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-   -   Alien OEM Fuel Pressure Regulator pulled from 03' M3 (http://forum.e46fanatics.com/showthread.php?t=948717)

DavidU86 10-04-2012 07:14 PM

Alien OEM Fuel Pressure Regulator pulled from 03' M3
Changed the fuel pressure regulator today. I am perplexed because the one I pulled out of the car is a Bosch 3.5 bar not meant for the S54 engines (#0280160597). I've never noticed any ill effects; I am second owner, and picked up the car at 17k miles (Currently at 52k). I dyno'd it shortly after I got it with only a Borla muffler (Installed by previous owner), and it put down 278 rwhp on a mustang dyno after 3 runs in about 72F at 2600' elevation.

The FPR I just put in, is the correct 5.0 bar meant for the S54 (#13531404089). I've tried researching this, and it seems that the 3.5 bar FPR I pulled out never should have been on the car. I have all the maintenance records from previous owner, and of course the FPR (or anything fuel related) was ever touched.

Any explanation for this? I'm concerned running the new 5.0 bar FPR will induce some issues.


illestminimike 10-04-2012 10:59 PM

That's random dude.

DavidU86 10-05-2012 09:12 AM

Driving around with the supposedly correct FPR (5 bar), the car seems to have lost quite a bit of umph; the idle catches itself way down at 200-400rpm every time I left off; throttle response is delayed. Overall, everything smells rich. LTFT shows -9%/-11%; STFT jumping from +2% to -6%. Throw the incorrect 3.5 bar back in?


DavidU86 10-05-2012 02:10 PM

After only another day of driving (~15 miles): LTFT are now at -12/-13%. I think I'm going to throw the 3.5 bar (Incorrect FPR) back in. This is so strange.


DavidU86 10-05-2012 02:33 PM

3.5 bar back in; all resolved.

Close/delete thread.


Mallee 10-07-2012 08:26 PM

I wonder how much the engine management would have to relearn after a fuel pressure change?

I've no suggestions on what you should do though.

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