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ATS twin disc clutch

Posted by We're on Boost, Nov 27, 2020

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  1. We're on Boost

    We're on Boost Proven Member

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    Joined Aug 25, 2007
    Seattle area, Washington
    Wishing for a twin disc clutch that can do gentle street starts like this one.
    We have twins but not with disc material like this.
    This is an ATS carbon twin. This link should take you to where you can see a start from full stop, going from only about 2,000 rpm (can see the tach, barely). Doesn't seem like any chatter, or any drama to it at all, even though Josh says "It's a little grabby".
    Torque capacity as far as I know is higher than what we have with heavy spring singles, but hard to compare because the diameter is different.
    The other material available for Nissan twin disc is what Nismo calls "Copper Mix". Pictures of the friction material on those discs looks to me very much like what an ACT street organic disc looks like on our clutches.

    Anyway, here's the video. Later on he does some maneuvering in a gas station. Again looks perfectly painless. He says the engage point is higher than stock. Good. More disengage. I want that.

     

    5K  22

    1990 Eagle Talon TSi AWD
    650 whp · 510 lb/ft · 1G DSM

    2K  0

    1990 Eagle Talon TSi AWD
    manual · 1G DSM
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    1990TSIAWDTALON likes this.
  2. bastarddsm

    bastarddsm Proven Member

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    Mendota, Illinois
    Tilton carbon on a 15lb flywheel. Even a shitbox quartermaster with the right spring in in and the right flywheel isn't too bad.
     

    Showcar Build 7K  1

    1991 Eagle Talon N/T
    9.805 @ 144.00 · 1G DSM
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  3. We're on Boost

    We're on Boost Proven Member

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    Joined Aug 25, 2007
    Seattle area, Washington
    Hmm, the Tilton I guess would be an OT-II like this?
    I don't see them offering it as an assembly with a 1g 6-bolt flywheel though.
    I see it for Evos but not 1g 6-bolt.

    Tilton OT-II carbon racing clutch, 2 plate, orange spring (weakest).jpg
     

    5K  22

    1990 Eagle Talon TSi AWD
    650 whp · 510 lb/ft · 1G DSM

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    1990 Eagle Talon TSi AWD
    manual · 1G DSM
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  4. bastarddsm

    bastarddsm Proven Member

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    Mendota, Illinois
    They did at one time, but it likely had an ultra light flywheel with it. I ended up buying a clutch from a user on here and made my own flywheel. Was so awesome for street driving, but a little tough to use in a drag setting.
     

    Showcar Build 7K  1

    1991 Eagle Talon N/T
    9.805 @ 144.00 · 1G DSM
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  5. We're on Boost

    We're on Boost Proven Member

    1,160
    123
    Joined Aug 25, 2007
    Seattle area, Washington

    5K  22

    1990 Eagle Talon TSi AWD
    650 whp · 510 lb/ft · 1G DSM

    2K  0

    1990 Eagle Talon TSi AWD
    manual · 1G DSM
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  6. twicks69

    twicks69 Supporting Vendor

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    Milwaukee, Wisconsin
    The Spec clutch was discontinued. You would need to contact Spec directly to see if the clutch or flywheel is still able to be made.
     

    Drag Race Build 9K  13  76

    1999 Mitsubishi Eclipse GSX
    9.499 @ 155.00 · 2G DSM
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  7. We're on Boost

    We're on Boost Proven Member

    1,160
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    Joined Aug 25, 2007
    Seattle area, Washington
    Well that's interesting.
    I called Spec directly on Dec 2, at 800-828-4379, picked the phone tree item called "Sales and Tech Support" and talked to a guy there for about 20 minutes.
    He said the covers, discs, and floaters are in stock, but the flywheel might not be.
    Overall though, he didn't seem to know much about the clutch.

    A couple things he did claim to know were not what I wanted to hear.
    Like, he said that lighter springs are not available. You get the ones they rate for 1100 ft-lbs and that's it.
    And, he said TOB movement required would be the same as a stock clutch. I'm looking for something that can get complete disengage with a little less TOB movement, just because I'm getting tired of jamming the pedal into the carpet and even then not getting real consistent results.

    So I kind of decided that even if they do make these, I don't want to buy something that nobody can tell me how it's going to work in my car.
    I'm disappointed because that ATS clutch really does seem nice, and I thought maybe the Spec clutch could be similar.
    The GTR owner who made that video in post #1 is a neighbor of mine here in Bonney Lake. He also has a 1995 Silvia S14.
     
    Last edited: Dec 10, 2020

    5K  22

    1990 Eagle Talon TSi AWD
    650 whp · 510 lb/ft · 1G DSM

    2K  0

    1990 Eagle Talon TSi AWD
    manual · 1G DSM
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  8. twicks69

    twicks69 Supporting Vendor

    3,748
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    Joined Mar 12, 2004
    Milwaukee, Wisconsin
    Well if the clutch assembly is discontinued, I would bet that the flywheel is not available anymore. The rest are standard components.
    I looked up the part number for the clutch through Turn14 distribution and it is discontinued as of Feb 2020.

    As for the cover spring, I am surprised that there are no other spring rates available, as there are typically variations in a batch order and every spring should be checked and measured.

    As for the disengagement range, you aren't going to change it unless you change the bore diameters of the clutch master and slave, and install a pedal stop and adjust your pedal.
     

    Drag Race Build 9K  13  76

    1999 Mitsubishi Eclipse GSX
    9.499 @ 155.00 · 2G DSM
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