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      08-06-2012, 03:28 PM   #54
Grease Monkey
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Drives: 2011 E90 M3,1994 Euro E36 M3/4
Join Date: Apr 2006
Location: Fort McMurray, Alberta, Canada

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Originally Posted by Superfly_M3 View Post
How can the Speedo, or even the ECU register 20mph at redline???
Isn't the speedo based on rear wheel speed and not front wheel?
The car monitors road speed from both the transmission output shaft and all four ABS wheel speed sensors. The speed from all four wheels is required by the ECM(s) so it can properly control the DSC.
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