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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 01-03-2023, 10:54 AM   #29
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Originally Posted by churchx View Post
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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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.
True, the twin shaft was a solution to a number of engineering issues for car manufacturers, including official safety test requirements , NVH and packaging.

Initially my main concern was trying to keep overall weight to a minimum (the supercharger and other upgrades was a painful excercise in adding weight), so the single piece helped claw some valuable kilograms (5) back.

But the first alloy shaft ended up adding (strangely, not immediately but after a few months of use) an annoying high pitched whine on a trailing throttle, which was solved by changing to carbon.

For me (personally) the possible secondary safety benefits in specific types of impacts is not persuasive... but living with an annoying whine from the alloy prop shaft again, that could be the final straw!
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Old 01-03-2023, 01:27 PM   #30
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Ugh that sucks. I daily drove on a DSS AL driveshaft for 2 years and loved how amazing the shifting was, but the NVH was insane and the car felt noticeably slower when accelerating at highway speeds in higher gears (due to larger diameter maybe?). I took it off eventually
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Old 01-03-2023, 01:46 PM   #31
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Originally Posted by Ultramaroon View Post
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.
I'm not a fan of 2 piece driveshafts. I could always feel the play in the center bearing at low speeds. Changing to one piece made it much smoother. I did the same thing with my Isuzu Rodeo years ago after having to replace the center bearing twice. Had a custom one piece made. Never had a problem after that. Huge upside in my book.
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Old 01-03-2023, 02:09 PM   #32
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I'm not a fan of 2 piece driveshafts. I could always feel the play in the center bearing at low speeds.
This is what gets me. I don't like the presence of a center bearing. My VR4 was 3 piece and it was like playing telephone vs going 1 piece. I love the CF driveshaft on my FRS, hopefully Grump figures out what works best for him
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Old 01-03-2023, 02:25 PM   #33
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I love the CF driveshaft on my FRS, hopefully Grump figures out what works best for him
Yea, I like mine too.

I'm sure off road racing in one of these cars will always have more than its share of damage and mechanical challenges.
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Old 01-03-2023, 08:29 PM   #34
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Originally Posted by StraightOuttaCanadaEh View Post
Ugh that sucks. I daily drove on a DSS AL driveshaft for 2 years and loved how amazing the shifting was, but the NVH was insane and the car felt noticeably slower when accelerating at highway speeds in higher gears (due to larger diameter maybe?). I took it off eventually
Mine was really loud with tons of vibration. I'm just happy it didn't fail at triple digit speeds.
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Old 01-04-2023, 10:39 AM   #35
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Mine was really loud with tons of vibration. I'm just happy it didn't fail at triple digit speeds.
Funny, My AL DS was quiet and vibration free until it failed. At least DSS owned up to the problem.
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Old 01-04-2023, 02:52 PM   #36
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Mine was really loud with tons of vibration. I'm just happy it didn't fail at triple digit speeds.
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Funny, My AL DS was quiet and vibration free until it failed. At least DSS owned up to the problem.
I should mention I had Whiteline diff inserts installed at the same time, so it would vibrate at around 85-90 mph (which incidentally came on sooner if the car was traveling uphill). So I removed the inserts and it stopped vibrating. I did some googling and the diff inserts are also responsible for DS vibration on other platforms (Mustangs, BMWs, etc). Now the question is, did it stop vibrating simply because the inserts were no longer telegraphing the vibration to the rest of the structure, or did the angle change. Doesn't matter now of course, I'm back to the OEM driveshaft
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Old 01-04-2023, 03:12 PM   #37
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Originally Posted by StraightOuttaCanadaEh View Post
I should mention I had Whiteline diff inserts installed at the same time, so it would vibrate at around 85-90 mph (which incidentally came on sooner if the car was traveling uphill). So I removed the inserts and it stopped vibrating. I did some googling and the diff inserts are also responsible for DS vibration on other platforms (Mustangs, BMWs, etc). Now the question is, did it stop vibrating simply because the inserts were no longer telegraphing the vibration to the rest of the structure, or did the angle change. Doesn't matter now of course, I'm back to the OEM driveshaft
I have whiteline diff outrigger bushings, cusco diff brace, and SPL solid subframe bushings. Mine sounded like a metal box full of vibrators was in my trunk.

don't judge
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Old 01-04-2023, 03:15 PM   #38
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I have whiteline diff outrigger bushings, cusco diff brace, and SPL solid subframe bushings. Mine sounded like a metal box full of vibrators was in my trunk.

don't judge
well I still have the whiteline subframe inserts and after I took off the DS, I went and installed both front and rear diff bushings again haha. I love the feel and it reduced wheel hop a bit
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