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  1. #51
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    Click here to enlarge Originally Posted by uniter Click here to enlarge
    The stock flywheel on my 07 335i exploded in this way. Bits flew through the bellhousing, luckily they hit the ground instead of getting into the cabin. The scariest part was that I wasn't even on it. The thing fatigued, the rubber barrier failed, and it disintegrated.
    Are you sure the bolts didn't just come loose holding the flywheel on? What rubber barrier?

  2. #52
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    Click here to enlarge Originally Posted by Torgus Click here to enlarge
    Are you sure the bolts didn't just come loose holding the flywheel on? What rubber barrier?
    The dual mass flywheel separated and exploded inside my trans. I didn't call in the CIA to investigate.
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  3. #53
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    Click here to enlarge Originally Posted by uniter Click here to enlarge
    The dual mass flywheel separated and exploded inside my trans. I didn't call in the CIA to investigate.
    What!? You didn't call the CIA? What is wrong with you? Did you at least call a competent mechanic, as it sounds like you don't turn your own wrenches. What did they say they thought caused it?

    Forgive my ignorance but what holds the dual mass flywheel together? What rubber barrier are you talking about?

  4. #54
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    Ive never in all my life seen an oem flywheel explode. However i did replace someones clutch at 14k miles because he was doing reverse burnouts....he said he 'drives hard' lol...

    I would assume you are fairly aggressive with yours as well...

  5. #55
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    Click here to enlarge Originally Posted by brusk Click here to enlarge
    CF or Aluminum any pushing enough power to worry about a shaft breaking should be running a hoop to make sure there's no accidents. Along the same lines how much power will the flywheel take might be a good time to look at a scatter shield also.
    Running a driveshaft loop with an aluminum or steel prop shaft is a good idea, and a scatter shield as well, but is it really necessary with CF?. When a CF driveshaft breaks it "brooms", so it won't pole vault the car and it won't tear up the underbody (though it will remove a lot of paint). I believe some race series do not require driveshaft loops with a CF shaft.

  6. #56
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    Click here to enlarge Originally Posted by andrew20195 Click here to enlarge
    Running a driveshaft loop with an aluminum or steel prop shaft is a good idea, and a scatter shield as well, but is it really necessary with CF?
    You're right. It wouldn't be required with a CF driveshaft.
    Click here to enlarge

  7. #57
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    "shrug" I didn't drag the last car, it was FBO with stock system. Nobody had ever been in there before. I don't think I drove it very hard, maybe it was from doing 300 mile trips at high-speed.
    If you guys want to feel safer about running your OEM flywheel then by all means discount what I'm telling you.
    The Dual Mass flywheel on my FBO car exploded, sending a shard through the bellhousing. Food for thought when considering replacement.
    LEMANS BLUE M-TECH E92->PROCEDE REV3::ETS 7" FMIC::RACELAND DPS::WAVETRAC DIFF::DEFIV DIFF LOCKDOWN::DEFIV OCC::DEFIV INTAKE::RB PCV

  8. #58
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    Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
    You're right. It wouldn't be required with a CF driveshaft.
    Why no driveshaft loop necessary with a carbon fiber shaft?

  9. #59
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Why no driveshaft loop necessary with a carbon fiber shaft?
    Didn't we just discuss why in this thread? Or do you have information that suggests otherwise?
    Click here to enlarge
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  10. #60
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    Click here to enlarge Originally Posted by klipseracer Click here to enlarge
    Didn't we just discuss why in this thread? Or do you have information that suggests otherwise?
    We did.

    CF will just disintegrate and won't go up through the floor or catapult the car up in the air like a steel/chromoly/alum driveshaft might.
    Click here to enlarge

  11. #61
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    Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
    No idea. Really not getting it for weight savings but for minimizing shock to drivetrain components. In case of breakage too though a CF driveshaft will just disintegrate and not go through your floor and catapult the car in the air.
    Aw man, i really wanted that catapult affect




  12. #62
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    Click here to enlarge Originally Posted by E90SoFlo Click here to enlarge
    Aw man, i really wanted that catapult affect
    lol Click here to enlarge
    Click here to enlarge

  13. #63
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    Click here to enlarge Originally Posted by klipseracer Click here to enlarge
    Didn't we just discuss why in this thread? Or do you have information that suggests otherwise?
    We did but I thought it was regarding twisting, can't what's left of the shaft still go up and in?

  14. #64
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    Carbon fiber is just a weave. It doesnt crack or chip off or anything...it will unravel into a million strands like a broom....worse thing that happens is you beat up the undershielding a little bit.

  15. #65
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    Click here to enlarge Originally Posted by Itsbrokeagain Click here to enlarge
    Carbon fiber is just a weave. It doesnt crack or chip off or anything...it will unravel into a million strands like a broom....worse thing that happens is you beat up the undershielding a little bit.
    Due to how they fail from what I read you don't really need one but the issue is drag racing regulations still seem to say you do. So trying to convince an official at a track...

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    Click here to enlarge
    Click here to enlarge
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  17. #67
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    1 out of 1 members liked this post. Reputation: Yes | No
    What is the long term durability of the part? Great for weight savings but will it fail over time?

  18. #68
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    So much torque, the chassis twisted coming off the line. Click here to enlarge
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  19. #69
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    Click here to enlarge Originally Posted by redlineryder Click here to enlarge
    So much torque, the chassis twisted coming off the line. Click here to enlarge
    I see what you did there.

    CF driveshafts are not a new thing.

    Click here to enlarge
    This this uses one...

    Advantages of Carbon Fiber
    • Lighter than steel or aluminum.
    • Three times torsional strength of steel.
    • Torsional spring rate allows better tire hook-up.
    • Torsional spring rate allows smoother shifting.
    • Less shock load to the differential.
    • Eliminates or dampens high speed vibrations.
    • Reduces transmission and differential breakage.
    • Characteristics can be varied by changing the wind, angles or diameter. PST offers both steel and 7075 Billet Aluminum yokes.
    • In drag racing applications - a better 60 Ft. time.
    • ET's have been lowered in some cases by as much as .120.
    • In stock car racing better control out of corners is the result of the torsional spring rate.
    • In road racing smoother shifting and better durability of transmission and differential have been reported.
    • Tested on Cobra's at 180 MPH on Dyno with no vibrations.
    • A much greater safety factor - carbon fiber will return to a fiber and not create shrapnel under the car, as would aluminum or steel shafts.



    Carbon fiber driveshafts have been used in most forms of professional racing for years...

  20. #70
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    Click here to enlarge Originally Posted by Torgus Click here to enlarge
    Eliminates or dampens high speed vibrations.
    I thought potential vibration was one of the main downsides?

    I'm convinced now though I want a carbon fiber driveshaft. I'll be talking to DSS as soon as they are officially onboard.

  21. #71
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    I thought potential vibration was one of the main downsides?

    I'm convinced now though I want a carbon fiber driveshaft. I'll be talking to DSS as soon as they are officially onboard.
    The CF weave absorbs vibrations rather than transmitting them like metal does.
    Click here to enlarge
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  22. #72
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    Click here to enlarge Originally Posted by rader1 Click here to enlarge
    The CF weave absorbs vibrations rather than transmitting them like metal does.
    So then it seems there are no downsides.

  23. #73
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    So then it seems there are no downsides.
    Unless you experience bad wheel hop(as discussed earlier) there really isn't. Cost could be considered one downside but you get what you pay for and, for most people on here, that's not really an issue anyway.
    Click here to enlarge
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  24. #74
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    Click here to enlarge Originally Posted by rader1 Click here to enlarge
    Unless you experience bad wheel hop(as discussed earlier) there really isn't. Cost could be considered one downside but you get what you pay for and, for most people on here, that's not really an issue anyway.
    So combining this with the wheel hop elimination kit and... you should be golden.

    I'm in.

  25. #75
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    So combining this with the wheel hop elimination kit and... you should be golden.

    I'm in.
    Pretty much. There is some truly awesome developments going on for this platform right now. Funny how e90 is involved in or supporting none of it..
    Click here to enlarge
    MOTIV750, MOTIV P-1000 PI, MOTIV/FUEL-IT! low pressure fuel system, AEM EMS/COBB AP, Aquamist HFS-3, ETS FMIC, SPEC stage 3+ clutch/SS flywheel, BC Racing coilovers and VMR wheels wrapped in Hankook RS3s.

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