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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 02-06-2013, 06:03 AM
Husband Husband is offline
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Clutch replacement

Hey guys,

Newbie on the forums. I have an E92 335xi and I am looking at getting JB4, DPs, intake and exhaust this summer and noticed that virtually nobody is talking about clutch replacement on these boards.

The above mods will bring the car from ~275whp to close to 400 (if not over), so I doubt that the stock clutch can take that kind of a beating.

What brand/model clutches are you guys using and what are your impressions?

Thanks!
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  #2  
Old 02-06-2013, 06:36 AM
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GarySL GarySL is offline
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The stock clutch will more than handle those loads. It's the individual poor driving style that ruins clutches & added torque will accentuate that.

g/l
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  #3  
Old 02-06-2013, 06:51 AM
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lqaddict lqaddict is offline
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Quote:
Originally Posted by Husband View Post
Hey guys,

Newbie on the forums. I have an E92 335xi and I am looking at getting JB4, DPs, intake and exhaust this summer and noticed that virtually nobody is talking about clutch replacement on these boards.

The above mods will bring the car from ~275whp to close to 400 (if not over), so I doubt that the stock clutch can take that kind of a beating.

What brand/model clutches are you guys using and what are your impressions?

Thanks!
Did you own an STI/WRX before your E92?
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  #4  
Old 02-06-2013, 07:18 AM
Husband Husband is offline
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Originally Posted by lqaddict View Post
Did you own an STI/WRX before your E92?
Nope. I'm a Toyota man - owned a RAV4 and a couple MR2s over the past few years.

I've gotta be honest, I'm skeptical and surprised that an OEM clutch can handle a ~40-50% increase in HP/TQ.
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Old 02-06-2013, 08:55 AM
mr_bean mr_bean is offline
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I agree with Gary. If you jump off the line and ask the clutch to absorb all that power you'll wear it out in no time. If you ease out the clutch gently and wait until your left foot is off the pedal before smashing the accelerator, then the stock clutch will hold up just fine.
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  #6  
Old 02-06-2013, 09:18 AM
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So is it safe to say that you guys are pushing 350-400whp with a stock clutch then? How many miles on it? I'd like to hear from someone who has done this.
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Old 02-06-2013, 09:24 AM
Strongmad Strongmad is offline
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Isn't the clutch/transmission in the 335 is the same as the one from the e39 M5, which had 400hp? Should be fine.
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  #8  
Old 02-06-2013, 10:11 AM
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DSXMachina DSXMachina is offline
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Don't worry about your clutch in that E92. You have a torque safety valve called limited traction. Long before you grenade your clutch your right rear tire will be doing a smoke show.
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Old 02-06-2013, 10:49 AM
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Clutch will be fine for a while, but the the vibration from the dual mass flywheel under high boost/load at low rpms will be there. I have had 2 tuned manual 335's and both clutches have been fine accept for the vibration.
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Old 02-06-2013, 11:03 AM
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Quote:
Originally Posted by David1 View Post
Clutch will be fine for a while, but the the vibration from the dual mass flywheel under high boost/load at low rpms will be there. I have had 2 tuned manual 335's and both clutches have been fine accept for the vibration.
I thought dual-mass flywheels are supposed to lessen vibration in the drive train?
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You will rue this day, RUE THIS DAY

Last edited by cwinter; 02-06-2013 at 11:22 AM.
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  #11  
Old 02-06-2013, 11:09 AM
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lqaddict lqaddict is offline
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Quote:
Originally Posted by Husband View Post
Nope. I'm a Toyota man - owned a RAV4 and a couple MR2s over the past few years.

I've gotta be honest, I'm skeptical and surprised that an OEM clutch can handle a ~40-50% increase in HP/TQ.
The reason I asked because it is a prevalent subject among WRX/STI crowd

Last edited by lqaddict; 02-06-2013 at 11:13 AM.
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  #12  
Old 02-06-2013, 02:26 PM
daytrader daytrader is offline
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Originally Posted by DSXMachina View Post
Don't worry about your clutch in that E92. You have a torque safety valve called limited traction. Long before you grenade your clutch your right rear tire will be doing a smoke show.
Is that the CDV you refer to? The one that most seem to like to delete?
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Old 02-07-2013, 05:47 AM
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Originally Posted by cwinter View Post
I thought dual-mass flywheels are supposed to lessen vibration in the drive train?
Not once the springs get fully compressed in the flywheel.
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  #14  
Old 02-07-2013, 08:17 AM
jburke4689 jburke4689 is offline
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Originally Posted by daytrader View Post
Is that the CDV you refer to? The one that most seem to like to delete?
He isn't talking the CDV, he is saying that your tires will spin before your clutch explodes. The 335i doesn't have a locking rear diff like the M3.
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  #15  
Old 02-07-2013, 08:56 AM
daytrader daytrader is offline
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Originally Posted by jburke4689 View Post
He isn't talking the CDV, he is saying that your tires will spin before your clutch explodes. The 335i doesn't have a locking rear diff like the M3.
Yeah that makes sense, lighting them up has never been much of a problem.
OK thanks, no way I would ever find my pulled CDV anyway!
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Old 02-08-2013, 08:18 AM
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cwinter cwinter is offline
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Quote:
Originally Posted by David1 View Post
Not once the springs get fully compressed in the flywheel.
So the benefits of this are negated once the clutch is fully dis-engaged? Seems silly to (me) to reduce rattle/noise during shifting while introducing rattle while the clutch is disengaged, considering you spend much more time in gear than out of gear shifting. Blurb from an AMS Automotive...

Quote:
Dual-mass flywheels were originally developed to reduce synchronizer wear, gear noise, and chassis rattle in high-torque diesel applications like 7.3L Ford and 6.5L GM trucks. However, because dual-mass flywheels were so effective in improving shifting action while reducing noise, vibration, and harshness (NVH), they were soon adapted for use in high-performance applications including Audi TT, BMW 325, Chevy Corvette, and Porsche Boxster. Lately, dual-mass flywheels have found their way into more every-day vehicles like Acura TL, Ford Focus, Hyundai Sonata, and Nissan Altima.
http://www.amsautomotive.com/flywheels_dualmass.php
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You will rue this day, RUE THIS DAY

Last edited by cwinter; 02-08-2013 at 08:20 AM.
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  #17  
Old 02-08-2013, 09:34 AM
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Quote:
Originally Posted by cwinter View Post
So the benefits of this are negated once the clutch is fully dis-engaged? Seems silly to (me) to reduce rattle/noise during shifting while introducing rattle while the clutch is disengaged, considering you spend much more time in gear than out of gear shifting. Blurb from an AMS Automotive...



http://www.amsautomotive.com/flywheels_dualmass.php
No, the OEM DM flywheel maxes out it's vibration dampening capability when highly tuned.
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