10-22-2019, 02:46 AM | #1 |
M2_SkyBlue
40
Rep 11
Posts |
"Money shift" on my 6MT M2 Competition - Car engine got replaced
Featured on BIMMERPOST.com 4th to 3rd. Spun just under 9500rpm. Piston heads trashed, valves bent, but rods were straight. Crankshaft was irreparable as well. Connection from shaft to crankhub bolt was also destroyed. I had Vargas Turbos crankhub bolt lock on at the time. Was not stock. Stage 2, Catless Downpipes, EVenturi intake, BMS JB4 as boost controller, Bootmod3 stage 2 aggressive ots. Car is back on the road as of August ‘19 and more mods are on now. Feel free to share for science EDIT by moderator Artemis
|
Appreciate
6
|
10-22-2019, 07:55 AM | #3 |
Food Critic
1086
Rep 1,015
Posts |
Have you taken it in yet? Thrown rod, spun bearing, what was the final result?
__________________
|
Appreciate
0
|
10-22-2019, 09:14 AM | #6 |
Colonel
1558
Rep 2,505
Posts |
So did you shift from 2-1 or from 4-3?
Share more details.
__________________
2019 M2 Competition- October 2, 2018 ED
2011 BMW M3 Sedan Alpine White Picked up via ED 9/27/2011 & Redelivered 11/23/2011 **SOLD** |
Appreciate
0
|
10-22-2019, 09:48 AM | #7 |
Private First Class
108
Rep 120
Posts |
I remember my first manual lol
|
Appreciate
15
McPurrs290.00 B202034.50 Blindside_1376755.00 F82FTW74.50 ///M TOWN22103.00 SupremePower1243.50 M3 Adjuster7909.00 DreamerJoe253.00 nbennettksu1397.00 J.Gats_M423.50 premier3is1637.50 qnet684.50 giuls2219.00 AndrewC198910949.00 NYC Bimmer259.50 |
10-22-2019, 03:00 PM | #11 |
Brigadier General
2052
Rep 3,714
Posts |
DCT next time for you
|
Appreciate
16
|
10-23-2019, 07:55 AM | #13 |
Private First Class
124
Rep 132
Posts |
LOL, I know what money shift is....what I'm talking about is the crank hub issue. Mechancially over-revving an engine will normally result in bent valves (assuming an interference engine), but apparently in these cars the crank hub is an even bigger issue.
|
Appreciate
1
///M TOWN22103.00 |
10-23-2019, 08:40 AM | #14 |
Lieutenant Colonel
3360
Rep 1,823
Posts |
Oh no, sorry to see that man. Totally sux.
I’ve done 4 to 3 instead of 4 to 5 before in my Mustang, but all that did is locked up the rears until I got back on the clutch. It didn’t cause any damage. I think that car had better engine protection from over-revs. Sorry man, feel for ya. |
Appreciate
1
chris7197392.00 |
10-24-2019, 10:23 PM | #15 |
Moderator
30011
Rep 13,167
Posts |
The expensive sound, damn.
Let's not judge the driver for the pilot error (4th gear to 3rd instead of 5th) - these things can happen. Except for DSC OFF mode, rev-match warns on downshift, but as soon as you release the clutch, it's over-revving trouble. Story: German (original): here | English raw translation (Google): here Engine replacement:
__________________
///M is art ↔ Artemis
|
Appreciate
2
Robin_NL8782.50 Echoknight161.50 |
10-24-2019, 10:50 PM | #16 |
Enlisted Member
45
Rep 30
Posts |
thats why I learned to backhand shift
see http://store.uucmotorwerks.com/artic..._technique.htm never miss a gear with this technique |
Appreciate
16
chris7197392.00 smknjoe234.00 GTIGUY1992133.00 B202034.50 hoyas490131.50 VCP1390.00 beanbaguk458.00 MParallel556.50 svr2132.00 RedScytheM3394.50 mattpete13122.00 Niko ZV118.00 Yellowflash21369.50 330iToy71.00 Geo_33534.50 Kankles1485.50 |
10-26-2019, 03:21 AM | #17 | |
Major General
7392
Rep 7,340
Posts |
Quote:
Some engines just have more margin built in or you get lucky. |
|
Appreciate
1
M3 Adjuster7909.00 |
10-26-2019, 03:25 AM | #18 |
Major General
7392
Rep 7,340
Posts |
Do you know how fast you were going? Curious to calculate the exact revs you achieved. The video is too shaky for me to see. I am a little surprised you spun the crank hub as the failure mode here, but maybe I shouldn't be.
|
Appreciate
0
|
10-26-2019, 03:28 AM | #19 | |
Major General
7392
Rep 7,340
Posts |
Quote:
I use a less extreme version of this. I use a handshake grip for 1st and 2nd gear shifts, overhand grip for 3rd/4th, backhand for 5th/6th. |
|
|
10-26-2019, 06:30 AM | #20 | |
Lieutenant Colonel
3360
Rep 1,823
Posts |
Quote:
But the exact same behavior more than once is not chance. It’s design. Too bad BMW can’t do that. Perhaps the inertia of a 5L V8 was enough with fuel cut and spark retardation. Perhaps there was more to it. I don’t know. But it’s possible to do. Last edited by 5.M0NSTER; 10-26-2019 at 06:36 AM.. |
|
Appreciate
0
|
10-26-2019, 07:02 AM | #21 | |
First Lieutenant
342
Rep 396
Posts |
Quote:
|
|
Appreciate
2
5.M0NSTER3359.50 ///Mposter208.00 |
10-26-2019, 07:10 AM | #22 |
Lieutenant Colonel
3360
Rep 1,823
Posts |
Oh, good point! That would be quite a good solution! If not you should parent it. Really good idea.
Last edited by 5.M0NSTER; 10-26-2019 at 07:29 AM.. |
Appreciate
0
|
Bookmarks |
|
|