Will this MSD adjustable FPR work along with the Vortech FMU?

scootr · 11-15-2001, 04:30 AM

http://www.optauto.com/webstore/prod...k=yes&dept=334

It says it is adjustable from 36-45 psi, but will the FMU be able to get accurate levels after 45 psi? 36 seems pretty close to stock idle. Or will this not be much different from the stock FPR? I am looking for something similar to the SVX one and I was searching and this looked alright. They also have one without boost preference if it matters.

scootr

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scootr · 11-15-2001, 04:50 AM

Also what about the AEM universal FPR. I found it for 145$ at:
http://www.importhorizon.com/fuelsystems.html
Afriend of mine's boss has a RS-T that uses a weapon-R along with a SFMU of some sort after that. I was thinking maybe I could run the AEM or another kind where the stock one goes and use the Vortech I have for the pressure rise with boost. My only question is how will they work together. Like I asked before, will it over ride the adjustable one once it sees boost?

scootr

subachad · 11-15-2001, 11:22 AM

I don't see any reason why it wouldn't work.

The FPR goes on the fuel rail before the fuel returns to the tank so anything up line will be adjusted accordingly. The RRFPR goes on the fuel return line between the tank and the FPR so everything upline will be adjusted accordingly.

In otherwords if you put a dam creek, it backs up the entire creek. If you put a slightly larger dam just downstream you can flood the original dam and thus overriding it.

Does this make sense?

Chad
93 1.8T

P.S. The creek is a bad example since it's high flow, but not pressurized.

scootr · 11-15-2001, 11:37 AM

That makes sense. I think I am going to order it and see how it works. As long as it sets the idle around 36 like it says and raises past 45 after boost. And would I even need the boost one if it is mainly for idle?

subachad · 11-15-2001, 11:48 AM

The point of a RRFPR is to raise the fuel pressure, which will then force more fuel through each pulse of the injectors. This essentually gives you larger injectors. Check out the fuel injector stuff on www.grapeaperacing.com for some more info on this. They have an excellent write up that explains everything pretty well.

Chad

11-15-2001, 04:30 AM	#1
scootr Scooby Specialist Member#: 2649 Join Date: Oct 2000 Location: Sebastopol (Graton), CA Vehicle: 00 2.5RS-t cpe BRP 64 chevelle SS	Will this MSD adjustable FPR work along with the Vortech FMU? http://www.optauto.com/webstore/prod...k=yes&dept=334 It says it is adjustable from 36-45 psi, but will the FMU be able to get accurate levels after 45 psi? 36 seems pretty close to stock idle. Or will this not be much different from the stock FPR? I am looking for something similar to the SVX one and I was searching and this looked alright. They also have one without boost preference if it matters. scootr * Registered users of the site do not see these ads.

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11-15-2001, 04:50 AM	#2
scootr Scooby Specialist Member#: 2649 Join Date: Oct 2000 Location: Sebastopol (Graton), CA Vehicle: 00 2.5RS-t cpe BRP 64 chevelle SS	Also what about the AEM universal FPR. I found it for 145$ at: http://www.importhorizon.com/fuelsystems.html Afriend of mine's boss has a RS-T that uses a weapon-R along with a SFMU of some sort after that. I was thinking maybe I could run the AEM or another kind where the stock one goes and use the Vortech I have for the pressure rise with boost. My only question is how will they work together. Like I asked before, will it over ride the adjustable one once it sees boost? scootr

11-15-2001, 11:22 AM	#3
subachad Scooby Specialist Member#: 8488 Join Date: Jul 2001 Location: Sin City Vehicle: 1993 Impreza GCStyle Teal	I don't see any reason why it wouldn't work. The FPR goes on the fuel rail before the fuel returns to the tank so anything up line will be adjusted accordingly. The RRFPR goes on the fuel return line between the tank and the FPR so everything upline will be adjusted accordingly. In otherwords if you put a dam creek, it backs up the entire creek. If you put a slightly larger dam just downstream you can flood the original dam and thus overriding it. Does this make sense? Chad 93 1.8T P.S. The creek is a bad example since it's high flow, but not pressurized.

11-15-2001, 11:37 AM	#4
scootr Scooby Specialist Member#: 2649 Join Date: Oct 2000 Location: Sebastopol (Graton), CA Vehicle: 00 2.5RS-t cpe BRP 64 chevelle SS	That makes sense. I think I am going to order it and see how it works. As long as it sets the idle around 36 like it says and raises past 45 after boost. And would I even need the boost one if it is mainly for idle?

11-15-2001, 11:48 AM	#5
subachad Scooby Specialist Member#: 8488 Join Date: Jul 2001 Location: Sin City Vehicle: 1993 Impreza GCStyle Teal	The point of a RRFPR is to raise the fuel pressure, which will then force more fuel through each pulse of the injectors. This essentually gives you larger injectors. Check out the fuel injector stuff on www.grapeaperacing.com for some more info on this. They have an excellent write up that explains everything pretty well. Chad