Clutch / Flywheel for agressive driving and TT?

elperuano

Would be good choice. Lot of tt guys here runnin the os giken

phunk

I will give a semi detailed review of the combo I went with. I am running the OSGiken Twin with the ZSpeed CSC, and recently added the RJM pedal.

OSGiken: Pedal pressure is great (as in, not too stiff). Holding power is great (im nearly 600 wheel with no slip yet and have tons of miles on the clutch). I am hoping to see it last another couple years before rebuilding it or upgrading it to a triple. Engagement window: an absolute friggin nightmare for DD (which I use the car for), but perfect for racing and power shifting. Basically, once you push the pedal in, the moment you feel any pressure resistance after the slack, thats it.. the clutch is disengaged enough to shift. So for racing you have immediate clutch release which means less grinding and missing gears. The light weight hub and disks greatly aid powershifting. With my stock clutch, it didnt like to powershift and would often grind. Now I have none of that business, I can row through every shift at full throttle and I get no grinding... an occasional scratch if I screw up my timing. Daily driving it takes a ton of getting used to.. it will slip, you just have to really fine tune your foot technique to use the real small window.

ZSpeed CSC: Cant say much... and thats a good thing. It has been doing its job for a couple years now without a hiccup. Bleeding it was a huge hassle... but I am not sure that's really the CSCs fault. The master cylinder moves so little fluid that it just takes a lot of time. The fitting arrangement makes me feel that it seems logical to jack up only the driver side of the car, to make it easier for air to escape the CSC and get on the bleeder side of the T fitting. It took so long to bleed my clutch, I am not sure if this made a difference or not. Not helping was the fact that I had an interesting sludge that took forever to bleed out. I have no idea if this sludge was a reaction between the stock fluid and the Motul RBF600 I changed to at that time, or some type of grease or something that was inside the CSC when it was manufactured (before it would have made it to ZSpeeds hands, so I wouldnt fault them if it were the case). But I do know that 2 years later I still get some sludge floating to the top of clutch fluid. But after my initial struggles with bleeding and sludge, it has been a great reliable and functional product.

RJM Pedal: Impressive kit. Even more impressive when you consider the price... when you pull it all out and look at it, its surprising to get so much for the money. It does exactly what its supposed to do. I havent even played around with the setting much and its already made the clutch much easier to drive on for DD. Installation appears over complicated and made me hesitate for weeks to dive into it, but is actually really quite simple once you "get it". if I could go back in time, I would have installed this pedal right away after getting my clutch system bled and functioning properly. To have installed it before my bleeding woes, would have had me suspect of all kinds of things, so if I were to do the same installation for someone else, I would get the clutch system fully bled before installing the pedal.

__________________

elperuano

Description of OS Giken is spot on.