I dont know if this is true...but i heard the UR pulley aren't exactley the best thing for the engine..they put alot of wear on the engine or something....anyone know...or could explain this to me...im been very skeptical about this buy...only 300+$ for such a good gain with alot of other mods...i dunno if anyone could explain the logic and what these might do for my car...i might be more prone to buying them....also whats the required time of install on these??? and how expensive would it be to install on a 5at if that matters.....

Ben

 

I heard that they are good for low end gains, but they cut off your top end power. like, your over 130, 140 power.

 

This has been discussed in great detail. One recent thread:

https://my350z.com/forum/showthread....threadid=73307

Do a search and you find a bunch of discussions regarding the issue.

 

There should be gains throughout the rev range and there should be no reason why they would cut off your top end power. Unlike intake and exhaust mods that vary in their effectiveness at producing additional HP at different rpm's (usually in the upper ranges), the UR pulley's reduce rotational weight reduction is constant across the board.

I've done 2 blackstone oil analysis with the UR pulley and an HPDE. My lead levels (bearing wear) are lower than the universal averages. Take it FWIW. http://www.g-owners.com/pic_display.asp?id=734

 

Great info,

Someone should start a thread about UR crank pulley long term experiences.

I have 3500miles on it and engine runs smoother than ever. COuldn't be happier.

 

got mine from concept Z for 230 including new belts. belts squealed at first after the initial stretching, but it's gone away after I tightened them.

the car has been running great for a month, with 2500 miles on them.

why would a mod with relatively noticable gains could only cost $300?
... well, it's just a pulley.

 

Most of the gains are from the crank pulley from what I understand.

 

20K and 8 track days on mine. No problems.

 

I'm installing my ur set this thursday... hopefully I won't have any problems...

 

hmmm.....so no real long term problems as of yet....i just heard they aren't great from someone...i cant remember....i should have asked them to get the real details....but from what it sounds like you do get some decent gains form them...but you lose high end power around 130-140mph??? is that what you guys were talking about??

Ben

 

There is a long thread from a while discussing the pros vs cons. You'll have to make up your own mind. Many of the VQ30 Maxima guys are running pulleys (and have been for years) w/o incident. No one knows for sure on the VQ35 but so far no problems have surfaced (granted these problems may not surface for a while).

Go back and read the old thread- it has some really good info from both sides.

 

It has been answered already! Pulley gains are due to less rotational mass, gains are consistent through all the power curve. Why would it change depending on the gear you are in???????

 

thank you.

 

28k miles without incident. I hvae used an UR pulley on everycar I've owned where it was offered, and the results were always noticeable, seemless and caused zero problems.

There are some cars that you simply cannot put a pulley on without balancing the entire bottom end of the motor (inline 6), but teh VQ, with its very short crank, is not one of those motors.

Use it and have fun!

 

actually do you guys have the pulley set or just crank pulley?
like those of you without problems....

i installed my crank only last month

 

I have the whole set (UD and crank)

 

for those that have just the crank, wouldnt that present a problem because the lightened crank would spin faster than the other two pulleys?

 

the other pulleys are not driven, thus they only spin as fast as the crank pulley drives them.

as long as the teeth are the same size (which they are)... that's the whole point of an under drive set, if the driving gear is smaller, it requires more revolutions to turn the slave gear the same about. But since the driving gear (the cam gear) only goes as fast as your engine, then the rest of the gears must move slower.

QED.

 

crank only here

 

The discussion was about harmonics or something like that being bad for the crank bearings last time.

I have the UR full set...I've had UR pullies on my Integra, Stang GT (the stang might have been a different company actually..but it worked fine) and Maxima...with no problems.

There were some "engineers" and people who "heard of engine failure from mechanics" etc etc saying they're bad.

However everyone who's running them seem to have no problems at all. Take it for what it's worth. I love mine.