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Old 10-25-2002, 03:28 PM   #1
Pi7467mp
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Member#: 19124
Join Date: May 2002
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Default Rich Idle fix!!!

Here is the scenario... I used to have a 1994 Acura Integra with a supercharger running 10psi of boost. I had a walbro 255lph fuel pump, RRFPR, and 330cc injectors. Needless to say the damn thing was running hella fat. There is a company by the name of Endyn that specializez in Jackson racing superchargers so I called them and asked them what to do. They said it is an easy fix. All you have to do is take off the stock fuel pressure reghulator and drill a relief hole so the excess pressure will subside. It is a little hard to explain so I will post a link. This fix is for Honda and acura, but the regulator is almost identical.
I treid this mod on my 2000 Impreza 2.5 RS Turbo and itmade the worl of difference. Idle is smooth, and you can smell a cleaner burning exhaust.. well anyway here is the link.
post any replies.
http://www.theoldone.com/articles/regulator/
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Old 10-25-2002, 05:07 PM   #2
Midwayman
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Or you could buy a cheap SVX regulator......
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Old 10-25-2002, 05:17 PM   #3
crash
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This subject is one of those that I have not spent much time researching on...

Can someone inform me what exactly the SVX FPR does that the stock impreza one doesn't.

And what kind of condition(s) i should shoot for when it comes to Fuel Pressure at Idle, cruise, and WOT.

Thanks!!!

-Nathan
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Old 10-25-2002, 05:43 PM   #4
Midwayman
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The SVX FPR is essentially the RS FPR with a larger hole. Its maxinum flow back to the tank is greater than the stock RS one.

Not having large enough drainback capacity increases idle pressures (usually from a upgraded fuel pump) and can cause idle issues.
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Old 10-28-2002, 09:58 AM   #5
svxtrem
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You're right about the return, if you are getting excessive pressure at idle, the SVX regulator will cure it. But...one problem- SVX regulator is set for 36 psi, not 43. So you will lose pressure.
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Old 10-28-2002, 11:33 AM   #6
8Complex

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The problem is the larger flow and pressure of the new pump. The stock regulator can't handle it and raises up the pressure 10+ psi. An SVX or even a WRX regulator is meant to handle more flow/pressure, so they will be able to handle it just fine if you upgrade a RS's fuel pump.
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