FPR Question

[Slugstang]

Is there a specific FPR for the 2.3l or will a 5.0 fuel pressure regulator work? I have seen several post on adding a aftermarket FPR but none state which one to use. Search function didn't turn up a exact answer. Thanks

 

[bhuff30]

yup, use a 5.0 FPR. The fitting are the same.
If you want an adjustable FPR with no vacume reference, I have a new one I will sell cheap. Just PM or email me.

 

[Slugstang]

Sorry but you will have to bear with my ignorance on most EFI related topics. I'm a carb guy and this "EFI turbo swap" is my first stab at an EFI system. What is the diffrenece between no vacume reference and one that has vacuum reference? I did a quick search but nothng came up defining them.

Thanks

 

[bhuff30]

The vacume reference is a simple reference line to the intake manifold for vacume pressure. As manifold pressure drops, less fuel pressure is required to squirt fuel into the manifold. For example, at wide open throttle, you have 14.7 apsi of air in the manifold, and 40psi of fuel pressure. At idle, you have ~7.7 apsi of air in the manifold. Idealy, you want the fuel pressure to reduce the fuel pressure to 33psi, or it might run a little rich. It really comes into play when you have forced induction. For 20 psig of boost, you need 60psi of fuel pressure, and a FPR without a vacume reference will leave it at 40psi.