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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 10-04-2012, 08:14 PM   #1
DavidU86
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Join Date: Jul 2007
Location: Phx, AZ
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My Ride: 03 M3
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.

Thanks,
David
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Old 10-04-2012, 11:59 PM   #2
illestminimike
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That's random dude.
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Old 10-05-2012, 10:12 AM   #3
DavidU86
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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?

~David
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Old 10-05-2012, 03:10 PM   #4
DavidU86
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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.

~David
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Old 10-05-2012, 03:33 PM   #5
DavidU86
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3.5 bar back in; all resolved.

Close/delete thread.

~David
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Old 10-07-2012, 09:26 PM   #6
Mallee
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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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