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  1. #1
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    Twin Disk Clutch


  2. #2
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  3. #3
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    @dzenno said he drove a customer's car with one in it and didn't like it. FBIS put a review on e90post about it, but honestly that guy loved every part he put on his car and never had a bad thing to say about anything so not sure how much stock i'd put into that review. I personally run a twin disk on my Evo and love it. It's an exedy though and they told me they have no plans to make a twin disk for the e92/90 platform. South bend may be a better option to call and ask if they'd build something custom to try.
    2011 335is DCT, moving to Italy, looking for new car friends Click here to enlarge

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    I dont have experience with it on the N54 platform, but I do have an FX700 in my E36 turbo car.



    you better learn how to drive a clutch like a man if you want to use it.
    heel ON THE FLOOR, and modulate the throttle like a CHAMP. no letting the clutch out with your foot floating on the pedal. aint happening. i mean, unless you want to stall or spin the tires.


    the total clutch throw is about 6". I made a huge titanium valve as an adjustable clutch stop due to how short it is.
    this also means lightning fast shifts. think SMG sounding shifts.
    I had to disable my clutch switch, for obvious reasons (and i dont want to waste my thrust bearing starting it)
    the clutch from full off to full on is less than 5/8" of throw. it also engages like a light switch. ON or OFF.
    the entire thing (flywheel/clutch/pressure plate) IIRC weighs like 14 lbs.
    my car sounds very exotic how fast it can rev.
    my car looks like a 'tard behind the wheel at stop lights. there is literally nothing to help you get off the line.


    flat ground- your going to do ok 80% of the time. a little chatter, some squeaking but you'll get off the line.
    15% of the "bad" starts will be stalling it. over and over lol
    the other 5% will be you blowing the tires off and looking like johnny racer.

    its a pain to drive on. clutch pedal effort is high. Sometimes I can drive it like a champ and it drives pretty normal.
    other times, i look like a 16yr old kid who never touched a clutch before.

    if you are on a hill, bless your heart. you better be good at using your hand brake to hold and modulating high RPM with clutch to make it move.
    you WILL either stall it, or bark the tires/look like a jackhole. trust me on this.
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  5. #5
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    Click here to enlarge Originally Posted by bigdnno98 Click here to enlarge
    @dzenno said he drove a customer's car with one in it and didn't like it. FBIS put a review on e90post about it, but honestly that guy loved every part he put on his car and never had a bad thing to say about anything so not sure how much stock i'd put into that review. I personally run a twin disk on my Evo and love it. It's an exedy though and they told me they have no plans to make a twin disk for the e92/90 platform. South bend may be a better option to call and ask if they'd build something custom to try.
    Were SB dealers, they confirmed a while back they have zero plans to do a TD. Spec will make you one no problem, we were talking to them about it at Bimmerfest.

  6. #6
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    Spec TD huh? Interesting. That may be worth a shot I suppose?
    2011 335is DCT, moving to Italy, looking for new car friends Click here to enlarge

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    did anyone ever find out if spec offers a twin plate for N54?
    boop

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    The CM FX700 is a completely different beast than the FX850 though, @alex@ABRhouston. The FX850 has larger diameter discs and has different friction materials available, which make it much more streetable. I've driven an FX850 in an Evo X with the most street friendly combo (1 kevlar, 1 ceramic) and it was fine, absolutely nothing like what you've described. I looked up the FX700 though, and it does seem brutal. You should really try the FX850, you'll be surprised Click here to enlarge

    As for Spec, my cousin has a Spec twin in his Evo and the hydraulic TOB kept failing, and they didn't have a good fix for it. It also had two unsprung discs in it and was like a light switch in terms of engagement. Best twins I've experienced are Exedy, CM, and Comp.

  9. #9
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    FWIW, I had a CM FX650 twin in a supercharged '99 M Coupe. Easy to drive but lots of chatter.

    Neil

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    I have this.
    CM $#@!ed up my order 3 times resulting in 4 months of downtime and lots of out of pocket for what should have been a simple one day job.

    That said, they covered parts and of course not labor.

    Ive reviewed it before on this forum. It works well, I have a dual bronze disk version. Holds plenty of torque, no slip. I hardly stall it but valets and mechanics regularly do.

    Chatter is there:
    You cant hear it with the clutch in, really...
    You cant hear it while playing the radio...
    People know you arent a $#@!...

    If you are looking to get this kit - its nice, just req engineering specs and double check everything with a micrometer.

    Replace your guibo, get a defiv kit, solid disk hubs, ssk, solid trans mounts, diff & axles. It'll slay all day.

    As a final note, the throw out bearing is adjustable. If you set it according to CMs instructions itll be a coin toss of wrong.

    Try both settings out experimentally. You will thank me.
    LEMANS BLUE M-TECH E92->PROCEDE REV3::ETS 7" FMIC::RACELAND DPS::WAVETRAC DIFF::DEFIV DIFF LOCKDOWN::DEFIV OCC::DEFIV INTAKE::RB PCV

  11. #11
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    I emailed spec - they said they do offer it

    nfi on pricing or anything

    but now... People saying clutchmasters kinda sucks but is good when it works, others saying spec twin kinda sucks

    and no one else offers a twin, exedy isn't interested for whatever reason, the osg was abandoned..
    boop

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    Click here to enlarge Originally Posted by uniter Click here to enlarge
    CM $#@!ed up my order 3 times resulting in 4 months of downtime and lots of out of pocket for what should have been a simple one day job.
    I would not be happy or confident...
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  13. #13
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    My FX-850 just wore out. Never again. Going to try spec.
    pt6466 FFTEC 335i
    gtx3076r FFTEC Evo IX

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    Time four we discovered that the stack height was off by a few mm. Full clamp never applied and killed the discs. Dual bronze plus micrometer validated $#@! and defiv secret sauce modification means it'll last a bit longer.
    LEMANS BLUE M-TECH E92->PROCEDE REV3::ETS 7" FMIC::RACELAND DPS::WAVETRAC DIFF::DEFIV DIFF LOCKDOWN::DEFIV OCC::DEFIV INTAKE::RB PCV

  15. #15
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    Click here to enlarge Originally Posted by CaptainInsano Click here to enlarge
    My FX-850 just wore out. Never again. Going to try spec.
    How long did it last?
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  16. #16
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    How long did it last?
    Quite a while. Maybe 15k? It was just a **** to drive, and they had terrible customer service. Sent me the wrong flywheel bolts.
    pt6466 FFTEC 335i
    gtx3076r FFTEC Evo IX

  17. #17
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    Click here to enlarge Originally Posted by CaptainInsano Click here to enlarge
    Quite a while. Maybe 15k? It was just a **** to drive, and they had terrible customer service. Sent me the wrong flywheel bolts.
    I keep hearing stuff like this regarding the clutch companies. I don't get it.

    Spec puzzles me as well. A lot of guys run their clutch yet they are super quiet.
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  18. #18
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    i got a quote from spec at $1500 RRP for the full kit, 1000ft-lb holding twin disk?

    that sounds awfully cheap, almost suspiciously so.

    but.. it's spec, so :/
    boop

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    Sounds really good to me.
    pt6466 FFTEC 335i
    gtx3076r FFTEC Evo IX

  20. #20
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    google only shows a whole bunch of negative reviews, but mostly from 12-24 months or longer ago, and mostly saying spec is total rubbish... given they're pretty much the best for the N54/5 etc. though, i'll probably give them a go i guess.
    boop

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    The Spec Twin I've driven on in an Evo X was a complete nightmare, just saying. If it's anything like that, you will absolutely hate it for driveability. Don't go with the hydraulic TOB upgrade if you do get it

  22. #22
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    The spec stg 5 holds 820flt lbs. Should be enough for now no?
    E92 Bren Tune / E90 PTF Tune / E70 Twin Turbo Diesel JBD

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