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      09-14-2018, 12:28 PM   #23
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Quote:
Originally Posted by FSociety View Post
What I don't understand is how can you live without kickdown!
It's such a pain not being able to when every other bmw engine can.
F80 m3 is the first BMW I have yet to use it on after reading all the crank hub threads.
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      09-14-2018, 09:27 PM   #24
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Quote:
Originally Posted by GerardzM View Post
Damn, gonna read up on this....kick down on the DCT is pretty damn aggressive, which would be exacerbated with a tuned car!
Maybe I should stop doing this even on my N55...
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      09-15-2018, 12:36 AM   #25
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There have been 2 - 2018 MY that have slipped at the local dealership.
The 100% fix is to key it. I sent a customers engine to Carbahn Autoworks for a full build. Steve Dinan does a few others modifications aside from keying it that he says helps aid the failure.
I don't know about the kits being sold by a few companies here on the forums
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      09-15-2018, 03:05 AM   #26
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The design appears to be used across the BMW range (the hub - 11237574827 and sprocket - 11317502180) not just on the N55/S55, so...
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      09-15-2018, 11:41 AM   #27
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So I did some reading up on this issue. As stated before, a lot of the issues were from early MY14/15 tuned cars, and possibly the DCT aggressiveness.

I may have overlooked this, and feel free to point me in the right direction but I failed to see the issue documented on high HP N55s....but it's a carryover part to the S55??

Those tuned S55s must have been hitting super hard with that kick down function!

...and what's also crazy is that it's happened to people in stock form?
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      09-27-2018, 09:56 AM   #28
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We have installed a few Gintani kits now with great success for the S55.
We indeed had a 6spd 18 comp no mods spin the hub, 1,800 miles...
While in warranty I wouldn't worry much about the hub, others have mentioned that this is a very small amount of cars on the road but we also don't know the exact amount of cars affected since we only have what is stated on the forums.
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      10-05-2018, 08:39 PM   #29
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This is the only thing that fixed the issue.

https://maximumpsi.com/product/maxim...crank-hub-kit/
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      03-14-2019, 10:08 AM   #30
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So just curious, many more M2Cs with this spun crank hub issue?
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      03-14-2019, 10:12 AM   #31
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Looks like just 1 person with an M2c had a spun crank hub.

https://f87.bimmerpost.com/forums/sh....php?t=1589992
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      03-14-2019, 01:40 PM   #32
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Quote:
Originally Posted by chmura View Post
Looks like just 1 person with an M2c had a spun crank hub.

https://f87.bimmerpost.com/forums/sh....php?t=1589992
^That one was a bearing - not a SCH.
This is the only M2C one I've seen: https://f87.bimmerpost.com/forums/sh...6&postcount=32
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      03-14-2019, 01:51 PM   #33
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Quote:
Originally Posted by chmura View Post
Looks like just 1 person with an M2c had a spun crank hub.

https://f87.bimmerpost.com/forums/sh....php?t=1589992
I believe that is a failed Main bearing - not a spun hub.

Edit: beat me to it


Also - the guys drilling into the gears to "pin" them... I believe someone had theirs crack from drilling due to how those gears are manufactured.
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      03-14-2019, 03:07 PM   #34
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Quote:
Originally Posted by Proctor750 View Post
I believe that is a failed Main bearing - not a spun hub.

Edit: beat me to it


Also - the guys drilling into the gears to "pin" them... I believe someone had theirs crack from drilling due to how those gears are manufactured.
This happened with the TPG kit a few years back, drilling weakens the timing gear.

We've fitted a bunch of the 1-piece VTT SplineLock hubs and have an overview for M2C owners to better familiarize themselves with the process:

▀▄ eas | VTT "SplineLock" CrankHub Installation Overview for S55
https://f80.bimmerpost.com/forums/sh....php?t=1561598
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      03-14-2019, 03:52 PM   #35
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Quote:
Originally Posted by evolved///M View Post
^That one was a bearing - not a SCH.
This is the only M2C one I've seen: https://f87.bimmerpost.com/forums/sh...6&postcount=32
Has this issue plagued the N55 in the OG M2?

Sounds rare in the M2C so far.
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      03-15-2019, 04:38 PM   #36
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Quote:
Originally Posted by .2pdk View Post
Has this issue plagued the N55 in the OG M2?

Sounds rare in the M2C so far.
Never heard of it on an N55 M2.
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      03-15-2019, 04:52 PM   #37
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Quote:
Originally Posted by akkando View Post
Never heard of it on an N55 M2.
Neither have I but heard N55 prone as well.

I'm looking to get an M2C so interested in the prevalence of SCH in the detuned S55...
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      03-15-2019, 05:11 PM   #38
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Quote:
Originally Posted by .2pdk View Post
Has this issue plagued the N55 in the OG M2?

Sounds rare in the M2C so far.
To be fair the M2C is still relatively new, so not the same numbers out there as other F8x S55 platforms. It would seem the extra power produced by the S variant is contributing to the failures.

I’ve heard of an F80 that’s gone this week, it was running BM3 ST2.
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      03-15-2019, 05:36 PM   #39
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Quote:
Originally Posted by akkando View Post
Never heard of it on an N55 M2.
Never heard of N55 M2 but also because we don't see any above 550whp yet

Quote:
Originally Posted by JonD View Post
To be fair the M2C is still relatively new, so not the same numbers out there as other F8x S55 platforms. It would seem the extra power produced by the S variant is contributing to the failures.

I’ve heard of an F80 that’s gone this week, it was running BM3 ST2.
Its a hit or miss issue!

I've heard of more stock cars than tuned cars, but the most it seems they're using kickdown driving with traction on.

Very well documented Factory Weakness
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      03-15-2019, 06:50 PM   #40
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Quote:
Originally Posted by FSociety View Post
I've heard of more stock cars than tuned cars, but the most it seems they're using kickdown driving with traction on.

Very well documented Factory Weakness
Hit or miss due to factory defect or just kickdown use?
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      03-15-2019, 10:13 PM   #41
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Quote:
Originally Posted by .2pdk View Post
Neither have I but heard N55 prone as well.
N54 have had the issue as well, not as much though. There have been some cases on forums of N54's jump timing. N54 uses some of same crank hub parts as the S55/N55. S55 and N55 share the exact same crank hub parts. Vargas who produces the spline lock fix, has seen it happen on all three engines.

Last edited by hellrotm; 03-15-2019 at 10:19 PM..
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      03-16-2019, 06:55 AM   #42
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The M4 GT4 uses the same engine with no further enforcement on the bolt or gets a keyed crank hub yet these engines run close to 500hp on their most aggressive map (USB stick).

Very strange that we never heard about any racing team complained about the SCH

The short block replacement is 30,000km racing mileage

https://www.bmw-motorsport.com/conte...7626558586.pdf
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      03-16-2019, 08:14 AM   #43
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I'd been trying to find out what motorsport S55's were doing about this.

If it was a weekspot then racing would show that for sure.

Maybe race S55 runs a lightweight damper rather than the big heavy road car damper? So you don't have all that inertia issue?
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