# underdrive pulleys

**URL:** <https://forums.speedlife.net/t/underdrive-pulleys/142238>\
**Category:** Canada Nissan Automotive\
**Created:** [April 16, 2006, 1:29pm UTC](https://forums.speedlife.net/t/underdrive-pulleys/142238 "2006-04-16T13:29:58Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![TravyPoo](https://avatars.discourse-cdn.com/v4/letter/t/838e76/32.png) [@TravyPoo](https://forums.speedlife.net/u/TravyPoo)\
**Post date:** [April 16, 2006, 1:29pm UTC](https://forums.speedlife.net/t/underdrive-pulleys/142238/1 "2006-04-16T13:29:58Z")

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what do you guys think of underdrive crank pulleys? I am thinking of buying one for my KA24DE. are they worth the money?

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**Author:** ![baker\_jeff](https://avatars.discourse-cdn.com/v4/letter/b/0ea827/32.png) [@baker\_jeff](https://forums.speedlife.net/u/baker_jeff)\
**Post date:** [April 16, 2006, 1:33pm UTC](https://forums.speedlife.net/t/underdrive-pulleys/142238/2 "2006-04-16T13:33:37Z")

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I made a poll on 780tuners about this issue. Half are convinced it’s terrible for the engine, half are all for it. I don’t know what to think just yet.

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**Author:** ![TravyPoo](https://avatars.discourse-cdn.com/v4/letter/t/838e76/32.png) [@TravyPoo](https://forums.speedlife.net/u/TravyPoo)\
**Post date:** [April 16, 2006, 1:37pm UTC](https://forums.speedlife.net/t/underdrive-pulleys/142238/3 "2006-04-16T13:37:22Z")

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besides slowing down the PS pump and alt. slightly i couldnt see it hurting anything. :roll:

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**Author:** ![RS13](https://avatars.discourse-cdn.com/v4/letter/r/46a35a/32.png) [@RS13](https://forums.speedlife.net/u/RS13)\
**Post date:** [April 16, 2006, 1:39pm UTC](https://forums.speedlife.net/t/underdrive-pulleys/142238/4 "2006-04-16T13:39:15Z")

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They are bad if you remove a harmonic ballencer.

Our engines are ballanced internaly so there is no issue with using them.

That is the big debate.

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**Author:** ![PyreXXX](https://avatars.discourse-cdn.com/v4/letter/p/bbe5ce/32.png) [@PyreXXX](https://forums.speedlife.net/u/PyreXXX)\
**Post date:** [April 16, 2006, 9:34pm UTC](https://forums.speedlife.net/t/underdrive-pulleys/142238/5 "2006-04-16T21:34:18Z")

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On my Spec V, which is also internally balanced, I have a crank pulley. You’ll notice a difference in the revving ability of the car. It isn’t a huge power gain, but it makes it a shitload easier to rev match downshifts.

It’s worth it if you can get it cheap enough just for the daily driving convinience of the rev matching!

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**Author:** ![TravyPoo](https://avatars.discourse-cdn.com/v4/letter/t/838e76/32.png) [@TravyPoo](https://forums.speedlife.net/u/TravyPoo)\
**Post date:** [April 17, 2006, 9:10am UTC](https://forums.speedlife.net/t/underdrive-pulleys/142238/6 "2006-04-17T09:10:56Z")

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I heard the crank pulley is good for at least 8 whp for the KA…but for 250 $ :roll:

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**Author:** ![Nis240](https://avatars.discourse-cdn.com/v4/letter/n/a9a28c/32.png) [@Nis240](https://forums.speedlife.net/u/Nis240)\
**Post date:** [April 17, 2006, 10:08am UTC](https://forums.speedlife.net/t/underdrive-pulleys/142238/7 "2006-04-17T10:08:40Z")

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> [@TravyPoo](#):
>
> I heard the crank pulley is good for at least 8 whp for the KA…but for 250 $ :roll:

If your gonna get one just get the Ebay ones, they are alot cheaper.