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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

View Poll Results: Which kit?
Rogue Engineering $185 two pulleys 21 36.84%
UUC $200 two pulleys 7 12.28%
Turner $250 three pulleys 19 33.33%
Other, please specify. 10 17.54%
Voters: 57. You may not vote on this poll

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Old 06-14-2011, 11:06 AM   #61
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Jake did you purchase them after all ?
Not yet. I'm thinking about getting an intake first and then get some heat resistant foil to cover my entire intake track with.
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Old 06-14-2011, 11:10 AM   #62
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my 2 cents, pullies will throw off the engines balance due to the harmonic balancer in the engine. from what i have studied atleast. My professor told me if your willing to change pullies then you will have to get the engine rebalanced.
if you have less than 10 posts you must not know what your talking about


buddy look up underdriving the crankshaft
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Old 06-14-2011, 12:58 PM   #63
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sorry for the noob question.. but, what are the real gains os those?
Pulleys don't add real horsepower, but they do allow you to better manage it. What they effectively do is minimize the amount of engine power that accessories slave from the engine, essentially allowing the power to be applied at the wheels rather than using that power to drive accessories.

To be really basic, put a manual transmission in third gear and try to go - you accelerate slowly. Do the same in first gear and you take off, despite your engine having the same power output. With the transmission in the wrong gear, there is a huge efficiency loss between the engine and the wheels, and that's all wasted power. It's all about setting the proper ratio to allow the most power to the wheels; the same applies to pulleys.

I'd like to do this on mine, but I haven't had time or done enough research to decide on who to buy from. Good thread though!
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Old 06-14-2011, 12:59 PM   #64
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if you have less than 10 posts you must not know what your talking about


buddy look up underdriving the crankshaft
^ FTW
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Old 06-14-2011, 01:03 PM   #65
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Turner without question. Go with the guys who build race cars.
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Old 06-14-2011, 01:08 PM   #66
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Just put Rogue Engineering pulleys on mine. All those other companies are back ordered...and they were cheaper because they don't have an alternater pulley, which is a pointless item (unless you are performing maintenance, in which case I'd go OEM.)

I also have the Stewart High performance water pump and a long tube intake...car is far and above what I expected!

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Old 06-14-2011, 01:20 PM   #67
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Just put Rogue Engineering pulleys on mine. All those other companies are back ordered...and they were cheaper because they don't have an alternater pulley, which is a pointless item (unless you are performing maintenance, in which case I'd go OEM.)

I also have the Stewart High performance water pump and a long tube intake...car is far and above what I expected!

Sent from my DROIDX using Bimmer App
just ordered my stewart and watter wetter from tms. should be here by friday

i wanna get a dinan long tube in with a 3.38 and a aa tune and i should be happy for a while
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Old 06-14-2011, 01:21 PM   #68
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Not yet. I'm thinking about getting an intake first and then get some heat resistant foil to cover my entire intake track with.
Good choice. One word = Dynamat...... (not srs, but I got some if you need it )
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Old 06-14-2011, 01:22 PM   #69
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Heat resistant tape!
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Old 06-14-2011, 02:10 PM   #70
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Why does it matter if the car is a m or not. There shouldn't be a difference. If it doesn't work for non-m why would it work for a m?
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Old 06-14-2011, 02:21 PM   #71
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If any one question"s what TMS power pulleys will do feel free to call them Its a 1 800 number ,Theyll be glad to assist you with there facts and knowledge !

AJV Youre more then partially right , Power pulleys will assist you Reduce loss of drag and add more HP and Tourque Its a simple as that , For those who seem to differ let me ask you this , Its known that splitters and wings help the areo dynamics and etc of a car right ! Whould wouldnt power pulleys not play a role when they reduce drag ?
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Old 06-14-2011, 03:13 PM   #72
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AJV Youre more then partially right , Power pulleys will assist you Reduce loss of drag and add more HP and Tourque Its a simple as that , For those who seem to differ let me ask you this , Its known that splitters and wings help the areo dynamics and etc of a car right ! Whould wouldnt power pulleys not play a role when they reduce drag ?
these don't reduce drag from wind resistance. these reduce drag from the pulleys on the belt then from the engine having to move them. they do less revolutions because the pulleys are larger. they don't "add" hp or tq as described. they free up parasitic losses from having to drive the belt. now how much is lost on a particular engine and how much can be "freed up" varies. on the E46 non-M very very little.
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Old 06-14-2011, 03:17 PM   #73
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Why does it matter if the car is a m or not. There shouldn't be a difference. If it doesn't work for non-m why would it work for a m?
This works on freeing up lost power from driving the belt accessories per revolution. Since the M3 has a much higher redline and power band in the higher range it can take advantage of this.
While an engine that redlines and ends 2K rpm before doesn't is the reasoning.
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Old 06-14-2011, 03:20 PM   #74
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my 2 cents, pullies will throw off the engines balance due to the harmonic balancer in the engine. from what i have studied atleast. My professor told me if your willing to change pullies then you will have to get the engine rebalanced.
that is only on kits that do the harmonic balancer. these kits don't do that, they are pulleys on the auxiliary components like the waterpump and power steering (sometimes alternator)

*but yes, if you mess with the harmonic balancer you're in for trouble
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Old 06-14-2011, 03:23 PM   #75
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these don't reduce drag from wind resistance. these reduce drag from the pulleys on the belt then from the engine having to move them. they do less revolutions because the pulleys are larger. they don't "add" hp or tq as described. they free up parasitic losses from having to drive the belt. now how much is lost on a particular engine and how much can be "freed up" varies. on the E46 non-M very very little.
Buddy , Its exactly what I said , I never mentioned that they reduce drag from wind resistance, What I said was "Power pulleys will assist you Reduce loss of drag and add more HP and Tourque "In theory , That youll gain that lost HP and Tourque from the loss of drag !

Do you own a set of pulleys ?To justify that on the E46 non-M very very little ?

From what I understand this will be effective at 5 k rpm"s !

On going debate ..Like I said If any one has Installed them and has an actuall dyno on them showing me no gains at all then Ill shut my mouth untill then I stand bye TMS and there product!

Last edited by 323I00; 06-14-2011 at 03:26 PM.
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Old 06-14-2011, 03:57 PM   #76
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Buddy , Its exactly what I said , I never mentioned that they reduce drag from wind resistance, What I said was "Power pulleys will assist you Reduce loss of drag and add more HP and Tourque "In theory , That youll gain that lost HP and Tourque from the loss of drag !

Do you own a set of pulleys ?To justify that on the E46 non-M very very little ?

From what I understand this will be effective at 5 k rpm"s !
Yes I have a set installed for years, even listed in my sig. Do you?

And no that example and what you said are not the same.
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Old 06-14-2011, 05:33 PM   #77
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Yes I have a set installed for years, even listed in my sig. Do you?

And no that example and what you said are not the same.
Buddy hate to break It to you but Im not talking Indian or pakistanian , Its pure english no diffrent then youres !

I simply wrote "Power pulleys will assist you Reduce loss of drag and add more HP and Tourque Its a simple as that " "Why wouldnt power pulleys not play a role when they reduce drag "

What does that mean ^ , seeing Its not clear enough 4 u , Power pulleys will give you the loss HP and Tourque that It produces from less drag time traveled with the oem pulleys.

Last edited by 323I00; 06-14-2011 at 05:34 PM.
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Old 06-14-2011, 06:21 PM   #78
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Buddy hate to break It to you but Im not talking Indian or pakistanian , Its pure english no diffrent then youres !

I simply wrote "Power pulleys will assist you Reduce loss of drag and add more HP and Tourque Its a simple as that " "Why wouldnt power pulleys not play a role when they reduce drag "

What does that mean ^ , seeing Its not clear enough 4 u , Power pulleys will give you the loss HP and Tourque that It produces from less drag time traveled with the oem pulleys.
We're not your buddies, guy. The way you are describing it makes it sound like horsepower is gained at the crank. Please realize the difference between HP and RWHP.

That being said, My M52tub28 is not stock by any stretch...and after this last set of mods I am pretty sure I'm approaching 19X RWHP and that is w/o headers. There is a definite feel with the pulleys and the Stewart pump. And sure I could have gone with OEM, but it's much more fun to blow by 330s and point to the stinger

Jake, I'm not sure how this would affect an auto...but if you want to you should go with RE, they came to my door for $202.xx in 3 days. Install was easy cause I was replacing my belts, pulleys, tensioners and cooling system. And since you have the electric fan, it will be much quicker Good luck!
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Old 06-14-2011, 06:58 PM   #79
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Ungh... You can call it drag or whatever you wish... You get nothing at the crank, NOTHING. All pulleys do is decrease the speed at which accessories are spinning to their lower operating limits. There is a factor of safety designed into car systems, and one of those safety factors is spinning accessories faster than absolutely necessary. By lowering the speed at which they spin, they aren't drawing as much power/energy/whatever you want to call it from the engine. As a result, the saved power can be directed to the rear wheels (and transfer case/front wheels for you XI people).

The amount of WHP you will gain (or lose) depends on lots of factors:
- What was the factor of safety on the stock pulley setup?
- How much friction was present in the stock setup and how much is present in the aftermarket setup?
- How loose/tight is the belt? Yes, the tension of a belt has considerable implications on how much power something draws - I design heavy equipment that is often belt driven, so I know what I'm talking about.

There's lots of theory behind pulley setups, intake systems, exhausts, etc. The magnitude of improvement (if any) is dependent on the original design, which BMW is often quite good at.
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Old 06-16-2011, 04:22 AM   #80
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We're not your buddies, guy. The way you are describing it makes it sound like horsepower is gained at the crank. Please realize the difference between HP and RWHP.
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Ungh... You can call it drag or whatever you wish... You get nothing at the crank, NOTHING. All pulleys do is decrease the speed at which accessories are spinning to their lower operating limits. There is a factor of safety designed into car systems, and one of those safety factors is spinning accessories faster than absolutely necessary. By lowering the speed at which they spin, they aren't drawing as much power/energy/whatever you want to call it from the engine. As a result, the saved power can be directed to the rear wheels.

The amount of WHP you will gain (or lose) depends on lots of factors:
- What was the factor of safety on the stock pulley setup?
- How much friction was present in the stock setup and how much is present in the aftermarket setup?
- How loose/tight is the belt? Yes, the tension of a belt has considerable implications on how much power something draws - I design heavy equipment that is often belt driven, so I know what I'm talking about.

There's lots of theory behind pulley setups, intake systems, exhausts, etc. The magnitude of improvement (if any) is dependent on the original design, which BMW is often quite good at.
Thanks guys, he just wasn't catching on. He's quiet now so maybe he's seen the light.
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Buddy hate to break It to you but Im not talking Indian or pakistanian , Its pure english no diffrent then youres !
well hate to break it to you Buddy, but actually you are not talking/writing english..."diffrent", "then", "youres"???

back to topic, you didn't answer the question I answered for you. Do you have these "power pulleys" installed on your car?
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