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Old 05-07-2012, 10:05 AM   #41
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Join Date: Sep 2005
Location: South Florida
Posts: 191
My Ride: 2011 BMW 550i M-Spor
Originally Posted by Hageee View Post
After that i bought a e39 fuel-filter, which has a very nice addon against the e46-fuel-filter: a changeable fuel-pressure-regulator. With a 4 Bar (58PSI) Regulartor, instead of 3.5 Bar (50PSI), the engine gets more fuel.
You're wasting your time doing this. The increased fuel pressure will cause the mixture to be richer than it should be. The ECU will see this richer mixture during part throttle (via the O2 sensors) and lean it back out over time with the lambda adaption. The end result will be the EXACT same mixture as running the PROPER 3.5bar regulator.
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