255lph fuel pump question... - Mitsubishi Evolution Forums: Mitsubishi Lancer Forum

turbolarry · 08-15-2005, 06:42 PM

Well it's time for more fuel.

Does anybody have tuning issues with the 255lph pump? Over run? I think I'm going with the regular 255 and staying away from the high pressure unit (fear of over run going back to the DSM days). Any advice?
Which is the right part number, GSS-315 or GSS-317?

Fourdoor · 08-15-2005, 07:08 PM

With the EVO's you can go with the high pressure pump with no downside due to the fact that the ECU has control over voltage going to the pump, and runs it in slow speed under low load conditions. Not sure what pump number goes with what pump though.

Keith

turbolarry · 08-15-2005, 07:24 PM

It's not the low end I'm too worried about. It's nonlinier fuel pressure when tuning WOT.

umiami80 · 08-16-2005, 05:35 AM

I went through this and even bolted on a FPR to see what was going on. Somehow, the stock FPR does is's job quite well and you do get linear fuel control.

turbolarry · 08-16-2005, 10:39 AM

Quote:

Originally Posted by umiami80

I went through this and even bolted on a FPR to see what was going on. Somehow, the stock FPR does is's job quite well and you do get linear fuel control.

Cool.

You mean a pressure gauge right?

umiami80 · 08-16-2005, 11:14 AM

I actually hooked up this unit that hooked up to the fuel rail. At idle with vaccum you get 38PSI of fuel pressure. It is honestly the same with the stock unit for reasons stated above.....The ECU varries the volts to the unit, and the ecu controlls base fuel pressure perfectly.

NOW, for those of you who run like and AEM EMS I am not sure if the voltage varries so a FPR may be in order but even if that were true you could tune out the fuel overrun although some view that as a band-aid.

Don't waste your money until you need more then 500WHP......