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  1. #1
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    Installed twin disc x-clutch and flywheel, now excessive noise.

    I installed a x-clutch twin disc, mfactory smfw, ecs transmission mounts, new guibo, and brass pivot pin. I get a crazy grinding chattering noise, and vibrations. The noise is only heard in gear under load and in neutral with revs. No noise with clutch depressed.





    These videos don't do it justice, its very load and apparent from inside while driving.

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    Sounds normal for a twin disc or single mass flywheel, in my experience.

    Slightly off-topic, but how are you running both a XClutch twin disc AND an MFactory SMFW?
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    Go back to oem or E46 m3 trans mounts to kill some NVH.

    Sounds normal for what you have installed. Welcome to twindisks lol

    You can also try having the PP and FW balanced. My m factory smfw was ridiculously out, like 10grams+

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    Click here to enlarge Originally Posted by suspenceful Click here to enlarge
    Sounds normal for a twin disc or single mass flywheel, in my experience.

    Slightly off-topic, but how are you running both a XClutch twin disc AND an MFactory SMFW?
    I did not think it would be this bad. Dam.

    I was wrong, M-factory is just distributing the set up. My mistake, sorry. So, the X-cluch group buy, whatever flywheel was in that set up.

    I did find this, and this is what mine sounds like from inside.


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    Click here to enlarge Originally Posted by fredcase Click here to enlarge
    I did find this, and this is what mine sounds like from inside.

    That's my car, lol. Filmed that before the XClutch twin disc I have in it now.

    What you're hearing is perfectly normal for a twin disc/SMFW. Like someone said above, OEM trans mounts will help a tiny bit. But 95% of it will still be there. It's a trade-off for the high clamping ability. Racecar stuff.
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    add some delrin shift arm bushings and a poly rear busing for extra race car activities.

    Kinda OT but @suspenceful did the body mounted shifter add or reduce nvh/buzzing shifter sounds?

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    Click here to enlarge Originally Posted by suspenceful Click here to enlarge
    That's my car, lol. Filmed that before the XClutch twin disc I have in it now.

    What you're hearing is perfectly normal for a twin disc/SMFW. Like someone said above, OEM trans mounts will help a tiny bit. But 95% of it will still be there. It's a trade-off for the high clamping ability. Racecar stuff.
    Lol, wow, I was going to message you on YouTube.

    I was driving around today, racking up city miles. It is defiantly, significantly, much more noticable with windows closed, radio off. Does some of it go away when broken in?

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    I have a twin disc with solid metal motor trans diff subframe mounts ....a noisy car is to be expected. i increased idle to 1k which makes it slightly more bearable and easier to drive.

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    I just raised idle, it helps a bit.

    What scares me most, is the neutral revs. I'm not comfortable with this level of vibration. as a machinist, millwright engineer, with previous drive train modding experience, I don't like the vibes. I'm going to put the oem trans mounts back, and see if the vibrations decrease. If not, that clutch/flywheel assembly will have to come off for balancing.

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    Your fine... your not hearing anything out of the ordinary.

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    The vibrations when revving the engine in neutral are felt, not heard, and they are nfg. I'm afraid the outer purple plate that is removed for installation does not have locating pins. It is only centered by socket head cap screws fastening it down. There is plenty of room for wiggle, and, to be of center.

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    Man, that's a bit of a bummer as these were advertised as being more on the quiet side than most if I remember right.
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    Click here to enlarge Originally Posted by JDUTHIE Click here to enlarge
    add some delrin shift arm bushings and a poly rear busing for extra race car activities.

    Kinda OT but @suspenceful did the body mounted shifter add or reduce nvh/buzzing shifter sounds?
    Honestly, I can't remember.

    Click here to enlarge Originally Posted by fredcase Click here to enlarge
    Lol, wow, I was going to message you on YouTube.

    I was driving around today, racking up city miles. It is defiantly, significantly, much more noticable with windows closed, radio off. Does some of it go away when broken in?
    No, what you're hearing won't get any better or worse.

    Click here to enlarge Originally Posted by fredcase Click here to enlarge
    I just raised idle, it helps a bit.

    What scares me most, is the neutral revs. I'm not comfortable with this level of vibration. as a machinist, millwright engineer, with previous drive train modding experience, I don't like the vibes. I'm going to put the oem trans mounts back, and see if the vibrations decrease. If not, that clutch/flywheel assembly will have to come off for balancing.
    People have gotten the whole assembly balanced with better results. Some are further off-balance than others. But even when perfectly balanced, the sound will not go away completely. Just be sure if you get it balanced to mark and install it accordingly.
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    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by fredcase Click here to enlarge
    I just raised idle, it helps a bit.

    What scares me most, is the neutral revs. I'm not comfortable with this level of vibration. as a machinist, millwright engineer, with previous drive train modding experience, I don't like the vibes. I'm going to put the oem trans mounts back, and see if the vibrations decrease. If not, that clutch/flywheel assembly will have to come off for balancing.

    Please keep us posted on the progress of indexing and balance.
    Last edited by dblrguy; 08-23-2019 at 07:45 AM. Reason: I'm dumb

  15. #15
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    I put the oem transmission mounts back in.

    99% of vibrations are gone, 80% of all that racket, and 30% smoother clutch engagement.

    This car is much more drivable now, and the noise I'm experiencing is what I was expecting.

    I've got 600km of break in, 400 to go and I'll start cranking the boost.

    I'm now happy with the clutch set up. Tranny mounts are defiantly a because racecar mod.

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    1000km in, and the engagement is finally getting smooth. Just topped it off to about e25 and will do some pulls later.

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    Yup, it starts getting a lot easier to drive after break-in.
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