OEM TOB is crucial. I had the ACT XTSS sprung street disk and it was ok for 30,000 miles, but it got the high RPM lock out. I don't think the issue is the clutch friction disk rubbing against the pressure plate while the clutch pedal is pressed in (aka build quality), I think it has more to do with the friction disk being so big and heavy (rotational mass) that the added inertia doesn't allow the input shaft to slow down in time for the shift. Synchros wear out over time naturally, but they were working real hard with the street disk regardless of how I adjusted the clutch pedal. It's probably fine for those who stay under 6500rpm .

IMHO the Exedy twin sprung and ACT 6 puck sprung are the two best clutches for the evo 8/9 making more than 400 lb/ft trq. They are both daily drivable. Exedy triple is loud as hell though, don't buy it unless you have to. (launching at over 700trq)

 

Ya I let a guy put in the Exedy tob this last time, will be doing oem next time again. Also curious why the exedy twin SD is 400 bucks more then the hd....

 

That's a great question. I wonder if it's because they manufacture less of them since everyone wants the HD.

 

boo. once the HD wears out that was my plan actually (SD)

 

I run an ACT 4 puck with a Comp Clutch pressure plate. Light pedal feel, middle of travel engagement, no high RPM lockout issues. Wasn't a fan of my Comp 6 puck when I found 3 shattered pucks after only a couple thousand miles.

FWIW I've talked with Jon pretty lengthily as well and we didn't spend too much time talking about clutches but he never said anything against Exedy twins other than don't run them without sprung friction discs (which is why he never recommends triples).

If you're just doing road racing where there's no launches then you shouldn't need to worry about any restrictor nonsense, just make sure the friction disc(s) is sprung and that the clutch is bled and adjusted properly.

 

Has anyone considered the OS Giken twin with the movement alteration kit? The Exedy twin is the more common option, but I like the idea of the OSG twin in push configuration just a little bit more.

 

push clutch over pull all day every day. i dont know why more people dont convert them.

 

Push conversion adds weight and takes up a good chunk of space. If you use an ACT monoloc and a fork stop you'll never have any issues with the pull style stuff.

 

adds weight how? u literally ditch the slave cylinder and the fork (when going hydraulic) and replace it with a machined piece of aluminium which is light as hell. it would be half the weight of a factory pull type setup

 

We weren't discussing hydraulic throw out bearings. We were talking about mechanical push conversions. Last I checked those hydraulic TOBs have a pretty short life, but they do work. Like I said, it's pretty much impossible to have issues with a monoloc and a fork stop.

 

na they dont they last for a couple years or like 30,000km. will outlive a clutch. and you can buy bearing kits for them for like $80 and u just push the old bearing out new bearing in. easy as.

Sorry didn realise u were talking mechanical conversions i wouldnt even consider one

 

I ran the AMS (Tilton) Exedy Twin and Triple HTOB kit for a good while. It was fun, but they are only compatible with 5 speed evo transmissions and available only for very few clutch choices. Most of which are obnoxiously loud and overkill for a DD. I had to rebuild the HTOB due to it loosing it's lubrication about 10,000 miles in on the Tilton bearing. It made some high pitch squealing noises at times. One of the 2 screws holding the machined aluminum HTOB adapter plate to the HTOB backed out and got eaten by my pressure plate. Red Loctite and torque specs followed. After that I sold the entire kit to a track guy and went back to pull style with an ACT kit. It was interesting because it was self adjusting.

 

I was in the same situation but ended up going for a more exotic carbon single. It came with the push/pull conversion but I'm going to try to go to a hydraulic TOB on it. Is there any difference between the QM Tob and Tilton Tob?

 

they are pretty much identical deeman

 

buuuummmpppppppp...

Jon is building my trans, TC and rear right now. in speaking with him, he mentioned the new(ish) Organic Exedy twin. said he liked it and it was easier on everything. just wanted to get input from you guys too.. anyone ran one? thoughts? feedback? will be for mostly autox. part number MM022SDF