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

LafitteZ

thanks mike and thanks for your great product!!

SS_Firehawk

I did a writeup on the other parts I installed at the same time as the pulley. I'm just trying to assist in posting relevant information in the hopes that the forum members can discern the gains from one part to the other. So with that said, I'll post a quick writeup of my experience so far with the NST pulley kit. I did not install this myself, but was with the mechanic throughout most of the process.

Package: Package was very light and inside a USPS box. Alt. pulley was wrapped in newspaper and inside the crank pulley, which was also wrapped in news paper. I ordered them in grey and they came as such. There were a couple dings but nothing to get butt hurt about.
Installation: The install was about what is expected with pulleys. The radiator fans were removed for space, as well as the radiator overflow reservoir. The stock crank pulley came off fairly typical. (Only 4k miles). The alternator was removed and placed in a vice to remove and replace the pulley. Installing the NST crank pulley was a bit tougher. We had to grind it down some more because it was so damn tight. The shop took their time to do it right to prevent it from seizing and bonding to the crank (making a PITA to remove in the future).
Appearance: They are grey and tucked deep inside the engine bay... It looks great and matches my CAI :P But aesthetically, it's difficult to discern from an OEM piece from looking at it after the car is put back together.
Performance: I can definitely notice a difference in comparison to the stock pulleys. It revs easier, synchro make 2nd to 1st down shifts smoother than before with less surge, and it definitely made power throughout the rpm range. The dynos below are including the gains from my AEM CAI. CAI's are known to provide more power up top and not much below 6500 rpm where the stock intake starts to run out of breath. I have a dyno chart showing my baseline, then full exhaust, and then everything in my sig (not including M370). With the pulleys and intake, I gained an average of 10whp all the way up to 6500 rpm, and from there the gains are more substantial. This is most likely from the CAI showing it's performance advantage over the stock intakes. There are no squeaks or noises coming from the pulleys, and the engine feels very smooth throughout the rpm range. It feels like what Nissan should have done in the first place. My voltages are consistent and the same as well.
Conclusion: I bought these from NST on a group buy a while back for $190 and I spent $24 buying the appropriate belt off of Amazon (was cheaper). It is hard to get a better value (minus install costs) for the money than these pulleys. I doesn't just make power in the mid range or up top, it's everywhere. I don't need to sacrifice drive ability, start ups, voltages, harmonics, nothing. This is a nicely engineered kit that removes every negative connotation we've all heard about crank pulleys.


Dyno 1, red line is with LTH, Y pipe +cat, and exhaust. Blue line is everything in my sig (no M370).

Dyno 2, Blue is baseline, red is LTH, y pipe + cat and exhaust, green is everything in my sig (no M370).

Attached Images

	dyno1.jpg (577.3 KB, 308 views)
	dyno2.jpg (394.8 KB, 72 views)

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370ZilverZ

Very nice write up. +1 I couldn't agree more. The pulley sets seem to get bashed, but it is one of the best bangs for the buck out there.

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370ZilverZ Journal

BMW Z4

NonStopTuning

Thank you SS_Firehawk for the awesome review!!! Much appreciated.

And thank you LafitteZ and 370ZilverZ for the compliments. You guys rock!


MIKE @ NST

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www.NonStopTuning.com
Offering the best in Pulleys, Clutches & Flywheels, Coilovers, and more.
Be sure to keep up with us on the NST blog!

fxroar

Any deal on these? How much is the whole package including the appropriate belt shipped to 92126? Thanks!

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KB2

^ agree,wondering the same thing. feel free to pm with info

Jordo!

Just curious, but what did they come out SAE? DIN gave you a pretty big CF, presumably to compensate for elevation.

Unless this is a dampened pulley, I'm not sure what you mean here.

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Enjoy it. Destroy it.

SS_Firehawk

SAE dyno posted below. Blue is baseline, green is LTH and CBE, red is aforementioned with pulley's and CAI.

I currently have a bad pre-cat O2 sensor on the passenger side that may have been damaged from the Header install. So gains may be higher after it's fixed. I currently have one on order.

With your second question, I was referring to the phantom theories of harmonic vibrations when running pulley's with this particular engine. I felt no noticeable changes to NVH when the pulley's were installed. The only sound it made was some creaking for about 30 minutes after install. My voltages are 100% the same as stock, the belt (NST sells a slightly smaller belt) is tight, and have no issues with the few thousand miles I have on it. Then again, it's still relatively early.

A harmonic balancer looks way different than the stock pulley. The rubber gasket on the stock pulley may have been a cautionary addition. I'm no engineer, but if it was so important, why isn't it sold with aftermarket pulley systems? Especially if it had the chance to "destroy" a motor if it didn't have this magical rubber ring

Attached Images

SAE Dyno X3.jpg (375.2 KB, 45 views)

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NonStopTuning

Thank you for the review and for posting those SS, much appreciated!

Your review and your dynos resonate with what hundreds of other NST pulley owners have been saying over the past few years. High quality, great performance, excellent value.

The topic of harmonics, vibrations, etc. have been covered in great detail earlier in this thread. Anyone interested can scroll back through this thread for detailed info. But, in short, NST pulleys will not lead to any harm on this engine.


We list these pulleys on our website, along with info and pricing, shipping is automatically calculated by our online shopping cart at the time of each order, and we'll be offering FREE shipping specials for most of the summer this year: http://www.nonstoptuning.com/NSTPULLEYS/pKitNis370.html

We also offer pulleys for many of the other popular Nissans: 350Z, 240SX, GTR, etc.

The 370Z kit is a very popular one in our catalog at this time and we've had trouble keeping up with demand this year. Unfortunately, we are sold out as of this writing but we do hope to have our next batch available for shipping within the next four to six weeks. Anyone interested can place an order on our website or contact us by phone for more info.

Thanks again, best of luck with all your projects everyone!!!


MIKE @ NST

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www.NonStopTuning.com
Offering the best in Pulleys, Clutches & Flywheels, Coilovers, and more.
Be sure to keep up with us on the NST blog!

Nut_N_Much

Read through all the posts, you have answered everything thrown at you and I still see good reviews of the product. I just purchased the kit..

I hope the problem SS_Firehawk had with his pulley being to tight was just the powder coating.. Have you looked into that issue yet? I would hate to throw the balance off doing it myself in the garage. Shouldn't be an issue if it ships ready to mount..

Can't wait to put them on..

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Did new cool science stuff to the car !!!
http://www.the370z.com/mazoc/99606-z...y-14-17-a.html
http://www.the370z.com/diy-section-d...-w-videos.html

VDC_OFF

Mike lmk when you get these back in stock. I still need to get mine!

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NonStopTuning

Thank you sir! Much appreciated.

Unfortunately, we are sold out of our kit at this time. More pulleys are in the production process and are expected for shipping by late AUG. All back-orders/pre-orders will ship ASAP and tracking info will be emailed.

We do manufacture our pulleys to tighter tolerances than the OEM pulley. The NST pulley will fit more "snug." 99% of the time your NST pulley will be a direct fit and will require no sanding, but in very very few instances customers have had to sand a bit of anodizing away from the center (bore) of the crank pulley. This is nothing to be concerned about... again, it applies to less than 5% of our customer base.

Thanks again, best of luck with all your projects!


MIKE @ NST

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www.NonStopTuning.com
Offering the best in Pulleys, Clutches & Flywheels, Coilovers, and more.
Be sure to keep up with us on the NST blog!

Nut_N_Much

Thanks for the response, can't wait.. Looking forward to the gains..

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Did new cool science stuff to the car !!!
http://www.the370z.com/mazoc/99606-z...y-14-17-a.html
http://www.the370z.com/diy-section-d...-w-videos.html

Nut_N_Much

Almost Late August I can taste them!!!!

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Did new cool science stuff to the car !!!
http://www.the370z.com/mazoc/99606-z...y-14-17-a.html
http://www.the370z.com/diy-section-d...-w-videos.html

Zoren 370

Wanting to hear your gains with the NST as soon as you get it.