I am adding a turbo so do I need to do anything for vaccum accessories such as fuel pressure regulator or brakes.

1.) Do the brakes retain enough stored vaccum that it is a non issue?

2. ) For the vaccum fuel pressure regulator what do I need to use if I am running the 749 w/ $58 code.

Thanks

 

There won't be too many circumstances where you'll be on the brakes with the manifold under pressure to worry about.

 

What about the fuel pressure regulator?

 

The fuel pressure regulator keeps the fuel pressure constant relative to the pressure in the manifold. When the manifold is under boost, the fuel pressure regulator is going to want to know about it.

 

How do you resolve the issue then?

I am assume a stock or after marketign adjustable fuel pressure regulator will not work well due to they are not made to accomodate boost.

Does that mean go to an aftermarket boost sensing fuel pressure regulator and if so any suggestions? Also is it really necessary if you are using $58 code with properly sized injectors/pump?

 

The stock fuel pressure regulator will work fine. If you think of WOT on an NA car (0 vacuum, 0 boost), it is at 14.7 psi absolute. I believe the stock OEM fpr is 1:1, so if you run at 10 psi, it'll add 10 psi to the fuel pressure to compensate (i.e. 24.7 psi absolute). You should have no problem, as it doesn't care that you are running forced induction or not. Just make sure your fuel pump can handle the higher pressures.

 

simple.


there isnt a issue.


fuel pressure = manifold pressure on the diaphram + spring pressure.


since its a 1:1 ratio on the manifold pressure, if you set your FPR to 40PSI, then (compared to manifold pressure) its a constant 40 PSI, under vacuum and under boost.