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Old 05-06-2013, 03:18 AM   #1
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Underdrive pulley recommendation

I'm wanting to get an underdrive pulley for my 2.5. I've been looking at a few but was wondering if anyone could make my mind up for me. I've looked at the precession chassis works pulley and Chetah online pulley. I've seen another pulley that looked a bit weak and for sure found pics of it broken. If there's any others people could recommend it would be most appreciated.
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Old 05-06-2013, 11:40 AM   #2
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what type broke? I've done little research but RSS looked lightest to me. I'm probably going to try using 987 idler pulleys as well as I've read here that there aluminum.
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Old 05-06-2013, 01:59 PM   #3
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RSS seems to be the popular pic here.

Beware of BBI pulleys. They have a tendency to do this:

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Old 05-06-2013, 03:47 PM   #4
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I've decided to go with tarett engineering. Looks strong and the price seems good at $175.
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Old 05-06-2013, 03:51 PM   #5
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I would go with either Tarett or RSS, you can't go wrong with either one
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Old 05-06-2013, 05:08 PM   #6
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I installed the RSS UDP. Worked great. You can also buy the smaller/correct size serpentine belt at the same time.

RSS Under Drive Pulley for Porsche Boxster, Cayman, Carrera, Targa

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Old 05-06-2013, 05:48 PM   #7
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I purchased the tarret. It came with a new bolt which is recommended regardless of which brand you choose. Also, I think the Tarret is a 4" pulley, whereas some of the others are 5". I am not sure what this means in terms of performance. Would be good to know .
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Old 05-06-2013, 06:04 PM   #8
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Quote:
Originally Posted by Stroked & Blown View Post
RSS seems to be the popular pic here.

Beware of BBI pulleys. They have a tendency to do this:

Yikes ! I have the BBI LWUP !
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Old 05-07-2013, 03:11 AM   #9
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Smile

I have just fitted this one, bbi.
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Old 05-07-2013, 03:47 AM   #10
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Quote:
Originally Posted by rah rah 986 View Post
I purchased the tarret. It came with a new bolt which is recommended regardless of which brand you choose. Also, I think the Tarret is a 4" pulley, whereas some of the others are 5". I am not sure what this means in terms of performance. Would be good to know .
All the ones I saw when I did mine were 3". Didn't matter the brand, price, or what milling of the body looked like... They all had a 3" diameter.
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Old 05-07-2013, 06:51 AM   #11
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Quote:
Originally Posted by thstone View Post
I installed the RSS UDP. Worked great. You can also buy the smaller/correct size serpentine belt at the same time.

RSS Under Drive Pulley for Porsche Boxster, Cayman, Carrera, Targa

Had to go with RSS because of it was too important to fail.
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Old 05-08-2013, 10:17 PM   #12
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stupid question maybe, but how are UD pulleys not universal? I can see cam diameter varying in sizes, but there should be a lot of UDPs that fit the box, that does not make you pay the premium...
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Old 05-09-2013, 04:07 AM   #13
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To those of you that have installed a UDP... What real difference have you seen.... and if one of you that trolls looking for an opportunity to scold me for not using the search function - please don't... If you have no other response - no need to respond.

I was just reading this an was interested.

Pup

Sorry guys, but sometimes that Use Search Function spanking , gets to me.
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Old 05-09-2013, 04:27 AM   #14
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Pup.
They were first developed with the purpose/idea to simply slow down the accessories (power steering pump, alternator, AC compressor) on a car that spends a lot of time running high revs. 986/987 PS pumps are known to overheat and leak under heavy track use.

A side benefit is that the underdrive pulley reduces parasitic drag from these components and you can measure an increase in hp and torque at all rpms between 5-10 rwhp depending on the model.

Don't have one myself (yet) but only heard good things!
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Old 05-09-2013, 04:50 AM   #15
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stupid question maybe, but how are UD pulleys not universal? I can see cam diameter varying in sizes, but there should be a lot of UDPs that fit the box, that does not make you pay the premium...
There are more variables than it may seem, besides diameter; bolt size, number of bolts, bolt circle diameter, pulley offset, center hole size, keyway/pin size & location, V-groove width/depth (this may be fairly standard?), etc.
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Old 05-09-2013, 05:01 AM   #16
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Good monring gentlemen

Being that we are all having a nice friendly chat about UDP's - how easy is it to change/install.
Not looking for a full blow by blow account but can a fairly unskilled person do it or does it require a higher level of knowledge and does half of the interior need to be removed or can access be gained with seats and console in place.
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Old 05-09-2013, 07:55 AM   #17
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don't worry chaps.
Done some searching and have my answers, just need to find the cash!
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Old 05-09-2013, 08:38 AM   #18
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Thanks Essex for the info....

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Old 10-11-2013, 09:04 AM   #19
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Anybody install Pedro's pulley? Most seem to recommend RSS. Any pluses or minuses for either one?
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Old 10-16-2013, 08:55 AM   #20
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My Pedro UDP came in yesterday. As soon as get a minute to install this puppy I'll let everybody know what's up.
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