Cosmo/Supra/Nippon vs Walbro Pumps
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From: Queens, NY
Cosmo/Supra/Nippon vs Walbro Pumps
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?
"PLEASE NOTE, RC ENGINEERING NOW PERFORMS A FUEL PUMP FLOW MEASURING SERVICE. IT HAS BEEN FOUND THAT THE NIPPONDENSO COSMO FUEL PUMP AND THE WALBRO GSS-341 FLOW APPROXIMATELY THE SAME (THE COSMO ACTUALLY FLOWS A BIT MORE). IT WAS ALSO FOUND THAT THE COSMO PUMP HAS A MUCH HIGHER CURRENT DRAW THAN THE WALBRO OR BOSCH PUMPS. BECAUSE OF THIS, I SUSPECT THE POOR PERFORMANCE OF THE COSMO PUMP IN RX-7S MIGHT BE EXPLAINED BY INSUFFICIENT STOCK WIRING (WHICH IS SUFFICIENT FOR THE BOSCH AND WALBRO PUMPS)."
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?
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.
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.
NYC's Loudest FD
Joined: Mar 2001
Posts: 1,539
Likes: 1
From: Long Island, NY
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.
you will need a pump that can provide 100psi of fuel pressure at 30psi of boost.
'Tuna'
Joined: Feb 2001
Posts: 4,637
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From: Miami,Fl,USA
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
crispeed
NYC's Loudest FD
Joined: Mar 2001
Posts: 1,539
Likes: 1
From: Long Island, NY
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.
Last edited by RX794; Jan 8, 2003 at 07:34 PM.
'Tuna'
Joined: Feb 2001
Posts: 4,637
Likes: 3
From: Miami,Fl,USA
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
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
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WTF is wrong with it now?
Joined: Oct 2001
Posts: 1,492
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From: London, ON
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
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
Last edited by TYSON; Jan 20, 2003 at 11:32 PM.
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