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    1. Member Jimmy Russells's Avatar
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      02-14-2020 12:56 AM #126
      Quote Originally Posted by MVZOOM View Post
      I don't understand how the car didn't compression lock the rear wheels and cause him to spin / crash / roll. Normally an over-rev results in compression lockup, no?

      it almost sounds like someone removed the rev limiter, he no-lift-shifted, missed the gear and it revved to death. Reality is that it stayed 'revving' for a long time.

      Something doesn't make sense.
      Because it instantly broke. That much rev is straight up instant valve float. Valves contact pistons and all compression is lost.

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      02-14-2020 04:28 AM #127
      Quote Originally Posted by Cabin Pics View Post
      There is no way that motor over-revved mechanically without the clutch engaging. None, zero.

      Stop believing everything people tell you on the internet.

      If my house burns down and you find me with a gas can and a lighter, I say I didn't do it, do you believe me? The guy posted a video of the car very clearly being mechanically over-revved. Software is not going to do that.
      If his tune removed the rev limiter, it doesn't appear that there is anything to prevent the engine speed adaptation for a gear change feature from over-revving the engine.

      Here's the technical training doc for the F80/F82: http://f80.bimmerpost.com/forums/att...5&d=1406475520

      Page 35 states that there is "No engine speed recording via the synchronization unit."
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    4. 02-14-2020 05:31 AM #128
      ouch. In for the "well known van CNC machine" to do some work here.

      also, someone please post an engine of an RV towing a car while it was in gear. that should post a good explanation

    5. Member
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      02-14-2020 08:13 AM #129
      Quote Originally Posted by MVZOOM View Post
      I don't understand how the car didn't compression lock the rear wheels and cause him to spin / crash / roll. Normally an over-rev results in compression lockup, no?

      it almost sounds like someone removed the rev limiter, he no-lift-shifted, missed the gear and it revved to death. Reality is that it stayed 'revving' for a long time.

      Something doesn't make sense.
      Makes plenty of sense. Even at high revs engine braking never locks the rear tires. The tires would only lock up if the engine seized and honestly the momentum of the car might just bust through whatever locked the engine up anyway. I don't understand why people need there to be a conspiracy. The obvious answer is the right one here.

    6. Member
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      02-14-2020 08:14 AM #130
      Quote Originally Posted by ND40oz View Post
      If his tune removed the rev limiter, it doesn't appear that there is anything to prevent the engine speed adaptation for a gear change feature from over-revving the engine.

      Here's the technical training doc for the F80/F82: http://f80.bimmerpost.com/forums/att...5&d=1406475520

      Page 35 states that there is "No engine speed recording via the synchronization unit."
      So what tune did he have, and why hasn't anyone else nuked their engine with it?

      He mechanically overrevved it man. This is not the hill to die on

    7. Member MGQ's Avatar
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      02-14-2020 08:43 AM #131
      Even with no limiter, it’s not going to rev past 11k in neutral and explode. It is forced to by the inertia of the car turning the wheels and spinning the transmission/engine. That’s why this is referred to as a “mechanical overrev”.
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      02-14-2020 08:52 AM #132
      Quote Originally Posted by CTK View Post
      So what tune did he have, and why hasn't anyone else nuked their engine with it?

      He mechanically overrevved it man. This is not the hill to die on
      No one is dying on any hill for this, this has just been discussed ad nauseam months ago. He states in his first post what mods he has:

      Was not stock. Stage 2, Catless Downpipes, EVenturi intake, BMS JB4 as boost controller, Bootmod3 stage 2 aggressive ots.
      Believe him or don't, having the rev match feature in one of my vehicles makes me want to understand what its limitations are. But theres no way in hell I'll purposely try miss-shifting to see what happens.
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      02-14-2020 09:03 AM #133
      according to "automobile-catalog", the M2 competition will do 144mph in 4th gear. 3rd gear is 14.7mph per 1000rpm
      so 144/14.7= 9.8 -> 9,800rpm

      a fair bit higher than it's 7,600rpm redline

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      02-14-2020 09:15 AM #134
      Quote Originally Posted by g34343greg View Post
      according to "automobile-catalog", the M2 competition will do 144mph in 4th gear. 3rd gear is 14.7mph per 1000rpm
      so 144/14.7= 9.8 -> 9,800rpm

      a fair bit higher than it's 7,600rpm redline
      It looks like he was shifting at 6900 rpm, which works worked out to 132 mph using a 26.3" tire, he'd need 9000 rpm in 3rd gear to match it. Not that it really matters lol.
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    11. Member cockerpunk's Avatar
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      02-14-2020 10:16 AM #135
      Quote Originally Posted by ND40oz View Post
      If his tune removed the rev limiter, it doesn't appear that there is anything to prevent the engine speed adaptation for a gear change feature from over-revving the engine.

      Here's the technical training doc for the F80/F82: http://f80.bimmerpost.com/forums/att...5&d=1406475520

      Page 35 states that there is "No engine speed recording via the synchronization unit."
      no
      Quote Originally Posted by ice4life View Post
      Sounds great. Maybe I'm just a fascist and didn't know it.. I don't know if I even care anymore.

    12. How do I resize a picture? Cabin Pics's Avatar
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      02-14-2020 10:26 AM #136
      Quote Originally Posted by ND40oz View Post
      If his tune removed the rev limiter, it doesn't appear that there is anything to prevent the engine speed adaptation for a gear change feature from over-revving the engine.

      Here's the technical training doc for the F80/F82: http://f80.bimmerpost.com/forums/att...5&d=1406475520

      Page 35 states that there is "No engine speed recording via the synchronization unit."
      I don’t understand why you’re defending this?

      Are you the guy in the video?

      Guy shifted from third to second. Period.

      Tune, no tune, doesn’t matter, the engine popped because clutch made contact with pressure plate. Engine spun same speed as transmission. Valves floated away, goodbye motor.

      For everyone thinking that losing a motor has to be this noisy chaotic experience, stop thinking that. Tires don’t lock up, you don’t have to have terrible rod knock or holes in the block, it can seriously just be a quiet loss of compression. Foof, no more power. That simple.
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    13. Planters (fasciitis) peanuts. Dang dogg Sold Over Sticker's Avatar
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      02-14-2020 11:09 AM #137
      Quote Originally Posted by ND40oz View Post
      No one is dying on any hill for this, this has just been discussed ad nauseam months ago. He states in his first post what mods he has:



      Believe him or don't, having the rev match feature in one of my vehicles makes me want to understand what its limitations are. But theres no way in hell I'll purposely try miss-shifting to see what happens.
      Let’s go with Occam’s razor. As long as you dont mechanically over rev your car, your DME isn’t going to do it. It’s utter nonsense that he had the clutch in and it spun up to 10k rpms trying to rev match.
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    14. 02-14-2020 11:14 AM #138
      Quote Originally Posted by kiznarsh View Post
      This is now the shifting thread.


      Sounds good. Tried out knifey spoony style this morning.


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    15. Member
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      02-14-2020 11:19 AM #139
      Is it like a requirement to have an SS to post here??!??

    16. Planters (fasciitis) peanuts. Dang dogg Sold Over Sticker's Avatar
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      02-14-2020 11:23 AM #140
      Quote Originally Posted by CTK View Post
      Is it like a requirement to have an SS to post here??!??
      Yes. They don’t auto rev match so it’s safe.
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      Quote Originally Posted by Phillie Phanatic
      SoS - please shoot a message when Brendan & His Retarded Sycophants has another gig. I’ll be there, front row.

    17. Millennial Pizza Cat's Avatar
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      02-14-2020 11:31 AM #141
      Quote Originally Posted by CTK View Post
      Is it like a requirement to have an SS to post here??!??
      Current or Legacy owner, yes.
      SS registry owner-emeritus

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    18. Geriatric Member absoluteczech's Avatar
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      02-14-2020 11:39 AM #142
      Quote Originally Posted by Sold Over Sticker View Post
      On the way home, to make sure I didn't even get close to money shifting, I did the Cross Legged Monkey Foot. Best part of all is that you can't claim I did anything with the clutch since my left foot is no where near it.

      Pro level **** right here ladies and gentlemen

    19. 02-14-2020 11:55 AM #143
      I find BMWs to have a little too light of a feel when shifting, so I tend to shift with two or three fingers to ensure that I don't ram it into a money shift.

      I've found Tremecs in Corvettes to be a bit too stiff and it's easy to accidentally select the wrong gear because you have to use a fair bit more force to shift. That must be partially due to the cables because the same trans in a Camaro is just fine to shift (direct shifter versus cables due to transaxle).

    20. 02-14-2020 12:03 PM #144
      Quote Originally Posted by Pizza Cat View Post
      Current or Legacy owner, yes.

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    21. Member H.E. Pennypacker's Avatar
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      02-14-2020 12:08 PM #145
      Let me guess without reading the responses, was there gum in SoS's cup holder? I bet there was gum in his cup holder.

    22. Senior Member danny_16v's Avatar
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      02-14-2020 12:11 PM #146
      Quote Originally Posted by whalemingo View Post
      I grenaded my motor on my M3 right after I turbo'd it. I was going through a corner wound out in 4th gear with the motor all torqued up, shifted and hit 3rd instead of 5th. Bent a bunch of valves, screwed up the cylinder wall and a bunch of other fun stuff. Cost me a solid 5k to get it back together. Also, this was a common problem.
      If it was an E36, the commonality of the problem with most of these (other than user error) was, worn transmission mounts, worn motor mounts, worn shifter bushings.

      You may have addressed all of this, however, the situation could be made even worse once the torque level was increased on engine output by adding a turbo. Sounds like a fun way to pop the motor though! 4th - 5th means you were definitely going.
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      02-14-2020 12:33 PM #147
      Huh. I thought those were 2007 Accents.
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    24. Planters (fasciitis) peanuts. Dang dogg Sold Over Sticker's Avatar
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      02-14-2020 12:39 PM #148
      Quote Originally Posted by H.E. Pennypacker View Post
      Let me guess without reading the responses, was there gum in SoS's cup holder? I bet there was gum in his cup holder.
      Oompa loompa loopity dumb, please do not speak about my cup holder gum.
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      Quote Originally Posted by Phillie Phanatic
      SoS - please shoot a message when Brendan & His Retarded Sycophants has another gig. I’ll be there, front row.

    25. Millennial Pizza Cat's Avatar
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      02-14-2020 12:45 PM #149
      Quote Originally Posted by H.E. Pennypacker View Post
      Let me guess without reading the responses, was there gum in SoS's cup holder? I bet there was gum in his cup holder.
      I thought that was the standard operating procedure for rentals and leases.

      Please advise.
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    26. Member Jimmy Russells's Avatar
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      02-14-2020 12:51 PM #150
      What is "a gum?" Is it not, some gum, or a pack of gum?

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