I have a 87 fc that I have been building for 2 years now. I just rebuilt a 91 j spec turbo 2 motor, I did a mild street port on the motor and increased boost to the motor I have a lot of other mods. But my big question is I bought a aftermarket adjustable fuel pressure reg for my car but I noticed the stock fuel reg is on my fuel rail. Is there a company that makes fuel rails to get rid of the stock fuel reg so I can put my new one on? The car is now a s5 not s4. thankyou

 

An aftermarket fuel pressure regulator won't help you unless it is a rising rate regulator and you have upgraded the fuel pump.

How much boost are you going to run and on what turbo? What mods so far?

As for the fuel rails, I don't believe there is anyone making rails for the 2nd gen. You'll need to cut the regulator off and weld on a fitting (this is very fun, by the way....).

 

im running just under 17 pounds at the moment, i still have stock turbo but looking into getting something a little bigger not 100% sure what type or kind. the motor has been rebuilt about 2000 miles ago it has a street port done and hardend apex seals still 2mm. ecu is a rtex 1.5 and i have alot of bolt ons. thankyou

 

what bolt on are you talking about?

 

17 pounds on the stock turbo?!?

You should definitely be looking to upgrade your turbo... Its rather inefficient at that pressure.

 

If you want to get rid of the Fuel regulator on the S5 rails,Try getting a set of S4 TII rails.
they can be modified to accept A/N fittings by merely Screwing them into the rail.
I noticed that you have to put a Washer under the "bolt on" location on the secondary rail.(put bolt through rail,put washer under it,between the rail and the manifold and tighten the rail down.)
Without that washer the rail will be to Tight..
Parallel the Fuel rails and run each one to the Regulator and have One Out to the Return line.

 

Check out fc3s-pro for a writeup