Might as well just get an ACT HDSS then, basically the same torque capacity and half the price.

 

The organic won't hold up to launching for very long. Other than that it's a great clutch.

 

Is it possible to run the organic discs with the HD pressure plate in the Exedy twin? Only difference I can tell in the specs is Disc Diameter of HD = 200mm and SDF = 215mm. The two assemblies look different so Im guessing probably not likely to be compatible.

I have an MM022HD I'm going to try next season (going in the car as I put it back together) but have previously had great luck with XTSS that I typically would replace every 2 years. They always have life left when I pulled it but I cant have the car down half way thru the year or a clutch fail at a national event.

 

True on paper but the two have different driving characteristics. The exedy has a lighter pedal and smoother engagement. The ACT also has what feels like a more grabby engagement and IMO is not as gentle on the drivetrain (my subjective experience).

 

The clutch doesn't save the drivetrain. The driver does.

 

You've driven the Exedy twin disc organic?

 

Any word on the ACT twin for the 8/9? Not doing the HDSS or XTSS again. My #1 priority is no-high-rpm-lockout, followed by longevity. Don't really care how it drives, all I want it to do is shift. I do 2hrs in gridlock traffic every day, the car is never going to drive nice anyway.

My clutch is adjusted so high right now (even the 14mm nut at the stopper/sensor a few turns) that it's hard to left foot brake.

 

Oh I don't think I followed the train of responses well. I thought you were comparing to exedy's single. I haven't tried the twin organic. But I would expect the twin would still shift faster than the HDSS, even if the rest was equal.

 

no the pressure plates are for different thickness of the cerametallic or organic plates.
I planned, one organic one cera plate. But all parts didnt fit by cross changing.

mm022sd/hd flywheel have also a smaller inner diameter and the organic plate didnt fit

 

Not sure if this was a good or bad idea but wanting to switch from ACT HDSS I made the unpopular choice of getting a OS Giken TR Twin with mechanical push conversion and will be using it with TRE trans and tcase, if I can ever get ahold of Jon. Sure the mechanical lever push conversion looks a bit primitive, maybe it weights a little more maybe it doesn't, but I don't really care that much as long as it does what it's supposed to well, reliably. Whole thing was $2,200 with a machined metal alignment tool. More than QM8, MUCH less than Exedy Twin with AMS push conversion, and I have always liked OSG parts on my other cars. I'll follow up with review, but it will be awhile since my engine's not even here until Weds and I am swapping into a new chassis.

 

Yes and no. I've had an exedy twin hd, then an exedy triple with hd pp, then an osg twin with push conversion, and the new setup going in with the motor rebuild is back to the exedy twin hd. I ran the original twin for years and had good luck with the drivetrain. As I made more power, the Pro Solo launches started killing it. I decided to convert to the triple to handle the abuse. After a few seasons of nothing but drivetrain issues, I finally realized my error. The triple does not slip when hot. As much as I would like to think I could get it to slip on launches, it just was too fast of an engagement.

Mid 2017 season I swapped to an OSG twin disk with push conversion. Immediately I noticed the difference in launch feel. I even had people at Pro Solos comment on it and show me slow motion video from their phones. I have not broken anything from the transmission down since the change, but I had other issues. Ultimately my motor was taken out after two events last year. The flywheel came loose, the vibration took out the timing system, the rest was a valve and piston fight that nobody won. I'm convinced it was a flywheel fitment issue (separate story... not my first flywheel install by far), and I was not comfortable staying with the OSG unit. As a result, now back to the tried and true Exedy twin hd. I figure if I have to rebuild it once a year (or more), it is still cheaper than most drivetrain parts.

 

Did you try a magnus launch control device?

The flywheel faking off sucks. It ruins everything. I had to do a motor for a local here because of that. He was... displeased with the previous shop.

 

After 100mi of driving the Exedy twin I can see how its liked so much. Plenty of slip range on the engagement but not a soft weak feeling, makes almost no noise with clutch in, no noise with clutch out, and so far seems to shift great.

I cant speak to pressures cause my feel is skewed driving XTSS for years. I get in like a BRZ and feel like I dont even push on the clutch and it falls to the floor. But it doesn't feel excessive and the wife things is pretty easy too (Caveat, the wife is probably fast enough to trophy in open at Nats.)

 

my exedy twin seems to get worse with engagement over time - i've had to polish the tower/arms once, i may have to do it again, it just fights me sometimes getting into 1st and reverse. no issues shifting in performance situations though.

 

Not going into 1 or R at a stop is usually the trans not being lined. Put it in 4, then go to 1 or R. That always does the trick in my car.