Thread: Oil Cooler
View Single Post
      05-09-2012, 06:52 AM   #387
TimMc
Lieutenant Colonel
TimMc's Avatar
Australia
44
Rep
1,883
Posts

Drives: E90 M3
Join Date: Aug 2008
Location: Brisbane, Australia

iTrader: (0)

Quote:
Originally Posted by luster View Post
It's a straight swap, as the fans use PWM for speed control, not voltage. This means if the car says run @ 20% it will be 20% of possible power. 100% will be 100% of possible.

If it were voltage, it wouldn't be plug and play
Excellent!
I'm not sure why it couldn't be plug & play if it used a variable voltage input for speed control (feeding a transistor fed by the supplied beefier relay), but as stated above, this is well beyond my field of expertise. Pulse width modulation sounds like it would be much more precise than voltage modulation though.
The only issue I could foresee is that, if the car "knew" through coding that it had an 850w fan instead of a 600w unit, it may decide in a certain situation that it only needed say 80% of the 850w unit's speed rather than 100% of the 600w's. I don't see this as a biggee though, it will just cool things down a little faster.
Appreciate 0