UD pulley
 

What kind of gains would you expect out of an underdrive pulley?


heres one I was looking at

http://www.vmptuning.com/store/index...d=91&parent=46

RE: UD pulley
 

there are mixed reviews about the UDP. you should be expecting a 5hp-10hp increase if you install. the downside is to some it can be a hard installation, some said that they haven't had any increase in power, and some said that the power comes on 30 minutes after you start your car and the worst i've heard is that some of them have caused damage to the motor, but i'm sure that's on rare occasions.

im probably still going to get a UDP though. i'm still researching on which is the best and so far i think motoblue would probably be the best one. ADP is the cheapest, that's also something to consider.

RE: UD pulley
 

PITA install. takes forever, and you have to get the right tools (may need an air wrench to break the pulley free). I wouldn't bother, and besides, many of the people on the forums have had alternator failure issues after installing.

RE: UD pulley
 

dunno if it really gives you an increase, never dyno'd the car...i can see where the idea of reducing the accessory drive would free up power but im not swearing to it or at it at the moment. been on about 6 months and no alternator/overheating/etc.problems either so dont be scared to do the crank udp.

RE: UD pulley
 

did you install it or did you have a shop install it? if you installed it, how'd it go? and if a shop did, how much was the install?

RE: UD pulley
 

i got a shop to install mine, it took an hour. you shoudlnt worry about breaking anything with the crank pulley, the alt pulley can and probably will break your alternator

RE: UD pulley
 

I did the Alt pulley, works nice and it was a 15 minute install. No breakage on the alt it still works fine. I got it used for $75 and am happy with the performance I've gotten. Pauls high performance in Michigan sells them. Cheaper than the crank pulley too.

RE: UD pulley
 

The crank pulley has been shown to give you 4 to 6 RWHP... a far cry from the claimed gains... Also I found that the recommended belt was to long. It ended up rubbing on my alternator cover which covered everything is rubber dust and messed up my painted cover... also found it slipped a bit...

RE: UD pulley
 

i found the website. do you knowhow much does he sell them for?it doesn't list the alt pulley on the site. would i have to call them?

RE: UD pulley
 

Ya I had to call them for the belt size when i replaced it. I asked them then why they don't have it listed he told me they are working on it. Nice people and good service just probably not the most CPU literate people.....lol
GOOD LUCK!