Fuel pump questions

[Murlo26]

I am running the wally 400 e85 version right now, i guess its called the 450. It's hardwired right now to battery voltage.

I am currently around 650whp and I am out of injector right now. I am going with 2150's soon I think to solve that and hopefully I can get my fueling under control. If I run out of fuel still after this then I will simply run a BAP.

[4seasons69]

I just read on 3 different boards people were achieving 700+ with 255 Wally's in parallel. So I'd try your pumps first. Then go from there.


My car already put down 760ish awhp at map with these pumps, 1650cc injectors and the base fuel pressure at 54psi. I now have 2150s and the fuel pressure down to 40psi so that should help. But how much more do these pumps have in them? I've read a lot of threads saying one wally 255 can support 450-500 on e85 so in theory 2 should do 900 to 1000.if that's the case these should be enough.



I am running the wally 400 e85 version right now, i guess its called the 450. It's hardwired right now to battery voltage.

I am currently around 650whp and I am out of injector right now. I am going with 2150's soon I think to solve that and hopefully I can get my fueling under control. If I run out of fuel still after this then I will simply run a BAP.

Okay thanks! That's good to know.

Now what I would like to know if anyone can answer can you run one pump that is larger and one that is smaller when the pumps are set up in parallel?

[scheides]

From what I've heard the dw300 doesn't flow much more than the 255hp. Also I believe Scheides is running the 400 not the 450 or at least he was with little to no issues. He can chime in though.


The only thing the DW300 is good for over the W255 is that it is quieter. It might flow an extra 3% but nothing spectacular.

Yes I am indeed running the w400 non-e85 version (wasn't out yet when I bought mine). It's pumping e85 and I'm running it with a BAP at full voltage. Have probably 10k miles on it over the last year.


Good to know about the dw300. I've seen threads where the 450 was maxing out around 650whp but either way it does flow much more than the pumps I have. My main concern with the walbro 400 is I'm running dual pumps I don't want one to go out because of the e85 and then boom goes my new engine lol.

Do you know if scheides is running dual 400s? Otherwise hopefully he will chime In

Single.

I am running the wally 400 e85 version right now, i guess its called the 450. It's hardwired right now to battery voltage.



This is a pretty good example of a nice simple evoX setup. You'll get further with it on a 1G since the X's have a fuel tax of some sort.

OP, I'd say don't run mismatched pumps in your hanger, you're right--the 400 will overcome the smaller pump and maybe even burn it out. Still, IIRC on touley's car (evoIX) they ran it with dual modded 255's and a single BAP and I *think* the BAP only bumped the voltage on one of the pumps.

So you only have dual 255's right now? Have you popped the relief valves? Considered a BAP as mentioned above? Otherwise get two of the W450's (since they make an e85 version now, don't bother with the non-e85 version, just my opinion) and see if they fit.

[4seasons69]

OP, I'd say don't run mismatched pumps in your hanger, you're right--the 400 will overcome the smaller pump and maybe even burn it out. Still, IIRC on touley's car (evoIX) they ran it with dual modded 255's and a single BAP and I *think* the BAP only bumped the voltage on one of the pumps.

So you only have dual 255's right now? Have you popped the relief valves? Considered a BAP as mentioned above? Otherwise get two of the W450's (since they make an e85 version now, don't bother with the non-e85 version, just my opinion) and see if they fit.

Okay cool. Mismatched pumps is out. My pumps are the pumps out of a Ford GT. The Ford GT pumps are walbro pumps that are supposed to flow a little better than a wally 255. I will look into seeing if you can pop the relief valves on these pumps. Two 450s should fit but at $440 for two I would probably just go with a twin pump bap

[goodhart]

I say just do the relief valves and twin BAP.

[4seasons69]

It's sounding like that might be the best route to go

[4seasons69]

Okay problem solved! Thanks for the help guys! I called kenne bell and they said with the way my pumps are wired in i can run the 40amp single pump version but to put it before the relay.