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A larger alternator pully would cause the alternator to turn slower. This is why these companies make them bigger for racing. This way your voltage output will be more nomal during high RPM operations. it also gives the engine a mechanical advantage over the alternator making it a bit easyer to turn ( I doubt you could measure gains on a dyno, but you never know). :wink:

One question though, How is the belt tensioned with the three pully setup? Do you have to shim out the alternator with washers or something. Now that I think about it, I don't know wich pully tensions the belt in the 4 pully setup either. Any light on this would be much appreciated...
 
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