UrS4... Do we need to make any fuel pressure changes
07-15-2003, 06:59 AM
#2
An adjustable FPR is a nice touch with stage 3 as it does provide some measure of adjustability...
it's not absolutely necessary as the car runs great without it. But there are some benefits/gains to be had with it especially at WOT. Subtle changes in fuel pressure can make HUGE differences in performance. But without a fuel/air meter you'll be flying blind on optimum settings tho you will know when your "way" in/out of the ballpark.
If you want Stage 3 to perform a little better than "out-of-the-box" it's an indispensible tool. But if you have no plans of a fuel-air meter then I'd pass on it as it's too easy to get lost in the adjustment process and you can't "feel" an optimum state of tune... just an area to the rich/lean side of it.
If you want Stage 3 to perform a little better than "out-of-the-box" it's an indispensible tool. But if you have no plans of a fuel-air meter then I'd pass on it as it's too easy to get lost in the adjustment process and you can't "feel" an optimum state of tune... just an area to the rich/lean side of it.
07-15-2003, 07:17 AM
#4
No, ARC-2 is a MAF calibrator. FPR sits at the inlet of the fuel rail...
and is held in with a metal clip. Takes less than 5 mins to swap FPR's in our cars. But do not add it at the beginning of any Stage 3 conversion but rather at the end or you risk compromising any/all benefit of everything. It should be the last modification in the S3 conversion. And only then after you have plenty of seat-time w/Stage 3 components so you have some familiarity and can feel subtle changes.
07-15-2003, 07:31 AM
#6
A threaded set screw/jam nut arrangement...
<center><img src="http://pictureposter.audiworld.com/711/adjfpr.jpg"></center><p>
Here's the adj. FPR on my car. It's a modified stock 4bar Bosch FPR thats been modified to be adjustable from about 2-8 bar (+or-30-120psi).
Just turn it in to increase pressure and back it out to reduce pressure then tighten the lock-nut once desired pressure is achieved.
Inside it has a couple of spring guides and a 3mm ball bearing w/cup point SS adjustment screw. One turn of the screw is equal to approx 10psi.
Comes with a brand new, modified Bosch FPR and runs $150+ shipping.
Here's the adj. FPR on my car. It's a modified stock 4bar Bosch FPR thats been modified to be adjustable from about 2-8 bar (+or-30-120psi).
Just turn it in to increase pressure and back it out to reduce pressure then tighten the lock-nut once desired pressure is achieved.
Inside it has a couple of spring guides and a 3mm ball bearing w/cup point SS adjustment screw. One turn of the screw is equal to approx 10psi.
Comes with a brand new, modified Bosch FPR and runs $150+ shipping.
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