Time for a new clutch, looking for a mild option - Page 2 - BMW M5 Forum and M6 Forums
E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

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post #11 of 29 Old 13th December 2014, 09:47 PM
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Quote:
Originally Posted by PumpinIron View Post
Thanks for all that info, it helps!

I've read about numerous people having their stock clutch setups last over 100k. I suspect I could easily be one of those people since I never dump the clutch, I don't drag race, and I don't take it to the track either. For me it's just a fun weekend car that we take on long highway trips and what not.

However, it does sound discouraging that the same clutch is used in the 540i which has significantly less horsepower. There's two clutches I'm looking at (aside from stock) and those are as follows:

ECS News BMW E39 M5 South Bend Clutch Kits - K70282HDO - Stage 2 Daily Clutch Kit - ES#2725258
FX Racing Stage 2 Rigid Clutch Kit 2000-03 BMW M5 E39 Z8 E52 S62B50 4.9L V8 DOHC

Now, the Gripforce clutch is significantly cheaper and seems to be rated for higher horsepower than stock while still being a good street solution. I question the cost of some of these aftermarket clutches as I suspect some of them are made by the same supplier just branded with different names and therefore higher prices. I know this is the case with automotive batteries. There are only a handful of battery makers, but once they apply a brand name to them they sell them for more regardless of if they're made by the same manufacturer.

I'm just going to go with the LUK DMF flywheel (the stock one). I found it for $387 brand new which is a good deal. My car has 165k and while they are all easy miles, I know it's the stock flywheel in there so any attempt to resurface it would be pointless when I can get a new flywheel for such a cheap price.

I guess all it comes down to now is the clutch. I have no big power plans for this car. I plan on getting an Evolve Tune, Evolve headers, and maybe down the road some Shrick cams and some headwork. That's it though, I won't go beyond that. So, in the end I suspect my car would never see more than 400rwhp (with all of those mods) on a very good day.

Remember, just hp is not that hard on a clutch once you are moving. And if you heel and toe (rev matching) when pushing the car, you take the strain off the synchros.

I think the real weak link in the stock setup is the self adjusting mechanism (SAC). I suspect that if you replace the pressure plate and disc without the SAC and you are an intelligent driver, you will be fine. At under $400, I would get the new DMF.

As to power plans, if you get to 400 at the wheels, that is basically Dinan S2 level, about 470 at the crank. That is pretty healthy.

I am pleased with my CNS notwithstanding the questionable marketing practices. It does not take away from the quality or design of the product.

Regards,
Jerry

'01 Black/caramel
Dinan Stage 3 suspension, SS jet coated headers, ESS SC kit w/ 1 range colder NGK's, 92mm pulley, 440 Big Greens, TTFS alpha N tune for meth, RK plenum plates, SBC Endurance Stage 3 Kevlar performance clutch setup, "Jed" lightened DMFW, open brake ducts, TEC cupholder, U.S.(Euro style) tilt/slide armrest, 6k HID fogs, Umnitza bi-xenon flamethrowers w/6k super white low beams, rear fogs, V1/Stealth1, dual head LI, 2.65 diff w/40% lockup/2x dynamic, compact spare, M5 logo trunk carpet, Euro trailer hitch, Mocal oil cooler, ACS type rear spoiler, Rogue custom SSK and tranny mounts, ST 355 BBK (fronts), BP sway bar brackets, Bluetooth retrofit, Speedhut boost gauge (20 psi), Dinan TB's and VS, KB BAP, Howerton/HFS-3 Aquamist WI trunk setup (50/50), with 2nd gauge in rear view mirror, aftermarket trunk mounted sound system integrated into stock unit (amps, crossovers, sub and speakers).......
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post #12 of 29 Old 13th December 2014, 09:49 PM
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post #13 of 29 Old 14th December 2014, 12:10 AM Thread Starter
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I always, always, always rev match between shifts, that's just a habit I've been in since I was a kid. So, that's no an issue at all.

I'm going to go with the factory LUK DMF flywheel and one of these clutch kits. I'm worrying too much about having some high horsepower clutch when in reality the most I'll ever see is 400 at the wheels, and even then, I won't be driving it like some teenager.
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post #14 of 29 Old 14th December 2014, 11:45 PM
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Originally Posted by M3Fan View Post
FWIW my flywheel was in perfect shape after 130K, I felt guilty changing it. No additional play between the two halves vs. a brand new one and machining marks in the surface still totally crisp and perfect. Unless there is a problem with it I wouldn't be so quick to change the DMF as a wear item.
I would agree that depending on the clutch wear not all dual mass flywheels have to be changed; however when we get a client's car that needs a clutch change on these bmw e39s and they have over 120k we recommend changing the DMF at time of the clutch. It's a good piece of mind measure.
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post #15 of 29 Old 14th December 2014, 11:58 PM
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It is a solid bit of kit, I have 45K miles on mine...
By the way does your CNS clutch and flywheel kit work and sound like stock?meaning no rattle at idle or clutch chatter upon engagement?

Regards

Jay

Last edited by jsdsm5; 14th December 2014 at 11:59 PM.
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post #16 of 29 Old 15th December 2014, 12:14 AM
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Indeed it does, no chatter at all, ever. CNS takes the stock dual mass flywheel and shaves it down to remove the weight, so you're left with all the benefits of a dual mass, but much lighter than stock kit.
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post #17 of 29 Old 15th December 2014, 12:21 AM Thread Starter
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If all CNS is doing is taking the stock flywheel and shaving it to remove weight, it seems a bit crazy that they would charge $1600 for it:
BMW E39 M5 CNS Racing Lightweight Dual-Mass Flywheel for OEM Clutch

Am I wrong in thinking that? I mean I can get the stock LUK dual mass flywheel for under $400. Couldn't I just take that to a machine shop and have them lighten it, or am I missing something?
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post #18 of 29 Old 15th December 2014, 12:25 AM
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Originally Posted by PumpinIron View Post
If all CNS is doing is taking the stock flywheel and shaving it to remove weight, it seems a bit crazy that they would charge $1600 for it:
BMW E39 M5 CNS Racing Lightweight Dual-Mass Flywheel for OEM Clutch

Am I wrong in thinking that? I mean I can get the stock LUK dual mass flywheel for under $400. Couldn't I just take that to a machine shop and have them lighten it, or am I missing something?
Dinan charges a similar amount. There's a thread on here somewhere with the machining dimensions, but I don't know if anyone has ever gone that route... should certainly be possible though.
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post #19 of 29 Old 15th December 2014, 12:27 AM
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post #20 of 29 Old 15th December 2014, 12:36 AM
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