Underdrive pulleys
 

I have a 2k max. Would this mod be worthwhile, do we see any negligible hp increases? And do our accessories)ac,power steering, etc.) get negatively affected?

Your accessories will be fine. The main gains from underdrive pulleys is not that they turn accessories slower but that they weigh so much less. You might be looking at 5-8 hp and better throttle response. Underdriving the alternator may also help it last longer.

Have you found a place that sells them for our 5th gens? I went to unorthodox-racing but I didn't see any listed there. Any ideas???

Unorthodox has them for 5th and 5.5 gens.

I might be interested in this as well. It's coming on drivebelt and timing belt service time and that would give me the perfect oppertunity to install them. Keep us posted on your progress if you find them and install them.

I have an Unorthodox Underdrive pulley for sale if your lookin for one! U just got to buy the belt for it because it doesnt come with it anyways..! I took it off my 5th gen , it looks imaculate, here is a pic.

Shoot me a Pm if your interested! Just thought i would throw it out there!!

https://i24.photobucket.com/albums/c...DSC00278-1.jpg

If you're worried about under-driving the accessories, go stock diameter (Ultra Sc model if I'm not mistaken). I do not believe that they need a belt replacing and you'll still get the advantage of a ligher weight pulley. I plan on this in the future.

I have the stock diameter UR pulley and it definatly makes some power not a whole lot but its noticiable. The most noticable thing is how much faster the engine revs up now. I considered getting the underdrive setup but after searching found that its hard to find the correct size belts for it. Its a pretty cheap part and I think it's worth it I also found that I am getting better gas milage now too so thats a definate bonus.

My bad... when I searched before, I was looking at "pulley sets", which came back with nothing.

Here they are...

http://www.unorthodoxracing.com/sear...92&Category=-1

no timing belt, chain instead!
no maintenance req.

I got the unothodoxracing underdrive pulley on a automatic, and it did not feel any differents. My lights and gauges also dim at idel. I know im the odd man on this post so far, but i would not get it. Just my 2 cents

Sounds like you may have got the "underdrive" version and not the "stock size", correct?

The underdrive pulley and the stock size light pulley should produce the same horsepower i believe and the same gains, its just a preference of which version you like! maybe the difference is changing the belt.. and i guess depends on how much cheaper you can find it for?

Also if u look on the link u posted for the website, the underdrive pulley is still lighter then the Stock crank size lightweight pulley, which means the more lighter the more gain.!

I have been looking at getting the stock diamiter UR pully too. My worry is if I already have the 12lb flywheel wont I be taking to much weight off the crank? I think it will cause a vibration in the bottom end.

I used my UDP with my Fidanza Flywheel, no problems whats so ever, Actually my car would have amazing torque when take off and gets to the redline faster!!! Amazing!!