Im ordering my trans rebuild, and when I asked Shep QM twin vs Exedy HD twin he said Exedy all the way because the QM is really a race clutch that is not designed for a daily driver that will see traffic and such. He said the one problem with the Exedys is the pressure plates are susceptible to overheating and they can warp. Im planning on being between 400-430wtq and 500-550whp in summer and going for low 11's or a high 10 at around 130+ on stock 2.0L and asked him if he has seen any cars having any problems going 10's with the HD and heres what he said

" I had problems running low 10’s with the HD but this was on a 2.3 with tall gearing. I am also very easy on driveline so I tend to abuse the clutch more while launching. The problem with us giving you a 100% answer is that I will be the first one you call if it slips haha. That puts me in a position to over clutch your car which I would rather not do.The QM is not just a “slightly *****y” clutch it is obnoxious along with all the other non sprung hubs. The sprung hub removes many of the harmful harmonics that the engine can transmit to the trans and driveline. The springs are not there just for a cushion while launching like many believe. Please do not get the impression that I do not like the Qm, I do like it but not for a true street car

I urge you to post a poll or search for what other people are getting away with and make sure you are comfortable with your decision.

Qm is working on a new set of discs but I have verified they will not be a sprung hub either L I would sell hundreds if they were a sprung hub."


Im almost 99% sure I will go with the Exedy HD as it is the clutch Ive been suggested toward 4 out of 5 times but I am still apprehensive about it. The street manners are there, the life is there as Ive heard they last and last and last, but when it comes to dealing with a launch Ive heard some stories that make me nervous.

As I told John, Id rather know I can put the power to the ground and deal with a slightly *****y clutch (to which he assured me Slightly *****y is an understatement) and I do not want to buy a clutch and have it slip or warp on me from a launch because it cant take it. And its not my driving Im worried about at all, it really is the clutch thats my concern. So if the Exedy will do the job for DD (which I know it will) and be perfectly fine for a few passes at the track, then Ill be getting the Exedy. I dont foresee me making more than 2-4 trips to the track in a year. Last year I went 3 times and got about 12 runs total.

So, as you see he suggested I ask around the forum for some advice from people who may have been in the same boat as I was at one point and experienced this clutch. My car is daily driver, it takes me to work and school, I drive about 3000 miles per month, my car makes 400whp/400wtq now and will, as I said, be in the low 11/ high 10s and upper 120's or 130s by summer time. Im not doing an ACT, or a Fidanza, or anything like that so those are out of the question.

 

You should be fine, I know FPRed cars making 560whp/550tq and trapping 134mph with an Exedy twin HD, they were daily driven too.

 

It'll do it no problem... For how long all depends on how often you launch it just like anything else =-)

Cheers!

 

I have had a PTT twin disc which is in essence a QM Twin disc or like saying a Dodge Neon a Plymouth Neon and Chrysler Neon if you know what I mean. I sold mine to a local person due to its anoying short travel clutch pedal on/off engagement. I also have had a Exedy Twin disc HD but never trapped in the 130's. The warpage typically comes from hop lapping and repetitive hard launches. I think there is no clutch excempt to preassure plate warpage.

Based on the two clutches I owned, I would stay with the Exedy for daily driving.

Carlos

 

I have had multiple Cars with Exedy twins starting to slip just at the 130 mph mark. In fact, Exedy themselves rate the clutch at I believe 450 whp for a Drag race application because of this.

Putting a twin in a car at that level is kinda equal to the stock clutch at the stock power level. It depends on how you drive it.

With that said, If you are interested in the triple let me know and I will see if I can help you out on price. I would feel much better about that then a twin. It will last longer, hold more power and still drive very smooth.


Let me know if I can help.
-Em

 

My twin lasted a couple passes over 130 mph.

Then it slipped once in 5th gear. I upgraded to a triple and all was well.

Exedy Triple cera-metallc is what I would recommend to you. In my experience, the triple is even easier/nicer to drive than the HD twin.

 

Thanks for the info guys, Emery Ill be in touch!! The twin can be converted to a triple, right? Just need to order the extra disc and one other part, right?

Any idea on how the triple lasts on a daily driver? Can they see 30,000+miles like the twins do before needing a rebuild?

 

I bought my twin hd with 8k on it, and it looked brand new, almost full clutch material on the disks too. Daily driving my Evo with Aprox 450-460whp it was perfect! No issues, until that is, I went to launch it. It would take the inital 1st gear launch without slipping, 2nd was good until about 7k (was shifting at 7600), 3rd gear it slipped a lil sooner. If I let it cool off for about 20-30 mins, it would not slip again until the next launch (meaning, I could go back DD'ing it without it slipping until I launched it from a stop again.)

 

I ran 11.2 with 18" street tires, Exedy HD with 30k, 100+ launches, MR 6 speed, 8700 RPM's at 123 MPH, 470WHP and 401WTQ @ 29 PSI, I have had zero slippage and still holding strong. I think the max TQ rating for the Exedy HD is 535 at the flywheel.

With a set slicks, a built five speed trans, and 32 PSI... I will be in the 10's at 5680' elevation!!! How about them apples?!?

 

I would advise against the Exedy twin. You can PM me for more info if you want.

 

You would need 3 discs and 2 plates. I don't have parts handy but I just went from the twin to triple when I had my car built at Buschur. So far, 9,000 miles on the clutch setup and no problems. Holds like a champ however havent been able to go to the track yet because of the weather.

I would suggest the triple for your power level also.

Good luck.

 

Exedy clutches are rated by torque not whp. The twin HD is rated for 450 lbs of torque at the wheel in a drag race condition. The same clutch is rated at 563 at the wheel in a road race condition.

I have many passes with my twin HD at the 130mph range and it hasn't slipped yet. One important thing to consider is if the clutch is not slipping you are putting more stress on your trans gears and input shaft. Which would be the case with a clutch that has a higher torque holding rating ove the twin HD.

I sell a lot of Exedy clutches and talk to them frequently as they are in MI in my backyard. There are pro's and con's to both the twin and triple.

When upgrading from the twin to the triple you should replace the 3 discs and the 2 intermediate plates. There is also a new optional "hub" to work with their new style discs for the triple.

Feel free to PM me if you have any questions!

Thank You,
Wayne

 

I made over 700 hp on my Exedy twin HD, made alot of passes. I can't remember how many. I think you should be ok.

 

It depends on how you launch the car. I made 540whp and trapped 130mph... The Exedy Twin is definitely at its limit. If you roll up and launch and don't attempt to spin the tires prior to running...it holds pretty well, but otherwise it won't.

I would recommend the QM twin so that you can SHIFT.

 

I have gone through two exedy triple cerametallic clutches now. They are good for a full season (130+ passes some of the seasons) and around 35K in mileage. I raced 05, 06 and 08 with 05 and 06 being where I put most of my runs in. Broke my driveline in 07 because of my first clutch going out on me (bad chatter). Got around 40K out of it though. Second clutch was more like 30K, but I reused my flywheel without regrinding it.

With only 12 runs a season, you could get several seasons out of it, depending on how much you daily drive it. I would probably say a few hundred passes if you don't daily drive it much or 35K if you don't race it too much.

I'm on my third one now with the new hub design and a brand new flywheel so we will see how long it lasts. I drive my car a lot less now (only once a week), so it will be interesting. Never tried any other clutch, but this clutch isn't too much worse than the stocker until it starts to chatter on you (gets old), then it's almost undriveable.