would it be ok to just throw in a fuel pump and no management? I'm running a fully open exhaust, meaning no cats watsoever. I have a boost controller and it holds boost at the standard 10-8-10 pattern.

OR do i even need more fuel since boost is still at stock levels? I don't have the funds for a PFC just yet...so i want to do what i can in the mean time.

My friend gave me a turbo supra fuel pump out of his car so i wouldn't be spending any money on a fuel pump.

 

I don't think you'd get much if anything from the Supra pump. It's pretty conservative.

Upgraded pumps just flow more fuel to meet demand. If you run higher fuel pressure or larger injectors, the stock pump wouldn't be able to keep up. Just putting in the pump won't get you more fuel - the exception is the Walbro in some cases. It moves a LOT of fuel, and I've seen it overrun stock fuel pressure regulators resulting in higher fuel pressures at the rail.

The general concensus is if you keep it at 10psi with the stock ECU, you'll be OK. But, I would put that PowerFC in before you go any farther - I'd keep the stock intake as well to stay on the safe side. PFC's go for around $800 now with commander, so it's QUITE affordable for what all it can do for your car.

Dale

 

Just keep the pump until you've got the upgrades that will require you to need it!!

 

So is it a bad thing using the Walbro to 'try' and bump up the fuel pressure? Say it becomes a case where it DOES result in higher fuel pressure...will it harm anything else? i know it's probably not the way to go...and i probably won't do it, but i'm just curious as to what would happen.

kev

 

Just adding a fuel pump won't increase your fuel pressure. Unless you replace the Fuel Pressure Regulator, you'll still be supplying the same amount of fuel regardless of the fuel pump (unless you use a fuel pump that is so strong it overwelms the FPR).

 

My understanding is that the stock computer is too conservative. With too many mods it just can't command enough fuel regardless of the pump.

 

i thought the stock ECU ran rich compared to the PFC with minor bolt ons?

 

At 10 PSI on the stock twins, yes.

 

Doesnt that all have to do with the PFC's tune?

 

Yes, I believe potatochobit was implying about the PFC "base map".

 

Gottcha. For some reason that didnt even cross my mind.