I'm not convinced either pump is good to run in a high HP Evo. Until I see more successful testing, I'm staying with the tried and true Double Pumper.

http://midwestevos.com/forums/showthread.php?t=7355

 

i've been on a dw300 for 2 weeks and have put almost 2000 miles on it since install and have had no problems with it. even went on a road trip from phx to la and back in this heat on e85.

i'll be seeing what it can handle when i put a hta green on in a few weeks.

 

I will post as soon as I get some runs in next week. with the DW pump. I am at the edge of the walbro 255 hp with e85 (leans out when engine speed picks up, as well as later in the pull when lbs/min keeps climbing).

Wednesday of next week will be the day for me. I should have it installed by friday night and can show two compareable logs with the same tune on them if you would like as well.

I asked Jayracing if his pump would overrun the stock fpr on an evo 8 and he said that I could definately have that problem at idle, which is one reason I wanted to try the DW pump

 

FLOW CHARTS HERE: https://www.evolutionm.net/forums/au...ml#post9475706

 

We've seen a few issues with the DW pumps in house and all of the issues were either due to installation error or lack of a rewire. We adamantly believe that every application utilizing the DW300 fuel pump needs a rewire, before you toss this pump aside I strongly recommend giving it a shot.

 

ill stick with 044's. nothing worse than being stranded on the side of the road.

 

rewire regardless of power? or just on high power?

 

I think the suggestion is to re-wire the pump regardless of HP. The power that is being referred to in this thread, is the amount of Amperage that the pump uses ans how much more energy it requires over a stock pump or Walboro even.

 

Won't it overrun the stock fpr if its re-wired though? So, if you're going to rewire it, when do you need to get a afpr, etc? Or how would you tune around this?

 

in my case, im not looking to overpower a walbro at this point, just match it and give a solid base to stock injectors, and possibly 1000s if i get e85 here anytime soon, as im running stock turbo.

that is my worry also, and a few of the thoughts making it difficult to pick a pump.

 

so a rewire, new FPR , and return line to run an aftermarket pump correctly? sheesh why not just sell all that as a kit..

 

Thats what you have to remember when doing the hardwire, that you'll probably need an afpr if youre running bigger than a wally 255, unless you can tune around it, but thats not the "right" way to go about it.

The other option would be to use a double pumper setup, and have the second pump come on a "x"psi so you're only running one pump at idle/cruise. But I don't think this is the place for that discussion

I'm running 32lbs on my FP Green HTA, 1350cc injectors, stock fuel lines, stock base pressure, etc. I am running out of pump with my setup on my wally 255hp, and I should have the DW here tomorrow. Im going to see how it does without a rewire and go form there.

 

My update:

Replaced my Walbro 255hp with the DW301 pump. Went lean in the same spots (spoolup with high load, then evens out as boost drops, then goes lean again when the lbs/min keeps climbing). This is how it was meant to be...dropped in, no rewire.

This was on my evo 8, HTA green, Comp 280's.

Log shows 32psi, 53lbs/min, 19 degrees of timing. This is all on E85 of course.

I want to rewire it today, but I want to know if I'm going to have to buy a fpr or not in order to run this pump? If that's the case, theres really no reason to not jump from a walbro to a double pumper and run the stock fpr.

 

Alright, I just re-wired my pump, and that made a hell of a difference. I kept the same tune, TOOK OUT 10% of fuel, had to mess wth the deadtimes of the injectors a little bit (pretty sure Im getting fpr overrun), but instead of it dipping down sometimes into the 11.5-ish afr's its not pegged at 10:1 afr.

Ill post more tomorrow on my findings

Josh

 

I had a DW300 pump and it screwed me I dont recomend it to anyone.