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- Oct 21, 2004
- Location
- BFE Desert east of Cali
I could barely hear the whine from either of my Walbro's, AEM 320 in the wagon now is just a touch quieter, enough I can't hear unless I REALLY try and listen for it.
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I'm looking to upgrade my fuel system after a trip to the dyno indicates I'm running out of fuel. Should I stick with the tried and true walboro 255 or something from the DW catalog? I'm not trying to reinvent the wheel, I'll be attempting to braze a larger nipple or AN fitting onto a stock fuel rail. The car has k-jet piping which appears to be 8mm up to the fuel filter. I'll just bypass the k-jet pump and use an 8mm line to the rail from the 740T filter. Anyone know for sure the size of a stock filter outlet, I'm thinking it's 12-14mm?I don't plan on running E-85 anytime soon, so I'm thinking 8mm all the way through will give me enough volume on pump gas.
What size injectors, what base fuel pressure, how much boost, and how much power are you aming at?
The k-jet -909 and -957 pumps are close to 180lph up to about 7.5bar (108psi) total pressure. That is pretty good. The original fuel rail and lines are really capable too.
I was running a walbro 255hp pump with my b21, with deka 60's, a 55psi fpr (that dodge thing) and 32psi boost on top of that. I was running out of fuel already before 350whp. Just because the total pressure was too high. At 87psi the walbro only pumps out 160lph. That's 2,67 litres a minute, and my injectors (708cc @ 55 psi) needed 2,83l/min.. In the datalogs the dutycycle would be off the chart, but not because the injectors were too small, but because the fuel pressure was dropping and forcing the injectors to open for longer periods of time to deliver enough fuel. So I switched to the "new" dw300 pump which is rated at ~220lph@90psi.
Choosing the right pump is not as easy as just looking at flow @ 3bar on a turbo car.
Will the stock 240 wire and relay be suffice for the walbro 450?
+1.Also, if yall aren't using submersible grade fuel line in your tank, you WILL have a failure (ask me how I know :cough: ), so if you did that.. uh.. maybe go back when you have a free weekend and replace that with the good stuff. It's expensive, but you don't need a lot.