Thread: Dual Walbro Set Ups?

Just wondering if anyone has a dual walboro set up on their car. I am thinking one in the sump and another inline. Any info on this would be great. Pics would be wonderful.

I don't personally, but I have seen quite a few Hondas run them. My understanding of it was that dual pumps were better in terms of buffering the fuel pressure requirements, to ensure that you don't lean out while running something like a 1200cc injector?

What are you working on, Rob?

For single, I was going with the Bosch 044 Fuel Pump.

flows better than a walbro

Still my VE-T build. Just mapping out what I want to do with the fuel system.

If your planning to be over the 600whp range i would just maybe do a modification to the pickup and take out the in tank, Bore the holes out and put some 8an fittings, some simple measurements can take care of making the modifications necessary then run an inline pump with some new larger line.

Im still running my 2 1/2 year old intank walbro 255 and it more than keeps up with the power im making. Even on 28psi of boost roughly 550whp it keeps the fuel pressure up where its supposed to be without falling. A/F is nice and steady where i want it. I guess if i were to go with any larger of turbo and injectors and even more power i would have to upgrade and ditch the stock rail as the inlet for it seems just too small for that power range.

Im guessing your going with topfeed injectors Rob?

Ashton I will be running Nismo 740's. I am shooting for 500 whp or so. I know the walboro 255L intank will be ok but, I am trying to make this my final build for this car. I have a lot invested into it so I want to make sure things are bullet proof. Some may call it overkill but, I am covering everything.

No messing around this time. 100% reliable, quality built 500 whp pump gas car.

Aside from the usual dual pump problems (doubling your chances of a failure and failures being potentially catastrophic) the dual in-line pump configuration works very well. I'm not sure how much extra capacity dual Walbro 255 HP pumps can support but a good estimate is 30-50% higher flow rate and sustained pressure than a single Walbro 255 HP. (It might be more like 80-90% though).

Most BMW e30's came with a dual series pump design which can support 400 WHP in a pinch.

If you're considering dual pumps in parallel you get about 100% increase in flow rate but no gain in sustained pressure.

Sorry I don't have any direct experience to help you out with.

Now that I see what you're trying to accomplish, the Bosch 044 pump (either in tank or in-line) would be the best bet. However, a dual Walbro setup would work too, and even going with the stock in-tank pump plus one Walbro in-line would work just fine too.

Most use a Walbro intank as a lifter pump, surge tank mounted to keep fuel always present, and then another Bosch 044 pump.

Big horsepower, look into dual Bosch 044 pumps, sump the fuel tank and run -10an lines and -6an return into the tank. Or just run a single Aeromotive pump A1000 will do the job nicely. Its a little louder than the Bosch and Walbros.

He's not looking to make that much power. =]

Surge tank and all that is a good idea though if you're serious about racing with that power.

The return line from the fuel rail should always be the same size as the feed line. A stagger setup is not advised unless you know exactly what you're doing. Better to let the FPR do it's job.

Aeromotive pumps are great for some people but the noise is obviously a problem and they are not for daily driven cars. I hear they are not designed to run for long times and have overheating issues on street cars.