nst underdrive pulleys lower gas mileage? - Toyota Yaris Forums

b20vteg · 08-19-2012, 01:25 AM

i already know they increase throttle response, and make decent power... but does it do those things at the cost of lowering gas mileage?

also, i noticed that nst is no longer a sponsored vendor here at yarisworld, and the pulleys are no longer in stock on microimageonline.com... have they been discontinued? does micro image carry a replacement product that performs just as well, if not better?

baseballfan416 · 08-19-2012, 02:17 AM

Increased performance = increased desire to drive hard = lower mileage. I'm sure if you drove with the same habits you would see a negligible difference.

NST doesn't make yaris stuff anymore. To my knowledge, they had poor customer service. In the meantime, micro image did their own crank pulley (sells for like $140 on the site). The microimage crank pulley is slightly lighter than the NST, and it's meatier in the center by the bolt (for increased durability).

You'll also see that nst made water pump and alternator pulleys. They do offer weight reduction as well. But because of their cost, and less documented benefit, they're often left out of the discussion.

cali yaris · 08-19-2012, 10:11 AM

Our new pulley is OEM size, but lighter than NST's underdrive pulley was. Best of both worlds.

http://shop.microimageonline.com/MI-...LWCP-Yaris.htm

packetrace · 08-19-2012, 12:03 PM

will you produce water pump and alternator pulley Garm :D ? I would be willing to throw money if you need :)

fnkngrv · 08-19-2012, 12:04 PM

I have had the NST Underdrive pulley installed since 08. If I drive with FE in mind and not for power band then I get better FE than I did with the stock pulley by 1/2mpg. I would think it would be the same with the MI pulley. As previously stated anytime that you put on a part to give you a power increase you have to be disciplined enough to not drive it harder if you wish to get the best FE possible.

b20vteg · 08-19-2012, 12:32 PM

Quote:

Originally Posted by fnkngrv

I have had the NST Underdrive pulley installed since 08. If I drive with FE in mind and not for power band then I get better FE than I did with the stock pulley by 1/2mpg. I would think it would be the same with the MI pulley. As previously stated anytime that you put on a part to give you a power increase you have to be disciplined enough to not drive it harder if you wish to get the best FE possible.

sounds good, looks like i'll be adding that on to my list of mods to do. thanks!

fnkngrv · 08-19-2012, 12:40 PM

Quote:

Originally Posted by b20vteg

sounds good, looks like i'll be adding that on to my list of mods to do. thanks!

NP...it is nice because it makes the engine rev more freely when you need it. Not gonna say that it will feel like a few pounds of boost tho

packetrace · 08-19-2012, 01:02 PM

Quote:

Originally Posted by b20vteg

sounds good, looks like i'll be adding that on to my list of mods to do. thanks!

buy the one from Garm!!:P If you want it colored...make it anodized :)

b20vteg · 08-19-2012, 01:31 PM

Quote:

Originally Posted by packetrace

buy the one from Garm!!:P If you want it colored...make it anodized :)

yea, i plan to make all of my purchases through micro image

jpmck03 · 08-20-2012, 11:56 PM

The MI pulley works for me!

Installed it at between fill-ups (A).
Hooned it for the next tank (B).
Went back to my usual "no big rush" driving style (C)!

cali yaris · 08-21-2012, 12:23 AM

Quote:

will you produce water pump and alternator pulley Garm :D ?

We are considering it, that's all I can say at this point in time.

08-19-2012, 01:25 AM	#1
b20vteg no show, no go :( Drives: 2012 yaris 3dr hb Join Date: Aug 2012 Location: maricopa, az Posts: 369	nst underdrive pulleys lower gas mileage? i already know they increase throttle response, and make decent power... but does it do those things at the cost of lowering gas mileage? also, i noticed that nst is no longer a sponsored vendor here at yarisworld, and the pulleys are no longer in stock on microimageonline.com... have they been discontinued? does micro image carry a replacement product that performs just as well, if not better?

08-19-2012, 10:11 AM	#3
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	Our new pulley is OEM size, but lighter than NST's underdrive pulley was. Best of both worlds. http://shop.microimageonline.com/MI-...LWCP-Yaris.htm __________________ 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.

08-19-2012, 12:03 PM	#4
packetrace Drives: Yaris Sedan 2009 Join Date: Sep 2010 Location: Quebec Posts: 566	will you produce water pump and alternator pulley Garm :D ? I would be willing to throw money if you need :) __________________ Interior:ALL red, black roof Exterior:RTX scorpion painted GOLD, side and rear visor, oem spoiler, MI mesh grill, Hella supertone horn, RS badge, Vios badge, CF pillar, Led mirror cover, fog light HID 3000k, Projector retrofit HID 8000K Performance :MI CrankPulley, Tein springs, UR and TRD bar, TURBO IN PROGRESS Audio : Pionner DEH-80PRS, HAT L1V2, PowerBass 1100.5X 5 channel amp

08-19-2012, 12:04 PM	#5
fnkngrv Mr. 155 and climbing View User's Garage Drives: Seriously Modded 07 Sedan Join Date: Jun 2006 Location: In The Hotbox Posts: 4,742	I have had the NST Underdrive pulley installed since 08. If I drive with FE in mind and not for power band then I get better FE than I did with the stock pulley by 1/2mpg. I would think it would be the same with the MI pulley. As previously stated anytime that you put on a part to give you a power increase you have to be disciplined enough to not drive it harder if you wish to get the best FE possible. __________________ 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.*

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08-19-2012, 02:17 AM	#2
baseballfan416 Drives: 2017 L 3-door Join Date: Mar 2011 Location: Milwaukee, Wi Posts: 161	Increased performance = increased desire to drive hard = lower mileage. I'm sure if you drove with the same habits you would see a negligible difference. NST doesn't make yaris stuff anymore. To my knowledge, they had poor customer service. In the meantime, micro image did their own crank pulley (sells for like $140 on the site). The microimage crank pulley is slightly lighter than the NST, and it's meatier in the center by the bolt (for increased durability). You'll also see that nst made water pump and alternator pulleys. They do offer weight reduction as well. But because of their cost, and less documented benefit, they're often left out of the discussion.