07-15-2019, 11:57 PM | #23 | |
Private First Class
269
Rep 191
Posts
Drives: 2016 AY M4 - 2012 Nissan GTR
Join Date: Nov 2017
Location: In WOT land.. under a bridge near you
|
Quote:
|
|
Appreciate
0
|
07-16-2019, 08:43 AM | #24 |
Second Lieutenant
204
Rep 298
Posts |
I have 2k on the odo on my 2018 M3 and I'm already wanting a tune. And my warranty doesn't expire until Nov 2022. Scared to get a tune because of this weak link.
|
Appreciate
0
|
07-16-2019, 09:28 AM | #25 |
Lieutenant
373
Rep 464
Posts |
Kickdown occurs when you floor it hitting the button on under the accelerator pedal and down shifting simultaneously. This will put the car in the safest lowest gear for the engine rpm range thrusting you into warp speed.
|
Appreciate
0
|
07-16-2019, 10:12 AM | #26 |
Lieutenant General
14525
Rep 10,252
Posts |
I heard it can spin just looking at it while stationary.
|
Appreciate
9
ntg442891.00 NickyC18977.50 SakhirM410781.50 MR RIZK772.50 The Murder 335i81.00 G35POPPEDMYCHERRY5001.00 Lerxst M4142.00 M 4 FUN649.00 coleb42337.00 |
07-16-2019, 10:24 AM | #27 |
Colonel
2891
Rep 2,146
Posts |
|
07-16-2019, 12:33 PM | #29 | |
Colonel
3300
Rep 2,164
Posts |
Quote:
The vast majority of the spun crank hubs do not lead to catastrophic engine failures and the fix most of the time involves just retiming the motor with a new crank hub/bolt. All bets are off if you lose a motor while being tuned though since they will deep dive into the car's computer and find out you've been a naughty boy. The chances of a SCH are so rare and on top of that even rarer to lose a motor because of it, I wouldn't lose sleep over it. Good used S55 long blocks are getting cheaper every day, you can pick one up for $6-7k now, find a good indy shop or DIY and save 75 percent off what BMW would charge in the extremely rare event you do grenade your motor. Last edited by DanMpower; 07-16-2019 at 12:47 PM.. |
|
Appreciate
1
SakhirM410781.50 |
07-16-2019, 01:39 PM | #30 | |
General
21145
Rep 20,745
Posts
Drives: 2021 911 turbo
Join Date: Jan 2012
Location: Montreal
|
Quote:
__________________
Porsche 911 turbo 2021 992 GT Silver
Previous cars: M4cs 2019 F82 Limerock Grey / M4 2015 F82 Silverstone / M3 2008 E92 Silverstone / M3 2002 E46 Carbon Black |
|
Appreciate
2
TideMD294.50 rocklobsta110947.50 |
07-16-2019, 11:41 PM | #32 |
Lieutenant Colonel
1593
Rep 1,971
Posts |
|
Appreciate
0
|
07-17-2019, 03:00 AM | #33 | ||
Lieutenant Colonel
989
Rep 1,885
Posts |
Quote:
|
||
Appreciate
0
|
07-17-2019, 05:58 AM | #34 | |
Enlisted Member
22
Rep 36
Posts |
Quote:
__________________
ITAY
|
|
Appreciate
0
|
07-17-2019, 08:22 AM | #35 |
Private
48
Rep 92
Posts |
I've debated this with my mechanical engineering friends and it doesn't really make sense that the torque load on the front, pully side, of the motor would increase in a very meaningful way in relation to the torque output of the engine.
The torque used to drive the valvetrain and accessories vary with power output but no where near in the range that the output shaft on the rear of the engine experiences. Without load, revving the engine is among the fasted RPM changes the engine can experience, and I doubt its enough to spin the crank hub, tuned or not. I'd put money on it being related to kickdown and/or very aggressive upshifts in DCT or money shift in 6 Spd cars. Those are very large and abrupt changes of several thousand RPM nearly instantly and that shock force could be the culprit for the SCH problems |
Appreciate
0
|
07-17-2019, 10:44 AM | #37 |
Second Lieutenant
204
Rep 298
Posts |
5-6 out of 20 tuned cars you know have spun their crank hub? Those are absolutely terrible odds. Are the 5-6 you speak of more heavily tuned than the ones that have not spun or is the likelihood seemingly random? Any particular build year or mileage correlation or even driving habits that can be made?
|
Appreciate
0
|
07-17-2019, 11:27 AM | #38 |
Lieutenant General
14525
Rep 10,252
Posts |
Yes, which is why a lot of us don't get some of these threads. It is pretty clear that your chances go up quite a bit that if you tune an S55 that you will get the dreaded SCH. So if you do choose to tune, I think it is wise for one to also factor in the money to get one of the solutions that have been on the market for awhile now. But, most just want to tune on the cheap and then when it breaks, complain that BMW isn't warranting their car.
|
Appreciate
1
MuffinFlavored80.50 |
07-17-2019, 12:59 PM | #39 |
Second Lieutenant
81
Rep 259
Posts |
This is probably obvious but I just want to make sure it gets said: I would bet that there are a *lot* of stock M3 owners out there who don't know anything about f80.bimmerpost.com, but the majority of people tuning are all over the forums.
Echo chamber... |
Appreciate
2
minn1914524.50 Amgkiller1017120.50 |
07-17-2019, 01:02 PM | #40 | |
Second Lieutenant
81
Rep 259
Posts |
Quote:
Like, I have no problem buying what is basically a $2k mod acting as a "insurance policy" to make sure I don't blow up my engine. I don't know who would have a problem with that. :P It just becomes a weird area where... "I f*cking bought the mod to not have this problem happened... and it still happened!" Were there same cases of that reported? Upgraded crank hubs still spinning like DJs at a night club? |
|
Appreciate
0
|
07-17-2019, 02:03 PM | #42 |
Lieutenant General
18978
Rep 11,127
Posts
Drives: M4 CS. Former G82, x2 F82, F80
Join Date: Nov 2010
Location: Jacked out of my mind
|
|
Appreciate
0
|
07-17-2019, 05:14 PM | #43 | |
Lieutenant Colonel
1593
Rep 1,971
Posts |
Quote:
|
|
Appreciate
0
|
07-17-2019, 05:33 PM | #44 | ||||
Colonel
3300
Rep 2,164
Posts |
Quote:
Quote:
|
||||
Appreciate
0
|
Post Reply |
Bookmarks |
|
|