lightweight pulleys

Jbernal15

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

370Z JT

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.

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Econ

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.

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2014 Triumph Thruxton 900
2013 Fiat 500 Abarth
2009 Nissan 370z

Jbernal15

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

ChrisSlicks

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

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XwChriswX

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...

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AlphaSnacks

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.

esfourteen

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.

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Captainstevo

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

esfourteen

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.

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AlphaSnacks

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.

esfourteen

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

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V8Killer

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.

pty370z

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..

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2010 Solid Red 370Z * Touring-Sport-6MT * Black Interior
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NonStopTuning

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:

NST (NonStopTuning) 370Z VQ37HR Pulley Kit Review w/ Dyno Charts

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!

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