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      01-03-2009, 08:54 PM   #19
BimmerRob08's Avatar

Drives: 2008 M3, Space Gray
Join Date: Mar 2008
Location: KIKR (ABQ), NM

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Originally Posted by Edman951 View Post
Could it be because our motor doesn't have a MAF sensor, it use's a MAP sensor.
That with small increased in flow, the ECU doesn't adjust the fuel perfectly.
Making the car run different, and not at peak performance.

Map sensor aren't good with increased flow corrections compared to MAF.
Increased flow would not be detected by the MAP sensor.
Since it mesures pressure/vaccum changes, and increased flow doesn't affect pressure or vaccum.

On cars with MAP sensors, normally any changes in intake or exhaust requires a retune to optain peak performance.
can you put that in simpler terms for us? Are you saying that our M3 does not have a MAP sensor or a MAF? What is a MAP or MEF by the way??