Re: Underdrive Pulleys - April Purchase
Yep, once you load an alternator up it gets very hard to turn, have a look at portable generators and the size if the donks they put on them. The dyno knows all, but all the dyno reports I have seen are post underdrive and pre alternator pulley change. The main plus from the underdrive pulley is at high revs, the minus is at idle. At idle is when you need the alternator to spin well the most, thermos etc. How much time does your car spend at either end of the rev range? mine spends 95% of it's time between 900-2500 rpm with the odd peak up to 4500 rpm. 250kw is great, but if it's at 6000 rpm what good does it do you?
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