here is a quick email from OS Giken a while back.
If you have a chance, please check out the Feb. 09 issue of Grassroots Motorsports. An article concerning differentials is in there, comparing performance of the OS SuperLock, Kaaz, and the stock Torsen on an S2000. Needless to say, the SuperLock outperformed the competition and was the editors’ favorite of the 3.
Some highlights of the article:
“Essentially, the OS Giken provided the best of the two other differentials…”
“…he posted the fastest lap of the day when running the OS Giken…”
“Its very progressive lockup was just what our duo desired.”
Some things about the OS SuperLock that are not mentioned in the article:
– no break-in period required
– no need for rebuilds (with regular maintenance)
– as smooth as an open diff at low speed (no diff chatter), but still able to lock up to 100% under throttle
– no expense spared during manufacturing (raw-forged gears, heat-treated components, unique patented design)