[JoosyJoos]

Originally Posted by jcarlucci1

yea, I would be much more inclined to buy if these looked just like stock..anyone know how hard the diy install would be?

Usually you have to have a special pulley tool or they provide one. Personally I'd just go get it done somewhere and avoid the hassle.

[dlbrooks18]

impressive, I like the added power up top

[ezatnova]

What's the downside? Obviously there is something, otherwise OEM would have been like these.

[twenzel]

the disadvantage is the mass of the OEM pulley is typically matched to rotational mass of the stock clutch and flywheel assembly on the other side of the crank shaft. This imbalance can make the engine noisier or idle rougher. It honestly will probably not be very noticeable if at all though. like OP said, this engine doesnt have a harmonic dampener like you typically see on inline 4 cylinders because inline 6 are more naturally balanced.

BMW would rather cast a steel or iron pulley than CNC machine an aluminum pulley for cost reasons which is why you typically dont see parts like this on a production car.

[TurboBimmer]

Hmm, sounds a bit too good to be true, no?

Let's say the drivetrain losses are 16%. Should be close to the real number. On a 400 bhp car only 345 arrive at the wheels. And from this 55 bhp loss you can gain back more than 10 by just changing a pulley?

[enrita]

Originally Posted by Autobahn335i

Hmm, sounds a bit too good to be true, no?

Let's say the drivetrain losses are 16%. Should be close to the real number. On a 400 bhp car only 345 arrive at the wheels. And from this 55 bhp loss you can gain back more than 10 by just changing a pulley?

didnt you see the dyno sheet? pretty clear that gains were achieved. wait for some private dynoes if you think they are scamming .

[TurboBimmer]

Originally Posted by enrita

didnt you see the dyno sheet? pretty clear that gains were achieved. wait for some private dynoes if you think they are scamming .

Didn't say they were scamming. But just sounds a bit too "easy" for me. I'd imagine that BMW would have implemented this right from the factory, unless the engine gets too unbalanced.

But it sure sounds like a very interesting mod.

[FoShizzle]

Just came across this thread. Great stuff!
I was wondering when we'd see these for our cars. I had something like this on my Mercedes a few years back. Besides the hp increase the engine was noticeably quicker to rev because of the reduced rotating mass. With a manual tranny, it was much smoother in up and downshifting as well.

[roozie2001]

Originally Posted by Autobahn335i

Didn't say they were scamming. But just sounds a bit too "easy" for me. I'd imagine that BMW would have implemented this right from the factory, unless the engine gets too unbalanced.

But it sure sounds like a very interesting mod.

Its not always the case. Our cars should come with more boost and a free-er flowing intake. But they dont. Thats why theres bolt on performance parts.

Originally Posted by MikeJabb

Just came across this thread. Great stuff!
I was wondering when we'd see these for our cars. I had something like this on my Mercedes a few years back. Besides the hp increase the engine was noticeably quicker to rev because of the reduced rotating mass. With a manual tranny, it was much smoother in up and downshifting as well.

Thats exactly what my favorite part about it is. The price for the quicker revs and the smoothness is worth the mod in itself. The power gain is just gravy on top for me.

[ernster]

will this void your warrnty? can they bust your chops for this like if you had downpipes?
or is this like an intake type mod were it is overlooked everywhere

[roozie2001]

Originally Posted by ernster

will this void your warrnty? can they bust your chops for this like if you had downpipes?
or is this like an intake type mod were it is overlooked everywhere

i dunno the answer to that. if i had to guess i would say it depends on the SA and which stealership you go to. Anyone else have an idea??

[FoShizzle]

Originally Posted by roozie2001

i dunno the answer to that. if i had to guess i would say it depends on the SA and which stealership you go to. Anyone else have an idea??

You got it. A cool service advisor can look the other way. That's assuming anybody even notices. I had a set of pulleys from evosport for years on my Benz and my dealer never noticed cuz they were stock color.

[jcarlucci1]

When are we getting pricing on these?

[klipseracer]

First of all, I think this is a great product.

As for the doubters, The potential to gain 10rwhp is definately there. I think there may be some variance in the dynos due to different variables but I think the bottom line has been proven. The product is producing numbers.

Secondly, there ARE downsides to buying this part. If you are worried about your warranty, and you tend to take all your parts off before service, this is probably not something you would want simply because you can't just slip it on and off. This is actually not a product that a lot of people will install themselves because it probably requires losening up motor mounts, taking off a few belts, a special pulley puller etc. You'll also probably have to toss this pulley into an oven for 30 minutes so the aluminum will expand far enough to actually slip over the crank and once you got it on a little bit its a huge pain in the ass to get tightened down without the proper tools.

However, if you have the proper tools and the experience with the crankshaft area this could be a breeze to install and shops would likely have no problems putting this on professionally whatsoever. Just don't think ur gonna take it off for every oil change service.

The good thing is since there is less rotating mass, there is less weight to 'get up to speed' therefore its like buying a lightweight flywheel in a way. It doesn't add to the power of your engine directly, it is just restricting the engine less therefore opening it up a little more.

Question for the OP: Has NST considered a UDP? Maybe a conservative underdrive? What would the numbers look like with say a 15% underdrive? Thanks.

[1clean335i]

Nice mod!

[Sparky66]

Hopefully they offer this in Anodised Black and not just Red as it stands out like dogs balls.

[FoShizzle]

Originally Posted by klipseracer

First of all, I think this is a great product.

Secondly, there ARE downsides to buying this part. If you are worried about your warranty, and you tend to take all your parts off before service, this is probably not something you would want simply because you can't just slip it on and off. This is actually not a product that a lot of people will install themselves because it probably requires losening up motor mounts, taking off a few belts, a special pulley puller etc. You'll also probably have to toss this pulley into an oven for 30 minutes so the aluminum will expand far enough to actually slip over the crank and once you got it on a little bit its a huge pain in the ass to get tightened down without the proper tools.

However, if you have the proper tools and the experience with the crankshaft area this could be a breeze to install and shops would likely have no problems putting this on professionally whatsoever. Just don't think ur gonna take it off for every oil change service.

I think you are incorrect actually. And for sure there will be no need to loosen motor mounts - this is not a mini cooper pulley. Based on the pictures, with decent DIY this could end up being a one hour job. A pulley puller is cheap and most of us will have the other tools already.

Edit: On second look at the pictures it appears that this is not a pressed-on pulley at all. It is secured by the 6 torx screws (torqued appropriately of course).

Originally Posted by Sparky66

Hopefully they offer this in Anodised Black and not just Red as it stands out like dogs balls.

I'm kinda diggin' it actually.
Everybody knows red is faster anyways.

[jcarlucci1]

You are right..I called a local shop and they quoted me 1 hour to install

Originally Posted by MikeJabb

I think you are incorrect actually. And for sure there will be no need to loosen motor mounts - this is not a mini cooper pulley. Based on the pictures, with decent DIY this could end up being a one hour job. A pulley puller is cheap and most of us will have the other tools already.

Edit: On second look at the pictures it appears that this is not a pressed-on pulley at all. It is secured by the 6 torx screws (torqued appropriately of course).



I'm kinda diggin' it actually.
Everybody knows red is faster anyways.

[GeorgeSmooth]

Two words - group buy.

[roozie2001]

Originally Posted by klipseracer

Question for the OP: Has NST considered a UDP? Maybe a conservative underdrive? What would the numbers look like with say a 15% underdrive? Thanks.

We tried to go even more conservative than that and do a 10% UDP but it didnt fit. In order to make it happen we would need to shave it down alot and that would weaken the pulley and the last thing you need is a weak pulley on a 500hp $50k car.

Originally Posted by Sparky66

Hopefully they offer this in Anodised Black and not just Red as it stands out like dogs balls.

They're gonna be sold in 2 colors. Anodized red and black.

Originally Posted by MikeJabb

I think you are incorrect actually. And for sure there will be no need to loosen motor mounts - this is not a mini cooper pulley. Based on the pictures, with decent DIY this could end up being a one hour job. A pulley puller is cheap and most of us will have the other tools already.

Edit: On second look at the pictures it appears that this is not a pressed-on pulley at all. It is secured by the 6 torx screws (torqued appropriately of course).



I'm kinda diggin' it actually.
Everybody knows red is faster anyways.

I wish i would have took more time to watch the mechanic but it was hotter than balls in that garage especially with the humidity and the A/C and my Sweet tea waiting for me in the waiting area were alot more appealing but i can tell u once they pulled the car in the bay to remove the stock pulley it all took about an hour for them. So im guessin for a DIYer maybe 2-3?


Any other questions other than price keepem comin im happy to TRY to answer them the best i can.

[klipseracer]

My crank pulley experience is limited to only a few applications so its very possible with the n54 that there is enough room for the procedure. Hopefully

[Sparky66]

Is it possible that a lighter pulley may induce engine vibrations and distorted harmonics throughout engine components and cause long term severe engine damage ??
Steve Dinan thinks so:http://www.atiracing.com/products/da...mper_dinan.htm