TT vibration damper
03-03-2012, 04:47 PM
#1
Three Wheelin'
Thread Starter
TT vibration damper
I am trying to decide if I will reinstall the TT vibration damper or not. The damper is in good condition but I am not sure it will do another 25 years 
.
I know that, when using the super bearings, the damper can be removed without causing any issues but what about removing it using Porsche's carriers/bearings setup ?
.I know that, when using the super bearings, the damper can be removed without causing any issues but what about removing it using Porsche's carriers/bearings setup ?
03-03-2012, 09:56 PM
#3
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The driveline vibration saga thread has a post in it with a nice WSM diagram and write up which explains how the vibration dampener does help to squelch driveline harmonic vibrations at specific RPM ranges for both the 5 speed and auto TTs.
Leaving it out could cause you to have some vibrations.
Leaving it in could cause problems later. Here is the result of one that came apart and was rubbing against the drive shaft a bit. The TT bearings were moved too.
Leaving it out could cause you to have some vibrations.
Leaving it in could cause problems later. Here is the result of one that came apart and was rubbing against the drive shaft a bit. The TT bearings were moved too.
03-04-2012, 06:27 AM
#4
Three Wheelin'
Thread Starter
You are referring to that diagram ...
03-04-2012, 07:17 AM
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Hi Luc,
Yes.
It is true that the vibration dampener was not placed into the TT on early 928 models but that was because the early 928 drivelines were attached to the battery box, IIRC, to dampen the vibrations.
The 928 CS models did not have them for weight savings since the CS model was the "sport edition" and Porsche did not believe some felt vibrations were a problem for those owners.
HTH,
Yes.
It is true that the vibration dampener was not placed into the TT on early 928 models but that was because the early 928 drivelines were attached to the battery box, IIRC, to dampen the vibrations.
The 928 CS models did not have them for weight savings since the CS model was the "sport edition" and Porsche did not believe some felt vibrations were a problem for those owners.
HTH,
03-04-2012, 07:25 AM
#6
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Only '78 MY used battery as damper. Cast damper was invented for '82 MY IIRR. There are thousands of '79-81 MY cars which have survived without it just fine.
03-04-2012, 08:01 AM
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Hi Erkka,
No worries about the 928 "surviving," that is not really the point.
More to the point is felt vibrations to the driver and passengers which can make driving their 928 tiring and uncomfortable, especially on long trips. We have helped and tried to help many owners chasing vibration problems in their 928s since they complain the vibratons take away the pleasure of the drive to them.
However some don't really mind and for short trips, small vibrations aren't really an issue for most.
Porsche has never been keen on putting more money than needed into anything. If Porsche was not receiving many complaints about vibrations, I can assure you Porsche would not have developed the vibration dampener and kept using it through the 928 GTS models.
With respect,
No worries about the 928 "surviving," that is not really the point.
More to the point is felt vibrations to the driver and passengers which can make driving their 928 tiring and uncomfortable, especially on long trips. We have helped and tried to help many owners chasing vibration problems in their 928s since they complain the vibratons take away the pleasure of the drive to them.
However some don't really mind and for short trips, small vibrations aren't really an issue for most.
Porsche has never been keen on putting more money than needed into anything. If Porsche was not receiving many complaints about vibrations, I can assure you Porsche would not have developed the vibration dampener and kept using it through the 928 GTS models.
With respect,
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03-04-2012, 10:12 AM
#8
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As I understand it damper is there to limit very specific movement caused by driving on motorways where road is consctructed from concrete blocks with seam between them every so often. This causes engine, TT & gearbox package to start oscillate directly against car body movement.
03-04-2012, 01:08 PM
#9
But the workshop manual says it's for residual unbalance at certain RPMs.
Now I'm really confused! Not the least about what residual unbalance is, in the first place, how it's limited to a particular RPM in the second place (harmonic of the TT or driveshaft, since its different for Auto and Manual?), and which part of the driveline is the source.
Now I'm really confused! Not the least about what residual unbalance is, in the first place, how it's limited to a particular RPM in the second place (harmonic of the TT or driveshaft, since its different for Auto and Manual?), and which part of the driveline is the source.
