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Old 08-06-2008, 06:12 AM   #1
vids
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Member#: 120113
Join Date: Jul 2006
Chapter/Region: International
Vehicle:
2002 WRX, full-race,
GT35, built engine, etc.

Default Single intank weldon fuel pump possible?

Is there a close to bolt-on (a little fabrication of metal parts is no problem) weldon fuel-pump that I can use in-tank?
I would like to switch over to E85, and I have already maxed out my walbro 255lph on pump gas. I have 1000cc injectors and a aeromotive fpr already.

Why intank and single pump?
I would just like to avoid complexity as much as possible. I would like the fuel-system to be care(and worry)-free for a couple of years, at least.
I also have a litte "surge-tank" around my intank-walbro right now, that allows me to do sharp turns without surge.
Anti-surge-tank:
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Last edited by vids; 08-06-2008 at 06:20 AM.
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Old 08-06-2008, 11:14 AM   #2
vids
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Default

Seems like weldon does not have anything like that.
Is there another single intank pump alternative?
Will need the strength of a double walbro, just not happy about the possibility of one failing pump.
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Old 08-07-2008, 02:13 PM   #3
bluescoobywagon
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Location: The land of E85
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Not A Wagon!
2011 WRX - 285s on 18x9.5

Default

Bosche 044
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Old 08-07-2008, 04:08 PM   #4
vids
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Default

Quote:
Originally Posted by bluescoobywagon View Post
Bosche 044
I wonder if that would be enough fuel-flow? I am maxing out the 255lph now, and it looks like the 044 is 300lph?
On E85 it I should need 30% more, and because it is sort of "racing fuel" I will up the boost, needing even more fuel. Probably needing almost 400lph to be sure?

But the bosh might deliver more fuel at a higher pressure, and is better than what I have at the moment though...
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Old 08-07-2008, 05:02 PM   #5
bluescoobywagon
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Default

You didn't really say how much boost you're running or what your current duty cycles are. The Bosch should support about 80% duty cycle on those injectors at about 25-26 psi. Typically that's about 450-500hp of fuel on E85. That's the pump I'm planning on running and I'm using a surge tank to feed the Bosch with 10an line. 8an to the rails. 8an to the regulator. Dual 5an return to the surge tank. I'll max out my 835cc injectors before I'll max the pump. If I was running dual pumps, I'd set up a safety circuit that checks boost level and fuel pressure using a pair of Hobbs switches. Not enough fuel would cut boost. Then again, I'll probably run that with the single pump...
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Old 08-08-2008, 05:01 AM   #6
vids
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Default

Don't know the duty cycle, but I guess the injectors are big enough.

My engine has a very strong midrange due to the full-race twin scroll gt35 kit. It seems to need a lot of fuel in that range.

Testing with 29/30psi on pump fuel, the walbro ran out of fuel at 3800rpms, producing 445 ft-lbs of torque at that point. The max torque should come around 4200rpm.
On E85 that could be a nice boost-level, but would need a lot of fuel.

I (or rather, the tuner) lowered the boost to 21psi and tuned it there. Giving 404 ft-lbs of torque at 4200rpm. Something else is holding me back at high rpm though, so I have no bragging rights in the high-horsepower community :/
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Old 08-08-2008, 05:04 AM   #7
vids
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Default

Quote:
Originally Posted by bluescoobywagon View Post
If I was running dual pumps, I'd set up a safety circuit that checks boost level and fuel pressure using a pair of Hobbs switches. Not enough fuel would cut boost. Then again, I'll probably run that with the single pump...
Hm, I like that solution! I have a standalone GEMS ECU, could probably plug a wire in there that can trigger the boost-cut.
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