Originally Posted by jeepmor (Post 3442411)

I had a stage 2 SouthBend clutch installed a few months ago after the TOB failed. This is an Exedy clutch with 6 segments of their Feramic compound.

14 FRS at 87k manual trans car for reference. Put all new parts in down to a cerakoted bearing retainer, Verus fork and new subie TOB and flywheel. Only part I didn’t replace is the clutch pivot boss if I missed something.

Since then I can get some nasty bucking if trying to launch hard. It gets worse when after spirited driving for a good session. It’s tamed a bit since installation, but still occasionally it gets obnoxious. I was thinking it was break in norms, but it it has not stopped yet.

Also, I did have a Whiteline trans mount bushing installed. And lately, an HKS supercharger which has shown me how soft the bushing package really is making the issue more prevalent.

Now, to the solution space. I’m not sure if this is the engine/trans mount set or the rear end suspension bits. Any comments appreciated as to where to start. Which might just be buying a GoPro to see the problem.

My car is stock suspension wise other than the Whiteline trans bushing. I’d prefer an STI parts solution, but not sure if they address the rear end bushings with different parts like the STI grade engine and trans mounts.

Originally Posted by jeepmor (Post 3442411)

I had a stage 2 SouthBend clutch installed a few months ago after the TOB failed. This is an Exedy clutch with 6 segments of their Feramic compound.



14 FRS at 87k manual trans car for reference. Put all new parts in down to a cerakoted bearing retainer, Verus fork and new subie TOB and flywheel. Only part I didn’t replace is the clutch pivot boss if I missed something.



Since then I can get some nasty bucking if trying to launch hard. It gets worse when after spirited driving for a good session. It’s tamed a bit since installation, but still occasionally it gets obnoxious. I was thinking it was break in norms, but it it has not stopped yet.



Also, I did have a Whiteline trans mount bushing installed. And lately, an HKS supercharger which has shown me how soft the bushing package really is making the issue more prevalent.



Now, to the solution space. I’m not sure if this is the engine/trans mount set or the rear end suspension bits. Any comments appreciated as to where to start. Which might just be buying a GoPro to see the problem.



My car is stock suspension wise other than the Whiteline trans bushing. I’d prefer an STI parts solution, but not sure if they address the rear end bushings with different parts like the STI grade engine and trans mounts.

Originally Posted by jflogerzi (Post 3444628)

It's the Whiteline trans mount 100% I had the stage 2 sb clutch in prior to doing the mount and Perrin insert. Take offs are still smooth but I do get some low speed bucking in 1st gear. Never had that before. So guessing that's what your feeling. Clutch feels OEM and take off is the same for me

Sent from my GM1915 using Tapatalk

Originally Posted by jflogerzi (Post 3444628)

It's the Whiteline trans mount 100% I had the stage 2 sb clutch in prior to doing the mount and Perrin insert. Take offs are still smooth but I do get some low speed bucking in 1st gear. Never had that before. So guessing that's what your feeling. Clutch feels OEM and take off is the same for me

Sent from my GM1915 using Tapatalk

Originally Posted by jeepmor (Post 3446008)

I had my suspicions, I'll have to yank it and test again to be sure. I have slipped the clutch a bit figuring I was having a long break in as I'm pretty easy on clutches. But I never felt any shuddering that way, just first gear or reverse when trying to be brisk on take offs. The bushings on this car seem really soft, I'm considering some STI bits.

Originally Posted by jeepmor (Post 3558985)

I had the clutch opened back up recently, this root cause was the Verus fork with sloppy tolerances. The shop put in an OEM fork and all is well again, no more serious bucking.

Expensive mistake, but finally have this issue resolved. Also, the OEM throwout bearings still suck. At 30k, it's throwing rust dust out of it. Had the Exedy throwout bearing I saved from the Southbend clutch put in this time.