I wanted to create this thread because, this question kind of gets overlooked in the rest of the Walbro 400 threads...

I already have the walbro 255 and bosch 044 installed with the ID 1000s. I just ordered the Walbro 400... Im think about removing the 044 altogether because I like the simplicity of just one pump, but would the walbro 400 alone support 700-750 on the ID 1000s? Or should I leave the Bosch 044 in?

Also what are some thoughts on running 2 unmatched pumps in parallel (Bosch 044 and Walbro 400).

 

Do you have a sheet that tells you how much the walbro flows at each level of fuel pressure?

If you're wanting to make more power I'm assuming you're going to want to run your fuel pressure fairly high (around 100psi base) in order to get the most out of the injectors. The problem you'll run into when running two pumps inline with each other may not flow enough at your desired fuel pressure.

What fuel do you plan on using?

 

I think there really wont be an issue with running 2 unmatched pumps in parallel, other than the overall output.

 

Will be using C16...

I get what you're saying now. Depends on if the single walbro can sustain the higher pressures.

Let me take a look at the sheet and Ill post it up in a bit

EDIT: I think Im gonna have to leave the Bosch 044 inline...

 

WALBRO 400LPH


WALBRO 255 and BOSCH 044

 

Upgrade your intank pump to the new Walbro.

Sell your bosch 1000's and upgrade to 1600's or 2000's. Then you will have enough injector to support your pumps. Shouldn't have a problem making 800whp with this setup (walbro 400 + bosch 044 line).

 

How about the aeromotive 340lph paired with the 044? im planing on nitrous and boost with my fic900cc(e85 looking for 500whp on spray)..My understanding is that the pressure relief on the walbro opens up around 90psi ,and i might need a higher base to get the most out of the injectors. Id like to have consistant fuel pressure while on nitrous without the big dip in fuel pressure.

 

sorry , dont mean to threadjack .. but with the OPs original setup ( walbro 255 with a bosch 044 inline and ID 1000 cc injectors ) , how much can that fuel setup support when used with E85 ?

 

The intank pump is acting as the lift pump & is supply only a few feet of fuel. When the second pump has,steady pressure on its incoming side its actually more effective. Diesels do it with fuel & turbos lol. A very important factor is your return line size in order to maintain volume that assists in jeeping pressure where u want it. If duel wont flow thru & return then both the pumps strughle to keep fuel moved

 

so far i have not hear any good reviews on the 400lph or if it is a true 400lph.

 

If your goal is 750hp, you really should look at a larger injector.

The base pressure you'd have to run to make a 1000cc injector flow enough is hard on the fuel system, especially the fuel pumps. And, you really don't gain anything from running such a high base fuel pressure and then throwing more fuel pressure on top of that to compensate for boost.

For your power goals, you should look at least toward a 1400cc injector or larger. Then you can turn the base fuel pressure down, and you don't have to use such an extreme fuel pump system to get the fuel you need to the injectors.

 

So with the new Walbro 400 fuel pump all you need is one 044 to make 750+whp? I have ID 2000's and will be using c16

 

I think I will upgrade to the ID2000's this winter. Anyone want some practically new ID1000's to buy? LOL.

And to add to what CDecker is asking... With the ID2000's, would it be more efficient to to run the Walbro 400 and 044 in serial or parallel since extremely high base pressure is not needed...

I guess it wont even matter, because one walbro 400 and ID2000's should bank 750 right? (on c16 that is)

 

True, but since these pump came out there hasn't been any good reviews yet. It's a fake
400lph pump

 

its brand new. it took a little while for the aeromotive pump to be reviewed. why dont you buy one and review it since youre so intent on it being "a fake 400lph pump"

 

i was also considering swapping out the 255 for the walbro400 and running the 044 inline... anyone happen too try this yet? just unsure if fuel would bottleneck between the 2 pumps .... curious if it's been done with good results yet

 

I have been running the walbro pump for years... its far from new.

They work well, I have tested them side by side with the deatchwerks 340lph pumps and they have kept up easily at 75psi of fuel pressure. I have had tons of issues keeping the walbros (the 400lph, havent fried a 255 in e85 yet) happy in E85, so I switched everything I have over to mk4 TT supra pumps or deatchwerks pumps.

I have a dual intank deatchwerks setup right now, and it is working great with 6 1000cc injectors... It would probably work great for 6 1600cc injectors through the stock -6 line in my drag car.

If you are going to run C16.. I would probably stick to a dual 255 or your current 044/255 combo on the 1000cc injectors... It would give you some room to go bigger base pressure and not require much fiddling around. You could still make about 700-750whp on c16 and 1000cc injectors with a bit more pressure I believe, and you could do it out of the 044/255 combo.