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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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01-02-2023, 01:03 AM | #15 |
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The mid muffler.
The break was midway above this. Heat could definitely be a factor. |
01-02-2023, 01:52 AM | #16 |
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Is it also possible that the muffler could have bounced or been bumped into the drive shaft?
Haven't seen harmonics mentioned so I'll throw it out there as a possible contributing factor. If you are racing around off road it's possible you hit some weird frequency between the front and rear bouncing around at different rates and moving around relative to each other. If it's a track, that might be repeated each lap. More likely heat or muffler related though.
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01-02-2023, 02:10 AM | #17 |
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At least it was spectacular.
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01-02-2023, 02:42 AM | #18 |
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There's evidence of a polish mark on the muffler (cover?) and the weld looks like it's missing some material?
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01-02-2023, 08:03 AM | #19 |
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01-02-2023, 08:07 AM | #20 | |
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01-02-2023, 08:11 AM | #21 |
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01-02-2023, 08:53 AM | #22 |
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I was looking at the same thing. My DDS AL shaft broke exactly in the middle due to exceeding its critical speed.
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01-02-2023, 02:44 PM | #23 |
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Ah, that was yours! Now I remember. You were on a dyno and felt no warning.
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01-02-2023, 07:24 PM | #24 |
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Since you already have the machined end parts have you considered buying a CF driveshaft blank and bonding up a new one?
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01-02-2023, 07:52 PM | #25 |
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I don't trust anything DSS makes after your failure. That was a huge oversight by a company that has "drive shaft" in their name.
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01-02-2023, 07:55 PM | #26 | |
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01-03-2023, 02:18 AM | #27 |
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Wasn't stock 2-piece made such, so that to allow it to buckle in case of frontal crash impact, so that engine can be pushed under passenger compartment?
It's drawbacks .. i guess slight (but probably not that immense) play in extra joints, slightly more expensive .. and a bit heavier .. hmm .. i wonder if it's not worth to leave it as is, if it's designed/engineered for extra safety .. |
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01-03-2023, 02:34 AM | #28 |
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Yes. Also with all other properties being the same, shorter driveshaft will be able to spin faster without failing. I'm not a fan of any of these single-piece driveshafts. The only upside is a few kilos trimmed. Not worth it.
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