We have been importing direct from Japan OS Giken clutches for quite some time now since there is no US importer. We pretty much keep one on the shelf at all times (worst case 2-3 weeks), and its one of the single best street, 1/2 mile racing, multi-disc clutches on the planet in the R3C triple disc clutch with the required movement alteration kit.
OS R3C Main by suprastore, on Flickr
When selecting a clutch for a high powered Supra, there are quite a few options, but when you filter through the various parameters you end up with just a few that can do the job.
The OS Giken R3C triple disk clutch for the 1993-2002 Toyota Supra (V160/V161) equipped 6 speed cars and is a clutch that is proven to handle 1000HP, 850lb/ft of torque. This is a floating center hub design which minimizes the shock into the transmission, which is very important with a transmission as costly and rare to replace as the V160.
Drive-ability of the clutch in a MKIV Supra is good and while it has a firm pedal feel with a lower release point, it does not require a gorilla calve to operate. Most owners state that it typically has a grabby feel for the first 500 miles and then becomes slip-able after that (if need be). The pedal location in relationship to engagement of the clutch is closer to the floor than other clutches. Like most clutches of this nature it takes a bit of time to get used to slipping it, but it becomes second nature.
As with most all multi-disk clutches it does have some disk rattle at idle, which is reported to ease significantly over time, but it should be noted. We suggest setting idle around 1000rpm for noise reduction.
These clutches are great for 1/2 mile racers, ultra-fast street cars and are to have only 'light' drag strip use. As with any push style clutch you will need to order the pull/push adapter kit (movement alteration kit) along with the complete clutch, which we have included in this price.
Factory 6 speed flywheel bolts do not work with this clutch, so you'll need NA Supra flywheel bolts from Toyota or ARP (available from us).
When installing this clutch assembly, please note that it is mounted to the engine side, not the transmission as with many other clutches. One of the great things about this clutch vs the CM 850 Twin's (which we love if you have a Supra V160 pro installing) is that you aren't guessing on shims (washers) to get the fitment/release/performance right, as it installs straight out of the box perfect.
We've sold many R3C's recently to 800-1100HP owners and I have one in my personal car, so I can provide absolute relevant feedback. We have one kit in stock with the movement kit and the price is $2599 delivered in the lower 48 States. For other areas please email us at [email protected]
Pictures are of the actual clutch we provided to D. Tanner.This is a stunning masterpiece of engineering and design. Call us at 800.717.3050 or email to get this one.
OS R3C Side by suprastore, on Flickr
OS R3C Break Down by suprastore, on Flickr
OS R3C Explosion by suprastore, on Flickr
OS R3C Movement Kit by suprastore, on Flickr
Online Purchase Link: http://www.suprastore.com/osgirc3cltos.html Please note the pricing is slightly higher online, so simply make a note in the comments section of the order form and we will honor the $2599 price (clutch and movement kit, free ship lower 48).