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Old 05-11-2005, 02:31 PM   #1
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Question Just lookin for an answer :)

Does any one know why the engines fans shut off at WOT. Ive heard that the HVAC shuts off too, but I tried to verify and i could not get it to shut off, however i did witness the two front fans shut off. Why???


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Old 05-11-2005, 02:36 PM   #2
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Less draw on the alternator??
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Old 05-11-2005, 06:57 PM   #3
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I had heard that the CPU kills the clutch on the AC compressor during WOT. The fan etc. still work, but from my understanding when the clutch is engaged and turning the AC compressor that can rob ~15 hp.
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Old 05-12-2005, 09:21 AM   #4
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damn that much Hp lost. I'll keep muh windows down thanks. What about the fans?
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Old 05-12-2005, 12:26 PM   #5
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Less parasitic power loss because of the extra draw on the motor. You don't really need the fans at WOT anyway because there is enough air going through the grill to keep the motor cooled down. It is that way on most cars that are newer than about 2003 I think.
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Old 05-12-2005, 03:03 PM   #6
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My 89 probe would not charge at wot, if you were givin er for a long time you would notice the charging needle slowly dropping, as soon as you let off it would charge. Good idea seeing as how much they charge not at wot. The alternator pulley on the 2.3 is like a clutch, it lets the alternator spin after you shut the engine down.
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Old 05-12-2005, 03:05 PM   #7
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moving to get car chat....
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Old 05-12-2005, 03:12 PM   #8
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The alternator pulley on the 2.3 is like a clutch, it lets the alternator spin after you shut the engine down.


sorry.. your mistaken here. It would serve no purpose to turn after the engine shut off. For one, the field winding isn't energized once the key is off.. so no power could be generated. And think about it.. if the alternator robs power when it is charging, don't you think it would come to a compleat stop instantly if it wasn't driven by the engine?


So Gizmo... how did you determine that the fans turned off at WOT, and live to tell about it???
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Old 05-12-2005, 04:17 PM   #9
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actually you go under your hood and pull the throttle cable to rev the engine by hand. You will hear the fans turn off and then turn back on after the engine idles back down.
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Old 05-12-2005, 04:45 PM   #10
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Quote:
originally posted by stpower
The alternator pulley on the 2.3 is like a clutch, it lets the alternator spin after you shut the engine down.
Quote:
Originally posted by vanace
sorry.. your mistaken here. It would serve no purpose to turn after the engine shut off. For one, the field winding isn't energized once the key is off.. so no power could be generated. And think about it.. if the alternator robs power when it is charging, don't you think it would come to a compleat stop instantly if it wasn't driven by the engine?
Some Mazda engines (I will have to do some research to figure out exactly which ones) absolutey DO have overrunning clutches on the alternator. The purpose is to save wear on the alternator bearings caused by rapid changes in engine rpm. Consider that the alternator is driven at roughly 2.5 times engine rpm. A gear change that instantly drops engine rpm from 4K to 2K will force the alternator to instantly change rpm by 5K, which causes all sorts of stress. This is a purely mechanical issue, has nothing to do with field energization, whether the alternator is working electrically or not.

The alternator stator is relatively massive, and no, it does not/cannot come to a complete stop instantly because it has a lot of inertia.
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