Same clutch maybe, NOT the same pedal/master cylinder. This one has no adjustment at all. Also appears to be a longer stroke....But you wouldn't know that, you don't own an X.

Alot of Evo owners will/do disagree with you as far as the CDV removal causing issues. Plenty of reported high mileage cars with the CDV removed.

 

you mean to say they put a lancer GTS clutch in your evo X? then it is true... the evo X has evolved back to its roots.... the lancer GTS!

 

Stock Clutch FTL also, but im still 25K miles on a stock clutch in my 9...

 

Both clutches test about 2200lbs and are almost identical. That calculates to a torque capacity of about 373 ftlbs at the flywheel as it is slipping which should be enough. On the other hand, if the clutch gets hot, the coefficient of friction goes down considerably therefore the torque capacity goes down. The result is clutch slippage and damaged parts.

 

373ftlbs. Some of us with boost controllers/filters/ic pipes/ catback would surely over-power the clutch. Wow!

 

Keep in mind, this torque capacity is calculated as dynamic friction, and not breakaway torque which would be much higher. In other words if you are under full boost making over 373 and trying to get the clutch to hook up, forget it. On the other hand if you have the clutch fully engaged before hitting full boost, then the torque capacity of the clutch is much higher. This is much like tires and how they stop better as long as you don't allow them to break loose.

 

This makes complete sense but does beg the question about your rated torque capacity on your products. How are they rated? Are they rated so that once that tq is reached even with the clutch engaged, they would slip at the listed rating?

I appreciate you time Dirk. Thanks!

 

As I mentioned, they are rated using a dynamic coefficient of friction. In other words, as the clutch is slipping. It is a pretty standard formula which is multiplying 4 factors together;
R - radius of gyration (mean radius of the disc) in ft. In this case .38 ft
P - clamp load in pounds (2240 lbs peak to be exact)
N - number of surfaces (in this case 2)
F - coefficient of friction (organic is about .25).

Let's do the math together:
R x P x N x F = T (Torque capacity)
.32 x 2240 x 2 x .25 = 358.4 ftlbs

OK I was off a bit when I guessed earlier because I was working it backwards and I didn't know the exact ratios from our clutch to the stock one.

Of course this is great on the drawing board or in the classroom, but there are many variables that are not as easy to calculate. The constants for P and F are really variables if you look at it in perspective since both friction and clamp load changes with wear and heat. But constants are easier to calculate.

 

..........

The MC and pedal assembly is the perfect example. Yes they are absolutely different than the Evo IX. The X's M/C and attachment rod is plastic with absolutely no adjustment. So in the IX you could adjust the pedal free play to obtain your preferencial engagement point. You can not in the X.

 

Dirk, isn't that example wrong? Did you mean .38x2240x2x.25 = 425.6 ?

 

The stock evo clutches have ALWAYS sucked for launching. AWD + stiff clutch + joe street hero + launching = broken expensive driveline parts. i knew back in 04 before i bought my VIII that the clutches are definitely weak, and probably that way by design. a clutch job isn't that bad. you could throw in an ACT clutch TODAY and be set for quite a while. and yeah rally cars launch. they also have multi-plate race clutches, a support team, and have their clutches replaced all the time. the stock clutch and a warranty isn't a substitute for any of that. you gotta pay to play...
EDIT: If a cop here ever saw you on the rev limiter launching from a stop light trying to beat another car, he would give you a speed racing ticket and impound you car...

 

Wrong? How dare you! (sarcasm intended). I looked again and... Of course it is wrong... darn it (but .38 is incorrect too). Below is the math in detail.
(240mm OD + 150mm ID) / 2 = 195mm (mean diameter)
195mm / 2 = 97.5mm (mean radius in mm)
97.5 / 25.4 (conversion factor) = 3.83 (inches) / 12 = .319 (radius in ft)

Yeah I realize there are easier ways, but I try to stick with conversions and dimensions I remember. Of course that ended up being the error... my memory!
The math is fine. The problem is the ID I used is wrong. What can I say since I was at home at the time.

I realized after seeing you post this morning that the ID is 160, not 150mm. OK so if we run the math again we get a radius of gyration of .328 (round it up to .33). From that, you get 370 ftlbs for the stock clutch (approximately). Now that makes more sense. How did you arrive at .38?

Clutch lesson for the day: You will see from this example that a disc with a the same OD friction lining but a larger inside diameter will calculate to have a higher torque capacity even though it has less surface area, because it has a larger mean radius. by using a really narrow lining, you can increase the torque capacity quite a bit. But are you really getting more torque capacity? At times you will but with less material doing the work, it will of course wear faster and heat up faster. An overheated friction material will have a lower coefficient of friction and therefore a lower torque capacity. My pleasure to share some tech with my EVO friends!

 

Amazing amount of info here. Thanks Dirk.

I got .38 from your previous post yesterday at 8:47pm .. in it you stated "in this case .38"

I like 426 better though

 

Play nice, please Evo kid and TSi

 

Its cool noize.

I just believe that the stock clutch isnt as bad as people make it out.

Like i said, I launched both of my bolt on evos a bunch of times, one with the restrictor, one without. I launched them both a lot of times (40+) and both clutches were fine at around 40K miles. If someone can launch a certain car with a certain clutch a bunch of times and have nothing happen, then someone come and cant launch the same car, its not the cars fault or the clutches fault, its the drivers.

The reason this stuff makes me so pissed, is that rumors get started then i go on other forums and have to deal with kids saying the EVO clutch sucks and i have to correct them, etc.