Like the title says, does anyone know what is the cause for this? They seem so hit or miss.

 

Idk it just happens, get some bushings, motor mounts, and torque damper and call it a day. It worked for me cause i had the same problem.

 

This topic has been covered by Dirk at ACT numerous times in the past 5 years about why you get lock out on any clutch. All you're going to get on here is reasons (some of them fact most of them BS) and some of them with a bias to the Exedy twin disc as to why people think lock out happens. Search his name on here ACTMan.

 

Adjust the clutch rod to prevent this.

 

+1 these things will help, if the problem is still occuring your disc is most likely warped from over heating

 

Thanks I'll have to try and search later. My computer at work was not letting me search, so I posted it.

 

I have also heard that is usually caused by improper installation.

 

bad install, better bushing motor mounts adj the clutch ect tons of threads on it

alot of people switch over to the exedy triple clutch,or tilton

 

the result is : FAST SHIFTING ? if not any idea to let the 1st go into the 2nd faster then the stock ???

 

i've talked to Daryl Sampson the Sales & Marketing Manager at ACT and here are some of his thoughts about high rpm lock out...

"Now about lock out. Lock out occurs when there isn't enough air gap between the disc pressure plate and the flywheel to allow the clutch to disengage at high rpm. The reason the above occurs are as follows: bent disc (hanging the transmission off the input shaft - install error, warped pressure plate, or flywheel - excessive heat - driver error as a result of slipping the clutch too much and a mis-adjusted or not even adjusted clutch - user/installer error."

other thoughts from Daryl...

"For as long as I've been in this industry people seldom admit that they are beating the hell out of a part and caused it to fail, mechanics seldom admit that they have no clue about what they are doing but will instead hide behind ASE certifications etc. and their are two sides to every story. We've been in business for 15 years, making a clutch for a Evo is not that much different than making a clutch for a STI or a RX7 or a Honda in pricinple. In fact the unit in the STI is the same size and very similar in design to the Evo and we don't hear of these issues on those cars."

"The Evo is one of our most popular kits, that's not by accident. Neither is the fact that we are an industry leader in the market. That only happens by hard work, and the dedication to not only make and design the best parts but also the dedication to stand behind them. I'm sure if you ask most of the people in the thread if they took the time to send the parts in to ACT to have the parts looked at by us, called us or taken their car to a reputable Evo shop to have it adjusted most will tell you no."

"The front motor mount helps a great deal with helping with engine movement and mis shifts which people also confuse with lockout, but since the cause of lock out has nothing to do with engine movement that in itself will not correct the problem."

"So to avoid lock out:

Have a qualified (read Evo specialist) install your clutch.

Have it adjusted via the threaded rod if it it's required. There are write ups in the how to section.

Know how to launch your car. By doing that part right you will avoid heating up the parts and causing lock out."

I'm sure of all people this guy knows....

 

Like I said earlier, you get lock out with ACT, Exedy twins and just about any clutch including the stock one. Most people that have ACT clutches that work don't make a post on here to brag about it. Most people that pay $1200 - $1400 for a clutch usually aren't going to come on here and brag about it when there clutch takes a dump prematurely. There are also vendors and there fanboys on here that promote one brand over another for there own reasons. Not to mention the fact that people expect a $500 clutch with a organic disc to work like a $1400 clutch with twin cermatallic discs and go to the strip and warp everything and then blame (insert manufacturer) and everyone but themselves.

I don't think anybody said that you had to install motormounts or anything else to make the clutch work but all of those things help significantly no matter what clutch you put in the car. Something as simple as a Blox lower mount helped my car go into gear smoother at high rpm on my stock clutch. Sometimes I read stuff on here and people will have you believe that something is far worse than it is but when you really look into the issue you'll see that there are more people that are happy with the product than they are unhappy. My 2 cents, good luck on whatever you decide.

 

Nice write up ...

 

i have the same issue on my ACT ...

 

i have the act xtreme with streetlite flywheel and no problems watsoever.... i can shift fast and launch hard as ***

 

My problem was that at high RPMS no matter how hard i shifted the gear wouldnt go into place, basically i had to wait almost a full second to get it in. no im not making this up ask my dad he drove the car at the track and said the same thing. I probably could have just done the bushings and it would have been ok but everything else was just because i wanted to ;-). No lockout and shifting at 7.8K rpms.