Crankshaft pulley

[PuntangRacing]

Will JDM performance pulley fit the USDM yaris?
This one has a rubber dampener. I'm considering
importing a small supply these pullies.
http://members.cox.net/importsusa/1NZFE.jpg

[dngz]

sorry, no clue

[RossP]

Can't see why not

[Galavoxx]

Just curious, what is the weight difference? Also, I've never installed a lightened pulley. Does this just allow the motor to rev up faster, like a lightened flywheel?

[eco]

Galavox,you think you could put up a vid clip of your magnaflow exhaust,I want to see what it sounds like.

[keesue]

The engine doesn't have to 'drag' the heavier pulley. Overcomming rotational inertia is a good thing. :-)

[Galavoxx]

The engine doesn't have to 'drag' the heavier pulley. Overcomming rotational inertia is a good thing. :-)

So it revs up faster. :thumbsup:

[Galavoxx]

Galavox,you think you could put up a vid clip of your magnaflow exhaust,I want to see what it sounds like.

I don't have any good sound recording equipment. I only have a sony DSC-T3 5.1 digicam. It does video and sound but not very good. Plus, I need someone to rev the engine and I'm home all alone. Taht last sentence sounded a little soft core. Anyway, I could take one idling and one inside the car driving?

[acrbill]

Usually the pulley is of the underdrive variety. So not only is it lighter, it frees up power by turning the accessories slow.

[mikeukrainetz]

that was my question, id be in if it was underdrive and lighter.

[Chris07LB]

I know a few Scion guys are running them... but with mixed results and reviews.

[Katana]

I thinks it has to be combined with other stuff so as to give hp.

[Chris07LB]

Mark me down for one... did LOTs of reading up on them and installs last night... :evil:

[Galavoxx]

Mark me down for one... did LOTs of reading up on them and installs last night... :evil:

So what did you find? What can we expect on the little engine that could? :iono:

[eco]

Im about to get the C-One pully,Ill let you guys know how it feels.Chris I will change my sig. soon.

[Chris07LB]

You didnt add that to your signature wish list though?? LMAO! :bellyroll:

Did you already order your's? Pm me what you paid and where.. maybe ill hold off an go C-One as well then.:thumbsup:

[dngz]

Im about to get the C-One pully,Ill let you guys know how it feels.Chris I will change my sig. soon.

where are you getting it from?? how soon before u get it?? how much did u pay?? and where exactly do you install it??

thanks, thanks, thanks, thanks!!

[Chris07LB]

and where exactly do you install it??


See the first pic.. it replaces the stock crankshaft pulley. If you are not sure which one that is, pop your hood, follow the belts to the lowest biggest pulley (center of engine) and ding ding ding.. there it is!:tongue:

[eco]

http://www.kamispeed.com/product_info.php?cPath=1131_2061_2227_2232&products_id=1565&SesId=1330cf75dec1ece22081dd38950ffcf7
I also ordered the C-One thermostat cap,the pully was $270,and cap was $82.00,shipping was $12.00,ya I know they were expensive,but I couldnt wait,flywheel is next.
lol Chris,ya i decided to go with the garage sooner then later,today hopfully.

[eco]

Not only that,but I cant put any more info in,it has a cap on the # of letters I can add,so its maxed out already,that is the real reason I havnt added it.

[punch]

You peeps with big stereo's are asking for trouble, the stock alternator is week, and your going to underdrive it?

also we have electric steering no belt! so i doubt we would gain much, but keep us informed, you swayed me on the headers, maybe the pully is next?

[eco]

Well,this is the other reason why I havnt added any ICE(In Car Entertainment) to the car yet,I figured I'd get all the performance upgrades installed first,then see if I needed an alternator swap.But Ill keep you informed,I think that it will work out perfectly,C-One test all there products religously,and I trust them.

[KSIbucky]

Can't see why not

ya why wouldnt it

[Chris07LB]

stock alternator is week, and your going to underdrive it?


Re-read the title.. we are talking about the crankshaft pulley here, not underdriving all the pulleys.

[PuntangRacing]

Hello,
This pulley does not underdrive, its the same diameter as OEM.
Just much lighter. I currently sell these for the Honda fit.
But will have one for the Yaris very soon for test fitting USDM yaris & scion.

[Chris07LB]

Hello,
This pulley does not underdrive, its the same diameter as OEM.
Just much lighter. I currently sell these for the Honda fit.
But will have one for the Yaris very soon for test fitting USDM yaris & scion.

There shouldnt be any difference in fittment between xa/xb and the Yaris 1.5L correct? Same cranks being used..

[acrbill]

If its not an underdrive pulley I really can't imagine that there would be any sort of gain. Also having a non damped pulley is far from ideal.

[Galavoxx]

If its not an underdrive pulley I really can't imagine that there would be any sort of gain. Also having a non damped pulley is far from ideal.

Not sure of the formula but this also holds true for lightened flywheels and clutches: rotating mass weighs a hell-of-a-lot more than stationary mass. Somebody else around here might have some actual numbers but decreasing the pulley weight by one pound will allow the motor to spin up faster due to the fact that is has to move a lot less weight. This is especially true at the lower rpms where there is less torque/horsepower available. I don't know how noticeable the performance gain would be with just a lightened pulley since I've never installed one, but I have done an old Porsche flywheel and clutch and the accelleration gains were awesome. With some trade-offs, of course. :biggrin:

[acrbill]

A lot of times when your dealing with a lightened flywheel your losing at least 10lbs. I put a UDP on my old Neon and there was minimal gains, and I would attribute any gain to the underdrive aspect.

The Neon also had 2 grooves so it stood to lose a lot more weight than a single groove setup.

I just think $250 for a pulley is insane.

[Galavoxx]

I just think $250 for a pulley is insane.

Agreed. Plus, I was doing an oil change today and it looks like you would need to have baby hands to change that thing out without dropping the motor.

[Chris07LB]

Install is easy. :wink:

[RossP]

Agreed. Plus, I was doing an oil change today and it looks like you would need to have baby hands to change that thing out without dropping the motor.

You could fit a pulley in the old yaris through the wheel arch, probs best to do it that way again if theres room

[Chris07LB]

You could fit a pulley in the old yaris through the wheel arch, probs best to do it that way again if theres room

Same way its done on the xa/xb Scions... Again, if only changing the crank pulley, its cake.

[Galavoxx]

good to know. Maybe I'll take my stocker off and just get it lightened.

[Chris07LB]

Doesnt quite work that way... by the time a machine shop sets up to lighten yours, you could just buy a brand new one.

Besides, its not like there is much to remove on a stock pulley, without effecting its strength.

Aftermarket pulleys are not lightned stock pulleys FYI.

[Galavoxx]

Doesnt quite work that way... by the time a machine shop sets up to lighten yours, you could just buy a brand new one.

Besides, its not like there is much to remove on a stock pulley, without effecting its strength.

Aftermarket pulleys are not lightned stock pulleys FYI.

I'm not that stupid. :biggrin: A lightened pulley wouldn't be as light as an aftermarket aluminum piece but depending on who you know, it would get done fast and definitely be just as strong. Actually, the Yaris pulley is so damn small... doesn't look like it can be lightened. Anyway, have you seen some of the Aluminum stuff that is being sold. It looks treacherously fragile. There is such a thing as too light, although this particular pulley doesn't have a huge amount of stress placed upon it. The C-one pulley looks strong enough. This one for half the price might be a better option:

http://www.vividracing.com/catalog/product_info.php/products_id/6581

[Galavoxx]

Supposed 9 hp gain on this pulley. I wonder how realistic that number is?

http://www.injectedperformance.com/ViewProduct.aspx?ID=4277

I like the red. Should fit the Yaris. no?

[acrbill]

Supposed 9 hp gain on this pulley. I wonder how realistic that number is?

http://www.injectedperformance.com/ViewProduct.aspx?ID=4277

I like the red. Should fit the Yaris. no?


OMFG. How the hell could they even advertise a 9hp gain. Thats an 11.5% gain in whp (assuming 78whp). The superchargers offer a 30% gain.

How much does the stock pulley weigh?

[Galavoxx]

Looks like the stocker is about 4.5lbs, maybe 5lbs since the pulley claims a 4lb weight reduction. Check the dyno run at the bottom. I know it's a TC but if even half of this is true...

http://www.vividracing.com/catalog/product_info.php/cPath/4206_4243/products_id/10126

[acrbill]

Looks like the stocker is about 4.5lbs, maybe 5lbs since the pulley claims a 4lb weight reduction. Check the dyno run at the bottom. I know it's a TC but if even half of this is true...

http://www.vividracing.com/catalog/product_info.php/cPath/4206_4243/products_id/10126

I don't believe that dyno chart for a second.

Also check out this link about undamped pulleys. http://www.suprasonic.org/public_html/sonictech/tet/dualratedamper.html

I don't want to come off as a know it all prick but come on, 9whp out of a 78whp car?

I could believe it if we had a sewer cover bolted to the crank.

[Chris07LB]

I'm not that stupid. :biggrin: A lightened pulley wouldn't be as light as an aftermarket aluminum piece but depending on who you know, it would get done fast and definitely be just as strong. Actually, the Yaris pulley is so damn small... doesn't look like it can be lightened.

I didnt call you stupid. :confused:

But it looks as if you saw the light, no pun intended, on lightening the stock pulley.

Anyone want to buy a Scion one for 100 bucks? :cool:

[Galavoxx]

I don't believe that dyno chart for a second.

Also check out this link about undamped pulleys. http://www.suprasonic.org/public_html/sonictech/tet/dualratedamper.html

I don't want to come off as a know it all prick but come on, 9whp out of a 78whp car?

I could believe it if we had a sewer cover bolted to the crank.

That dude has 700hp!! I can believe that sonic noice/vibration may decrease engine life but I don't believe that article applies to every car across the board. Sounds like he's talking about Supras. 400hz is a very specific number and since most everything in the universe (automotive and otherwise) resonates at a different frequency, it seems like it wont apply exactly the same way to our motor as it does to his. And yes, I read the article. Anyway... ever see that old movie of the bridge shaking apart? That does sort of make me think twice about getting a pulley. Could you imagine, you just sustain the rpms at exactly 4720 for a little too long and then... the motor shakes apart, flywheel and all!! ahhaha!! :biggrin:

As an aside, they sell these things... for those too feeble to go full aluminum: http://www.mythelogy.com/

And...

Read this:

People are getting their crank pulleys confused with the harmonic dampers found on some V6 / V8 engines. "Harmonic Balancer" is a term that is used loosely in the automotive industry. Technically, this type of device does not exist. The "balancer" part comes from engines that are externally balanced and have a counterweight cast into the damper, hence the merging of the two terms. None of the applications that we offer utilize a counterweight as part of the pulley as these engines are internally balanced.

The pulleys on most of the new import and smaller domestic engines have an elastomer (rubber ring) incorporated into the pulley that looks similar to a harmonic damper. The elastomer in the OEM pulley serves as an isolator, which is there to suppress natural vibration and noise from the engine itself, the A/C compressor, P/S pump, and alternator. This is what the manufacturers call NVH (Noise Vibration & Harshness) when referring to noticeable noise and vibration in the passenger compartment. It is important to note that in these applications, this elastomer is somewhat inadequate in size, as well as life span, to act as an effective torsional damper. If you look at the pulleys on some of the imports there is no rubber to be found at all. We have samples of these, mostly from Acura/Honda, the Nissan Altima, 1.8L Eclipse, 2.3L Fords, Chrysler 2.2L's, and 1.8L VW's, to mention a few. This is not to say that with our pulleys you will hear a ton of noise or feel more vibration from your engine compartment. Most who have installed and driven a vehicle with our pulleys will notice the engine actually feels smoother. This is a natural result of replacing the heavy steel crank pulley with a CNC-machined aluminum pulley. NVH is variable and unique to every car. NVH will increase with the installation of an aftermarket intake and/or exhaust, for example. Think of OEM intake systems in newer cars, they use baffles and resonators in the intake to quiet all the intake noise. Aftermarket intakes eliminate these resonators and create dramatic increases in engine noise from the throttle opening and closing. So to most tuners, certain types of NVH can make the driving experience more enjoyable.

The purpose of a traditional harmonic damper is to protect against crank failure from torsional movement. This is not necessary in most modern engines because of the many advances in engine design and materials. Factors such as stroke, displacement, inline, V configurations, power output, etc., do determine when and how these harmonics and torsional movements occur.

Again, there is a lot of internet hearsay about the pulleys. When engine problems occur, too often people are quick to blame the pulley first, rather than taking the time to look logically into why there was a problem. We hope that after reading this you will understand the crank pulleys better.

[Galavoxx]

Anyone want to buy a Scion one for 100 bucks? :cool:

Call me crazy but, hell yeah!! :evil:

[acrbill]

Besides that rubber ring that I have seen on a few stock pulleys, the actual cast iron plays some part in absorbing high frequency vibration. On the 1st gen Neon there was this huge cast iron block at the attachment point for the front motor mount. Its called a mass damper. Its there to absorb high frequency vibration that would eventually lead to metal fatigue at the attchment point for the FMM.

Don't get me wrong. I had an underdrive pulley on my Neon for over 50k miles.
It served me well. I am all for weight reduction anyway I can get it. I just don't buy the supposed HP gains.

I am far from an expert so take everything I say with a grain of salt.

[Galavoxx]

I am far from an expert so take everything I say with a grain of salt.

x2

I just want a few extra ponies. That dampened lightened flywheel looks pretty good though. Gains look more realistic: 3 to 5whp. Probably more expensive... didn't see a price.

[Galavoxx]

Extra weight on the pulley will also allow for slightly smoother, if not slower acceleration. The motor will also sustain engine speed/rpms more easily. Same effect as the flywheel but on a smaller scale. I little more engine braking would be nice. This car does not engine brake at all.

[PuntangRacing]

Does the yaris have 2 drive belts or 1?

http://members.cox.net/importsusa/yaris.JPG

[acrbill]

One belt for the a/c and alternator.

[Galavoxx]

Does the yaris have 2 drive belts or 1?

http://members.cox.net/importsusa/yaris.JPG

Ooooohhh... what's that?!!! :eyebulge: For Yaris?

[paultyler_82]

I've always used a dampened lightweight pulley, I'm way too paranoid to go undampened, looks like mythelogy is the way to go, unless Fluidampr makes something for us.