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      08-16-2018, 12:31 PM   #1
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Crank Hub Issue

Title says most, what is the general consensus on the crank hub issue? I'm assuming no fixes have been put in play..
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      08-16-2018, 11:00 PM   #2
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They updated the bedplate at some point, who knows if it was related. The failure rate is very low, seems to mostly affect earlier production DCT cars that are tuned. A worry if you are going for big power maybe, none of the bolt capture mods etc. have proven to work 100%. Most reports seem to have this happen on the dyno or while almost lugging the engine (7th gear 2k RPM and a lot of throttle, etc.).

I have followed the E92 M3 forums since release and the F8x forums and the failure rate is way, way below the rod bearing issue for S65. I might think twice about tuning during the warranty period though.
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      08-17-2018, 04:50 AM   #3
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Lugging the engine on any car is dangerous, especially a turbod one. I'm pretty sure I'm going to tune it 2k miles after I get it. It looks like the realistic worse case scenario is having to re time the vanos (and replace the crank hub so it doesnt happen again).

Catastrophic damage damage could be scene of the car is continued to be driven/beat on but I dont believe the valves being bent is that common. If the issue itself is .5% of cars, I'm pretty sure only like 10% of those get the catastrophic damage. That's pretty damn rare.
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      08-17-2018, 05:51 AM   #4
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Its not a huge issue. As someone the bedplate was changed when the comp pack came out (in all S55) and it seemed to help.

IIRC its more prevalent on highly modified DCT cars. Some theories that the no lift shifts or kickdown can be factors.

Last edited by dmk08; 08-17-2018 at 01:53 PM..
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      08-17-2018, 09:11 AM   #5
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Someone with 2018 M3 with 2k miles had a spun crank hub. It's just luck of the draw.
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      08-17-2018, 11:23 AM   #6
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That's why I'll break it in 2kish, haha
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      08-17-2018, 09:41 PM   #7
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Even happens on the N55s with Big HP 2k11 to 2k13
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      08-17-2018, 11:03 PM   #8
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Quote:
Originally Posted by David1 View Post
Someone with 2018 M3 with 2k miles had a spun crank hub. It's just luck of the draw.
And luckiest when you lose the draw within warranty I guess?
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      08-18-2018, 08:00 PM   #9
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Quote:
Originally Posted by ceedawg View Post
Even happens on the N55s with Big HP 2k11 to 2k13
Yup, E/F series N55 and S55 share the exact same crank hub parts.
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      08-19-2018, 08:30 PM   #10
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Quote:
Originally Posted by FSU_Logan View Post
Title says most, what is the general consensus on the crank hub issue? I'm assuming no fixes have been put in play..
On the f80 forums it seemed higher hp cars were more likely to have the issue, but could be coincidence.
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      08-19-2018, 08:56 PM   #11
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Quote:
Originally Posted by akkando View Post
On the f80 forums it seemed higher hp cars were more likely to have the issue, but could be coincidence.
I saw multiple people state 100% stock cars had it happen, so I really don't know.
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      08-19-2018, 09:40 PM   #12
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Seen more reports on 2018 so far than 2017.
6MT 2 of them
DCT 3 of them

Stock & Tuned, mostly related to kickdown or moneyshift(6MT) and bad tune.
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      08-19-2018, 09:51 PM   #13
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Quote:
Originally Posted by FSU_Logan View Post
Quote:
Originally Posted by akkando View Post
On the f80 forums it seemed higher hp cars were more likely to have the issue, but could be coincidence.
I saw multiple people state 100% stock cars had it happen, so I really don't know.
Competition cars that are stock are running higher hp than non competition. The thread I was looking at seemed to indicate higher hp pre competition cars more likely to have issue. In later model years, street l after the comp pack suddenly more untuned cars had an issue than before, at least with the small data set in that thread. I assumed that because to had higher hp stock cars because of the comp pack.
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      08-20-2018, 01:10 AM   #14
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Well, it appears from searching on the other forums that many of the tuners working on really high powered cars (600+) have had issues with the crank hub and have had to work on measures to stop it, with varying degrees of success. It certainly seems to be exacerbated by power output when you get to those levels.
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      08-20-2018, 01:12 AM   #15
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Quote:
Originally Posted by akkando View Post
Competition cars that are stock are running higher hp than non competition. The thread I was looking at seemed to indicate higher hp pre competition cars more likely to have issue. In later model years, street l after the comp pack suddenly more untuned cars had an issue than before, at least with the small data set in that thread. I assumed that because to had higher hp stock cars because of the comp pack.
Comp cars are making more power but not sure if they make more torque, they might actually make a little less early in the rev range. I think the sample size is too small to know though, as you mentioned.
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      08-20-2018, 08:11 AM   #16
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Quote:
Originally Posted by chris719 View Post
Well, it appears from searching on the other forums that many of the tuners working on really high powered cars (600+) have had issues with the crank hub and have had to work on measures to stop it, with varying degrees of success. It certainly seems to be exacerbated by power output when you get to those levels.
I'd be curious to see what the tuners would be altering.
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      08-21-2018, 12:37 AM   #17
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Quote:
Originally Posted by FSU_Logan View Post
I'd be curious to see what the tuners would be altering.
I'd post the link but it's censored...

search Google for What-is-the-best-BMW-F80-M3-F82-M4-S55-crank-hub-solution-Comparing-Maximum-PSI-s-multi-piece-keyed-crank-hub-to-Gintani-s-single-piece
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      08-21-2018, 07:26 AM   #18
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Quote:
Originally Posted by FSU_Logan View Post
I'd be curious to see what the tuners would be altering.
Torque down low mostly
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      08-25-2018, 08:40 AM   #19
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Quote:
Originally Posted by ceedawg View Post
Even happens on the N55s with Big HP 2k11 to 2k13
As it should because the design is a carryover from the N55.
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      09-06-2018, 10:00 AM   #20
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subscribed. I read a lot of the F8X forums about this. Seems most were DCT while using the kickdown. Also, a hand full of 6MT experience this, from possible money shifting? It definitely makes me more cautious of mine. Hopefully we dont hear of this happening on the M2C.
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      09-06-2018, 10:25 AM   #21
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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.
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      09-06-2018, 04:41 PM   #22
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Damn, gonna read up on this....kick down on the DCT is pretty damn aggressive, which would be exacerbated with a tuned car!
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