hey guys just wanted some suggestions. i was looking into get a UR lightweight pulley. People who have it, how do you guys like it? any particular type i should get? any problems wiht it? thanks for your help

 

Interested as well

 

bump

 

Do a search of "DaveB" and "UDP" and you find a lot of information about the +/- of adding a UDP to the VQ series motor and removing the factory crank damper pulley.

https://g35driver.com/forums/engine-...ck-please.html

 

After reading all 6 pages I conclude there isn't a right or wrong answer on this and it will continue to be debated....I agree this theory came from the stang crowd after owning 3 of them and reading/working on them..with that said I don't think you will get any hp out of it but there is less rotational mass to move which should allow the engine to rev quicker..weight reduciton for your engine.

 

im thinking of getting a UR stock diameter crank pulley. this will not underdrive anything, and probably the safest imo

 

The reduced mass will indeed equate to an increase in hp. True, it does not change how much in generated by the combustion process, but since hp is always at the crank or the drive axles the mass reduction will measure as an increase in hp.

With that said, there is no way I would remove the damper from my motor with out seeing an analysis on the effects on the crank harmonics. This is one area that engine designers put a ton of study. No way am I going to trust an aftermarket company without seeing real test data. I am willing to bet that at best, all they studied was the torqued the pully must withstand and then made it strong enough to take that. I seriously doubt that spent one minute on studying the effects of the lack of the damper. They probably put one on a car. Drove it hard and said everything was all good since nothing broke.

 

That's what she said.

 

I can see this thread going downhill in a hurry....

 

for 2-3 hp? not worth it to me..probably gain more hp if i lost weight...

 

Interesting threads.

I now know of two people that had the key way problem on light weight crank pulleys.

 

whats a "key way" problem??

 

The key slot on the pulley that slides over the crank "key" breaks, the pulley free-wheels, totally unbalances the crank, your motor goes boom.

 

scary

 

I have the UR pulleys on my car for about a year and had no problems with them. After reading some of the stories on here I may go back to stock, but its a bitch to get on and off.