how much horsepower can a walbro fuel pump support? i've heard some get 500 horse power. anyone pulled more with a 255 walbro pump?

 

yes u could achieve 500 with it fine probably. There are probably many other threads about this, i know i can remember it being covered other times also. In those people have said they made 600 with that pump.

 

I made 580hp with bigger lines from the fuel filter.

 

some say 550 is the ceiling, some say you can squeak out 600. if i remember i was around 82-85% duty? maybe a little more last year 540whp with a walbro -6 lines from the filter and 1200's. 52 psi base i think. hell it has been so long he hee.

 

535AWHP (dynojet) on stock lines stock return system 1000cc Precision injectors and AEM EMS.

2.0L Evolution.

 

ive seen a few 600whp B-series on here with 1000's stock lines and the walbro..

im currently at 500whp with walbro, stock lines and the 1000's... im goin for more, so ill tell you...

its no set number, it depends on the setup i guess

 

659whp on stock lines and 1000's h22 t67.
p.s going to turn it down to be safe its not worth a motor..

 

ok great guys. looks like i won't have to get an aeromotive pump then.

 

Best thing to do with maxing the pump is to not let the pressure increase much. IIRC its something like 60psi where you actually lose overall flow, based on flow vs pressure. Higher pressures can also burn the pump out faster, and a fump failure = motor failure when over 500whp...

 

all the people who are running these pumps i have two questions
1. dont most fuel injectors get burnt out at over 55psi ?
2. what's your duty cycle when making 500whp an more ?
i've been wanting to get one of these but i've never used them on a honda. i've always seen the A1000 to be better

 

I usually cut them off around 600-620whp.

 

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Awesome info.

 

The limit was right at 500 hp w/ a B18c on our Dyno Dynamics (550+ dynojet) at 13.5 volts measured at the pump with the car running.

If you need just a little more you can always wire the pump direct to the alternator with a relay. Voltage has a lot to do with fuel flow with fuel pumps, more voltage means more fuel pressure. You'll know when your at the end of your pump or lines when fuel pressure starts to drop at high RPM/boost.

... Remember, max HP with a fuel pump also depends on the BSFC of your engine.(how thirsty your engine is per ft./lb of tq.)