Adjustable FPR question

[1GjGST]

What is the preferred psi to have the regulator set on stock?.. If i have 15psi what is the recommended psi for the FPR?.. The fpr is a adjustable and i have a 255 walbro fp. I am just trying to find a good psi to start with and diagnose it from there. Is there a formula chart for every psi of boost you run you have x amount of Fuel pressure?.. Thanks
I have a manual transmission by the way..

 

[Colt4G63 also]

38 psi or 43 I believe. It depends if you have a manual or auto.

 

[donniekak]

Your boost pressure has nothing to do with your base fuel pressure. The regulators purpose is to keep the pressure difference between the fuel rail and manifold constant.

 

[orrickr]

Couldn't have said it better myself.

 

[Colt4G63 also]

I have a manual transmission by the way..

Then set it at 43.5 I believe is the exact setting with the vacuum line disconnected. As long as you have a 1:1 fuel pressure regulator, the vaccum line will allow the AFPR to compensate properly for any level of boost you run automatically.

The vacuum line reference port on the AFPR automatically keeps the fuel pressure at 43.5 psi higher than the pressure in the manifold so that it's always a constant.

 

[donniekak]

1g manuals are 37 psi.

 

[Colt4G63 also]

1g manuals are 37 psi.

I was worried I may have it backwards. DOH!

Excuse me, I have to go adjust my fuel pressure.

 

[1GjGST]

So should I set the AFPR to 43.5 or does it come pre-set?..

 

[SrKegler]

If you have a 1G, like in your profile, set it to 37

 

[EclipticalGS]

Whats the base fuel pressure for a 2G by any chance, not trying to thread jack but, should i run a seperate vac line to FPR? or use the old FPR's vacuum line and jsut elave the old fpr unplugged.

 

[95GreenGSX]

Wow people, Really?!

1g= 37 psi
2g= 43.5 psi

Make sure you set the pressure with the vacuum line off.

 

[kenamond]

You can use the same vaccuum line for the new FPR. And the 1g autos have a different base fuel pressure than manuals as was mentioned, though I'm not positive what the two numbers are (Search button will answer all of this, by the way).

For a 2g turbo cars, it's 43.5psi.