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Old 02-23-2005, 02:01 AM   #1
Bliss
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Underdrive pulleys

I just ordered some UUC underdrive pulleys for my car. Ordered them from www.tunerworks.com

Which ones do you guys run? Any good/bad experiences? i know Thinair recommended the eurosport ones to me, but i dont think spending $100 more on pulleys is worth it.
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Old 02-23-2005, 03:58 AM   #2
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what does this do? and hey sent my stickers yet? lol
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Old 02-23-2005, 02:09 PM   #3
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Increases the diameter of the pulleys, reduces rpm on those components, ie: water pump. This frees up some hp(not add). Just a small, simple modification.

...and yes, your stickers were sent out Monday.
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Old 02-23-2005, 02:24 PM   #4
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they are worth it bruce... you wont regret it for 250.
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Old 02-23-2005, 02:38 PM   #5
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lighter weight pullies, and the concept of them is to underdrive your accesories to that you can free up more horsepower.
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Old 02-23-2005, 05:42 PM   #6
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I also heard that it increases throttle response, which is something importent to me
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Old 02-23-2005, 08:17 PM   #7
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I had UUC pulleys installed on mine.. well worth the money imo
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Old 02-24-2005, 03:45 AM   #8
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I always had a question or two for this underdrive modifications.

I understand that these pullies will be freeing some hps, but what about
its maintanance? Will you still be able to use the dealer spec belts? or
Do you have to get the specific spec kind of belts for the pully?
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Old 02-24-2005, 01:03 PM   #9
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Quote:
Originally Posted by mpower1226
but what about its maintanance? Will you still be able to use the dealer spec belts? or Do you have to get the specific spec kind of belts for the pully?
No maintenence aside from changing the belt at the regular intervals. No you can't use OEM belts, because the underdrive pulleys are larger in diameter, you need a longer belt. Not a big deal, they're still a standard sized belt, just not standard for BMW. If you go to Canadian Tire or any car shop with the size you'll have no problem getting another one.
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Old 02-24-2005, 01:12 PM   #10
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Quote:
Originally Posted by thinair
No maintenence aside from changing the belt at the regular intervals. No you can't use OEM belts, because the underdrive pulleys are larger in diameter, you need a longer belt. Not a big deal, they're still a standard sized belt, just not standard for BMW. If you go to Canadian Tire or any car shop with the size you'll have no problem getting another one.

ah.....so it is still standard automotive size..... Maybe I should look into this
underdrive pully. Is their a noticeble gain?
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Old 02-24-2005, 05:20 PM   #11
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I have a set of UUC on my car and you can feel a difference.

It feels like you just turned off your a/c.

The motor revs more freely less drag and when you have the a/c on barly notice the drag.
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