OK, I'll try to keep this short, so here's the deal. I recently got my car running again ('95 Camaro, LT1) and it has a new ATI SuperDamper, the 10% underdrive version. Years ago I had installed on the original engine a 2-piece underdrive pulley kit, consisting of a 25% underdrive crank pulley, and a 25% overdrive alternator pulley (I wanted to keep the charging output unchanged). So, on the new combo I have a 10% underdrive crank pulley, and a 25% overdrive alternator pulley. Obviously, the alternator is turning much higher RPMs than stock. So, the question is, will the higher RPMs hurt the alternator? Is overdriving the Alt costing me more HP than the small amount the 10% underdrive crank pulley is freeing up? The engine will never spin above 6500RPM, but will the alternator handle the increased RPMs it is now forced to turn? Finally, this may be unrelated to the alternator, but I now have a distinct "belt whine" type noise, it absolutely sounds like there's a blower under the hood (no blower, just N2O). I have installed a new Gatorback belt and also replaced the tensioner with a new factory unit, since when I got it running there was a very loud belt "squeak" every time it shifted gears. The squeak went away, but the "blower whine" was un-affected. Is it possible the noise I'm hearing is the alternator being overdriven too much? It was also rebuilt before being installed, so the bearings, etc should be fine.

PS Sorry it was so long, but I wanted to be thorough

 

get a mechanics stethescope to find the noise. They are only a few dollars

 

Yeah, thought about that, but just like a blower the whine only becomes pronounced over 3500-4000RPM, just didn't want to spin the engine that high yet, it's only got 150 miles on it. Any opinions on the alternator overdriving issue?