Fuel Pump Dilema

[BennyH]

I still have a 6PSI JRSC kit.
I don't have plan to upgrade the boost yet but will go 8-10 PSI eventually.
I want to upgrade my fuel pump and injector.
I will get the Venom 320cc injector to lower the fuel pressure.
I understand the price between the Walbro in-tank fuel pump 255ltr/hr regular pressure and high pressure does not differ in price significant. So price is not really an issue, I want to get the high pressure pump but I was wondering on the drawback the high pressure pump may have, such as louder noise and causing too high fuel pressure for idle due to fuel pump higher flow capacity and the too damn restritive OEM fuel pressure regulator.
I can think of two way to fix the high fuel pressure at idle.
one is to do the Rafe Jeffey's fuel bypass trick and the other is by getting the new AEM adjustable fuel pressure regulator. They claim their FPR will go as low as 20PSI. Has anyone has any experience with this fuel pressure regulator?
OK. enough of the questions.
thanks.
ben

[BennyH]

Greg,
I have though of doing away with the OEM FPR but I won't be able to make that decision until I have the A/F gauges in the car and the J&S safeguard to find out how bad my tip in detonation is.
Can you elaborate more on the drilling a 0.0025" hole between the two sections of the stock FPR. Where do you drill the hole? Photo or steps how to do it would be nice.
Am I asking too much here?
thanks,
Ben

[Holden]

"You drill a 30 (0.025") thousands hole from the part that fits on the adapter into the part that the fuel exits from. It takes about two seconds to do when you take the regulator loose."

That's a quote from a thread somewhere around here. That's all I have. I haven't tried it myself.

Greg

[VaporTrail]

My question is why do you want Venom injectors? I'm not alone in saying they are unreliable (including TOO), RC is really a wise choice. Secondly, 320cc injectors will likely cause you a lot of problems, as the ECU cannot fully control them. If you go that large, which I can't understand why, at least get an SAFC, or piggy back PMS. Finally, you might want to stay away from the Walbro pumps altogether. I've had many failures on those pumps. Might want to consider an Endyn modified Bosch pump instead.

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-JG-
00 Honda S2000
88 Honda CRX (1.8 DOHC VTEC)

www.vapor-trail.net

[rjaffey]

I've been using a set of Venom 320s for a while now. I've had this discussion with TOO as well and though I keep an eye out for signs of trouble, I've seen no evidence that any of the cylinders are significantly leaner than the others. Still, I agree it's something to be wary of.

As to your comment "the ECU cannot fully control them", could you explain? I can't say I've had any trouble dialing in the fuel. The idle's good and the gas mileage has hardly changed if at all. By running lower N/A pressure, the larger injectors can be made to flow at stock rates, so the ECU has no trouble with them.

[This message has been edited by rjaffey (edited November 21, 2000).]

[Holden]

The high pressure Walbro will result in a higher minimum fuel pressure with the stock FPR in place. I think you'll have to deal with this problem no matter which pump you get, so you may as well get the high pressure one.

Other options you left out include:

1) Drilling a 0.0025" hole between the two sections of the stock FPR.

2) Doing away with the stock FPR altogether and tapping the JR fuel rail adaptor to hold a nipple. Then run hose straight from the fuel rail to the rising rate FPR.

Greg

[JRCivic]

Vaportrail...

Your post sounds more like an opinion than an experience.
I have NEVER seen a pump failure in any of my own customers' cars... which tells me the Walbro pump is fairly reliable. As for the Venom injectors, the only problems I have seen from them are resistance selection (low or high impedence) and plug style to fit your OE wiring harness. As for flow, I have never seen a problem.
By the way, I run a set of 320's in my own car... I have a stock ECU, and I use only mechanical FMU's to adjust the fuel pressures. I do not have a V-AFC, Fields SFC, etc.
My idle is perfect and my fuel economy is between 28 and 29 mpg.


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'93 Civic Si H/B with B18C1, JRSC @ 8psi
Best 1320: 12.68 at 110 mph