i reach the 530 hp goal with my t-78 and my clutch is tarting to slip so want to know what are you running and lasting.

thanks

 

I haven't been dynoed at that power yet, but I am using the Exedy Twin Plate clutch and am hoping that it will hold up. I've been told that they hold up really well.

Dee E.

 

yes i think i will go with the EXEDY TWIN PLATE also i things is best option for price quality and includes a flywheel.

 

Those were my thoughts exactly.

 

get a ACT... even the single disk holds up just as well as exedy twin

and the clutch corresponds with torque... not horsepower........ so really on a 13B even with a T-78 your not gna get anything better than 400tq

 

I'm not making those power levels yet, but I'm running a Spec Stage 3 Clutch and Pressure plate. Its a six puck, sprung hub disk w/ a heavier pressure plate rated for 518lb-ft. I daily drive the car with no problem, clutch pedal is noticeably stiffer than stock, but not too bad and the engagement is pretty manageable.

 

i ran an Exedy Hyper Single for the last two years... 10,000 miles. it had a comfortable pedal pressure and, once you get used to driving it, almost vanished which is exactly what you want from a clutch.

as i added methanol and turned up the boost and started making more (haven't dynoed yet) than 500 rwhp the clutch wouldn't hold.

after alot of looking at my options... the carbonetic, spec, act, tilton i am going w the exedy twin cerametallic. it is reasonably priced and will hold 650 rwhp. pedal pressure is the same as the single as the additional frictional area from the second disc makes the higher clamping pressure, not more springs.

i looked at carbon closely and don't like the variable coefficient of friction (from .31 to .48 based on how hot the disc is). exedy's cerametallic is always .49. it might be ok for 500 hp but need lots of heat to hold 600. i do not want to buy more than one clutch in 07.

i. BTW, am skeptical a some of the clutch companies estimates of what torque their clutches can hold. if it sounds too good to be true it isn't.

good luck,

howard coleman

 

I am using an ACT 6 puck unsprung with a ACT heavy duty Pressure plate. Also I have the pro-lite flywheel.

 

I had the ACT 6 Puck withought the heavy duty pressure plate. I put down 603 whp and 500 torque.

I was also pulling 1.4 60 foots at the track. It holds just fine. It was 4 years old.

 

That's odd, I'm running the same clutch and the pedal has a pretty easy feel to it, much less stiff than my old ACT street HD-00 setup. Do you also get a slight whining when engaging the clutch and moving from a stop? Makes the car sound supercharged, and I've had other other guys with the same clutch tell me they've experienced the same noise.

 

What about an FC push-style clutch? Are there any single plate clutches that will hold 400-450 lbft?

 

spec stage 3 from rx7store- I love it- wayyyyy better the my old act solid puck.

 

im useing the spec stage 3 + it should be good for about 600ftlb its very drivable almost like a standed clutch.

 

Same clutch setup here, I'm not making over 500 yet, but i plan to in Feb. I'm expecting it to hold just fine.

 

I am a little under 500 , but I love my ACT 6 puck , with a ACT heavy duty pp. I have the RB flywheel also.

 

I was told all you need is a 6 puck, the stock pressure plate will work fine.

from the other posts, that looks right

 

I run ACT Xtreme Pressure plate, 6 puck unsprung disc and SR motorsports 9.5 lbs flywheel, engagement takes getting use to from a stop, but nothing out of control and is fine for me. I was thinking about putting in a sprung hub for easier drivability and less shock on the drivetrain, but dont want to risk the springs coming apart or breaking and jamming up on the pressure plate, etc...This setup is the most economical for holding that kind of power...ernieT made 643 whp and 520 lb ft of torque and it held fine, in fact, his clutch is in my car, and I have no issues of slipping...561whp/445 lb ft torque....the stock pressure plate will not be sufficient in holding this kind of power, unless you use something like a Sintered iron disc which will destroy your flywheel right quick, its brutal, but thats why it can hold the power, esp when it heats up.

 

I notice the whining occasionally, more often than not when using reverse, trying to slip the clutch a bit. I should have been more specific on the pedal feel, as its still very light, but noticeably stiffer than a friend's stock setup. That said, his wife's Mazdaspeed6 clutch is more difficult than my Spec. I'm also running a lightweight flywheel, I had a Tri-point Aluminum flywheel (7lbs or so IIRC) for years and swapped it out for an ACT Streetlite (9.5lbs maybe) when I put in the Spec.

 

According to every clutch company I've talked to, including Carbonetic, ACT, and Exedy, sprung hubs do not have any impact on drivetrain shock or engagement. What they do is reduce pedal vibration and noise during clutch engagement and engine braking. In the words of the tech at Exedy USA, it's mainly for doctors that think they are racers, but don't want something that feels or sounds different than their stock BMW.

Exedy recommended a triple plate unsprung cerametallic setup for 500lbft + of torque. They listed Marcus at Magnus Motorsports as a reference. I spoke to him about it and he said it is surprisingly streetable and he was very happy with it.

 

So why didn't you go with that choice Christoff, thinking of making more than 500 foot pounds of torque?

 

ACT 6 puck, ACT HD PP. Very streetable IMO.

 

^^^^ +1

ACT all the way, hell Jrat is making 500rwhp with the full face disk!!!! no slipping! gotta love act

 

re Exedy-

the sprung exedy twin cerametallic PN ZM022SD is rated by exedy to hold 705 ft pounds of torque for road racing and 610 ft pounds of torque for drag racing. that's at the flywheel so the rear wheel torque figures would be: 600 and 518. that's in print from exedy.

clamp load is only 2205 V 2655 for the hyper single that holds 361 for road racing and 340 for drag racing at the rear wheels.

so less pedal pressure and much more capacity w the twin cerametallic.

the carbon has less capacity while having approx 10% clamp force. stiiffer pedal, less grip... and that assumes it is at full heat. carbon's coefficient of friction varies between .31 and .48 depending on heat. cerametallic is .49 at any temp.

if you are more than 600 ft pounds of rear wheel torque road racing or 518 drag racing you need the triple according to Kevin Fujioka who is exedy's number one tech guy in the usa.

and yes, according to Kevin (and ACT), sprung hubs have no effect as to lessening driveline shock.

howard coleman

 

I'm glad I have the Exedy twin disc. I Love it!!!

 

I had the ACT xtrem pressure plate and 6 puck disc and I hated it. Its had no smooth transition it was either go or neutral. I now have the extem pressure plate and a street organic disc and it is very nice for me since I only drive my car on the street. There was no change in pedal pressure from the two and just slightly stiffer than stock.