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      04-27-2010, 06:26 PM   #5
mixja
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Drives: 2011 E90 DCT Silverstone
Join Date: Jun 2008
Location: Beverly Hils, CA

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Many ECUs also can have ignition timing or fuel correction maps based upon atmospheric conditions. So for example, your ECU might currently be programmed for a timing value of 28 degrees at a certain load point at 68F, but at 100F that timing value might be 25 degrees.

I've asked this question before on this forum and PencilGeek said there are no temperature correction maps in the case of the M3.

Like others have said, I do notice a difference in performance - the threshold for "lesser" performance seems to be > 22-24C, however I do live in a humid climate...