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SolaraGuy.com • View topic - NonStopTuning 1MZ Pulley Feedback, User Reviews, Comments
Talk about aftermarket Toyota Solara Gen 1-1.5 upgrades.

NonStopTuning 1MZ Pulley Feedback, User Reviews, Comments

Postby JamesT » Sat Nov 21, 2009 9:23 pm

I would think that if Gabe (trd4life) likes it and sees no problems with it - since he builds motors - I wouldn't be too worried.

From my understanding, the only issue that might arise would be if your engine consistantly saw very high RPMs.
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Postby lexmex » Sat Nov 21, 2009 11:25 pm

You shouldn't have any issue.

When I used to live in Mexico, I knew a lot of guys there who thought underdrive pulleys were the rage (not to mention lightweight crankshaft pulleys) and they were among the most popular modifications given the great price to hp ratio (think about it). Never did I hear of any issue with such pulleys, and I swear a lot of the guys would take their 1/4 mile track habits on to the streets and during their commutes, and still never an issue. I think this is an excellent product that is being put out and very happy to see NST has done all of our 1MZFE communities a great favor in coming out with this fine product. ;)
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Postby chaneytsai » Sat Nov 21, 2009 11:45 pm

Thanks guys. Good to know it should be safe to use this NTS pulley. It will be on my future mod list.
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Postby NonStopTuning » Wed Nov 25, 2009 7:43 pm

This one deserves an entire book, but here goes...

Q. Will NST Pulleys lead to premature engine failure?

I cover this topic at least several times a month but I don't mind, I understand that your cars are a very large investment for all of you and I prefer that you be intelligent and informed about all your modifications. So here we go again... Please take a few minutes to read everything I have posted here, as I worked hard on trying to give you a good explanation on the topic...

In the past many engines were externally balanced. There was an external balancer attached to the outside of the engine, on the crank snout, used to balance the engine externally. The crank pulley in such engines would then be attached to this balancer. Removal of this balancer is a bad idea. These balancers were most often used on large (6 to 8) V shaped engines of the domestic muscle car era.

Take a look at any modern (1980s and beyond) Honda, Toyota, Nissan, or other Japanese engine and you will find no such balancer. These engines are all internally balanced, and this process has improved even further since the late 1990s. So the topic of a BALANCER does not apply here.

What you will find on many modern engines is a harmonic damper. This is a small rubber band, litterally less than 2mm, less than 1/8th of an inch, thick that is built into the crank pulley. OEM crank pulleys are often called DAMPERS. Try placing an order for a crank pulley at your dealer and your invoice will read damper. This rubber is used to absorb something called NVH, noise/vibration/harshness. Suffice it to say, this rubber is actually not very good at performing its intended purpose after as little as a few thousand miles. What happens to rubber after a couple years of humidity, weather, snow, rain, etc? It often becomes brittle, hard, and crunchy. Can something with these properties actually absorb vibrations very well?

Many many NST customers, including people on your own forums, have reported smoother running engines with NST pulleys. Especially at idle. How is this possible if the rubber is such a vital and super important piece??? Perhaps the rubber is not as important as it is cracked up to be???


Furthermore....


On the topic of the rubber damper, engine vibrations, or possible threats resulting from elimination of this rubber piece...

On a relatively understressed near stock motor with bolt ons or low amounts of boost like what most of the people on this forum probably run, a solid pulley will not have any life threatening consequences. The factory pulley with a 2mm (less than a 1/8th inch) damper is primarily there for wide band NVH (noise vibration harshness) suppression from the engine and driveline. Removing the damper and replacing it with a solid pulley may lead to minor additional NVH but will not harm the engine. In fact, most people claim their engines seem to run smoother with NST pulleys.

The engineering reasons are that most modern engines have a short, strong crank with, a relatively high natural frequency. The dangerous second harmonic that can cause damage occurs at an rpm that this sort of engine will never see, in the area above 10,000 rpm. Even the stock damper is not tuned for attinuation at this sort of rpm so the argument is somewhat of a moot point.

Now weak engines that are pushing the limit with LOTS of revs, wimpy cranks, super long strokes, lots of boost and dwelling in the upper rpm ranges for long periods of time can benefit from a damper designed to deal with this sort of operation but our engine is not like this, and probably very few people with this motor on this forum push the envelope that hard. How many 500HP, 12,000RPM motors do we have on these forums?

As far as I can tell, our engine has a strong and stiff bottom end that is well built for our intended use. It has an internally balanced crankshaft which is less like to break due to torsional vibration.

There are a lot of Honda, Toyota, and Nissan guys who use underdrive crank pulleys in road racing series like NASA or SCCA. Road racing is much more punishing on an engine than other motorsports. The engine is subjected to run times lasting roughly 30 minutes with the engine always in the upper ranges of its rpm limit. One race weekend is the equivilant of hundreds of 1/4 mile passes. These guys would not use NST pulleys if they were not reliable.

NST sponsors the first ever wheel to wheel Scion tC NASA Road Race car. The same car is also very competitive in the Grand Am series and has factory backing from Toyota, Scion, and TRD. This car has been using pulleys from NST with great results since day one.

NST has sponsored several drift cars participating in the professional US drift series, Fromula Drift and the D1GP USA Pro Drift Series. Several of our cars have also competed in the NOPI Drift series. To make things better, NST products are also used in autocross, time attack, and drag cars. These cars have been using NST pulleys with no issues of any kind for the past few seasons.

We could go on and on...

Is a solid crank pulley harmless to all engines? No it is not. As I said... small, super high reving engines, when modified way past the simple bolt on stages may have problems. These engines reach critcal harmonics, past the 10,000 rpm range, an rpm only reached by certain RACE engines.

A mildly modded inline six will most likely be fine but one subjected to high rpm for long periods of time (90% of its life) with lots of boost will probably suffer. In this case , the stock balancer/damper is probably not adequate either.

Some of the older American V8 engines are externally balanced and it is critical not to use a solid hub pulley not designed for these applications, or damage to the engine could result. You will not find solid NST pulleys on our website for such engines.

Our engines and most around here do not fall into the above categories. Rest assured that your engines will not blow up and die or have a reduced life in street and even racing use with these parts.

I would bet that every "expert" that tells you otherwise has little personal, practical, real world experience with the subject; as it applies in your case.

Again, I understand that your cars are a very large investment and that you depend on them as your daily means of transportation, so I do not take your questions personally. But please remember... No NST product is designed to cause you any harm or grief.


Thanks again everyone, good luck and have fun with all your projects!


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Postby Midias » Wed Nov 25, 2009 7:50 pm

Just a quick side note on built engines. Paladin had great success when he had his crank knife edged and balanced with the underdog racing pulley on his super solara.


Once again over 45k miles on my lightweight pulley and no problems yet. Infact my engine had almost 175k and does not bur a drop of oil, shudder or do any other weird high mileage things even has the original clutch.
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Postby angmedic911 » Thu Nov 26, 2009 2:49 pm

Thanks Mike from NST for this information. I hope this will help others that are on the fence about getting your pulleys. Thanks again.
Last edited by angmedic911 on Mon Jan 04, 2010 1:39 pm, edited 1 time in total.
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Postby lexmex » Thu Nov 26, 2009 9:54 pm

Midias wrote:Just a quick side note on built engines. Paladin had great success when he had his crank knife edged and balanced with the underdog racing pulley on his super solara.


Once again over 45k miles on my lightweight pulley and no problems yet. Infact my engine had almost 175k and does not bur a drop of oil, shudder or do any other weird high mileage things even has the original clutch.


I have about the same amount of mileage on mine and it's performed just fine whether at high altitude as back in Mexico City or now at sea level here in South Florida and I know there were a whole bunch of RX300 owners got in on a URD pulley deal (of course no longer made) back in Dec. 2005 and I've never heard any issue of any kind with such a pulley. My cousin Carlos back in Mexico has a 1995 Golf VR6 that I got Unorthodox pulleys for him and again not a single issue with them.
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Postby NonStopTuning » Mon Nov 30, 2009 11:12 pm

Thank you for posting your feedback guys.

Anyone else who has any installation pics, feedback, or reviews on the NST pulleys should also post up.

This thread already has some good info, and will hopefully get even better with some time.


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Postby bbq bob » Fri Dec 04, 2009 7:19 pm

got my pully on tuesday ( thanks greg ) and it works pretty good . i'm banging on the rev limiter . it revs up faster then it did before . almost have to learn to shift the auto again . should work great with the 5 speed swap coming this month .
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Postby NonStopTuning » Wed Dec 09, 2009 8:11 pm

bbq bob wrote:got my pully on tuesday ( thanks greg ) and it works pretty good . i'm banging on the rev limiter . it revs up faster then it did before . almost have to learn to shift the auto again . should work great with the 5 speed swap coming this month .


Glad to hear it bob! Enjoy your new pulley!!!


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Postby NonStopTuning » Sun Jan 03, 2010 7:58 pm

Anyone else interested in an awesome pulley?!


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Postby trd4life » Sun Jan 03, 2010 8:23 pm

non stop any chance you could make a alternator and power steering combo set that would work for the supercharged guys to compliment the OEM diameter crank pulley?
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Postby NonStopTuning » Mon Feb 15, 2010 12:29 pm

trd4life wrote:non stop any chance you could make a alternator and power steering combo set that would work for the supercharged guys to compliment the OEM diameter crank pulley?


If it's a pulley, we have the ability and expertise to make it lighter.

The question is, does the community want to support such a product?


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Postby cartang » Mon Feb 15, 2010 2:02 pm

Pulley installed , amazing when it rev up . Thanks :D
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Postby SirThomas8 » Wed Feb 17, 2010 10:51 pm

Forgive my noobness, but let me post a hypothetical question I've been pondering.

From what I've read, the underdrive pulley is more-so meant for the N/A crowd, and the light weight pulley is meant more so for the S/C crowd. The reason behind this being that the underdrive pulley would slow down the super charger and reduce boost.

So, if that is the case, here's my question: Say you have an S/C, can't you get the underdrive pulley, and then put on a higher-PSI pulley on the S/C to compensate? It seems to me that with that, you'd get the best of both worlds. Accessories would be slowed, rotational weight would be lightened, and you'd be able to keep your S/C boost around the same levels.
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