Glad you said this because I had always assumed that aftermarket flywheels would be more prone to warping than the heavier stocker. Do both the Prolite and the Streetlite have more meat than the stocker in the critical area for heat absorption?

 

i bought an ACT 6 puck, Gruppe-s 13lbs flywheel and a SS clutchline and i have ZERO clutch problems. I think its all in the clutchline with the exspansion

 

I've had excellent luck with the stock clutch at the 350whp level but I've been shopping for something that will hold when launching on R-compounds (stock doesn't).

I've had the pleasure to drive both an act HDSS w/streetlite and the TDHD. The Exedy twindisk made more noise than I had expected it to. When shifting slow the tranny sounds like it has marbles in it. When shifting fast it sounds like a lazy BOV and "whirrrsss". The thing shifted great and was very easy to drive but those noises drove me nuts. Current owner says after the first week you don't even notice them but I'm pretty sure I would.

I've also driven the HDSS. It felt just like stock with a bit less pedal travel prior to engagement. The owner laps the hell out of the car and has never had a lockout. Its been in the car for about a year but not very many miles. I guess time will tell.

Like others in here I read as many clutch threads as I come across. Lately I've been seeing quite a few people complaining about the exedy TDHD not lasting as long as they expected it to. That would worry the heck out of me because its not cheap!

There's one clutch that I've never seen a bad report on and thats the Exedy stg 2 clutch. Some hear chatter but most claim it just plain works. You may want to look at that piece as well.

 

Yes, both our flywheels are designed to be thicker than the stock Evo flywheel especially in the areas where the disc makes contact with it. Some aftermarket chrome-moly flywheels we've seen are thinner than the OE unit and have less material to resurface.

 

Well I'm going to assume that at the power level you're at ( you didn't list torque) that you are right at or have already exceeded the limits of the street disc. As I've stated earlier in this thread the disc could be bent (from installation or shipping) or warped from too much heat and if either of those are the case no amount of adjustment will solve the problem on any single or twin disc clutch.

Your clutch options are only limited by your budget and what a particular vendor/manufacturer has in stock at that time. Clutches aren't magic and none are invincible from heat, bad installation, poor quality parts and abuse no matter what anyone says.

My offer to look at the parts still stands so let me know if and when you're ready to do so.

 

I have seen a few good posts about the STG II Exedy as well. But its rated at 385 ft/lbs. And its a pucked clutch. Everyone knows pucked clutches are less than fun for street duties. They are excellent for fast shifting - due to their lighter weight.

BUT... with the same chattering compromises you would make with the STG II... you could have the HDG6.
And the ACT is cheaper.

I've been looking at all of this stuff for months. Weighing each option.

 

I'm sure you are correct that the envelope to hold 420-430ft/lbs has been breeched and that it may be causing my woes.

We went w/ this set-up like others that had success on DSM's w/ similar hp/tq for good streetability but i'm quickly learning that i should have tried something else whether a diff brand or even a different ACT set-up.

I do know that the clutch stinks it up off the line as i'm slipping it so that probably doesn't help out trying to shift at 8500 for the next few gears

I'm confident that it was not an install issue but you never know as we all make mistakes but other than that the clutch feels great when normally putting around on the street.

I'll send it out to ya to look it over once i order up a new clutch and yank the old one out.

 

I was using the ACT street with my EVO and it made over 460 ft/lb to the wheels and held the power just fine?

 

I have the XTSS and it works great!

 

fwiw - It's holding the power ok just not allowing me to shift at hi rpm's.

What did you car run et/mph wise @ 460 ft/lbs?

I take it it's not the one in your sig

Thanks.

 

If you're slipping the clutch as much as you say you are in the post above to smell it off the line, the disc may very well be warped which would cause the lock out problems you're having.

 

That's what i figured Did this ever since i installed it....i guess i was just hoping it would survive in there.

If i did decide to keep the ACT p/p what disc would you suggest for my application?

 

The exedy: definitely sounds like marbles, when out of gear. It definitely squelches every hard / fast shift. and it definitely chatters like hell, at low rpm and during the winter, as well as shudders on slow take offs, to the point where people look at you like something is wrong with your car.

and it definitely did not last as long as i expected it to... (only 34K for me, stock lasted 17K) *shrugs*

not only that - but when you bugger one or both of the friction disks, it keeps drifting out of adjustment, until you no longer have any more thread for adjustment.


I still wouldn't go with any other clutch

 

I'd probably recommend the 6 puck sprung disk which uses a more abrasive ceramatallic friction material that is more heat tolerant and has 28% more torque capacity compared to any organic friction material.

 

I got the ACT HDSS and the prolite flywheel. It came with the car. Anybody else have a screeching sound coming from the clutch when they release the clutch?