After 186k, slipping clutch( occasional sticking pedal from 160k) I finally changed my clutch to ACS Extreme HD Single Mass. Only driven today but, can say:-
1. no noise diff or chatter at idle (if anything prob less chatter)
2. Occasional light clutter noise on first release. Not always
3.Occasionally light low speed lash, noise, through drivetrain whilst upshifting in corners.(again not always maybe different revs gear change)
4. Slightly quicker (maybe .05/s more responsive upshifts). Generally crisper feel.
5. In gear acceleration from lower revs a bit better.
6. Slightly different noise through the transmission during gear changes both up / down. Not more or less just different.
7. you can service this flywheel/ replace clutch plate - You cannot do this on Dual mass OEM flywheel -such a shame for $2.5k unit. Good HD Single mass is still over 2.1k fitted but many suppliers are quoting the same for both HD’s. Some more for dual.
I only went this way as I think it would improve response on an old engine with a slightly lighter flywheel & so far it feels that way. My car still has a great deal of torque with the exhaust and chip on the timing & having a solid flywheel feels right for it.
Its obviously too early to get a full judgement. So hopefully I’m not spewing in a years time.But the Heavy duty flywheel SM is not too much lighter than the dual and my understanding is the new clutch plate on the SM has more spring & material for dampening to compensate for the lighter solid mass. (not fully obviously).
Hopefully this helps. Will keep you posted if things change.
cheers
Elie