I don't think an AC compressor pulley would come in handy unless you plan on racing with the AC on? As for an alternator pulley...I came across a friend with had to hold up the revs at the stop light to prevent the car from stalling?? perhaps with the a-market pulley the alternator couldn't keep up with the electrical demands of the car? I can't remember if he had an upgraded stereo though?

 

No benefit to be found here, I think.

 

I'd also worry about putting on an aftermarket alternator pulley considering that the power steering is electrical.

 

XTC at 9K is correct that you should not use an aftermarket crank pulley for the reason he discribed.This is the reason AEM does not make crank pulleys.

warning from AEM site states----
*IMPORTANT:
Vehicle manufacturers have thoroughly investigated the use of torsional vibration dampeners and conclude that their use significantly reduces NVH (noise, vibration and harshness). Furthermore, manufacturer and independent research shows that torsional vibration dampeners are critical to engine life where long-term use is intended. Removing the torsional vibration dampener from an engine can be highly detrimental to its long-term operation!

 

Ahh i read that too from the earlier threads, does that mean that my brother's 300zx bearings will go bad eventually because we are changing his crank pulley tommorow.

 

[QUOTE]Originally posted by KYS2000
[B]powersteering??? $hit how stupid am I apologies to

 

I'm guessing this concept applies pretty much to all cars. Unless, maybe if you decide to balance & blueprint your bottom end with the new crank pulley? This was just a "suggested" solution. In my opinion, if you take this route...the results won't be that impressive with the cost and amount of work involved!

 

I question the value of an under-drive AC pulley as well.

I believe that most cars disengage the AC clutch under full-throttle operation. (I think it used to be vacuum controlled, but the computer probably controls it based on the throttle-position sensor now.) So the AC is automatically turned off whenever you floor it.

As for steady speed highway driving, the I believe the AC compressor cycles on and off. It seems to me that an underdrive pulley would reduce the loss while the compressor is on, but cause it to be on a greater percentage of the time.

 

[QUOTE]Originally posted by RedY2KS2k
[B]I question the value of an under-drive AC pulley as well.

 

So judging from the deteriments of the changing the crank pulley, then it would be safe to say that the deteriments out weight any probably gains from changing it right?