hi iam going to get a under drive pully and i need some online instructions on how to install it also exsactly how it works i now it takes stress off the engine by slowing dow the rotation but whont that mess up the timming i need a explination on what it dose and how it works thank you verry mutch

Here is install instructions: http://seangordon1.tripod.com/UDPinstall.html (courtesy of vegasdsmr)

Basically, it reduces rotation mass (by reducing the size and weight of the pulley). The pulley doesn’t turn the timing belt so it will not affect it.



Eric Madden

There is a lot of info on this question, check the archives. I'm sure you will find all the info there.

-97 GS (First project, 299 whp)(sold)
- 97 RS 2.6 last numbers: 306hp, 352tq @16psi (Dead, parted out)
- 99 GS OZ, Hahn Kit, 56k miles (Sold)
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- 00 Nissan Maxima GLE (Daily Driver)
- 02 Audi A4 1.8T Quattro