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01-03-2014, 01:35 AM | #1 |
Drives: peArL yAvItZ!! Join Date: Jul 2009
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Explain: NST Underdrive & MI pulley
Hi all,
Currently I am on NST 10% under-drive pulley. I knew that NST have a problem with customer service etc. So far no mechanical problem on me yet. I just need to know the exact different on the output of the 2 given pulley. 1. NST 10% smaller than OEM pulley size and light. Since this is 10% smaller in size, It will reduce the engine load by 10%? 2. MI OEM size pulley. I read that this is a tad lighter than the NST 10% UD pulley. Since this is OEM size, the loading to the engine is the same BUT just a MUCH lighter pulley? Am i correct? Overall, what does each pulley can make the driver butt feel? Kindly enlighten...
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1NZ-FE Yaris with JDM RS front & rear bumper | JDM Vitz RS taillamp | JDM Vitz window visors | JDM Vitz Netz logos | JDM leather steering wheel & shift knob | 4k HID | K&N panel filter | Fujitsubo Wagolis exhaust | NST 10% crank pully | KYB Excel-G shocks | NF210 Springs | Cusco 4 points lower arm bar & Type OS top struct bar | RZCrew sub-frame collars | Ultra Racing 19mm rear sway bar & rear lower & center braces | PG Rear 13mm hub spacers | Exzess 2-pot calipers with 282mm rotors | Runstop Rear Disc | SSR Semi-Forge Type F 15" rims | Michelin Pilot Sport 3 195/55/15 tyres |
01-03-2014, 07:32 AM | #2 |
The 10% smaller pulley will run all your accessories 10% slower thus reducing parasitic drag on the motor. That being said, your water pump, alternator, and a/c compressor are all running slower than factory. There are gains to be had there but not 10%. I know guys that did this in larger trucks and saw a hp or two of increase but they were dynoing 300+ hp.
The fact that it is lightweight means that it is going to rev up faster meaning it will be more responsive. It is the same concept as doing a lightweight flywheel though the difference is not as significance (since you still have that heavy flywheel in there). I have always heard that the weight difference is a bigger factor than the size. Some cars are very funny about running the accessories too slow (not sure about the yaris though). I have the MI pulley myself and am happy with it. If I were you, I would leave what I had on there (unless you notice cracks in it... no seriously, check it). I do know that garm put a lot of effort into designing out some of the original flaws of the NST pulleys as they did have issues cracking and breaking. That being said, I have never owned the NST underdrive pulley so I don't have first hand experience. hopefully this helps. I know there are guys on here that know way more about this than I do but I figured I would throw out a response. |
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01-03-2014, 09:38 AM | #3 |
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Our pulley maintains OEM size while reducing weight. I like that combination, and I wanted to produce it that way; your accessories all spin according to the way Toyota designed them. Reduced rotational inertia is how you get increased throttle response. "Horsepower" is not the primary benefit of a lighter pulley (or flywheel, same thing but even bigger!)
As Beef says, I have not heard of any cracking or breakage with our design, so I think the changes we made worked.
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01-03-2014, 10:09 AM | #4 |
Mr. 155 and climbing
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are you running or planning on running forced induction?
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01-03-2014, 08:52 PM | #5 |
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No sir... Currently i am still on NA set-up... Will stick to NA all the way...
I am asking as i need to know if i change from the NST to MI pulley. Will i be downgrading or upgrading due to the fact that NST is smaller therefore less loading to engine & the MI is a tad lighter than the NST pulley... ;)
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1NZ-FE Yaris with JDM RS front & rear bumper | JDM Vitz RS taillamp | JDM Vitz window visors | JDM Vitz Netz logos | JDM leather steering wheel & shift knob | 4k HID | K&N panel filter | Fujitsubo Wagolis exhaust | NST 10% crank pully | KYB Excel-G shocks | NF210 Springs | Cusco 4 points lower arm bar & Type OS top struct bar | RZCrew sub-frame collars | Ultra Racing 19mm rear sway bar & rear lower & center braces | PG Rear 13mm hub spacers | Exzess 2-pot calipers with 282mm rotors | Runstop Rear Disc | SSR Semi-Forge Type F 15" rims | Michelin Pilot Sport 3 195/55/15 tyres |
01-04-2014, 11:41 AM | #6 |
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^ There won't be any noticeable difference; they are both lightweight pulleys. The only difference is in design, and maybe peace of mind. That's an upgrade to my mind.
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Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific. |
01-04-2014, 12:05 PM | #7 |
Mr. 155 and climbing
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Another thing to consider that this point is customer service reachability. I have the under drive pulley from NST. It has worked like a champ for me however in all honesty Mike (NST) is so busy with his business and racing it seems that he has become quite flakey in my opinion. I have called and left him 3 voice mails over the last 2 weeks with no response. Personally if I were you I would pick up the MI item and sell your NST just from a customer support perspective. MI'S shop 9 times out of 10 is pretty responsive on things. If they don't get back to you right away there is usually a solid reason. Not saying Mike doesn't have solid reasons, but his responsiveness has been quite wanting.
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Team Tiamat Racing on Facebook Youtube Channel: Team Tiamat Racing Class record holder in Land Speed @ 154.5mph for 1.5 mile and 145.5mph in the mile in the F (2.016 to 3.014 L), G (1.524 to 2.015 L), and H (1.016 to 1.523 L) classes. |
01-04-2014, 02:33 PM | #8 |
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Anything we can help you with, Adrian?
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Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific. |
01-06-2014, 05:52 PM | #9 |
Mr. 155 and climbing
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I will hit you up Garm when I have the chance. Thanks.
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Team Tiamat Racing on Facebook Youtube Channel: Team Tiamat Racing Class record holder in Land Speed @ 154.5mph for 1.5 mile and 145.5mph in the mile in the F (2.016 to 3.014 L), G (1.524 to 2.015 L), and H (1.016 to 1.523 L) classes. |
01-07-2014, 02:47 PM | #10 |
01-07-2014, 10:59 PM | #11 |
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^^ ditto.
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01-07-2014, 11:37 PM | #12 |
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If my NST pulley ever craps out I'll get the MI version.
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01-08-2014, 12:07 AM | #13 |
Hey, what gives... I didn't get a card from MI either!
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01-08-2014, 12:17 AM | #14 |
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LOL. Just for fun, we'll do Christmas cards in June this year. Why not, seems like they start playing the music that early now.
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Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific. |
01-08-2014, 02:18 AM | #15 |
Drives: peArL yAvItZ!! Join Date: Jul 2009
Location: *tIny dOts iN AsiA*
Posts: 156
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Christmas card? Nope i never receive anything from MI... ;)
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1NZ-FE Yaris with JDM RS front & rear bumper | JDM Vitz RS taillamp | JDM Vitz window visors | JDM Vitz Netz logos | JDM leather steering wheel & shift knob | 4k HID | K&N panel filter | Fujitsubo Wagolis exhaust | NST 10% crank pully | KYB Excel-G shocks | NF210 Springs | Cusco 4 points lower arm bar & Type OS top struct bar | RZCrew sub-frame collars | Ultra Racing 19mm rear sway bar & rear lower & center braces | PG Rear 13mm hub spacers | Exzess 2-pot calipers with 282mm rotors | Runstop Rear Disc | SSR Semi-Forge Type F 15" rims | Michelin Pilot Sport 3 195/55/15 tyres |
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