Basic bolt ons: Underdrive Pulleys - Focus Fanatics
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Old 02-22-2004, 10:51 AM   #1
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Basic bolt ons: Underdrive Pulleys

The theory of the underdrive pulley is simple. They underdrive or spin your engines accessories slower so as to free up some rotating mass from your engine. In most cases they are much lighter than the stock pulley.

Some of the more common underdrive pulley kits you will see out on the market are:

Esslinger
Ford racing
Focus central
Focussport
AFX
AEM

The ford racing and esslinger UDPís are the same, they are made for Ford racing by esslinger.

The focus central UDP kit also includes a water pump pulley that is color matched and made of the same lighter weight aluminum.

The AFX UDP is said to be smaller than all the rest therefore underriving the accessories a bit more.

One is no better than another per se. The prices run in range from $ 89 - $ 125

If you have a question about one of these parts or another related exhaust part, feel free to PM me or e-mail me at frzx3@yahoo.com


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Old 02-24-2004, 04:17 AM   #2
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i dont honestly know if the focus central water pump pulley is any lighter than oem. the fc water pump pulley is huge!
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Old 02-24-2004, 05:27 AM   #3
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it is bigger to make up for the size of the smaller crank pully
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Old 02-24-2004, 12:13 PM   #4
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thanks captain obious! j/k

im just sayin its probably not lighter as one would assume from readin that first post. just dont want anyone coming here thinking if they put on just the water pump pulley that they will make powerrrrrrrr
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Old 02-24-2004, 04:00 PM   #5
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No they will not make power with a water pump pulley, it is just functional so as to keep the stock belt.
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Old 02-25-2004, 08:43 PM   #6
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I just received my AFX UDP......what should I expect as far as my every day drivebility......Like: heating/cooling air, cd player and others?........am I going to sacrifice something compared to the OEM?......

It's late...I know it's a stupid question........

Peace........
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Old 02-26-2004, 12:02 PM   #7
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You shouldn't really sacrifice anything, I hvae had mine on for 35k miles and never had any issues with it.
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Old 02-26-2004, 04:25 PM   #8
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Cool.....I just installed it and I have couple questions:
  • The engine now seems to be doing kind of an up and down noise....which is probably due to the new pully but did you feel the same difference at first?.....compared to the OEM one....

    I had to change my idle with the screw because of the new lag...it seemed the engine was like "coughing" at idle......Is this ok too?

    Now, it seems that when I pull the car up to 4000 or 5000 rpm....and then shift gears......they're a sound of like something still spinning on the side where the udp is......That one normal too?

Since I left it to a professional wanted some feedback to see if everything was cool...........

Peace..........
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Old 02-26-2004, 04:39 PM   #9
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First off, did he shave the cover behind the crank pulley? The plastic cover needs to be shaved or it will rub.

If you unplug your battery there should be no idle change.

You should not touch the idle screw.
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Old 02-26-2004, 04:41 PM   #10
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I guess he did not do any of these.....should I unplug my battery now or is it useless??

Thanks Focal

Peace.......
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