jr

A quote from Wade Lanham's site (http://www.newwave.net/~flanham/wlan...l/fuelfaq.html) :

With that said is their any advantage to a Walbro or disadvantage to a Cosmo/Supra/Nippon pump other than the wiring?

What is the best way to go about upgrading the wiring to the fuel pump? Recommended gauge, route, etc? What about disabling the relay that bumps the voltage up ~3K RPM?

the_glass_man

iTrader: (2)

Supra TT Pump.
Toyota part number is 23221-46110
260 lph @43psi @12v
290 lph @43psi @14v

Just a few others.
Mazda RX-7 Twin Turbo
210 lph @43psi @12v

Mazda Cosmo
250 lph @43psi @12v

3000 GT VR-4, Celica GT-4
180 lph @43psi @12v

I would go with the Supra pump, its a straight drop in, and its bigger then the Walbro, flows more, and is more reliable.
BWT: I went with the Supra pump.

RX794

I've been doing some research on the fuel pumps available, and from what I gather, if you wanna run high boost and still have a quiet pump there is no other choice than the Bosch pumps, the ND pumps don't provide enough pressure at high boost(27-30psi), they fall off because they have pressure relief valves built into them, even if you run 2 ND pumps you will still have that problem, I'm talking pressure here, not volume. This happens because FPR rise 2psi of fuel pressure for every 1psi of boost, do the math, if you wanna run 30psi of boost and your base idle fuel pressure is 40psi,
you will need a pump that can provide 100psi of fuel pressure at 30psi of boost.

the_glass_man

iTrader: (2)

30 psi of boost???
Don't think I'll be doing that anytime soon.

crispeed

If you're running a FMU rising rate type regulator then don't use the ND pumps. If it's the regular type Regulator, 1:1 rate then two ND pumps will do the job depending on power goals. I believe the relief valve are set to 90 psi on the ND pumps.

crispeed

RX794

Some of the guys at T&R Racing have done tests on the ND pumps by blocking off the return after the regulator, and the most pressure they've seen is about 70-75psi(even with 2 ND pumps). If you measure the pressure BEFORE the fuel lines go into play right at the pump you might get 90psi of pressure, but testing it after the regulator is the way to go, due to the fact that that's how you'll be using it.

crispeed

That's weird because I've seen 90 psi registered on the fuel pressure guage with only one pump. As long as the fuel pump circuit, relay and resistor box are functioning properly you should get more than 70 psi.
When I do dual pumps I would use a #10 fuel line.
I've used many ND pumps on hondas etc. with bolt on turbo kits using FMU's and have seen as high as 90 psi on the guage.


crispeed
87 Rx-7 TII
9.204@150.47mph
2600lbs
un-tubbed

RX794

The ND pumps that I'm talking about here are the Supra TT ones, lemme check with the guys 2morrow just in case to make sure and I'll let you know as soon as I find out for certain.

fastrotaries

i use the supra TT pump with no problems.

RX794

At what boost level have you run the car up to?

TYSON

Has anyone measured the current required by the Supra pump at 70 psi or so? I'm wiring soon and need to know.

Never mind: Found the link to Lanham's test results. It looks like the 20 amp relay with the E11 may not be enough for me