Well this is the icing on the cake for me. I'm definitely not taking the chance to rebuild my triple. Any answers to y this happens? Why did exedy change to this new hub design from the old setup on the triples?

 

Hey I'm guessing you got the street/strip version? How bad/hard was installation?

 

^ This! You want Easy driveablity get the street version. Weekend warrior track monster get the race. Be done with stripped hubs/popped tobs.

 

oh snap, I must have mis-read the thread. I thought the old design was the one failing in here, and the new design was better.

Do I have it backwards, and it's the newer ones failing? If so, I'll have to keep an eye on mine though it seems fine for now...

 

Exedy changed the design to lower the cost of rebuild. This way they can make a common disc and not only an EVO specific one. This issue has been seen in other gear driven clutches as well so the quartermaster is not the end all to this design and has seen similar hub and spline failures.

 

I got the the race version, I only only plan on going up in power so I wanted the 900 Ft/lb Tq rating over the 600 that im already barking up. and as far and the intall went it was super easy, not complex at all, putting the clutch itself on was easy, putting the hydraulic bearing on was super easy, shimming and doing the clearance was kind of a pain in the *** because the math kept coming out funny and then I realized the equation in the directions was still written backwards but... once all that was done it was simple, nothing overly complex, and bleeding the bearing was way easy

 

haha yea, screw all that nonsense so over it all too, but to be honest, the race version drives really well too, its not as aggressive as people make it out to be. I havent really noticed or been phased by anything this clutch has done.. and in all honestly as soon as I drove it i was putting way too much effort into everything, like everything is just lighter and easier compared to the triple, Its like butter, all over it lol

 

The new QM design is way better though on the hub design
1) the gear is WAY bigger

2) A LOT more and smaller teeth on the hub giving it a tighter fit and more surface area the disperse the load

3) the hub is attached to the disk closest to the motor and only the other disk moves freely around. This makes the entire overall design was stronger and less moving parts. and yes everything is going to fail and nothing is the end all be design esp with there are so many factors at play, but the overall design is a significant improvement over the Exedy

 

Any definite answers as to why this happens?

 

wondering why a exedy rep has not came on the fourms and posted there thoughts they were very helpful over the phone last time i had to deal with them i will be pulling my tranny this week with a update.

 

I would suggest a Rockwell hardness test on the input shaft and the hub.

 

ok so my shop thats helping me with warranty called exedy and they said it was due to the clutch pedal adjustment...

they said if you have too much travel in the pedal itll allow too much room for the disks to move around and cause the issues

but i dont really buy that because the hub is only messed up in a small area of where the disk would be .. and how does an in out motion effect the disk when pressure is put on the hub .. i think the metal is just too soft on the hub and isnt standing up properly

 

my triple HD has been fine.

 

Here is what i was told when I had this issue with my clutch after only 5500 miles.

That issue show is caused by a mis-alignment issue. This could be loose or missing bellhousing bolts, a bad input shaft bearing, loose or improperly torqued pressure plate bolts, over adjusted hydraulic system.

Sincerely, Evan Cline
Technical Coordinator-Aftermarket
www.exedyusa.com
800-346-6091 ex633
734-397-6633 direct




All of them issues were not the case. Trans was fresh with about 7k on it, no loose bolts, nothing improperly torqued and nothing over adjusted. No matter what the real cause is it will never be on their end.......

 

The problem is caused by not having a pilot bearing which will allow more play in the input shaft. I spoke with exedy on the phone today and it sounds like they're working on a fix. I'm not sure if this is true but I sure hope so. It seem like the metal is just too soft and rolling over very easy or i could see the misalignment being a issue even if it's out the smallest amount it would cause excess vibration and wear the huds likes its doing. I really have no idea just hope they get it worked out in the end!