I've done alot of reading on this subject, and have debated back and forth onto whether to do a dual pump setup. I'm curious to see with real world experience how much power people are making on a single walbro. Post up your whp numbers, what pump, injector size, injector duty cycles, etc, etc.

 

About 430bhp, 1,2bar boost, 4x 850cc injectors, about 85% max duty cycle.

Walbro 255.

 

I've heard of alot of people running out of pump around that hp level. anymore experience?

 

485rwh with 2x850cc and 2x1200cc with pump wired directly to battery voltage.
Walbro 255hp # 342.
At this point I was already seeing a slight pressure drop of 2-4psi @ higher rpm.
At 450-460rwh fuel pressure was rock solid steady.

I've seen this pumps make 580-620rwh on turbo B18/B20 Hondas.

JD

 

459 at the wheels on pump gas at 18lbs boost
550 primary 1600 secondaries. Walbro 255 with both fuel rails fed in parallel.

-Trent

 

run the duals

it will save alot of hassle in the long run

 

if you are really concerned just get a Bosch 044 pump

 

The question shouldn't be "How much power have you made on a single walbro?". Single walbro pumps will only flow up to around 500rwhp safely. So the question should be something like "How much power do you plan to make?". If you plan on making over 500rwhp, then a dual pump(or a Boost-a-Pump) is what you should run; end of story. Unless you want to run one pump for simplicity and for fear of another pump going bad and you not knowing. If that's the case, then you need to get a better single pump than a walbro. Aeromotive makes some really nice pumps. Expensive, but well worth it.

My experience is that my car made 439rwhp @ 15psi on a single walbro, 1000cc primaries & 1600cc secondaries, duty cycle between 50-60%, GT40R turbo on a streetport. And I'm looking at quite a bit more power than that now, so I'm going for 2 Walbros.

Hope all this info helps.

Dee E.

 

what is the bosch 044 good for power wise?

looking for a decent intank pump that can handle more then the walbro.

kevin.

 

I'll sell you my rx7.com fuel pump. I used it about 2 years with no problems. Actually to be honest I've only put about 4k miles on it in 2 years, lol. Anyways it flows more than walbro to be sure. You can check it out on www.rx7.com . I even have a brand new fuel sock on it. they sell for $264 new I'll sell it to you for 100 bucks plus shipping. Let me know