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      11-12-2011, 03:59 AM   #5
Mike Benvo
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Drives: Harrop SC M3 / E46 M3 / 7Turbo
Join Date: Apr 2008
Location: SoCal

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2008 BMW M3  [5.00]
1990 BMW 735i Turbo  [5.00]
2004 BMW M3  [0.00]
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The colder the better to an extent. It becomes a balance of the variables. There is no "magic" number.

You have to look at:
1. Air Density (colder air = denser air = more oxygen available for combustion) End result is ECU runs more timing and car makes more power. The difference between very cold and very hot can be a significant amount of horsepower.
2. Traction in very cold temperatures might be an issue
3. Oil/Coolant configuration should match environment car is located in
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Last edited by Mike Benvo; 11-13-2011 at 09:29 PM.