Present one is a 3600 pound single plate Jim Berry special pictured below. Looking at some incar sprint circuit videos it seems like it may have been slipping a bit but not enough to be obvious. It's quite decent to drive around town with the cushioned center so I don't want to lose that quality even though the Z is basically a track car. Any proven recommendations?
Anyone used a high end JWT or Southbend clutch listed here? http://www.conceptzperformance.com/...train&CA=34&UID=20110701162221121.210.234.154
I'd just talk to Jim and get what he reckons. I heard that NPC can make a twin plate from your existing flywheel if that's your thing...
I think by memory the 3600lb pressure plate is the "Full Monty" you want the "Super Monty". Southbend are definitely good though, SATAN successfully ran a low 10 with one of their custom clutches without slipping and will likely be just fine for when he reaches the 9s. You'd be better off talking to Dave@SBC (Z31P username) rather than buying some off the shelf generic clutch though imo.
OS.Giken twin plate? Under 2K fom the US, they have sprung center plates which are a must. I sort of have the impression that ~500whp is about the limit for a single plate, JB is pretty good but like anyone will always try to flog their own gear.
500rwhp is pretty low, I do not see a 4400lb rated pressure plate and 6 puck carbotic clutch being any problem at 500rwhp. Maybe at 1000rwhp and 800ft/lbs tq you might... If in doubt, troll some of the Skyline forums as they've used them all.
Theres a member on SAU who owns the Silver R32 GTR "twoogle", it ran 100+ 9/10 second passes on a Jim berry clutch at 470awkw iirc.
I've got a nismo twin plate and liked it 100x better than a single button clutch. Pedal is just too hard on teh single plate, twin plate feels like stock and good to 800rwhp (quoted by the guy that rebuilt the clutch). Take up is unforgiving but you get used to it. If it's a track car why do you care?
I would see what what jim says, hes pretty good at what he does. I got a jb clutch told him what I wanted and made a perfect clutch.
You can see by the pic that the plate has a fair bit of surface area, I'm fairly sure that the larger the surface area the less effective clamping pressure becomes and so slip is more likely. The OS.Giken twin plate clutches have sprung centers, am trying to find out what the capacity is for the Z32 version.
Friction is independent of surface area. Technically less pressure, but the same force regardless of area. Friction is the friction coefficient times the force.
