How far can a 255+(boost-a-pump)+E85 go?
10-16-2012, 08:31 AM
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How far can a 255+(boost-a-pump)+E85 go? How far do you guys think a Walbro 255 plus a boost-a-pump can go on E85?
Had a dyno session last weekend and fuel pressure dropped pretty severly at around 5000-5500 rpm. Trying to diagnose this since I would have thought it should have been fine up to at least 600rwhp. Final numbers were 550hp/520tq. Wondering if its just not enough pump, or the pump is going bad.
System consists of fuel pump as stated above, stock feed, 97-98 vette rails with the return line, Fuelab boost referenced regulator on the return side, -4 return line back to tank. 60lb injectors.
Had a dyno session last weekend and fuel pressure dropped pretty severly at around 5000-5500 rpm. Trying to diagnose this since I would have thought it should have been fine up to at least 600rwhp. Final numbers were 550hp/520tq. Wondering if its just not enough pump, or the pump is going bad.
System consists of fuel pump as stated above, stock feed, 97-98 vette rails with the return line, Fuelab boost referenced regulator on the return side, -4 return line back to tank. 60lb injectors.
10-19-2012, 02:05 AM
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Boost a pump or not, you don't have enough injector to run that kind of power. If you really think this setup is what you want then I would spend more time looking at power delivery to the pumps. The 255 is too small a pump, your fuel pressure would have to be in the mid 60s, your tuning to catch the BAP has to be spot on- and you would be at the injectors MAX .
Sounds like you are only getting 90% out of your injector-
what PSI is the fuel system ran at / at when or after it drops @5k.
Sounds like you are only getting 90% out of your injector-
what PSI is the fuel system ran at / at when or after it drops @5k.
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10-25-2012, 08:25 AM
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Boost a pump or not, you don't have enough injector to run that kind of power. If you really think this setup is what you want then I would spend more time looking at power delivery to the pumps. The 255 is too small a pump, your fuel pressure would have to be in the mid 60s, your tuning to catch the BAP has to be spot on- and you would be at the injectors MAX .
Sounds like you are only getting 90% out of your injector-
what PSI is the fuel system ran at / at when or after it drops @5k.
Sounds like you are only getting 90% out of your injector-
what PSI is the fuel system ran at / at when or after it drops @5k.
10-26-2012, 07:36 AM
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Injectors will make 600whp on E-85, single pump will fall well short. Get a larger single (DW300) or twins and you will be able to push those injectors farther on a boost referenced setup.
10-28-2012, 06:04 PM
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Im not trying to be rude, but Ive never seen this happen. 600RWHP on E85 would need a boost ref regulator capable of holding 60psi and that would assume that you were actually holding a BSFC of .74 which probably isnt going to happen either, and would need to be a 340 pump with perfect voltage as well.
The 255 is too little pump for most E85 setups running decent HP motor setups. Im not saying you "Cant" make it work", but why run every piece of the system on the theoretical limits.
I put this info here more for the people that read these posts, not as much for the people who respond to them.
