07-22-2010, 10:15 AM
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#1
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Registered User
Join Date: Sep 2004
Location: Atlanta
Posts: 1,820
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Quote:
Originally Posted by Boxtaboy
Yes, but that's 3 clutches to one clutch plus a flywheel replacement (assuming 50k, 100k, and 150k clutch change intervals vs. one new clutch and a flywheel at 150k. Which one ends up costing more? By 100k, he may have decided to sell the car, and thus, he even can leave the next clutch change to the next owner.
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it's my understanding that these flywheels (DMF) cannot be resurfaced because of the elastomer between the FW pieces. if that's the case, a proper clutch job would include a flywheel even at 50k. it's that, or you use the old one w/ its glaze & hot spots, thus reducing the life of the clutch you just installed.
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07-22-2010, 12:26 PM
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#2
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There Is No Substitute.
Join Date: May 2007
Location: West Coast
Posts: 3,253
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I took my Boxster by dad's (very honest, but non-Porsche) mechanic and he said that the clutch felt fine and he didn't detect any slipping. I also tried the uphill test mentioned earlier three times. I was going about 30mph and shifted from 2nd to 5th and floored it, the RPM's dropped lower then stabilized and I was crawling up the hill. Which I think means it is not slipping.
This mechanic has reasonable prices but I am not too fond of being lied too. I am going to hold off until the clutch is noticeably failing, and from what I found out it only takes a day to get the clutch replaced.
Thanks again for the great advice! (You guys just saved me $1300, for now)
__________________
1999 Ocean Blue Metallic Boxster - blueboxster.com
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07-22-2010, 12:49 PM
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#3
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Engine Surgeon
Join Date: Aug 2008
Location: Cleveland GA USA
Posts: 2,425
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Quote:
This mechanic has reasonable prices but I am not too fond of being lied too. I am going to hold off until the clutch is noticeably failing, and from what I found out it only takes a day to get the clutch replaced
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Then be prepared to buy a new, 1000.00 flywheel.
__________________
Jake Raby/www.flat6innovations.com
IMS Solution/ Faultless Tool Inventor
US Patent 8,992,089 &
US Patent 9,416,697
Developer of The IMS Retrofit Procedure- M96/ M97 Specialist
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07-22-2010, 02:16 PM
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#5
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07 Carrera S Cab
Join Date: Nov 2005
Location: New Jersey
Posts: 2,273
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Quote:
Originally Posted by blinkwatt
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Hey, thanks for that link Blink! Good price!
__________________
Current: 07 Carrera S Cab in Midnight Blue
Previous: 01 Boxster in Arctic Silver, 86 944 in Guards Red
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07-23-2010, 08:25 AM
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#6
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Registered User
Join Date: Jul 2010
Location: West Chester, PA
Posts: 211
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If you were doing 30mph in 5th in a boxster uphill and it didn't shoot up in RPMs when you floored it, then your clutch friction material is fine. It might be worn down, but it's not slipping.
Jake Raby has far far more experience than I do, but my take is that if your clutch isn't slipping than your CLUTCH isn't abusing or degrading your flywheel life.
Your flywheel itself might be out of spec, but I doubt your clutch is making it worse.
Just keep driving it. When it starts to slip, it'll slip in 5th gear mostly at first. PREVENT THE CLUTCH from slipping. Downshift.
Once it starts slipping, it's on it's way out. But some people can get 20k out of a slipping clutch, while others get 2-3 days. A slipping clutch is what will also ensure that you flywheel needs replacement, as the more it slips the more abuse the flywheel starts to take.
Seems to me like the smart money move is to replace both clutch & flywheel together, unless you are the type that finds pulling the trans on a saturday morning a fun thing and are willing to try to just do the clutch.
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07-23-2010, 09:53 AM
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#7
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Engine Surgeon
Join Date: Aug 2008
Location: Cleveland GA USA
Posts: 2,425
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What degrades the flywheel surface and renders it non serviceable is the rivets from the clutch disc contacting the flywheel surface.
What makes the clutch slip is reduced clamping force from the pressure plate being exerted on the disc because it has worn its self too thin. In my experience the rivets of the clutch disc contact the flywheel surface BEFORE the disc wears thin enough to lose clamping pressure and slip.
This is why once the clutch has worn far enough to slip, the flywheel surface has already been compromised in 90% of instances.
A slipping clutch is the sign of a completely compromised clutch. Preventive action in this area just plain makes sense and is much less painful on the wallet than doing whats required only when it is required.
__________________
Jake Raby/www.flat6innovations.com
IMS Solution/ Faultless Tool Inventor
US Patent 8,992,089 &
US Patent 9,416,697
Developer of The IMS Retrofit Procedure- M96/ M97 Specialist
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07-22-2010, 01:50 PM
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#8
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07 Carrera S Cab
Join Date: Nov 2005
Location: New Jersey
Posts: 2,273
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Quote:
Originally Posted by rick3000
I took my Boxster by dad's (very honest, but non-Porsche) mechanic and he said that the clutch felt fine and he didn't detect any slipping. I also tried the uphill test mentioned earlier three times. I was going about 30mph and shifted from 2nd to 5th and floored it, the RPM's dropped lower then stabilized and I was crawling up the hill. Which I think means it is not slipping.
This mechanic has reasonable prices but I am not too fond of being lied too. I am going to hold off until the clutch is noticeably failing, and from what I found out it only takes a day to get the clutch replaced.
Thanks again for the great advice! (You guys just saved me $1300, for now) 
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Good for you! Let us know how long it ends up lasting!
__________________
Current: 07 Carrera S Cab in Midnight Blue
Previous: 01 Boxster in Arctic Silver, 86 944 in Guards Red
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