Alternator pulley question
Thread Starter
Melting Slicks
Joined: Oct 2010
Posts: 3,028
Likes: 794
From: Tollesboro Kentucky
Alternator pulley question
I tried to search for a definitive answer but never got a satisfactory one.I have a new alternator for my 2008 automatic.It doesn't have the decoupler on it but my factory one does.Have any of you eliminated the decoupler on an automatic without issues?I want to use the new one because it is chrome but I don't want to have problems.I thought the pullies may swap over but after searching it seems the shafts are different.Any info is appreciated!!
Burning Brakes
Joined: Oct 2014
Posts: 1,161
Likes: 84
From: Ohio
Take your chrome alternator back and buy the correct one. This: "An OVERRUNNING ALTERNATOR DECOUPLER™ pulley helps "synchronize" the belt drive system for improved engine efficiency, reduced Noise/Vibration/Harshness (NVH) and increased component life. When an engine accelerates, the alternator's mass creates resistance against the belt.
Automatic flywheels have much less mass than stick flywheels and the increase mass helps dampen the engines harmonics, NVH
Automatic flywheels have much less mass than stick flywheels and the increase mass helps dampen the engines harmonics, NVH
Le Mans Master
Joined: Apr 2013
Posts: 5,376
Likes: 1,118
After my stock alternator with the factory decoupler failed one day at the track, I replaced it with a Mechman billet alternator with a regular pulley and I’ve not experienced any problems with it. I spin my motor to just under 7,000rpm on every shift and I have a 10% overdrive balancer.
I don’t see the need for a decoupler in a high performance vehicle and GM must’ve built hundreds of thousands of automatic vehicles over the years without that contraption.
My recommendation would be to take the chrome alternator back and buy a Mechman. The best guy to get that from would be Bret Bradbury aka blownbluez06 on these forums.
I don’t see the need for a decoupler in a high performance vehicle and GM must’ve built hundreds of thousands of automatic vehicles over the years without that contraption.
My recommendation would be to take the chrome alternator back and buy a Mechman. The best guy to get that from would be Bret Bradbury aka blownbluez06 on these forums.
Thread Starter
Melting Slicks
Joined: Oct 2010
Posts: 3,028
Likes: 794
From: Tollesboro Kentucky
I appreciate the responses but I am unable to return it and have no desire to.One article says it is needed,next one says it isn't.If you haven't had any issues with yours that is real info.That is what I was wanting,first-hand experience.I will just install it and hope for the best.
Le Mans Master
Joined: Apr 2013
Posts: 5,376
Likes: 1,118
I appreciate the responses but I am unable to return it and have no desire to.One article says it is needed,next one says it isn't.If you haven't had any issues with yours that is real info.That is what I was wanting,first-hand experience.I will just install it and hope for the best.
Team Owner
Joined: Nov 2006
Posts: 21,136
Likes: 212
From: Long Island New York
I appreciate the responses but I am unable to return it and have no desire to.One article says it is needed,next one says it isn't.If you haven't had any issues with yours that is real info.That is what I was wanting,first-hand experience.I will just install it and hope for the best.
Thread Starter
Melting Slicks
Joined: Oct 2010
Posts: 3,028
Likes: 794
From: Tollesboro Kentucky
I’m facing the same situation as you did. I bought a 250a without a decoupler for my A6 06 about 6 months ago and haven’t swapped it on yet. Curious how you made out to see it I should go through with the install. Also purchased a Big 3 wire set to handle the extra amperage. Let me know please.
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Joined: Nov 2006
Posts: 21,136
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From: Long Island New York