Menu toggle

Drivetrain Judder on downshift

GregBarton78

PCGB Member
Member
Just got back from Le Mans with my S2 - loads of positive stuff (I’m alive, it didn’t break etc etc).

A couple of issues did occur - starter motor solenoid a bit sticky and it really didn’t want to work on the Ferry but went on the 8th attempt and behaved thereafter.


What is puzzling me is the massive judder I get on any downshift into 2nd gear if I don’t blip the throttle to match the revs. Most prevalent at low speed, only ever happens going into 2nd gear - there’s a significant judder throughout the drivetrain from the back of the car if I engine brake at all.


Checked the clutch wear before leaving and there’s 50% life in the clutch. It’s never slipped and bite point is in the middle of the pedal.

The judder is only in 2nd gear And only on downshifts without rev matching.

The car has done 140k miles. It is perhaps sitting a touch low at the rear (suspect tired torsion bar - I replaced all the shocks and new struts built last year), car is on 17” wheels but otherwise standard. It just had a new cat-back exhaust made at Tony Banks but that shouldn’t affect anything.

likely suspects? Clutch? Transaxle mounts?

 
I had similar symptoms with my S2 at similar miliage and it was the clutch - not the wear plate but the rubber donut centre that was failing.

So if you still have the original rubber donut clutch you may have the same problem.

 
IanK said:
I had similar symptoms with my S2 at similar miliage and it was the clutch - not the wear plate but the rubber donut centre that was failing.

So if you still have the original rubber donut clutch you may have the same problem.



My first thought was rubber centred clutch too. I had this on my old 2.7 when the rubber split - it was banging off the safety bars every time you came off the power or got back on it. That’s the only thing making me question it as you said it’s coming down into 2nd gear only - might just be starting to go. A clutch job is rather involved unfortunately, not difficult per se, but lots of parts to remove.
 
Yes same in my first 944 (clutch), could hardly get it into 2nd gear and the rubber centre had disintegrated when it was removed.
 

Posts made and opinions expressed are those of the individual forum members

Use of the Forum is subject to the Terms and Conditions

Disclaimer

The opinions expressed on this site are not necessarily those of the Club, who shall have no liability in respect of them or the accuracy of the content. The Club assumes no responsibility for any effects arising from errors or omissions.

Porsche Club Great Britain gives no warranties, guarantees or assurances and makes no representations or recommendations regarding any goods or services advertised on this site. It is the responsibility of visitors to satisfy themselves that goods and/or services supplied by any advertiser are bona fide and in no instance can the Porsche Club Great Britain be held responsible.

When responding to advertisements please ensure that you satisfy yourself of any applicable call charges on numbers not prefixed by usual "landline" STD Codes. Information can be obtained from the operator or the white pages. Before giving out ANY information regarding cars, or any other items for sale, please satisfy yourself that any potential purchaser is bona fide.

Directors of the Board of Porsche Club GB, Club Office Staff, Register Secretaries and Regional Organisers are often requested by Club members to provide information on matters connected with their cars and other matters referred to in the Club Rules. Such information, advice and assistance provided by such persons is given in good faith and is based on the personal experience and knowledge of the individual concerned.

Neither Porsche Club GB, nor any of the aforementioned, shall be under any liability in respect of any such information, advice or assistance given to members. Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times.

Back
Top