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View Poll Results: Would you get a stage 1 software only tune without the crank hub fix?
Yes 238 69.19%
No 106 30.81%
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      06-18-2021, 10:26 PM   #67
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I’m just under 106,000 miles on my car with 101,000 of them on BM3 stage 1 91. No crank hub mods. No problems with the car except a broken gas pedal (a $150 fix). I drive my car hard. Oil changes between 10-12k. It’s a 2019 so not sure if the newer models have any differences to prevent crank hub failure, but I’m thinking no.
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      06-21-2021, 11:17 AM   #68
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Quote:
Originally Posted by Vegetable View Post
I’m just under 106,000 miles on my car with 101,000 of them on BM3 stage 1 91. No crank hub mods. No problems with the car except a broken gas pedal (a $150 fix). I drive my car hard. Oil changes between 10-12k. It’s a 2019 so not sure if the newer models have any differences to prevent crank hub failure, but I’m thinking no.
Encouraging to hear, I doubt the 91ACN tune would be anything to worry about from a CH perspective. I have heard many similar stories like this, not with as many miles, but same conditions.

I doubt that BMW made any changes to the S55 design as they were probably focused on getting the B58/sS58 platform going.
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      06-21-2021, 06:39 PM   #69
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Yes. Definitely.
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      06-21-2021, 11:38 PM   #70
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Quote:
Originally Posted by Boostd4 View Post
Encouraging to hear, I doubt the 91ACN tune would be anything to worry about from a CH perspective. I have heard many similar stories like this, not with as many miles, but same conditions.

I doubt that BMW made any changes to the S55 design as they were probably focused on getting the B58/sS58 platform going.
I run the regular stage 1 91 oct tune. When the ACN came out it stated "Beta" so stayed away from that. I have had no issues with the CA 91 gas with the non-ACN OTS tune.
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      06-22-2021, 02:05 PM   #71
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Quote:
Originally Posted by Vegetable View Post
I run the regular stage 1 91 oct tune. When the ACN came out it stated "Beta" so stayed away from that. I have had no issues with the CA 91 gas with the non-ACN OTS tune.
Good to hear, I would imagine that any 91 tune is going to be relatively tame just because of the nature of that grade of fuel. But, reassuring hearing your experience. How long have you had that map on the car? And have you tried the GTS/CS maps for comparison?
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      06-22-2021, 11:05 PM   #72
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Quote:
Originally Posted by Boostd4 View Post
Good to hear, I would imagine that any 91 tune is going to be relatively tame just because of the nature of that grade of fuel. But, reassuring hearing your experience. How long have you had that map on the car? And have you tried the GTS/CS maps for comparison?

Its been tuned for 101,000 miles now and about 2 years. When I first got the tune around 5,000 miles I tried the GTS and CS maps but they weren't nearly as fun as the OTS stage 1 91. I did need to upgrade the tires (type and size) as the stock MPSS tires were so overwhelmed by the power that it was a total shit show taking off from a stop light or accelerating in the rain. I typically run PS4S with 265/35/19s front and 285/35/19s rear and it hooks up great. I feel like the BM3 stage 1 91 with larger MP4S tires is the way this car should have been stock.
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      06-24-2021, 02:16 PM   #73
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Quote:
Originally Posted by Vegetable View Post
Its been tuned for 101,000 miles now and about 2 years. When I first got the tune around 5,000 miles I tried the GTS and CS maps but they weren't nearly as fun as the OTS stage 1 91. I did need to upgrade the tires (type and size) as the stock MPSS tires were so overwhelmed by the power that it was a total shit show taking off from a stop light or accelerating in the rain. I typically run PS4S with 265/35/19s front and 285/35/19s rear and it hooks up great. I feel like the BM3 stage 1 91 with larger MP4S tires is the way this car should have been stock.
Sounds like I'll need to pony up for tires. When I bought my car they put A/S Dunlops on the car and it's like driving on ice as is...can't imagine another 80 ft/lbs of torque making it any better. Thanks for the insight.
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      08-10-2021, 03:01 PM   #74
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Competition = 444 hp
CS = 453 hp
BM3 Stage 1 = 488.72 hp (https://f80.bimmerpost.com/forums/sh....php?t=1434679)
GTS = 493 hp

These cars all share the same internals, so theoretically it should be safe to run BM3 stage 1 tune. Can someone chime in if I'm missing something? I know the GTS the water injection system but I doubt that has anything to do with messing with the crank hub on that kind of power output.

Last edited by j2dad5389; 08-10-2021 at 03:09 PM..
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      08-10-2021, 08:14 PM   #75
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Quote:
Originally Posted by j2dad5389 View Post
Competition = 444 hp
CS = 453 hp
BM3 Stage 1 = 488.72 hp (https://f80.bimmerpost.com/forums/sh....php?t=1434679)
GTS = 493 hp

These cars all share the same internals, so theoretically it should be safe to run BM3 stage 1 tune. Can someone chime in if I'm missing something? I know the GTS the water injection system but I doubt that has anything to do with messing with the crank hub on that kind of power output.
GTS Map is more like 470
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      08-11-2021, 11:11 AM   #76
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Quote:
Originally Posted by Dav3 View Post
GTS Map is more like 470
rated for 493?
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      08-11-2021, 11:16 AM   #77
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Quote:
Originally Posted by j2dad5389 View Post
Quote:
Originally Posted by Dav3 View Post
GTS Map is more like 470
rated for 493?
The real M4 GTS, we are talking about the bm3 tune which doesn't include water injection

Iirc, guy on YouTube dyno'd stock and bm3 gts tune back to back and there was a 40hp difference
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      08-11-2021, 11:18 AM   #78
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Quote:
Originally Posted by Dav3 View Post
The real M4 GTS, we are talking about the bm3 tune which doesn't include water injection

Iirc, guy on YouTube dyno'd stock and bm3 gts tune back to back and there was a 40hp difference
I'm talking about these cars rated from the factory. If they can all handle their horsepower numbers while sharing the same internals, why shouldn't a stock M3/M4 be able to handle a stage 1 tune.
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      08-11-2021, 11:37 AM   #79
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Quote:
Originally Posted by j2dad5389 View Post
Quote:
Originally Posted by Dav3 View Post
The real M4 GTS, we are talking about the bm3 tune which doesn't include water injection

Iirc, guy on YouTube dyno'd stock and bm3 gts tune back to back and there was a 40hp difference
I'm talking about these cars rated from the factory. If they can all handle their horsepower numbers while sharing the same internals, why shouldn't a stock M3/M4 be able to handle a stage 1 tune.
Well, it should but unfortunately it still spins on even base stock power numbers

The general consensus is that it spins because of overwhelming torque that the crank hub sometimes can't handle. So naturally, feeding it more power automatically increases the likelihood of it happening. Statistically speaking, the more tuned the car is, the higher the percentage of spun crank hubs. That's what the data indicates.

This said, there might be some argument suggesting that spun crank hubs in cars within the "OEM" power threshold, might be the result of user error (e.g.money shifting, very aggressive kickdowns on max settings and from high gear).

I DIY installed the CBC and am on BM3 GTS Tune. In theory, without abusing the car too much, I shouldn't have issues.
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      08-11-2021, 01:37 PM   #80
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Quote:
Originally Posted by j2dad5389 View Post
Competition = 444 hp
CS = 453 hp
BM3 Stage 1 = 488.72 hp (https://f80.bimmerpost.com/forums/sh....php?t=1434679)
GTS = 493 hp

These cars all share the same internals, so theoretically it should be safe to run BM3 stage 1 tune. Can someone chime in if I'm missing something? I know the GTS the water injection system but I doubt that has anything to do with messing with the crank hub on that kind of power output.
Competition (444), CS (453) and GTS (493) are all crank numbers and not at the wheel numbers. I believe the BM3 stage 1 numbers are at the wheel.
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      08-11-2021, 04:07 PM   #81
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I just did my crank hub. When my mechanic, a trusted friend, said he hooked the breaker bar up to loosen the bolt, he barely had to apply any pressure before it broke loose. It wa moments away from slipping in factory form. The crank bolt is torqued down to 300+ ft/lbs, so for it to be that easy to loosen is a problem. Not trying to incite fear, but you're not safe, nor are you in danger on the stage 1. It's all a game of chance. But, I definitely wouldn't stage 2 it without doing the fix. Just my .02.

I did the 4 pin hub and a CBC.
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      01-14-2022, 02:56 PM   #82
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Quote:
Originally Posted by Graves View Post
I spoke at lengths with h2motors here in Germany who have their own CBC solution. They informed me that the CBC is a great solution. That generally speaking, the chances of a SCH is very low and they have seen only a few. They work on tons of M cars and have been fixing the issue from the start of the N54. Also said, they have a lot of cars running only the CBC with 700+nm. So, with all the nonsense I just typed, that's the solution I'm going with. 450€ parts and labor for piece of mind.


Unfortunately, the CBC itself does not give much ...:zmieszany2
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      01-20-2022, 10:19 AM   #83
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Personally i don't understand what a tune has to do with it.
How does a tune put more load on the camchain? It doesn't.
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      07-12-2022, 10:34 AM   #84
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Hi everyone. I am about to take posession of my first F80 M3 Competition so have read this thread with interest. The car will have extended premium factory warranty and servicing until November 2024 - but as it is not brand new I am mindful of how the previous owner treated it. I have 2 questions, given the potential damage the SCH might have and given that it obviously has happened to a reasonable number of cars, why hasn't BMW engineered a fix (and included a recall)? My second question is, given the volume of owners on this forum couldn't we collectively represent ourselves to BMW GmBh and ask them to consider engineering a more reliable OEM component and retro fit at no cost to owners? It would seem there are 100's of F80/82/83 owners here. I am in Australia so read there was a good place in Melbourne (Umberto??) however I am in Brisbane and, well, it isn't a short drive should I decide to do the SCH. As far as some comments around good will by dealers, I think that is a little hit and miss... I have owned BMW's for 22 years and have had 1 or 2 scenario's where the dealer came to the party (if not in full, with significant reduction in repair costs) and others where they have not. I haven't modified any of the cars I have owned (E36 M3, E60 550i, F30 328, F30 330) so whether that has meant additional "empathy" from the factory dealer I don't know. Interested in any thoughts.
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      07-12-2022, 03:39 PM   #85
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I believe BMW fixed it in the new engine and the reality is that this has happened to only a small subset of the total population. It’s easier to have them repair on a case by case also knowing a lot will probably be voided anyway due to tuning or modifications.
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      02-28-2023, 06:56 AM   #86
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Dusty off this old thread. Gldoing my first track day since getting Bootmod stage 1. Based on what I’ve read, I’m not too worried but thought I would see what this group has to say.

2018 ZCP 6 speed manual 44k miles. I’ve owned in a couple of years and did a few track days before stage 1.
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      02-28-2023, 01:32 PM   #87
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I just flashed stag 2 and installed a CBC. enough peace of mind until I need to open the engine and will do the hub then.
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