rattle at idle LWFW need some opinions
Registered User
Joined: Jan 2007
Posts: 10,774
From: OR Room 5
Rep Power: 1007
I am not so sure this is true. The constant rattle from the lack of dampening leads to vibrations in the transmission, enough so that in some GT3 conversions (GT3 owners switching to LWFW like the GT3RS) had problems with the drive pulley. In fact, Porsche sent a TSB to dealerships with regard to the 997 GT3:
October 15, 2008.
Technical InformationService
36/08 ENU 1360 1
GT3 Engine: Flywheel and Pulley
Vehicle Type: 911 GT3 (997)
Model Year: As of 2007
Concerns: Flywheel and pulley
Information: Replacing dual-mass flywheel with single-mass flywheel.
We have discovered that the dual-mass flywheel, which is installed as standard in the GT3 engine (vehicle type 997810/-811), is being replaced in the dealer organization with the single-mass flywheel from the GT3 RS engine (vehicle type 997850/-851).
Information
Due to an increasing number of reported faults, we expressly wish to point out that the installation of the single-mass flywheel (from the GT3 RS) in the GT3 engine is not approved by Porsche.
Since the 911 GT3 (997) engine application is designed for the dual-mass flywheel, conversion to the single-mass flywheel results in the following problems and consequences:
• The single-mass flywheel causes fluctuations and vibration in the lower rpm range, thereby reducing the smooth-running performance of the engine.
• The crankshaft is subjected to one-sided loading, causing stress peaks that can result in damage to the crankshaft.
• The one-sided loading of the crankshaft can cause the pulley to come loose, resulting in damage to the belt drive and engine.
• Any damage relating to conversion or damage that can be attributed to conversion is not covered under warranty.
Please advise your customers of this information accordingly.
©Porsche Cars North America, Inc.
October 15, 2008
Anyone check their pulley torque recently?
October 15, 2008.
Technical InformationService
36/08 ENU 1360 1
GT3 Engine: Flywheel and Pulley
Vehicle Type: 911 GT3 (997)
Model Year: As of 2007
Concerns: Flywheel and pulley
Information: Replacing dual-mass flywheel with single-mass flywheel.
We have discovered that the dual-mass flywheel, which is installed as standard in the GT3 engine (vehicle type 997810/-811), is being replaced in the dealer organization with the single-mass flywheel from the GT3 RS engine (vehicle type 997850/-851).
Information
Due to an increasing number of reported faults, we expressly wish to point out that the installation of the single-mass flywheel (from the GT3 RS) in the GT3 engine is not approved by Porsche.
Since the 911 GT3 (997) engine application is designed for the dual-mass flywheel, conversion to the single-mass flywheel results in the following problems and consequences:
• The single-mass flywheel causes fluctuations and vibration in the lower rpm range, thereby reducing the smooth-running performance of the engine.
• The crankshaft is subjected to one-sided loading, causing stress peaks that can result in damage to the crankshaft.
• The one-sided loading of the crankshaft can cause the pulley to come loose, resulting in damage to the belt drive and engine.
• Any damage relating to conversion or damage that can be attributed to conversion is not covered under warranty.
Please advise your customers of this information accordingly.
©Porsche Cars North America, Inc.
October 15, 2008
Anyone check their pulley torque recently?
Last edited by bbywu; Oct 12, 2009 at 12:27 PM.
Registered User
Joined: Apr 2008
Posts: 5,214
From: Colorado
Rep Power: 398
I am not so sure this is true. The constant rattle from the lack of dampening leads to vibrations in the transmission, enough so that in some GT3 conversions (GT3 owners switching to LWFW like the GT3RS) had problems with the drive pulley. In fact, Porsche sent a TSB to dealerships with regard to the 997 GT3:
October 15, 2008.
Technical InformationService
36/08 ENU 1360 1
GT3 Engine: Flywheel and Pulley
Vehicle Type: 911 GT3 (997)
Model Year: As of 2007
Concerns: Flywheel and pulley
Information: Replacing dual-mass flywheel with single-mass flywheel.
We have discovered that the dual-mass flywheel, which is installed as standard in the GT3 engine (vehicle type 997810/-811), is being replaced in the dealer organization with the single-mass flywheel from the GT3 RS engine (vehicle type 997850/-851).
Information
Due to an increasing number of reported faults, we expressly wish to point out that the installation of the single-mass flywheel (from the GT3 RS) in the GT3 engine is not approved by Porsche.
Since the 911 GT3 (997) engine application is designed for the dual-mass flywheel, conversion to the single-mass flywheel results in the following problems and consequences:
• The single-mass flywheel causes fluctuations and vibration in the lower rpm range, thereby reducing the smooth-running performance of the engine.
• The crankshaft is subjected to one-sided loading, causing stress peaks that can result in damage to the crankshaft.
• The one-sided loading of the crankshaft can cause the pulley to come loose, resulting in damage to the belt drive and engine.
• Any damage relating to conversion or damage that can be attributed to conversion is not covered under warranty.
Please advise your customers of this information accordingly.
©Porsche Cars North America, Inc.
October 15, 2008
Anyone check their pulley torque recently?
October 15, 2008.
Technical InformationService
36/08 ENU 1360 1
GT3 Engine: Flywheel and Pulley
Vehicle Type: 911 GT3 (997)
Model Year: As of 2007
Concerns: Flywheel and pulley
Information: Replacing dual-mass flywheel with single-mass flywheel.
We have discovered that the dual-mass flywheel, which is installed as standard in the GT3 engine (vehicle type 997810/-811), is being replaced in the dealer organization with the single-mass flywheel from the GT3 RS engine (vehicle type 997850/-851).
Information
Due to an increasing number of reported faults, we expressly wish to point out that the installation of the single-mass flywheel (from the GT3 RS) in the GT3 engine is not approved by Porsche.
Since the 911 GT3 (997) engine application is designed for the dual-mass flywheel, conversion to the single-mass flywheel results in the following problems and consequences:
• The single-mass flywheel causes fluctuations and vibration in the lower rpm range, thereby reducing the smooth-running performance of the engine.
• The crankshaft is subjected to one-sided loading, causing stress peaks that can result in damage to the crankshaft.
• The one-sided loading of the crankshaft can cause the pulley to come loose, resulting in damage to the belt drive and engine.
• Any damage relating to conversion or damage that can be attributed to conversion is not covered under warranty.
Please advise your customers of this information accordingly.
©Porsche Cars North America, Inc.
October 15, 2008
Anyone check their pulley torque recently?
very interesting. So how do they account for this on a car that runs 24 hours at 7-8k rpm?
Also, they call it a concern. I would be interested to see how many failures there has been if any concerning this.
Registered User
Joined: Jun 2007
Posts: 758
From: DW from CT
Rep Power: 53
i had my idle taken up to 900 and if you push a little on the stick while at a traffic light that will quiet it down as well. after have a lwfw for 3 years, i cant imagine going back to stock dual mass, it revs so fast and the downshifts basically dont even need a blip. the dual mass also gets rid of a 2500 rpm "wabbling" drone and noise which i have noticed extreme with k16 turbos but pretty much gone with larger turbos. also the dual mass helps smooth modulation of throttle. porsche knew what this car needed, a heavy heavy FW, but for me its worth the pain for the pleasure.
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