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Re: Why does car feel like it has more torque in c (archive)
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Posted by Neil Deshpande on December 30, 2001 at 21:33:08:

In Reply to: Why does car feel like it has more torque in cold? posted by Ben Kraus on December 30, 2001 at 18:54:33:

Ben:

I agree with Mark.

Basically, the air is denser. Density is proportional to absolute temperature so air at 104 F (40 C=273+40 absolute) is going to be 14% denser than air at 32 F (0 C=273 absolute).

The AFM senses something between air mass and air volume (mass sensing would be ideal, but that only came with the E34 M5) so the greater mass (volume is same at a particular engine RPM) deflects the AFM flapper more. This means more fuel is injected in (AFM flatter deflection controls fuel flow) and more power is made.

For the E34 there would be about 14% more power, for the E28 a bit less of an increase than that. For the 0-40 C shift.

Neil Deshpande
http://www.neilwerke.com

***


I live in Chicago and notice that during the winter my car is abnormally torquey when temperature is below freezing. Right now it is 15 degrees F and the car is a rocket. Why is this?



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