Crank Hub Issue Master Thread: What You Need To Know!

[mp335]

Originally Posted by CT_M3

If you search for the SCH poll conducted on this forum, based on the responses, the occurrence of a SCH is very very low (<3%) I believe on the stock cars. Even up to 550WHP it’s a small subset. At >550WHP, E85, it gets much higher.

Keep in mind, this is an enthusiast forum and people here run their cars harder than the general population and are more likely to complain.

I remember the days when the E46 S54 was such a big deal. NA with more than 100 hp/l. Just keep in mind that getting 500+ in 3L is pretty amazing.

I agree with you that SCH is likely small % but i am kind of person who buy cars and keep for 4+yrs don't want to pay for extended warranty and maintain my own car so even 3% chance of 15k+ expense is not encouraging specially if you want this car for track use. Other problem is unpredictable nature of the problem, if we knew exactly which models/years/conditions are impacted i would feel much comfortable, with current information we have every car feels like a ticking bomb. i still feel its a great car and current used prices definitely represent that SCH is not a concern in used market, but i would stay away since new m3 is out now

[CT_M3]

If you're going for track use and modding, just do the CBC and VTT Splinelock solution. At that point, you're good to tune the car past 600hp.

The cost is around 2-3k. I don't see that as a big hurdle. The new G80 is heavy, has floating brake calipers and isn't as track friendly. I'm totally passing on the G80; rather go P car route than get that.

Originally Posted by mp335

I agree with you that SCH is likely small % but i am kind of person who buy cars and keep for 4+yrs don't want to pay for extended warranty and maintain my own car so even 3% chance of 15k+ expense is not encouraging specially if you want this car for track use. Other problem is unpredictable nature of the problem, if we knew exactly which models/years/conditions are impacted i would feel much comfortable, with current information we have every car feels like a ticking bomb. i still feel its a great car and current used prices definitely represent that SCH is not a concern in used market, but i would stay away since new m3 is out now

[Walmart Parking Lot]

Does anyone know if anyone has spun on VTT V2? Also for those that do have the VTT v2 solution, have you done kickdowns?

[MadM2C]

Originally Posted by elinstylez

Any confirmed cases of SCH with just the CBC? I still haven't seen one so far that's not due to driver error.

No

[Chris@VargasTurboTech]

This is not factual, there was another one posted in the CBC thread. It's not common, but it does happen.

[MadM2C]

Originally Posted by Chris@VargasTurboTech

This is not factual, there was another one posted in the CBC thread. It's not common, but it does happen.

With actual documentation? That wasn’t driver error, that wasn’t a claim from someone with 1 post or a shop owner/part sale.

[Chris@VargasTurboTech]

Of course.

[NORAGRETS]

so if youre running stock boost or slightly above this is a upgrade you can omit, is that consensus?

[tom @ eas]

Originally Posted by Twhill19

so if youre running stock boost or slightly above this is a upgrade you can omit, is that consensus?

If this is a car you are planning to keep long term, get the crank hub solution. Otherwise, you're gambling.

[FrznM]

Originally Posted by Twhill19

so if youre running stock boost or slightly above this is a upgrade you can omit, is that consensus?

Get CBC and call it a day.

[NORAGRETS]

Originally Posted by aamirani

Get CBC and call it a day.

Originally Posted by tom @ eas

If this is a car you are planning to keep long term, get the crank hub solution. Otherwise, you're gambling.

Originally Posted by aamirani

Get CBC and call it a day.

Keeping long term yes. Last bmw I had was a 10 year'er

Can we recommend 1, 2, or 3 of the best crank hubs?

[clutchdj]

gintani

[TopJimmy]

Twhill19
In order of my preference:
Insane Performance style 1-piece 4-pin
MaxPSI style 2-piece 4-pin
MaxPSI style 2-piece 2-pin

[NORAGRETS]

Originally Posted by TopJimmy

Twhill19
In order of my preference:
Insane Performance style 1-piece 4-pin
MaxPSI style 2-piece 4-pin
MaxPSI style 2-piece 2-pin

Originally Posted by tom @ eas

If this is a car you are planning to keep long term, get the crank hub solution. Otherwise, you're gambling.

Originally Posted by aamirani

Get CBC and call it a day.

Your sig says Kies Hub, assuming that's crank hub, but you didn't list it, any reason?

[TopJimmy]

Originally Posted by Twhill19

Your sig says Kies Hub, assuming that's crank hub, but you didn't list it, any reason?

Kies sells and installed the MaxPSI style 4-pin in my F80.

I just had the 1-piece style installed in my F82s built motor. Billy at BMB sold and installed it when he built me up.

Both have a CBC on top.

[NORAGRETS]

Originally Posted by TopJimmy

Kies sells and installed the MaxPSI style 4-pin in my F80.

I just had the 1-piece style installed in my F82s built motor. Billy at BMB sold and installed it when he built me up.

Both have a CBC on top.

what would warrant going with a 4 pin hub vs a 2 pin?

[CT_M3]

Originally Posted by Twhill19

what would warrant going with a 4 pin hub vs a 2 pin?

Piece of mind against install error, I think. There's a incident where a crankhub failed with a 2 pin, which appeared to be a possible install error.

[TopJimmy]

Originally Posted by Twhill19

what would warrant going with a 4 pin hub vs a 2 pin?

4-pin is the new updated design but the 2-pin is just as good. Both need the CBC on top to be bulletproof.

The one noted failure of the 2-pin had no CBC on top and the crank bolt came loose (bad install). That's why a pin snapped, cause it rattled in the crank holes after the bolt had backed out.

[rosemont83]

Did BMW update the crank hub in the newer cars or are they pretty much unchanged since release?

[CT_M3]

Originally Posted by rosemont83

Did BMW update the crank hub in the newer cars or are they pretty much unchanged since release?

No updated hub. There was mention of a updated bed plate that was supposed to reduce the resonance but I think ultimately, the numbers are showing that they are occurring across the board regardless of year. The M2s also have the same vulnerability.

[GTME2010]

Cross posting from the poll results:

Here is the March 31, 2022 Poll Data summarized:

Stock [N=758] vs Modified [N=587]:
Stock F/R: 2.9%
Modified F/R: 18.9%

6MT [N=465] vs. DCT [N=880] + Stock vs. Modified
6MT:
Stock [N=277] F/R: 4.33%
Modified [N=188] F/R: 23.9%

DCT:
Stock [N=481] F/R: 2.08%
Modified [N=399] F/R: 16.54%

Failure Rate by MY
2015 [N= 459]: 9.59%
2016 [N= 323]: 8.05%
2017 [N= 192]: 7.29%
2018 [N= 371]: 13.21%

Interesting that the 6MT F/R is actually higher than DCT, since everything I've read seems to indicate harshness of DCT being a major factor. However, the biggest contributor is still modified vs. stock.
Also interesting that 2018 seems to have a slightly higher F/R than the other MYs even though the ratio of modified vs. stock is similar to other years.

[rosemont83]

Originally Posted by GTME2010

Cross posting from the poll results:

Here is the March 31, 2022 Poll Data summarized:

Stock [N=758] vs Modified [N=587]:
Stock F/R: 2.9%
Modified F/R: 18.9%

6MT [N=465] vs. DCT [N=880] + Stock vs. Modified
6MT:
Stock [N=277] F/R: 4.33%
Modified [N=188] F/R: 23.9%

DCT:
Stock [N=481] F/R: 2.08%
Modified [N=399] F/R: 16.54%

Failure Rate by MY
2015 [N= 459]: 9.59%
2016 [N= 323]: 8.05%
2017 [N= 192]: 7.29%
2018 [N= 371]: 13.21%

Interesting that the 6MT F/R is actually higher than DCT, since everything I've read seems to indicate harshness of DCT being a major factor. However, the biggest contributor is still modified vs. stock.
Also interesting that 2018 seems to have a slightly higher F/R than the other MYs even though the ratio of modified vs. stock is similar to other years.

No 2020 data?
That's weird on the 6mt being higher failure.. It does seem like everyone that is on ethanol has the issue