New Trick flow Underdrive Pulleys

Its a tough concept Travis, but if you UD the crank pulley by 25%, then the stock alt pulley will move 25% slower. If you match the 25% UD crank with a 23% UD alt, it will spin about the same RPMs as before. I get full charge of the alt at just 750 rpms...

Ah I see. It makes perfect sense. Just was going off what I heard you know. What did you pay for your set?

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Originally Posted by bangbangskeetskeet

Ah I see. It males perfect sense. Just was going off what I heard you know. What did you pay for your set?

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Why are you ALWAYS thinking about men?????

I got mine for $220 plus $20 for the belt.

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Originally Posted by txarkitekt

Why are you ALWAYS thinking about men?????

I got mine for $220 plus $20 for the belt.

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Stupid iPhone likes to change words on me from time to time. :(

Where did you pick them up from?

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Originally Posted by txarkitekt

Its a tough concept Travis, but if you UD the crank pulley by 25%, then the stock alt pulley will move 25% slower. If you match the 25% UD crank with a 23% UD alt, it will spin about the same RPMs as before. I get full charge of the alt at just 750 rpms...

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not to get too technical but it would be:
an overdrive if its a smaller driven or a larger drive
an underdrive if its larger driven or a smaller drive

drive is crank
driven is wp/ps/alt

you have an underdrive crank pulley, and an overdrive alt pulley



i think

my head hurts

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Originally Posted by txarkitekt

Have you installed one on an LS motor? Sorry you had bad experiences with them on Ford motors....or whichever motor it was. But I would highly recommend them to people who have LS motors.

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Oh, they work well on F*** too, in my experience. I have the March aluminum 3-piece set on my Mustang (crank, water pump, alt), right when they introduced the Power & Amp series to correct low idle voltage (which it evidently did, never had a problem). I'm guessing I've had them on my car since '97 or so.