lightweight pulleys
 

I was wondering if anyone here has lightweight pulleys and/or a grounding kit installed in their Z? If so, did it void out the warranty and how much of a difference did it make?


2011 base, 6MT, G3 Stillen intake, Stillen exhuast

From my research on this board, Pulley will net you around 5hp. It will void warranty if the pulley was found to be the cause of damage.

ive hear mixed reviews. some swear that this will offset the engine harmonics, while other say its not a big deal.

this is the only reason i am holding off on one.

cool, thanks guys. I think im gonna hold off. how about the grounding kits, anything you've herad about those?

No performance effect no. It might help if you have a 5000W stereo system in the trunk but that's about it.

Supposedly for the new series of more modern electronically controlled engines and transmissions (AT's) a grounding kit will help balance out uneven votages to make the engine run more smoothly, especially at idle. Whether or not this has been actually Prooven... well that's another story. But it certainly sounds entertaining... :rofl2:

From the reading I've done to educate myself on lightweight pulleys, specifically for a VQ, there really isn't much of a disadvantage in installing one. Our motors are internally harmonically balanced, as almost every single V6 is these days. The damper on the OEM pulley only acts to lessen noise, and not vibration or harshness, or act as a weight balance.

And it wasn't until a wise man said the following words to me that it all made sense: "when you get a supercharger, dont you change that pulley?"

That wise man knows who he is. And he's absolutely right. People are quick to bash them, but forget that same pulley design is also what will power a supercharger kit.

That man was not so wise, as you don't change the crank pulley at all for the supercharger, though you could if you wanted to.

With that said, I am in the "underdrive pulleys will not damage your engine" camp, I only sold my stillen UD because im installing an SC soon. I will likely run a lightweight crank pulley though.

Honestly in my opinion, 5 or so horsepower isn't worth even the slight chance of damaging something, or voiding the warranty. I would save the $$ from this and put it towards something else that will yield noticeable gains. Just my thoughts, good luck with whatever you decide

It's not just the power gain, its the response from the engine. By reducing the rotational mass you allow the engine to rev easier/faster, this coupled with a flywheel can make quite a difference.

Yeah, don't OEM flywheels have dampers on them that have the same function as the damper on the pulley?

In principle, it's the same type of mod.

some flywheels do, Nissan has used a "dual mass" flywheel since the 350 came out, it reduces NVH by design, but weighs about 32lbs.

I don't know if this helps, but I got the Stillen UD pulley. It is to reduce the stress on the alternator by 20%percent I believe just check the website. It does have a little bit more quickness on the rpms though I see it more in 3rd I feel it wanting more and pushing over a "hill" as I'd like to think. This is just my own experience. I have talked to the dealership near me and they told me all that harmonic balance ******** and da da da. I talked to the dealership I bought it from he said no, it doesn't mess with your timing or anything it actually is a good modification and it will not void my warranty. When I brought my vehicle in for an oil change I talked to the guys at the dealership that said no on the install and these guys couldn't believe the boss said that. This is just my experience though make some phone calls and talk to other people. In in the end, it's your car and your money, if you can't afford to fix your car if a mod voids your warranty then I would advise you not to get in the racing business.

I've had a Stillen Lightweight Pulley (standard size) in my Z for a while and I do notice it revs a bit quicker.. Also, you can feel the difference when decelerating; engine feels "lighter"..

As of right now, I'm getting installed a UR lightweight alternator pulley as well.. I don't expect to feel any major difference from this mod though..

As many forum members will tell you, quality aftermarket pulley kits are very safe, will improve HP & TQ delivery, improve throttle response, and even increase MPG.

THE COMPREHENSIVE THREAD ON NST PULLEYS:

http://www.the370z.com/engine-drivet...no-charts.html

All the above questions/comments/concerns have been discussed in great detail and there are 25+ pages of actual reviews from actual pulley owners with actual real world cars.

No cases of engine problems when NST pulleys have been used.

Good luck and have fun with all your projects!

:tup::tup:

Cool, thanks peeps.

In it's ongoing mission to bring new affordable products to the market, we have recently released the AMS Lightweight Crank Pulley.
http://i139.photobucket.com/albums/q.../file_20_2.jpg

http://i139.photobucket.com/albums/q...file_19_10.jpg

Product Description:

-AMS Lightweight Crank Pulley for the '08+ 350Z VQ35HR engine as well as the 370Z's VQ37DE and VQ37VHR engines.

-This pulley replaces the heavier stock crank pulley (4.7 lbs) with a lighter machined aluminum piece (1.45 lbs), which is nearly a 70% weight reduction.

-Power and torque gains throughout the power-band!

-Metal sleeve on main crank pulley for a positive seal – no leaking main seal! Other alternative units lack this metal sleeve.

-Since this Crank pulley is not underdriven like others, you will not experience any issues with your charging or cooling systems during daily driving. In addition, by not being underdriven you may also use a OEM size drive belt.

-Fully balanced, super light, and super strong!

-Aircraft grade aluminum construction to ISO 9001 manufacturing standards

-AMS laser-etched logos

-Anodized black for an ultimate protective finish and sleek look!

1-888-888-AMSINC
AMS '07+ 350Z / G35 LIGHTWEIGHT CRANK PULLEY - Engine - 370Z / G37

http://www.nonstoptuning.com/images/...ST13710KRG.jpg

http://www.nonstoptuning.com/images/...NST13710KG.jpg

http://www.nonstoptuning.com/images/...NST13710KR.jpg

The above thread is now at 30+ pages.
And NST pulleys are still just as affordable as ever!


MIKE @ NST

I've had NST Pulleys now for over 5k miles, zero problems. :tup:

I have been running the NST set for awhile now and have no problems with vibrations or any other concerns addressed in this thread. Performance gains would be difficult to say, as I also replaced my exhaust, intakes and cats at the same time. The difference in mass of the stock pulley had to let the engine wind up faster though.

That's my biggest notice over the ~2hp gain. How quickly the engine revs.