I recently put an OS Giken twin plate clutch in my G and decided to upgrade the CSC while I was at it. I called them up and Jon was very helpful in deciding which configuration I needed to interface with the clutch. It was about 4pm in the afternoon and he still got it shipped out overnight and it was at my work the next day.

The install is very easy. It comes with new, SS clutch and bleeder lines and the unit over all is much larger and more robust than the stock plastic piece. The only modifcation that you need to do is grind down three metal tabs on the tranny cover plate inside the bellhousing. Took about 15 minutes with clean up.

Driving impressions:

1. I noticed the clutch pedal was a bit stiffer than with the stock CSC. My guess is that the bearing contact area where it presses on the hub spring fingers is larger in diameter than the sleeve that is provided with the Giken. This gives less mechanical advantage and makes it slightly stiffer. However, it is minimal.

2. The clutch pedal feel and travel is improved greatly. The engagement point is much, much higher and there is even tension all the way through the pedal stroke. With such a short, precise stroke, the stiffer pedal makes almost no difference. I am still learning the engagment and release points a little, but it is noticibly easier to drive than with the stock CSC.

I would say this is well worth the $400 or so dollars for this, especially if you are an agressive driver or have a higher clamping force aftermarket clutch as there are a number of stories of the stock ones quitting after only few thousand miles. There isn't alot of long term data on these replacements yet, so if it holds up for a few years I will be happy.

 

I'm assuming you replaced the clutch, drove on that for a bit, than went back and added the csc?

Having to grind the 3 metal tabs, is this a necessary modification or an apparent defect from the new CSC?

 

Yeah - replaced the clutch and drove around for a couple days with the stock CSC then dropped the tranny again and put in the metal one.

Grinding the three metal tabs is necessary as the base of the new CSC is larger in diameter than the stock one and needs to sit flat on the tranny cover plate.

 

Nice!

I'll be ordering one soon! How's your car running greggski. I bet you must be having fun up north.

 

Cars running great! Still kind of babying it while I break in the clutch. The only issue is a bit of Idle hunting but GTM is supposed to be sending me up a fix.

 

WOT it already haha!

i had the same issues too! it's annoying as hell, sometimes i'm just sitting at the red light and the car just stalls out lol. good thing Stillen just sent me a new tune that fixed everything.

hopefully Sam will fix yours soon! keep us informed how your car runs.

 

The idle hunting is intermittent and not a real issue (fluxuates between 550 and 750 for a couple seconds then evens out), but it can use improving.

 

I kept a keen eye on the AFR when I saw that hunt in idle. It corresponds to a spike in fuel being delivered. I suspect that this is totally normal to the car but is exaggerated when the turbo map is installed.

I understand that the factory ECM's tend to spike the fuel now and again to manage the ratio and confirm that the cat's are functioning properly. In my case it is impossible but the occasional "spike" happens anyway.

At this point I have written it off and typical of a modified car.

 

I noticed that to and thought that it could be leveled out via uprev. It's almost a non-issue, but with the $$ invested, I wanted it to be perfect. Thanks for the info though, good to know it's "normal" for the set-up.

 

Happens to me too. Doesnt bother me anymore.