Thanks sd_boxster! - 986 Forum - The Community for Porsche Boxster & Cayman Owners

backman_z · 07-30-2010, 11:41 PM

I would like to publicly thank sd_boxster for his write up on installing an underdrive pulley. Great write up.

Underdrive Pulley Install Guide

My pulley arrived today. After an evening with some friends (watching Gladiator and drinking a couple beers), once they left, I ended up starting the project at 1:00 AM. It only took me about 1 hour 40 minutes thanks to sd_boxster.

The only thing I did differently was to use a screw driver head instead of his leverage contraption. I put the screw head through a hole in the stock pulley, and into the boss (see pics). This held the stock pulley in place while I loosened it.

http://www.flickr.com/photos/backman_z/4845265417/
http://www.flickr.com/photos/backman_z/4845884042/

My pics do not seam to be showing up, so I will post the pic url.

lbrown2009 · 07-31-2010, 06:37 AM

post install have you noticed any difference in responsiveness?

backman_z · 07-31-2010, 09:00 AM

I'll have to get back to you on that. I am home with 2 kids, while my wife is away. I can't really take both kids (4 years old- both) for a ride in a boxster.... Another reason to do the install at night while they are asleep,

lbrown2009 · 07-31-2010, 12:05 PM

bought mine from brad roberts a few months ago and never got around to installing it, I notice 3 things on mine 1) the car is seems quieter(eerily quiet) 2) the responsiveness has diminished 3) battery is charging exactly the same as it was prior to install high 13.8- 14.0 range. not sure what to think about this part but we followed the install directions to a T(grinded that nub on the block down real good) I didn't change the belt as it looks in very good condition with almost no wear. I need to put this car on a dyno and see what it has or doesn't have. 2.7 50k miles

AndyA6 · 07-31-2010, 01:23 PM

Responsiveness diminished?? I don't understand this point.... should be the other way round.

I have underdrive pulleys on my other cars and it always improved.

backman_z · 07-31-2010, 02:42 PM

Sorry lbrown2009, if forgot to answer your question.

I got a 4" pulley from amondc who is a member of this forum. The soonest I expect to be able to give feedback is Monday. Unfortunately, I doubt that I will get a chance to drive it before then.

Boxtaboy · 07-31-2010, 03:15 PM

Quote:

Originally Posted by lbrown2009

bought mine from brad roberts a few months ago and never got around to installing it, I notice 3 things on mine 1) the car is seems quieter(eerily quiet) 2) the responsiveness has diminished 3) battery is charging exactly the same as it was prior to install high 13.8- 14.0 range. not sure what to think about this part but we followed the install directions to a T(grinded that nub on the block down real good) I didn't change the belt as it looks in very good condition with almost no wear. I need to put this car on a dyno and see what it has or doesn't have. 2.7 50k miles

I thought that you had to use a smaller belt due to the size differential of the pulley.

lbrown2009 · 07-31-2010, 07:16 PM

when I originally bought the pulley I asked the manufacturer about changing the belt and they said no it doesnt need to be changed, I have read many threads on it while waiting to install it and some people said they used a slightly shorter belt and someone said they bought a shorter belt and it didn't fit so I left well enough alone and kept the original. It is working fine, spins without a problem as we started the car without the firewall on just to make sure. I can't say 100% if it's gained or lost power, but from the feel of it and I've been driving it for 9 months now ... I think I lost something yesterday. Would a shorter belt make a difference? anyone?