[Gami004pilot]

I have the Excedy stage 1 organic clutch with an ACT street light fly wheel and I noticed that when launching that the clutch seems to easily glaze and slip vs the stock which would grab hard and would not glaze up easily. Does any experience this same thing or even with a other after market clutch?

Do i have to change my launching style and be more aggressive and let go more quickly?
Is this clutch designed for this type of driving? Thanks for any info?

[ChristianCGM]

I don't think that its really a problem with the clutch as much as it is with the flywheel. Lighter flywheels have less mass, which means they are less of a heat sink, your flywheel is like a big one-sided brake rotor. They heat up faster, get hot spots easier/faster, and glaze clutches easier and faster.

Depending on what mods you have, the Exedy Stage 1 barely has the capacity for a tuned stage 2 car. From what I remember the Exedy Stage 1 holds around or less than 400 ft/lbs of torque at the flywheel. A tuned stage 2 car will have around 315-340 ft/lbs of torque at the wheels. Taking into account drivetrain loss the capacity of the Exedy Stage 1 is barely enough and sometimes not enough. If this is truly an upgrade from the stock clutch, then imagine how under-equipped the stock clutch is for at tuned stage 2 car.

[Gami004pilot]

WOW! makes me feel like I should have gone with a different more stronger clutch. I don't have any power mods at the moment, I just wanted to replace the OEM clutch because the I would not getting charged for labor install so I took advantage of the free install and purchased the light weight flywheel and new clutch.
In a way I miss the stock clutch because it was very easy to torque break with it but now its seems as if the new clutch can't torque brake at all and it quickly seems to glaze if I tried to. I'm not sure if it something to do with the Flywheel being lighter that causes the car to not torque brake the same as the stock set up. Or do I need to change my technique of launching?
It feel like the clutch is weak.

Does any else experience this with an after market clutch?

Could it be that maybe I need to adjust the clutch in some way? Is there such a thing as clutch adjustment or clutch pedal adjustment? Would a clutch line help?

[ChristianCGM]

With no power mods you are okay with that clutch. There is a clutch adjustment kit, I have not used it and know of no one that has, but at the same time I have not read any problems with it.

D-Wolf Clutch Kit
D-Wolf Clutch kit - Vendor Announcements - NASIOC

I am not sure what you mean by torque break.

Just how many times in a row were you launching the car? My experience with a stock clutch is that two really hard 5k rpm launches in a row the clutch, flywheel and pressure plate get hot enough that when trying a third the clutch pedal is a little soft and the clutch does not grab. Those parts really need to cool down enough so that they can grip, otherwise the clutch will continue to slip while the pressure plate and flywheel will get hot spots.

Edit: Break torque, do you mean to say that you put the car in gear, build you revs to where you want them, pull the e-brake and let the clutch out. So that when you want to launch the car you just have to let the e-brake go. Is that what you mean?

[Gami004pilot]

Another term used for torque brake is engine breaking. I have driven tractor trailers and this is a procedure used to help slow down the truck or car. It's when you are coming to a stop or a corner and instead of using the brake like a normal automatic car you would switch to a lower gear but as the stop or the corner approaches and while you have the clutch pressed down and while your going into that lower gear, you would use the low RPM's of the higher gear (don't rev match) to slow down the car down while you smoothly let off the cltuch in the lower gear which helps to slow down the engine/ car and keep the car in gear to easily press the gas ( to re accelerate) as you exit the corner or stop.

As far as for launching, with the stock clutch I would launch many times, more then five and barely get any glazing/slip with the clutch.
With the new excedy maybe three times and it would start to smell burnt and then easily would slip. Even rev matching causes a smell at times.
I wonder if the clutch would need to be adjusted or even the pedal or maybe a SS clutch line would help.

Originally Posted by ChristianCGM

With no power mods you are okay with that clutch. There is a clutch adjustment kit, I have not used it and know of no one that has, but at the same time I have not read any problems with it.

D-Wolf Clutch Kit
D-Wolf Clutch kit - Vendor Announcements - NASIOC

I am not sure what you mean by torque break.

Just how many times in a row were you launching the car? My experience with a stock clutch is that two really hard 5k rpm launches in a row the clutch, flywheel and pressure plate get hot enough that when trying a third the clutch pedal is a little soft and the clutch does not grab. Those parts really need to cool down enough so that they can grip, otherwise the clutch will continue to slip while the pressure plate and flywheel will get hot spots.

Edit: Break torque, do you mean to say that you put the car in gear, build you revs to where you want them, pull the e-brake and let the clutch out. So that when you want to launch the car you just have to let the e-brake go. Is that what you mean?

[ChristianCGM]

I see what you mean, I have always just thought of that as engine braking.

I think that overall I would not worry about it, because as long as it only slips when you are launching (your input to the clutch pedal tells it to slip) and not in a higher gear on the highway or going around town, then there really is no significant problem. The SS clutch line will help the pedal feel a tiny bit firmer, I have one and could not really notice that much of a difference. The adjustment kit will eliminate the unnecessary clutch pedal travel, again with a small difference in feel.

For my honest opinion, I have always thought and heard the Exedy clutches were not that great of a clutch, until I got a Subaru. People here seem to like them. I have always just stuck with ACT and RPS. My stock clutch was toast after 30k miles. I have been driving for the last 46k miles on a RPS Street Max with a resurfaced flywheel. I do 5k RPM launches and generally beat it up when the opportunity presents it self. I have had no problems at all.

[jays05]

As was said, lose the lightweight flywheel. With the lightweight flywheel you will have to slip the clutch more on the launch in order to keep it from bogging, that causes heat and in your case clutch slip.

I went the lightweight flywheel route, never again, my stock flywheel is getting resurfaced and put back on.

[Gami004pilot]

I Know many friends with Supra, Porsche, and many other high performance cars all mention that Excedy is highly rated clutch and is the manufacture of our STI stock clutches. They also make ACT and many other name brand clutches for other clutch companies.

I'm wondering if I'm causing pre-mature ware on the clutch by keeping the driving technique i have for the stock clutch?

[jays05]

Exedy does not have a good Subaru offering unless you want a twin-plate and don't make a lot of hp/tq, or you want a really ridiculous, really expensive clutch.

I loved my RPS 6-puck. I'm trying an ACT 6-puck this time around so I can compare.

[Gami004pilot]

Originally Posted by jays05

Exedy does not have a good Subaru offering unless you want a twin-plate and don't make a lot of hp/tq, or you want a really ridiculous, really expensive clutch.

I loved my RPS 6-puck. I'm trying an ACT 6-puck this time around so I can compare.

What makes an Exedy clutch so bad or not good?

[jays05]

Well they have the stage 1 full face disc which you have. The stage 2 which is a 3-puck The hyper single is proven garbage and the twin plate slips in high tq applications but is otherwise ok if you want to spend $1400+ on a clutch/flywheel. And then you are left with drag only carbon clutches. Unless I'm missing something.

ACT and RPS both make full face clutches which can easily take 400wtq+ with close to stock drivability. My old RPS 6-puck was not so bad to drive every day and my new ACT Xtreme 6-puck is rated to 741tq lol.