Chris@DW

Hey guys/gals,

While doing some test fitting of the DW301 pump in the OE 350Z assembly, I went ahead and did some flow testing so we could have some stock vs. DW comparisons.

The OE fuel pump @ 13.5 volts flows in the assembly -

40psi - ~150LPH
50psi - ~135LPH
51psi - ~130LPH

The OE assembly has a built in fuel pressure regulator that starts to open around 50psi and fully opens between 51-52psi.

The DW301 pump @ 13.5 volts flows in the assembly -

40psi - ~305LPH
50psi - ~290LPH
51psi - ~270LPH

Outside of the assembly, the pumps flowed 6% more vs. flowing through the assembly. The OE 350Z pump flowed ~100LPH @ 80psi.

I figured since I had to opportunity to do these flow tests, might as well post the results, too.

-Chris

350z006

iTrader: (79)

Nice...any chance you can do one vs Walbro 255?

midz350

iTrader: (4)

GreenGoblin

iTrader: (6)

Thank you for sharing that info.

SH Luciano

iTrader: (1)

obviously that chart isn't application specific, which is why i think he was looking for a test against a walboro 255.

Vq.turbo.DremZ

iTrader: (6)

Why would the application determine how much a pump will flow? The rest of the fuel system will be the limitation, and most people who will use it will upgrade to RFS anyway.

tonyzS/C03

iTrader: (3)

because the housing inside the tank will affect flow diff for each application. like the results Chris posted from the start, outside the housing the stock pump flowed about 6% more. The chart is probably just showing the flow of the pump itself with no housings or anything to restrict flow.

mx594

iTrader: (4)

Any idea why the sudden drop between 50 and 51 psi? I mean from 40 to 50 it only dropped 15 LPH, but from 50 to 51 it dropped another 20 LPH? Seems like bad data.

Chris@DW

The internal fuel pressure regulator starts opening @ 50psi and begins flowing fuel back into the tank. It is fully open between 51-52psi. The OE assembly will not allow pressure to increase above that, and flow cliff dives when the pump is attempted to be pushed above that.