I keep hearing that UR pulleys are the best than most other brands on the market.... However... is it really neccesary to purchase all three.... from what i understand the crank pulley is the main one.... Is it possible to only purchase that one pulley with a stronger belt??? If so what gain can i look forward... will i even feel a difference.....

 

the main crank pulley is all your gunna need performance wise. Yeah...UR is the one. You'll notice immediate gain in throttle response for sure.

 

great.... is there a difference from the lightweight pulley and an underdrive pulley.... some guy told me that there was but i'm pretty sure it's the same one......

 

Just an FYI: Most after market pulleys don't have dampeners built in, so they could shorten bearing life.

 

go underdrive if your not going the turbo/supercharge route in the future.
Make sure the installation is done correctly to avoid damaging the crank seal down the road. i've had mine for over two years and no issues whatsoever.

 

FYI: I found out the other day when I ordered my UR pulleys for my 07 350Z, well, the 03-06 dont fit the 07. I sent them pics of my 07 and they will email me when they have a set for it.

 

Hey Noob, neither does the stock pulley. Don't misguide others because you think you know what you're talking about.


Stick to the mods that you know about, floor mats, oil cap and license plate frame. I'm sure they will make your car real fast. lol.

 

Yea that crank pulley is going to make your 350z a rocket... you will be lucky to get 10 horsepower and 1 tenth at the track.

 

For $150 investement that is well worth it. God, know nothing noobs are sprouting up like weeds around here.

 

according to stillen....average 2.7hp gain for every pound reduced at the crank to be exact.

 

^^Yeah, I've heard that. I think I bought my light weight pulley for $100 if I remember correctly. Almost 5hp for that much and an easy job was pretty much a no brainer.

 

[QUOTE=Ztalker]go underdrive if your not going the turbo/supercharge route in the future.

whats the difference?

should i get both?

 

power wise, no it won't make any difference.

we've got underdriven, and std diameter versions, both in stock..and can even package it with belts if needed

Adam

 

i am NA with intake and plenum spacer

should i get standard or underdriven diameters?

 

as stated, it makes no difference...you're choice

the gains come mainly from the reduced weight

 

Wrong. The stock pulley indeed a damper and is comprised of two pieces with a sandwiched elastomer rubber ring. The flywheel/torque converter acts as a damper on the opposite end on the crank. And before anyone chimes with "the VQ is internally balanced", yes, it is as is ANY late model engine built after the 1990s. Internal balancing is meaningless when the engine is actually firing and the piston/rods are twisting that crank around with serious force. Numerous 1st through 3rd order vibrations occur throughout the crank at various rpms hence the reason for dampers at either end on the crank. Real race cars wouldn't be caught dead without dampers. Often times they use heavier than stock fluid dampers which offer even better crank dampening which also allows the valve train to become more efficent.

 

wow...dave b FTW!

 

Well said. Maybe the other guy should learn about floor mats as well!

 

Same old discussion over and over - it gets old after a while.

The ring in the crank pulley is not there for balancing..it is there for noise reduction from the accessory pullies. Again, not all motor are created equal- many cars use a large diameter ring in the crank pulley to serve as an overall balance of the crank - the VQ is not, however, one of those motors.

There are plenty of "real race cars" that run non dampened pullies, and many that run non factory clutch/flywheel assemblies - it is all in the overall assembly/balance of the internals, coupled with the level of balance of the pieces mated to either end of the crank. The more finite the level of balance both with internal and external pieces, the smoother the overall operating efficiency of the motor. There are also many aftermarket pullies (some heavier than stock, some lighter) which dwarf the level of balance the factory pulley runs...and that is why they exist in the first place.

 

If you guys are talking about the harmonic balancer, the z does not have one nor, most of the other modern sports/race cars.