In the evo that I'm currently running a DW rewired pump in. I went 11.1@130 with a crappy 60' a few weeks ago, hitting 110%+ IDC. Over the last year, I've had to lower my bfp to 37psi in order to compensate for the fuel pump simply not putting out enough fuel.

I am wanting to be safe to run up to 36+psi on my FP Black (and possibly have the ability to up the fuel pressure back up to stock) without any dropoff, and Im wondering if I should finish gathering parts for a double pumper (2x walbros) or just go with the new Walbro 450lph.

Looking at the chart below, It looks like the walbro 450 is pretty close to what dual wallys can put out. But I dont understand how many cc's I need for my car (dont really understand this chart in terms of relating it to my car). The chart was taken from mrfred's post on here.

My fuel mods are:
-1350cc injectors (barely cleaned and all flow 1350cc)
-Fuelab mini set at 37psi
-6an from rail to fpr
-Rewired DW pump

This is on a stock motor running e85, and Im guessing in the upper 500's whp range from previous dynos and runs. pics of flow sheet and the car:







Thanks for the help

 

Just do a double pumper. Cause you have an aftermarket fpr you can runs both pumps all the time or use a hobbs switch. But if you run both all time I would run a -6 or -8 to the rail then use the factory feed as the return or make your own.

 

Thank you for the reply, however im asking if i could use the walbro 450 and not have to install two pumps and have to rewire it. From the looks of the above graph, it looks like the 450 is really close in flow to the two pumps at the psi im at, but i need to hear some other real-life experiences as well as someone who can better read the graph in depth lol.

thank you

 

The only concern i see is that the pumps arent tested at the same voltages. Is it due to over heating? Idk. But according to the graph i would say the 450 would be fine. I guess what need to be looking at is what the fuel pressure will be with boost on top ofbase pressure.
It hard to explain what im trying to say. But like you said your looking for someone that hass gone that route.

 

What's your current peak power and boost at peak power. Also, what fuel?

 

Peak power not sure but from previous dynos and comparing them I'd say around 560-580 on e85 and peak boost it currently sees is 34lbs, peak power is right around 33-34lbs. I'd like to be able to up the boost with 37psi bfp, or possibly even up it back to stock and up the boost as well.

Thank you

 

People are making 700 whp with E85 using a double pumper, so that for sure would get the job done. Whether a Walbro 460 is really as good as the pump flow data indicates is yet to be determined. And on top of that, using a Walbro 460 means that the fuel must flow through the factory filter in the pump carrier, and there could be a lot of restriction in that filter.

If you're curious about how your fuel requirements relate to the fuel pump flow chart, I'd say your motor is needing about 5000 cc/min at peak power. Necessary fuel pressure at the pump would be 37 psi (your base fuel pressure) + 34 psi (boost) + pressure rise from pump to rail. -6 AN line itself would be around 5 psi pressure rise, but the pressure rise across the fuel filter in the pump carrier is totally unknown. It could be anything from 1 psi to 20 psi. Assuming its 10 psi, then total pressure at the pump is 37 + 34 + 5 + 10 = 86 psi. I'm surprised that the DW could even come close to supplying the necessary fuel.

 

Thanks for the response. Has anyone seen any info on the new walbro pump?