What is the difference in the twindisc clutch part numbers MM022SD and the twin disk clutch part number MM022HD??

 

The letter second from the last.
The HD has more clamp load. I don't know how much because I haven't tested them but my guess is probably about 10%.

 

No that is not accurate. "Clamping force" as I define it is how much force the pressure plate exerts on the disc usually measured in pounds. It doesn't matter how many surfaces, the load on each surface is the same. Having twice the number of surfaces recieving the load, you get twice the torque capacity if everything else remains the same. That doesn't necessarily mean that it grabs twice as harsh. The aggressiveness (new word) has more to do with the coefficient of friction from the friction material than it does the number of discs.

 

alright now the next question is launch...

ive launched it 5 times (ive been busy and the street isnt the smartest place for such things) the 1st launch was wicked i had to shift before the blood started circulating again. the 2nd 3rd n 4th times were all SNAFU i got a good few feet before the car felt i was using too much throttle...then the 5th time was ok...no foul ups just not very fast. were do y'all normally launch at (i have a rev limiter in place at about 5700 or so.) I slip too...(duh) but i 'blip' up to about 4500-5000 and as i release i give it more steady throttle.

 

I just installed my Exedy Twin HD and it's a blast to drive now. Very little more pedal effort than before. When if was first installed I had a lot of clutch play at full extension and the clutch grabbed very high but after 500 miles it feels and engages where the stocker did. I also replaced the clutch line and went back to BG so now my shifts are like butter.
I reved up to about 6500 on this clutch during break in but did not do any clutch drops.

 

Before as in over the stock clutch? I have an HD and I got into a stocker at a dealership....BIG difference. I think its still good considering the clamping force you get but I think its a real big difference over stock.

 

Thats not really what I meant. I mean if you were to let the clutch out slowly the same speed with both I feel like the twin grabs harder faster, the single feels like a more linear increase in grabbiness as you allow the clutch pedal to come back. I feel like as the twin comes back, it increases the clamping force faster for the same speed of the pedal.....is that making sense?

 

The pedal requires a little more effort but it's not that much more than stock...at least from what I can tell. But then again, I squat 650 so perhaps I just don't notice?

 

till this day my clutch pedal still drops down about a inch over night.... the next day I just take my foot and hook it back up. I bled the clutch a couple of times just like it says in evomoto.com and it still drops a bit.

 

Just take it easy for a few hundred miles and you'll be fine.

I'm not sure whats up with your car being hard to drive but I've driven another EVO with a ACT/light flywheel and I could hardly drive the car. The Exedy Twin is very easy to drive... I'll never have a single disc clutch again.

Also if you remove the restrictor pill (if you haven't already) it's even better

 

If you think driving an exedy is hard try driving my tilton :-)

 

I agree, I drove my buddies act 2600/light flywheel and it was much harder to drive than stock. It was by no means not drivable, just took a while to get used to....

 

The trick is to take time to break in. The smoother the mating surfaces (has to be worn other time) the less shaky/jerky it will feel down the road.
And with a new clutch, you should re-adjust the peddle after about a thousand miles or so. Engagement point varies and depends on the owner's preference. I like mine to grab just slightly after half way up from the floor while my local friend likes just an inch from the bottom.
FWIW; my Twin HD is about TWICE as heavy(peddle pressure) compared to the stock clutch.
As always it really takes practice to get used to the clutch and once you do you won't even think about it. I thought I was gonna hurt myself in traffic immediately after installing the new clutch.
The only time I came to appreciate a good after-market clutch is when I lined up to an unsuspecting _bigger_ car :}

 

I have had this setup in my 9 for about 2,000 miles i have tried adjusting clutch pedal several times, but seems that something is just not right.... I finally got how to drive from a stop but reverse is almost impossible all i end up doing is buring the clutch any help would be great, also i get this same buring while trying to take off in first making a sharp turn or u turn.

 

After break in does anybody's exedy twin disk squeal slightly right off idle, low speed, dead stop to say 3 mph? Just curious?