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      07-14-2016, 11:46 PM   #1
Bossdog
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Z4M Clutch slipping

My 2006 Z4MR has 41K miles, I acquired with 38K. After a weekend of autocross the clutch began to slip. When I accelerate aggressively, the RPM's race up, then slide back, then increase again as I keep the gas the same input.

It seems very few miles to need a new clutch???

A Local Transmission shop wants $3600 to replace the disc, pressure plate, throw-out bearing and Dual Mass flywheel. The OEM Flywheel selling for $1700

LuK has a Dual mass Flywheel for $410, is this an acceptable replacement?

Turner has one for $580, I'm not clear if that is OEM???

Tisher OEM is $1141 shipped and BMW of Atlanta is $1096 shipped

How do I know if the dual mass flywheel needs to be changed?

Thanks in advance for input.
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      07-14-2016, 11:53 PM   #2
N55_Mike
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You can go with this kit, seems reasonable.

https://www.turnermotorsport.com/p-8...FVBbfgod-wcClA
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      07-15-2016, 02:56 AM   #3
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Did you drive it with the sport button activated? If you did, DON'T! That thing will mess up the clutch fast in combination with the CDV (Clutch Delay Valve) if you do some spirited driving/Auto-X.

LuK is an OEM supplier and they make quality products.
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      07-15-2016, 05:28 PM   #4
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I do not use the sport button and recently removed the CDV. However, as I said, I just acquired the vehicle.
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      07-15-2016, 05:32 PM   #5
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Quote:
Originally Posted by N55_Mike View Post
You can go with this kit, seems reasonable.

https://www.turnermotorsport.com/p-8...FVBbfgod-wcClA
From what I have read, the lightweight flywheel is pretty noisy. I really do not want to add additional noise.
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      07-15-2016, 06:48 PM   #6
inTgr8r
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Quote:
Originally Posted by Bossdog View Post
From what I have read, the lightweight flywheel is pretty noisy. I really do not want to add additional noise.
There are driveability issues as well.
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      07-16-2016, 10:38 AM   #7
N55_Mike
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Oh okay, good to know!
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      07-16-2016, 10:51 AM   #8
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Quote:
Originally Posted by inTgr8r
Quote:
Originally Posted by Bossdog View Post
From what I have read, the lightweight flywheel is pretty noisy. I really do not want to add additional noise.
There are driveability issues as well.
There are destroying your motor issues as well lol .
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      07-16-2016, 01:03 PM   #9
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Quote:
Originally Posted by Bossdog View Post
It seems very few miles to need a new clutch???
I don't have any suggestions for replacement parts, but you're right, that is very few miles to need a clutch. Do you know the history and driving habits of the previous owner. Have you had a blackstone oil report done? If not I highly recommend it in case the previous owner spent allot of time near redline (they may have since the clutch is spent at 41k) which can prematurely wear out the rod bearings.
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      07-16-2016, 01:23 PM   #10
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Blackstone report sounds like a good idea to me too. Clutch shot at 41K miles indicates one of two things:
  • novice driver
  • car was flogged
Considering the car I lean towards the latter.
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      08-03-2016, 06:50 AM   #11
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Sport button messing up the clutch? That's new news to me....id go with the notion that previous owner beat the snot out of the car.
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      08-04-2016, 05:12 AM   #12
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Quote:
Originally Posted by WickedNy View Post
Sport button messing up the clutch? That's new news to me....id go with the notion that previous owner beat the snot out of the car.
Well, the sport button fucks up the throttle response making it too sensitive and that creates a perfect storm for slipping the clutch while doing some spirited driving. The throttle response is awesomely linear without the sport button, don't understand why anyone would want to get rid of that. It doesn't give you anything in an M except for the fucked up throttle response.
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      08-04-2016, 08:08 AM   #13
inTgr8r
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Quote:
Originally Posted by Westersund View Post
Well, the sport button fucks up the throttle response making it too sensitive and that creates a perfect storm for slipping the clutch while doing some spirited driving. The throttle response is awesomely linear without the sport button, don't understand why anyone would want to get rid of that. It doesn't give you anything in an M except for the fucked up throttle response.
I agree completely.
I can't count the number of times I've heard guys asking "why does this car jack rabbit so badly when starting off?"
Often, they are using sport mode.
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      08-04-2016, 11:36 AM   #14
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This comes to mind lol



Love sport mode btw, will admit it's tough in sandals though
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      08-04-2016, 01:30 PM   #15
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Quote:
Originally Posted by yousefnjr View Post
This comes to mind lol
....................
lol, what a dipshit!
Pretty bad if he can tell the difference between cutch and rubber smoke.
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      08-05-2016, 03:11 AM   #16
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Quote:
Originally Posted by yousefnjr View Post
This comes to mind lol
This came to mind for me.

Quote:
Originally Posted by yousefnjr View Post
Love sport mode btw, will admit it's tough in sandals though
Over 140k miles in sport mode. Clutch is fine.
OP's PO must have been PoS.
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Last edited by StickMon; 08-05-2016 at 01:58 PM.
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      08-05-2016, 12:14 PM   #17
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Quote:
Originally Posted by StickMon View Post

Over 140k miles in sport mode. Clutch is fine.
Amazing! Love hearing stories like this
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      08-06-2016, 09:53 AM   #18
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Quote:
Originally Posted by Bossdog View Post
From what I have read, the lightweight flywheel is pretty noisy. I really do not want to add additional noise.
Clutches will wear, regardless of mileage. Previous owner could have abused it (it's what these cars are great for!). You really should attempt to locate another Z4 (or any other vehicle for that matter) who uses an aluminum flywheel (or single mass), and sprung disc/aftermarket clutch setup, and drive it around. The chatter isn't all that bad depending what disc you go for (go for full face, not a puck setup). Pedal engagement is still fantastic.

I run a setup on my Supra and never looked back.

In the end, you save hundreds to thousands of dollars for clutch, flywheel and pressure plate vs. going all OEM replacement. You should resurface or replace the flywheel (I believe dual mass flywheels are non-serviceable). TurnerMotorsports option linked above is a good one, also Clutchmasters sells a complete kit for the Z4M.
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