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BMW M2 Forum > BMW M2 Competition Model > "Money shift" on my 6MT M2 Competition - Car engine got replaced

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      10-22-2019, 03:46 AM   #1
SkyDubBlue
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"Money shift" on my 6MT M2 Competition - Car engine got replaced

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Here’s my money shift for your viewing pleasure

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
  • Story: German (original): here | English raw translation (Google): here
  • Additional video (engine replacement at the owner's expense): here.
On the original F87 M2, M2 LCI and M2 Competition featuring manual transmission, rev-match (auto blip) somehow 'warns' on downshift about over-rev before clutch release in all driving modes, except for DSC OFF mode. The cringing over-rev wail allows you just the moment of realization to refrain from releasing the clutch - you correct the gear shift without damage. However, in DSC OFF mode the driver shifts into a gearbox death trap: no warning 'over-rev wail' prior to releasing the clutch. The driver releases the clutch, followed by 'The Expensive Sound':
  • When you shift into a higher gear, rev-match will not be activated. So you will not hear anything particular. And that's OK, because no over-rev antics.
  • It's only when you shift into lower gear that rev-match will be triggered before you release the clutch (except when driving in DSC OFF mode): as soon as you enter/access the lower gear slot, rev-match is triggered. If you miss-shift, the cringing high-pitched wailing noise of revs unhealthily operating out of scope (impossible for rev-match to 'match' revs under that situation) will immediately catch your attention: almost as a natural 'uh-oh' reflex, you will immediately pull the gear stick out of that (wrong) lower gear slot into neutral whilst keeping the clutch pedal pushed.
Many people wonder why rev-match is hard-coded in all driving modes (except for DSC OFF mode) on the F87 M2 (no "sport"/"auto blip" on/off toggle as on the Cayman GT4). IMHO 'money shift' protection is one of the main reasons (or at least a fringe benefit).
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      10-22-2019, 07:29 AM   #2
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Well? How much $ did it cost you?
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      10-22-2019, 08:55 AM   #3
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Have you taken it in yet? Thrown rod, spun bearing, what was the final result?
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      10-22-2019, 09:40 AM   #4
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We need the deets!
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      10-22-2019, 09:56 AM   #5
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lmao
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      10-22-2019, 10:14 AM   #6
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So did you shift from 2-1 or from 4-3?

Share more details.
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      10-22-2019, 10:48 AM   #7
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I remember my first manual lol
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      10-22-2019, 03:46 PM   #8
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I thought that only happened on modded cars? Are you stock?
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      10-22-2019, 03:53 PM   #9
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That's hard to watch...
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      10-22-2019, 03:56 PM   #10
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Makes me want to cry... Poor car
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      10-22-2019, 04:00 PM   #11
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DCT next time for you
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      10-22-2019, 04:05 PM   #12
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Quote:
Originally Posted by RocketTR View Post
I thought that only happened on modded cars? Are you stock?
google "money shift"
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      10-23-2019, 08:55 AM   #13
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Quote:
Originally Posted by Kuervers View Post
google "money shift"
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.
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      10-23-2019, 09:40 AM   #14
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Oh no, sorry to see that man. Totally sux.

Iíve 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 didnít cause any damage. I think that car had better engine protection from over-revs.

Sorry man, feel for ya.
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      10-24-2019, 11:23 PM   #15
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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:
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      10-24-2019, 11:50 PM   #16
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thats why I learned to backhand shift

see http://store.uucmotorwerks.com/artic..._technique.htm

never miss a gear with this technique
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      10-26-2019, 04:21 AM   #17
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Quote:
Originally Posted by 5.M0NSTER View Post
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.
There is no such thing as protection from mechanical over-rev. You can cut fuel or spark or whatever you want, but the engine is going to reciprocate faster than it's supposed to.

Some engines just have more margin built in or you get lucky.
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      10-26-2019, 04:25 AM   #18
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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.
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      10-26-2019, 04:28 AM   #19
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Quote:
Originally Posted by xswesx View Post
thats why I learned to backhand shift

see http://store.uucmotorwerks.com/artic..._technique.htm

never miss a gear with this technique
+1

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.
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      10-26-2019, 07:30 AM   #20
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Quote:
Originally Posted by chris719 View Post
There is no such thing as protection from mechanical over-rev. You can cut fuel or spark or whatever you want, but the engine is going to reciprocate faster than it's supposed to.

Some engines just have more margin built in or you get lucky.
This margin you speak of is design safety margin for me. The V8 in my Mustang revved up in the money shift situation but only to a point. It stopped at the rev limiter and then I heard squeal from the rear tires. So at 7200rpm the engine had enough drag to significantly slip the rear wheels. Iím honestly not sure how Ford did this, but Iíve done it 2 or 3 times over the 5 years I owned and tracked the car with the same result. The engine never once over revved.

But the exact same behavior more than once is not chance. Itís design. Too bad BMW canít do that. Perhaps the inertia of a 5L V8 was enough with fuel cut and spark retardation. Perhaps there was more to it. I donít know. But itís possible to do.

Last edited by 5.M0NSTER; 10-26-2019 at 07:36 AM..
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      10-26-2019, 08:02 AM   #21
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Quote:
Originally Posted by 5.M0NSTER View Post
This margin you speak of is design safety margin for me. The V8 in my Mustang revved up in the money shift situation but only to a point. It stopped at the rev limiter and then I heard squeal from the rear tires. So at 7200rpm the engine had enough drag to significantly slip the rear wheels. Iím honestly not sure how Ford did this, but Iíve done it 2 or 3 times over the 5 years I owned and tracked the car with the same result. The engine never once over revved.

But the exact same behavior more than once is not chance. Itís design. Too bad BMW canít do that. Perhaps the inertia of a 5L V8 was enough with fuel cut and spark retardation. Perhaps there was more to it. I donít know. But itís possible to do.
Makes you wonder whether the traction/stability control is braking the rear wheels to prevent the over-rev. It's possible, I suppose.
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      10-26-2019, 08:10 AM   #22
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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 08:29 AM..
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