[e92_615]

what do people think about upgraded pulleys in the n54 motor ?

[McMuffin]

What is there to think about when they aren't even out in production yet......

[Easternedge]

Pulley were an Awesome upgrade in My e36 M3... If these 335's were S/c'ed there would be no shortage of tuners producing them!!!

[roozie2001]

ive had it for a month now. i love it.

[getInline]

For what is likely to be a negligable gain, I'd be a little cautious just based on this article:
http://www.dinancars.com/bmw/technia...armonic-damper

[JoosyJoos]

Originally Posted by roozie2001

ive had it for a month now. i love it.

Can you elaborate on your experience please?

Install, feel, noticeable difference?

[roozie2001]

Originally Posted by JoosyJoos

Can you elaborate on your experience please?

Install, feel, noticeable difference?

revs faster. butt dyno likes it. its a quicker car all through the power band. For all the dyno whores that like glory runs that are looking for show. this may not be for you, cuz the gains are like 7-8hp and about 10-12 ft lbs of torque. But for people like me who like REAL WORLD gains, and like going faster then this mod is great.

i definately felt the gains much more than i did an intake.

[BavarianBullet]

Originally Posted by getInline

For what is likely to be a negligable gain, I'd be a little cautious just based on this article:
http://www.dinancars.com/bmw/technia...armonic-damper

Or try this one: http://g35driver.com/forums/reviews/...-pulley-2.html

[thatsosm]

Good article! I do trust the guy from Dinan, shit bmw trusts them. It doesnt seem like it is worth the extra 10 hp, risking severe engine damage.

[getInline]

Originally Posted by alexosma

Good article! I do trust the guy from Dinan, shit bmw trusts them. It doesnt seem like it is worth the extra 10 hp, risking severe engine damage.

Plus you're assuming it is actually a 10hp gain, which is very unlikely. You'd need a true engine dyno to measure the gains and a whole lotta runs to rule out variances.

[Craig@SupremePower]

waiting to see some dyno numbers...

[Former_Boosted_IS]

Dangers are way too high on this mod to justify the small horsepower gain. I won't be touching one.

[2wheelsrbetter]

definitely an interesting article from steve, but sounds like he's targeting non-dampened underpulleys more than lightened pulleys. i'm guessing the nst is not dampened, in which case i won't do it. i didn't realize our oem was, thought the dampeneing was happening somewhere else but it's in the pulley:
http://bmwfans.info/parts/catalog/E9...ration_damper/

i'll now continue to wait for Motorwerks to complete their dampened version. anyone have thoughts on whether a lightened, dampened version would be safe?

[Ryan@Motorwerks]

Originally Posted by 2wheelsrbetter

definitely an interesting article from steve, but sounds like he's targeting non-dampened underpulleys more than lightened pulleys. i'm guessing the nst is not dampened, in which case i won't do it. i didn't realize our oem was, thought the dampeneing was happening somewhere else but it's in the pulley:
http://bmwfans.info/parts/catalog/E9...ration_damper/

i'll now continue to wait for Motorwerks to complete their dampened version. anyone have thoughts on whether a lightened, dampened version would be safe?

DING DING DING!!! Someone finally figured it out. So much for the "extensive" R&D by NST...

[Easternedge]

That Dinan article is very informative! But no tuner for BMW's is dumb enough to change the harmonic balancing pulley... The theory is to make the pulley larger so they use less energy and more torque due to size to work the peripheral functions, i.e alternator etc.

But then again, On my e36 M3 with 110K when I put them on... It felt tlike the car was getting more beat every time! I ended up selling it with some squeek that could have been anything including a pulley or belts. Sooo... to void the warranty for 10 HP is not worth it atall!

[BavarianBullet]

Originally Posted by getInline

Plus you're assuming it is actually a 10hp gain, which is very unlikely. You'd need a true engine dyno to measure the gains and a whole lotta runs to rule out variances.

Agreed. It's not going to be 10HP. F=MA. To increase the force by decreasing mass you have to actually accelerate the engine- quickly.

In other words, to get gains from reduce inertia, you only see it when the engine is accelerating very quickly (like revving it in neutral or maybe 1st gear). A 4th gear inertia dyno pull wouldn't even be able to show the HP gain reliably it would be so small.

The link I posted above is to a thread on a G35 forum where people were complaining of their lightened pulleys lack of dyno HP: 2HP, if that. A mechanical engineer went on to butt heads with some thick skulls and eventually showed them how to actually calculate the power freed up and it was, um, small.

But since this is a BMW, maybe it'll be different and Newtonian Physics won't apply.

[roozie2001]

Originally Posted by Ryan@Motorwerks

DING DING DING!!! Someone finally figured it out. So much for the "extensive" R&D by NST...

how bout you stop being rude and show a little respect for another vendors product. NST has pulleys for more cars than your new shop has ever serviced. No one calls you guys out for being an over priced mechanic shop. Cmon dude show a little class and worry about your product. Hope that $400 pulley works out well for you. OH by the way 1.9 lbs with a damper? man im sure thats gonna hold up well against 400 whp. A damper is heavy. NST pulleys dont even have a damper and he didnt wanna go below 2.5 lbs. why would u go below 2 with a damper. Oh lemme guess. Makes the dyno look better.

[enrita]

I also dont understand why at the beginning of the motorwerks pulleys R&D was stated that even the oem was not dampened, quote "we even cut the OEM pulley in half to make sure its not dampened" and now comes out it is or maybe is not? Seems like the dampening is not necessary.

[R&D@Motorwerks]

Originally Posted by roozie2001

how bout you stop being rude and show a little respect for another vendors product. NST has pulleys for more cars than your new shop has ever serviced. No one calls you guys out for being an over priced mechanic shop. Cmon dude show a little class and worry about your product. Hope that $400 pulley works out well for you. OH by the way 1.9 lbs with a damper? man im sure thats gonna hold up well against 400 whp. A damper is heavy. NST pulleys dont even have a damper and he didnt wanna go below 2.5 lbs. why would u go below 2 with a damper. Oh lemme guess. Makes the dyno look better.

There are so many things wrong with this post that its going to require a new thread.... Don't worry, its coming

[Ryan@Motorwerks]

Originally Posted by roozie2001

how bout you stop being rude and show a little respect for another vendors product. NST has pulleys for more cars than your new shop has ever serviced. No one calls you guys out for being an over priced mechanic shop. Cmon dude show a little class and worry about your product. Hope that $400 pulley works out well for you. OH by the way 1.9 lbs with a damper? man im sure thats gonna hold up well against 400 whp. A damper is heavy. NST pulleys dont even have a damper and he didnt wanna go below 2.5 lbs. why would u go below 2 with a damper. Oh lemme guess. Makes the dyno look better.

Typically I would agree calling out a competitor product is uncalled for and rude, however when such a product is a danger to a person's car due to it's poor design, something must be said. In terms of you guys making more pulleys than cars we have serviced, perhaps that is because of an "ahem" expedited R&D process? In the future I would recommend slowing down in the future guys.

[NonStopTuning]

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Many thanks to those of you who have shown interest in our site and products, good luck and have fun with all your projects!

[NonStopTuning]

Originally Posted by JoosyJoos

Can you elaborate on your experience please?

Install, feel, noticeable difference?

Some of the data, benefits, and comments can be found here...
http://www.nonstoptuning.com/pageNSTblogAUG.html

Good luck and have fun with all your projects!