97/98 Vette FPR Reference?
Adkoonerstrator
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From: Deep in the seedy underworld of Koonerville
The '97 vette regulator is referenced. In the picture below you can see the nipple on the regulator where the manifold reference hooks too. 
http://harlan-engineering.com/incon/..._enginebay.jpg
http://harlan-engineering.com/incon/..._enginebay.jpg
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Joined: Oct 2004
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From: Simi VAlley,CA
The fuel pressure regulator is a diaphragm operated relief valve with fuel pump pressure on one side and regulator spring pressure on the other side. The fuel pressure regulator is vented to atmosphere. A software bias is used to compensate injector on-time because the regulator is not referenced to manifold vacuum. The injector pulse width varies with the signal from the MAP sensor. With the ignition ON and the engine OFF, system fuel pressure at the pressure test connection should read 380-420 kPa (55-61 psi). If the pressure is too low, poor performance could result. If the pressure is too high, excessive odor and a Diagnostic Trouble Code (DTC) P0132, P0152, P0172 or P0175 may result. The Fuel System Diagnosis table has information on diagnosing fuel pressure conditions.
The tube you see is the "fuel pressure regulator purge tube" and has nothing to do with pressure regulation.
The tube you see is the "fuel pressure regulator purge tube" and has nothing to do with pressure regulation.
Last edited by Oscar Will; Jun 23, 2005 at 05:17 PM. Reason: add info
Joined: Nov 2001
Posts: 1,707
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From: Anderson, Indiana
Oscar has it correct. GM takes the line to the front of the throttle body where there is no reference vacuum anyway. It's more like they didn't want to leave an open nipple on the engine for fear of everyone thinking something is missing from their car!
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91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
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91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
Ok Well tell me what I need to do. Right now I have the truck intake,fuel rails,etc.. The truck FPR has a tube coming from the top of the FPR to the top of the intake and goes into the intake. What is that tube and why does it go into the truck intake. If it is the reference what do I need to do with my new setup which will be LS1 intake and 97/98 vette fuel rail with regulator?
Joined: Nov 2001
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From: Anderson, Indiana
Ahhh....since you are doing this on a truck, definitely hook the Vette FPR up to a vacuum source! The IFR table in the truck PCM is set up for a vacuum referenced regulator, so you will be properly matched up by hooking it to any vacuum source on the intake manifold.
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91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
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Originally Posted by Speartech
Ahhh....since you are doing this on a truck, definitely hook the Vette FPR up to a vacuum source! The IFR table in the truck PCM is set up for a vacuum referenced regulator, so you will be properly matched up by hooking it to any vacuum source on the intake manifold.
Wow! Thanks alot John! GLad to hear its just that easy!
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Joined: Nov 2001
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From: Anderson, Indiana
You wouldn't need to hookup a vacuum source if you've converted it, just change the IFR tables to match whatever injectors you are using.
Keep in mind, you still need a regulator and return line somewhere in the system in order to maintain the needed 58 psi. The changes to the injector table are based on the size of the injectors and whether the regulator is vacuum referenced or not.
Keep in mind, you still need a regulator and return line somewhere in the system in order to maintain the needed 58 psi. The changes to the injector table are based on the size of the injectors and whether the regulator is vacuum referenced or not.
__________________
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
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updates? You wouldn't need to hookup a vacuum source if you've converted it, just change the IFR tables to match whatever injectors you are using.
Keep in mind, you still need a regulator and return line somewhere in the system in order to maintain the needed 58 psi. The changes to the injector table are based on the size of the injectors and whether the regulator is vacuum referenced or not.
Keep in mind, you still need a regulator and return line somewhere in the system in order to maintain the needed 58 psi. The changes to the injector table are based on the size of the injectors and whether the regulator is vacuum referenced or not.
Joined: Nov 2001
Posts: 1,707
Likes: 33
From: Anderson, Indiana
We're in the middle of building the exhaust system now.
It won't be much longer.
It won't be much longer.
__________________
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
