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  1. #1
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    2 out of 2 members liked this post. Yes Reputation No

    335iS DCT Broken Drive Shaft

    It was a matter of time when it was going to happen. With the addition of aftermarket downpipes came the increase in torque.

    So yes, and becareful, 450 wtq is the shaft breaking point.

    I broke mine tonight at the track perhaps mostly due to wheel hop

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    Click here to enlarge Originally Posted by BuraQ Click here to enlarge
    It was a matter of time when it was going to happen.
    At least you're honest about it
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    Click here to enlarge Originally Posted by BuraQ Click here to enlarge
    I broke mine tonight at the track perhaps mostly due to wheel hop
    Definitely the wheel hop, why did you stay in it?

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    The relatively low ratios coming out of the DCT probably make it more likely to break driveshafts than say an MT since 20% more torque has to go through the drive shaft.

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    Driveshaft or halfshaft/rear axle?
    Click here to enlarge

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    Clarified on shivpost that it was indeed his driveshaft.

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    Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
    Driveshaft or halfshaft/rear axle?
    Sooo, mind adding a diff lockdown kit to your list of parts to manufacture?
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    Click here to enlarge

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    450 wtq is not the "breaking point" of the driveshaft. Dragracing + wheel hop is.
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    All of those hard launches at the strip take its toll especially when there is wheel hop. Anytime that I sense wheel hop, I don't even bother staying on it and rather take a $#@!ty et.

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    as stated above its the wheel hop.. rolls ftw...

    i don't really launch my car.. esp since i have no lsd, but once i feel any hop i let off.. imo no $8 pass is worth it.. unless you were waiting for it to go.

    what route are you going to go?

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    Click here to enlarge Originally Posted by Tzu Click here to enlarge
    Clarified on shivpost that it was indeed his driveshaft.
    I don't think I've heard of anyone breaking his driveshaft before at the strip. That must've been some insane wheel hop.

    Click here to enlarge Originally Posted by lulz_m3 Click here to enlarge
    Sooo, mind adding a diff lockdown kit to your list of parts to manufacture?
    That and a driveshaft safety loop. I didn't think this could ever go on this car given how beastly and heavy the thing is.

    I've talked to Luis at the Driveshaft Shop about an upgraded driveshaft before, a few months back, and he said he was interesting in making a CF one for us. @BuraQ maybe this would be a great time to talk to Luis at DSS and see if he can make one for you to test out and send in the broken one so he can see where the snap occurred?
    Click here to enlarge

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    So the real question is did @BuraQ $#@! his pants after hearing the driveshaft break? I know i'd be like ohhhh fuuuuuucckkkkkk, that sounded expensive.
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    Click here to enlarge Originally Posted by lulz_m3 Click here to enlarge
    So the real question is did @BuraQ $#@! his pants after hearing the driveshaft break? I know i'd be like ohhhh fuuuuuucckkkkkk, that sounded expensive.
    LOL I know when my OEM rear axle snapped it sounded like a gunshot went off Click here to enlarge
    Click here to enlarge

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    I'd like to hear what it sounded like. Probably uneventful as it likely imploded and sheared torsionally. Would be interesting to see.

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    I broke mine as well, but it wasn't a catastrophic fail. This is where it connected to the differential

    Click here to enlarge

    Notice that the splines go like this /l/l/l instead of /\/\/\

    The worst part? The DS is not in stock anywhere in the country. I had to wait for a month for it to be sent from Germany.
    M3.
    Mazda3 that is Click here to enlarge

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    Click here to enlarge Originally Posted by onebadmofo Click here to enlarge
    I broke mine as well, but it wasn't a catastrophic fail. This is where it connected to the differential

    Click here to enlarge

    Notice that the splines go like this /l/l/l instead of /\/\/\

    The worst part? The DS is not in stock anywhere in the country. I had to wait for a month for it to be sent from Germany.
    Did you have an LSD in there back then? Wavetrac? These are the splines in the diff right?
    Click here to enlarge

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    Ouch.

    I haven't seen a 335 break an axle yet, which part broke?

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    Yeah, lets see a picture. I'd imagine it would have to be at the splines. I don't get any wheel hop with stock suspension no LSD and Michelin PSS. What combination are people using to get wheel hop?

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    Click here to enlarge Originally Posted by rudypoochris Click here to enlarge
    Yeah, lets see a picture. I'd imagine it would have to be at the splines. I don't get any wheel hop with stock suspension no LSD and Michelin PSS. What combination are people using to get wheel hop?
    Are you launching much at the drag strip? This'll mostly happen on a very sticky surface with street tires. I always recommend to everyone not to take their car to the drags unless they have proper rubber for the job Click here to enlarge lowered cars will also upset the geometry of the suspension in the back and will cause, on 6MT cars, rear axles (half shafts) to go...

    Splines going on a driveshaft or at the diff is a lot different than the thing snapping at the bar like what happened with my driver's side OEM rear axle (half shaft)...i'd love to know what happened here in @BuraQ's case, splines or snap?
    Click here to enlarge

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    Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
    I don't think I've heard of anyone breaking his driveshaft before at the strip. That must've been some insane wheel hop.
    You need to spend more time on the strip.

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    Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
    This'll mostly happen on a very sticky surface with street tires. I always recommend to everyone not to take their car to the drags unless they have proper rubber for the job lowered cars will also upset the geometry of the suspension in the back and will cause, on 6MT cars, rear axles (half shafts) to go...
    In the E9X I've found it to be more of a suspension issue than surface traction issue. I've had wheel pop on a poorly prepped surface.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    You need to spend more time on the strip.
    LOL I've got way more than my fair share of drag strip last 4 years..I meant to say I haven't heard of any N54s breaking their driveshaft at the strip

    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    In the E9X I've found it to be more of a suspension issue than surface traction issue. I've had wheel pop on a poorly prepped surface.
    Definitely a suspension issue for most yes
    Click here to enlarge

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    Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
    Did you have an LSD in there back then? Wavetrac? These are the splines in the diff right?

    Yep, had Quaife installed.
    Right before that my passenger side half-shaft went. Race/cage. Had crunching sound on low speed when giving gas.

    Edit: the splines pictured are in the DS.
    M3.
    Mazda3 that is Click here to enlarge

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Definitely the wheel hop, why did you stay in it?
    It was a single hard ass knock, not multiple, by time I reacted it was too late. I have had wheel hops plenty of times I eased of the peddle when it happened. Right after heating up the tires, launched, knock, game over....

    Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
    Driveshaft or halfshaft/rear axle?
    Driveshaft, I checked the rear axle, and short shafts, they are fine. No power to either wheel. There is a turning, tumbling and crunching sound come from in front of the diff

    Click here to enlarge Originally Posted by Autobahn335i Click here to enlarge
    450 wtq is not the "breaking point" of the driveshaft. Dragracing + wheel hop is.
    We are dealing with a DCT car using a traditional N54 driveshaft. It wasnt the shortshaft or axle that broke which is more common with supposed wheel hop

    Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
    ......
    @BuraQ maybe this would be a great time to talk to Luis at DSS and see if he can make one for you to test out and send in the broken one so he can see where the snap occurred?
    Waiting to see what the results are from the dealer...so far so good atm

    Click here to enlarge Originally Posted by lulz_m3 Click here to enlarge
    So the real question is did @BuraQ $#@! his pants after hearing the driveshaft break? I know i'd be like ohhhh fuuuuuucckkkkkk, that sounded expensive.
    Actually, I smiled and laughed when I realized what happened cause I was wondering for a very long time when it was going to happen. It couldnt have happened at a better time.

    Click here to enlarge Originally Posted by Zak@activeautowerke Click here to enlarge
    Ouch.

    I haven't seen a 335 break an axle yet, which part broke?
    Driveshaft

  25. #25
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    Click here to enlarge Originally Posted by BuraQ Click here to enlarge
    It was a single hard ass knock, not multiple, by time I reacted it was too late. I have had wheel hops plenty of times I eased of the peddle when it happened. Right after heating up the tires, launched, knock, game over....
    Bummer, it can happen that quickly. You can look into driveshaft upgrades now though.

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