Now! That's I always do. My problem is the gear won't go in at high RPMs with ACT clutch (2 of them already) but I was doing fined with the stock one. I'm putting the Exedy twin (should be done by weekend) and will see if it's the problem. I'll keep you guys updated.

 

then y do some places offer the hyper twin, and the twin carbon where the hyper twin is the cerametallic. and other places just label the cerametallic as the twin.

 

maybee they have not looked at the Exedy site to see what the actual product names are , Im not sure really.

What "places" are you referring to.

 

Hi Jon,

Since you see all of the busted transmissions when they come in, and you spend a lot of time with owners diagnosing problems, can you compare and contrast these clutches - that is if you feel comfortable. You must have a good idea of the functionality and the application of each clutch.

I know you walk a fine line not wanting to **** off the manufacturers, and I hold them all in high regard, but the Evo public could sure benefit from your opinion.

Twin plates - Exedy ceramic/Exedy carbon, ATS carbon, RPS carbon

Single - ACT, RRE no name, RPS

Triples - ATS, Exedy

In my general recollection, these seem to be the most popular.

And John Shephard, please feel free to chime in. I think the 2 of you could add the most to this thread. (BTW, love those race vids!)

Thanks

 

well gruppe s lists it as the twin, and vivid has the hyper twin and the carbon twin

 

Ok... by the books... it's actually the "Hyper Multi Plate". The Hyper Multi Plate comes in a Twin and a Triple disc. So the name "Hyper Twin" or "Hyper Triple" just became a common street name.

As for the carbon dics... they are the "Hyper Carbon Series", and are offered in single, twin and triple. Thus earning the names "Carbon Single", "Carbon Twin", etc...

I think the reason people statred throwing "Hyper Metallic Twin" or something to that extent was to absolutly clarify carbon vs metallic discs.


Our "Hyper Twin Metallic" is our most popular piece for the Evo. However, if you wanted to compare "apples to apples" our Stage 1 Organic (05803) really goes head to head with the ACT "HDSS".

For R&D I actually removed my twin disc and installed this Stage 1 Organic and it is holding 12.2 second power. Hard launhes (5800-6000RPM), agressive shifting and all around abuse... and it hits the street for under $500. It's a very overlooked clutch, but could be the best "bang for the buck" out there.

Anyhow, hope this cleared up more than is confussed.

 

sweet info matt,
sounds like a solid report for the S1 organic


dru

 

I have the ACT, and I'm very happy with how it feels for everyday use.

 

We have tested both the Exedy pressure plate and the Exedy friction material. The Exedy stage 1 is a great clutch, but it doesn't compare to the ACT as close as you suggest. The RRE "no name clutch" uses your stage 1 pressure plate and is more comparable to the Exedy stage 1. The ACT still has some performance advantages while giving up a little more on driveability and heavier pedal than the Exedy or RRE.

 

I've been running my new Exedy twin disc clutch for a week or so, and I'm very happy with it. First off - there is definite noise associated with it when the clutch pedal is depressed. I'm assuming the twin discs are making the noise. The noise occurs at start up, but is very noticeable in between gears when accelerating with any type of urgency and then upshifting. I love it - add it in to the differential whine and you really start to get the sensation that you're in a WRC car. (The new Borla cat-back I threw on when they did the clutch certainly helps, too!) The Daikin web site prominently warns you that a twin disc has this inherent noise associated with it and that it is not indicative of a problem.

I'm still getting used to the new engagement point of the clutch pedal. Engagement is much quicker than the stock clutch, but can be modulated slightly. Since I'm within the 600 mile break-in period, I'm trying to be as gentle as possible with it, but trying to be gentle sometimes ends up slipping it more than you'd normally be comfortable with. This thing best works with a quick in and out once you're moving (quicker than the stock liked). Absolutely streetable, though. Clutch pedal effort is same as stock. Only downside I've noticed so far is sometimes it requires a bit of effort to get the shifter into 1st gear, but that may very well be due to the installation process rather than the clutch itself, since I'm pretty sure the clutch really isn't involved when selecting 1st gear (other than needing to be disengaged).

 

Thank you!

 

Here's an update on my Exedy twin disc experience, and it's not good.

At around the 800 mile mark, I started to have problems:

1. Disengaging the clutch doesn't seem to really disengage the clutch consistently - I have to pop the shifter out of gear and into neutral before the car will coast - otherwise it will slightly engine brake. (clutch drag?)
2. A new sound cropped up - a rather loud harmonic, like someone ringing a tuning fork, would occur as the clutch was being engaged. I can live with that if the clutch worked right.
3. I'm also experiencing on occasion the clutch engaging lower in the clutch pedal travel than normal, then it slips, then it engages again once the pedal reaches the regular engagement point in its travel. This usually happens when a)starting from a standstill and b) having the wheel turned.

All these symptoms become more common as the car warms up.

Oddly enough, the hard effort it took to put the car into 1st gear has gone away.

The real kicker here is my Mitsubishi dealer, Otto Mitsubishi out of Clifton Park, NY, has been no help at all in troubleshooting the issue despite them being the ones who installed it. Lesson learned - make sure you have an experienced installer for a clutch that's not stock. Otto acknowledges there is something going on, but they shrug their shoulders and say that since it's aftermarket then they have no knowledge of what to do to address it. Of course they were positive they could do the install when I approached them before scheduling it. I don't know for sure whether it's the clutch or the install that's the issue, but I'm guessing it's the installation.

I've emailed Exedy and have gotten a quick response (7/13) from them saying they were going to forward my symptoms description to an engineer to see if they could guess the cause and recommend ways to address it. In the meantime I've made an appointment on 7/25 with Turbotrix in Edison, NJ to take a look at it and see if they can diagnose and correct whatever is going on. They're a 3 hour drive from me, but such is the price for living in the boonies of upstate NY. It p*sses me off that I've paid over $600 to have the Exedy installed and will have to pay a few more $100s to have it diagnosed and hopefully fixed.

The car is a b*tch to drive now; you never know how the tranny is going to react to a shifting action. It'll freeze me out on occasion when attempting to down shift, it'll catch quick one time and then catch slow the next. The shifting is so unpredictable now, in fact, that I started looking at possible new rides - I can't afford to have a vehicle that no one in the area knows how to work on, and the nearest expert is 3 hours away. The Evo just ain't fun without being able to shift it.

When I find out more I'll post it.

 

Sounds like you warped your clutch. This could be because the discs were mixed up and out of balance when installed which I've heard happens on occasion.

The harmonic sound should be normal if it is on roll out or downshift; it is an unsprung twin disk.

Once the clutch is broken in the pedal will move lower.

PM Matt Gold, our faithful Exedy rep. He will best be able to help you.

Also, MAKE SURE YOUR TRANSMISSION OIL AND TRANSFER CASE OILS ARE OEM SPEC. THEY ARE DIFFERENT OILS. See your owners manual or do a thread search. If your installer mixed up the disc order and put the wrong oils in, you'll be looking at a brand new drive line. I mention this because there is a harmonic sound that comes from the transfer case when it goes fubar and you are experiencing transmission issues.

Good luck!

 

If the dealer screwed this up then it'll be VERY interesting when I confront them with that.

Since the dealer did the install, they used the Mits fluids when putting it back together, so I should be good there.

After emailing Exedy I rec'd a response from Matt G, so I'm checked out on that part. I'll find out more on 7/25.

 

I just had my exedy twin installed by my dealer as well. Im hearing some strange sounds so far and the pedal grabs very high up but I'm still breaking it in so I'm not going to adjust it yet.


I can't understand how the tech could have installed the clutch wrong unless he put the disks in backwards. I took my setup apart and it was pretty straight forward and i've only ever done single disks before... time will tell if this holds up or not. If not I will be pissed because it cost a pretty good coin and was susposed to last a very long time under normal use.