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Old 10-23-2014
zbott93's Avatar
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I am: Zach
Join Date: Oct 2014
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underdrive crank pulley

Where can i buy an underdrive crank pulley? I know DZK used to sell them but I can't find one of those. Where else can I get one? and are they worth the money
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Old 10-23-2014
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I am: Ron Dean
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On a 3.0l, no, really not worth it, even on a stock V8 it would be marginal.

Underdrive pulley will free up some horse power, about 3%, probably closer to 2% under 250HP
On a stock 5.0l V8 that would be about 7HP, 220hp x .03 = 6.6hp
On your 3.0l rated at 180HP it would be 5.4HP

The claims of 10 and up HP increase are true but for higher HP engines, it is a percentage, not a straight increase
350hp x .03 = 10.5hp

The downside is alternator pulley may need to be changed if you do alot of idling, i.e. stop and go traffic.
And power steering might not work well under 1,000rpms, i.e. parking lots.

Electric cooling fan might be a better start, it frees up a few HPs with no real down side, except cost, but undersize pulleys are not cheap either.

Look at summit racing they have a large selection of underdrive pulleys
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Old 10-24-2014
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I am: Charles B
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$100 plus a belt

They are worth the money. Perhaps not from a peak horsepower perspective. In terms of responsiveness and general change in nature of the engine underdrive crank pulley is one of the best budget mods I've experienced and I've done a few.

This is what I wound up with in NA trim (comprised of throttle body, maf, intake manifolds, under drive pulley and custom sct flash). All induction noise, stock exhaust.

I suspect an auto would lessen your experience with under drive pulleys (I don't know that for sure).

In that case perhaps you're better off in first investing in a flash tuner (sct or the like).
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Old 10-24-2014
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I bought mine (for 4.0L) from Underdog (no longer in business if I recall correctly). I also installed a Taurus E-fan. With either one you MIGHT notice minimal gains in responsiveness but it's nothing substantial. I ended up developing a bad belt squeal and removed the e-fan and went back to the stock fan. Either way I went with the under drive pulley because my stock crank pulley had this metal ring thing separate inside and rattle a lot, so I figured while I was replacing it I might as well try out the underdrive pulley for not too much more at the time. Can't recommend it, because it's not a significant enough gain, but it definitely won't hurt if you need one to try it.

2004 Ranger Edge 4x4, 4.0L SOHC, 4.10's, Black, Step-Side Bed, Quad Cab, 3" BL, Explorer Leafs, Underdrive Pulleys, Flowmaster 40 SI/SO, Mustang GT Disc Brake Swap, Raammat Sound Deadener, STX/Sport Grille,
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Old 10-27-2014
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I am: Kevin
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How does a belt squeal tie in with the E-fan? Puzzled as to why you removed the e-fan because you developed a belt squeal.
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