You can install the pulleys in about a hour on an MT car, AT cars require a special tool from the Dealer. The hardest part is getting the crank bolt broken loose.

 

do the headlights dim or the a/c run warm at idle with the UR pulleys?

 

My headlights don't dim and it hasn't exactly been warm enough here to run the AC as of yet

 

UR crank pulleys dont have a harmonic balancer like the stock pulley, so there is going to be more vibtartion and wear on the motor, ive heard and seen bad things happen to cars with UR pulleys.

 

 

if i have a stereo in my car would this effect it. Is the crank pulley also what powers the alternator?

 

so who is right here?????

 

I would say vash350z is wrong simply based on the fact that he did not refer to the VQ specifically in his motors statement, has 50 posts and I would conclude that it means he has not read the other threads regarding the VQ being ok with pullies. Just IMO. I don't have pullies yet but I am thinking about them.

 

to my knowledge,, the Z's crank is internally ballanced / dampend...

 

We have talked about and covered all this crap before. The stock pulley does have a rubber isolator but one of the reasons it needs it is because it is so heavy! It is cheaper to manufacture and mass produce a steel and rubber pulley than a light-weight aluminum one. Possibly that is why Nissan didnt take the lightweight pulley approach.

Bottom Line is it is probably better to have the stock pulley, but I dont think the UR pullies are more likely to wear out our engine than the lead foots we all posess!

 

Does the stock pulley incorporate a harmonic balancer? I presume that the UR pulley has been balanced.

 

Yes No.

The stock pulley has a harmonic balancer. (If a rubber isolator can be called a harmonic balancer)
The UR pulley does not. it is a solid machined piece of aluminum.

 

What tool does the 5AT require? I did not need a special tool to install my pulley set myself in my garage with my 5AT. There is a trick to installing the Crank Pulley on the 5AT and I posted that some time ago. The same may apply for 6MT cars as well and would not require someone else being present to step on the brakes, but I have not been under a 6MT car to see if the same applies. The only differences I noticed are all positive. The car revs a bit faster (is more responsive) and with the 5AT the shifts seem to happen a little faster/smoother. There is no problem with the heater, stereo, lights ...... No vibrations or anything of the sort. The only downside I can think of is that when slowing down I have to use the brakes a little more because the engine doesn't slow me down as much on its own (this is noticeable but not staggering).

 

Awesome that you say this. This is how I feel about the flywheel I put in. Some people really disagree with me on it but I agree with you. The pulley does the same thing as a flywheel but to a lesser degree. I knew I wasn't crazy. Also, this has been verified by another Z owner. Lightening the drivetrain does not exactly increase engine braking. I think it lessens it.

 

If you are In the DFW area, Call Brice @ Alamo Autosports, He Quoted me $500 installed for the Pully set. So just the Crank might be cheaper.

 

In my opinion, what happens is that the rpms jump faster and higher(because of less engine breaking) when you downshift with the pulley or flywheel on. Less resistance due to the difference in weight on the crank. It is the same as acceleration. Some may think that the extra weight helps to keep the rotational mass going, but this only applies when the transmission is not engaged. When the transmission is engaged, then the speed of the car will turn over the engine. With less resistance on the crank, the engine will not slow the car down as fast. This is my opinion on the matter.

 

Installing the Crank pulley on the 3rd. Does anyone know the actual weight of the stock pulley versus the UR Ultra S pulley? I will get mine on the 2nd, and plan on weighing both.

 

I believe it is 7.5 pounds stock and 3-4lbs UR crank. Loook for max HAxs post on UR pulleys. Youll find it!!