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Old 11-07-2012, 08:53 AM   #31
NickG
Registered User
 
Join Date: Sep 2005
Location: South Florida
Posts: 187
My Ride: 2001 330ci turbo
No forced induction setup should run the IAT sensor BEFORE the compressor/turbo. That is just plain faulty engineering and a recipe for disaster. The sensor needs to be post-compressor/charge cooler so the ECU gets an accurate measure of the charge temp entering the cylinders. With the sensor before the compressor, there's no way to compensate for a faulty charge cooler or heat soak.

And for the record, the MS45's IAT sensor transfer function is DIFFERENT than that of the MS41/42/43 IAT sensor. Don't think you can just replace one for the other and your problems are solved.
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Nick
2001 330ci Turbo

Last edited by NickG; 11-07-2012 at 08:53 AM.
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