components for an OEM quality install. These kits are fully assembled & tested, with a complete wiring harness.
For those looking for a trouble free & ready to run solution with no fabrication required, we have what you need.
We use only Racetronix components for an OEM quality install. These kits are fully assembled & tested, with a complete wiring harness.
For those looking for a trouble free & ready to run solution with no fabrication required, we have what you need.
What has not been mentioned, but should be brought up, includes the following:
Horsepower support for NA engines will be higher than for FI due to the higher BSFC of a FI engine.
A higher boosted engine should really be running a boost referenced FPR. If you are running 8 pounds of boost, they should add 8 pounds of pressure under full boost. That may help you in the short run.
The ratings for any particular pump is based on a curve, The Walbro 340 is part of a series of Walbro pumps, called their high pressure pumps. IIRC, they include the GSS340, 341 & 342. Most likely, all have the same electric innards, but differ in the input and output configurations. All are rated to flow 255lph, but will flow at different rates at 3 bar, 4 bar, and even higher pressures. There are curves plotted for different 255lph pumps at different pressures, JFGI.
Also, there is a Bosch 040 in-tank fuel pump that claims to output 300lph. Not sure if anyone has run that one with success, or how much of an improvement it might be. Plus, it is a "universal fit" meaning some mods will most likely be required.
Horsepower support for NA engines will be higher than for FI due to the higher BSFC of a FI engine.
A higher boosted engine should really be running a boost referenced FPR. If you are running 8 pounds of boost, they should add 8 pounds of pressure under full boost. That may help you in the short run.
The ratings for any particular pump is based on a curve, The Walbro 340 is part of a series of Walbro pumps, called their high pressure pumps. IIRC, they include the GSS340, 341 & 342. Most likely, all have the same electric innards, but differ in the input and output configurations. All are rated to flow 255lph, but will flow at different rates at 3 bar, 4 bar, and even higher pressures. There are curves plotted for different 255lph pumps at different pressures, JFGI.
Also, there is a Bosch 040 in-tank fuel pump that claims to output 300lph. Not sure if anyone has run that one with success, or how much of an improvement it might be. Plus, it is a "universal fit" meaning some mods will most likely be required.
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