WHP limits of Walbro 255

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May 18, 2006, 09:12 AM

#16

Ted B

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Quote:

Originally Posted by kjewer1

Assuming fuel specific gravity of .724 (sunoco 117), target AFR of 12:1, and boost of 30 psi and base of 43 psi, the 255 LP supports 57 lbs/min, and the 255HP supports 68 lbs/min. The 35r will do ~65 lbs/min for most poeple. The HP version should do much better.

AFAIK, the high pressure (HP) version is the default 255lph pump sold by EVO parts vendors.

Quote:

Originally Posted by kjewer1

You can use a 255 as a lift pump to feed a Aeromotive A1000 or similar, but there are some funny things that go on. Fine for a WOT race car, but idle and cruise will cause some starvation of the A1000 and shorten it's life (people already have trouble getting that pump to last in street cars). One or two 255s feeding a low pressure swirl pot might keep a A1000 fed, but no one I know has tried this either.

I wasn't aware of this problem. If it is indeed a concern, it's may be worthwhile to remember that the EVO has a dual voltage pump circuit. One could conceivably wire the Aeromotive pump such that it is fed the two different voltages as is the in-tank pump, as opposed to being wired constantly 'wide open'. Or, one could wire the in-tank pump to remain constantly at high-voltage, and throttle the Aeromotive pump with the factory dual voltage system.

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May 18, 2006, 10:27 AM

#17

kjewer1

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That is certainly an option. With DSMlink disabling that circuit I often forget about it. Aeromotive also makes thier own pump controller made just for this purpose, but IIRC, it's about 200 bucks. But another option none the less.