Power goal is approximately 450 to 500whp on a 2.4L build, 94 octane. E85 dyno run once or twice might push to freak numbers, but it won't at all be reflective of how the car is going to actually perform the majority of its life.

I understand running a twin disc clutch is going to decrease the overall lifespan of the drivetrain, but for my power goal, is a twin disc basically necessary? How significant will the wear and tear be to the drivetrain by using a twin disc?

Just wondering what the options are that equate to an overall reliable, yet practical configuration...

 

ACT six puck single disk here but stock displacement.

 

I have an exedy twin on 400 awhp. Wasn't too sure what all the hype was bout until I put the clutch in, and I can honestly say the drivability is amazing. For the amount of torque the clutch is rated for it is really a dream to drive, and the felt pressure on the pedal is barely more than stock. A lot of people have an issue with the noise of the clutch over stock, but I don't know if my clutch is special or what but there is no more noise over stock, my rear diff makes more noise with that solid bushings than my clutch does. I plan to swap out the stock turbo for an ef3 this sumer and I have no worries about the clutch handling the power which should be in the range you're asking about.

 

My Exedy twin HD is the third aftermarket clutch in my car. Honestly, I can't tell the difference between it and my single disk clutches, from the driver's seat. It is just as easy to drive and doesn't rattle at all. (it did a bit when it was new though)

So, why do you think the twin disk will decrease the lifespan of your drivetrain? When you mention wear and tear, are you worried about the heavier pressure plate?

My thought is: I drive my car with the twin exactly how I drove it with a single. So, the wear and tear will be about the same. To my knowledge, the heavy duty pressure plate does not, in itself, cause premature wear of drivetrain parts.

 

I put a exedy twin in my Evo IX with only 350whp/300tq. I put almost 20k on the clutch and ended up with over 500whp/400tq and never had any issues. The good thing about the clutch is that it works just as well on low hp levels as it does on high hp levels and it gives you room to grow.

 

I couldn't tell you, but Jon Ripple @ T.R.E. who I spoke with last week, said generally (not commenting specifically on the MM022HD) with a twin disc clutch versus a single, expect the transmission to last about 60-70% as long. We didn't address the subject in detail as there were much more pressing items to discuss, so I don't really know what it is that would contribute to it lessening the lifespan of the transmission.

 

Didn't realize you were doing such an involved swap on such a crap base model. The chasis is a flexy turd. Save yourself time/dissappointment and go drive a proper ct9a before you even turn a wrench thinking your swap will come out anything close.

 

i'll have a chrome-oly roll cage and lots of frame supports in addition to a solid rear whiteline sway bar, front evo sway bar, upgraded control arms and a nice set of coilovers (Tein Basics). I also don't believe without any of this it's as terrible as you say....

this was taken a few months ago; the 2x2 steel bar and tubing sits above the Outlander crossmember which is welded (not bolted) directly to the H rails of the car. Add a roll cage that goes through the firewall, it's not going to be a bendy turd at all. I reckon it'd have superior rigidity to that of a stock CT9A...

 

I was talking to an evo mechanic last weekend while he was removing my ayc pump and we got on the topic of clutches, and he said that a strong clutch like the exedy twin will cause the drivetrain to take more of a beating because basically it does it's job better than a single plate, meaning it grabs hold properly and transfers all of the power like it should, where on a spring loaded single plate it's the clutch that gets more of a beating. I have no idea how true that is but it made sense

 

Makes sense; all Jon basically told me was if a transmission he rebuilds which is treated well is capable of lasting for 100,000 miles, expect it to last about 50k-70,000 miles with a twin disc clutch.

 

Yeah I can see the logic there, so I'm not just being cheap by keeping my single plate, I'm just trying to save my 6 speed trans

 

I'd consider a single plate, it's definitely cheaper; but for my power goal I am not sure if it's sufficient.

 

LOL at this guy...

 

Yah truthfully I dont think its such a bad chassis and it can definitely be improved upon without an exboritant amount of effort. Fender braces, floor braces, roll cage, tower braces...with all that I can't see it being problematic certainly for street use and the occasional track day...

 

its actually a VERY stiff chassis with only minor stiffening mods like strut bars, sway bars, H brace, tie bar etc.. with the addition of a cage and chassis braces no stock ct9a in the world will be stiffer. anybody who thinks otherwise is obviously bias toward evo's.

not to mention you've already done like 80% of the wrench turning..lol