scheides

iTrader: (10)

Just found this, great info mrfred! I had a similar experience, the DW301 didn't flow quite what I was expecting. I ended up installing a BAP and it has been rock solid.

mrfred

iTrader: (50)

Glad you like it. Just got back from vacation with family. Hope to have a rewire done by late this afternoon. I'm ready to be done fooling round with fuel pumps and get onto tuning.

mrfred

iTrader: (50)

First post updated with the first of my fuel pump testin with a fuel pump rewire.

killerpenguin21

iTrader: (20)

so what power level are you having these issues at?

i will be running 380-400whp (hopefully), using fic 1100's with possible/occasional e85 use. i had my hopes up that i could use the dw pump as a drop in due to how loud my previous walbros have been in other cars.

but this is starting to make me question that...

awesome info/testing as usual.

mrfred

iTrader: (50)

Glad you like the testing. A single Walbro 255 on factory pump wiring is good for about 470 whp DJ.

killerpenguin21

iTrader: (20)

so is your take at this point that if not trying to max out the pump, the dw has the potential to be at least equivalent to a 255? thats the biggest question i havent seen evidence towards.

maybe i just need to go bigger so the data applies

drb

iTrader: (39)

I ran out of fuel with the Walbro HP 255 on E-85 and 1450cc FIC Bluemax Injectors at a little over 500whp on VD (Dynojet Setting). That was on the factory fuel pump wiring. If you are talking 380-400 Dynojet AWHP the Walbro HP 255 will get you there.

Dan (drb)

mrfred

iTrader: (50)

In testing on my Evo, a Walbro 255 and DW301 on factory pump wiring appear to flow very similarly and will support the same power levels. On my buddy's Evo 10 with factory pump wiring, a Walbro 255 was able to support more power (~20 whp) than a DW301. There are several other similar reports of the DW301 flowing the same or less on factory pump wiring (e.g. see post #4 in this thread).

I don't have enough info yet to say whether one does better than the other with a rewire.

Either one can support the power level that you mentioned with E85.

drb

iTrader: (39)

I am anxiously awaiting the results of your Walbro 400 testing. Are you going to test it on the stock wiring and also with a rewire? I have a 400 installed on the stock wiring, but I'm waiting to get retuned until I can determine if a rewire is needed to support approx. 525HP on E-85.

Dan (drb)

mrfred

iTrader: (50)

I'll definitely test the Walbro 400 in rewire mode. There's no going back to fully stock wiring, but I can get back to pretty close to stock without too much pain. Just not sure if I want to put out that much effort when I suspect that a rewired Walbro 255 will be able to support my fuel flow needs.

saad601

Well, i dont know what u guys are on about...i put in a DW301 pump and without any changes to anything else..went from AFR's of 12's to 10.8 to 11........had to re tune it because it was running too rich and missing at spool...Also , i haven't even re-wire the pump yet....

tscompusa

iTrader: (31)

Ive done maybe 3 cars (ok maybe more) with DW300's and they all were the same results as mrfred sees here so i dont know what you're going on about saad601.

mrfred's tests are all done 100% on the money so if he says something listen to it.. dont question it.

tscompusa

iTrader: (31)

same here Dan. I want to see how it does not rewired, that should be interesting. it doesn't overrun the stock FPR not rewired right?

saad601

Tscompusa...im not questioning anything....im just telling what happened in my car...u guys are sharing info n so am i....

tscompusa

iTrader: (31)

once you start to run more boost and challenge the fuel pump flow you're gonna see the same thing everyone else sees. Its going to fall short of a walbro 255.

i can remember 3 customers off the top of my head who we had issues with after swapping to the dw300 pump.. Dw claimed it was from the oring not being sealed right on the pump, sent my customer a new oring, still same thing didnt fix it..

the pump just cant compete with the walbro 255. id be interested to see how it does once it sees full voltage.