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      10-31-2019, 10:08 PM   #67
chris719
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I think this is the scenario that pz619 mentioned where this does not help:

Imagine you are already at redline in 3rd gear and you shift into 2nd by accident instead of 4th. You were already at redline and at the limiter basically, so you will not hear too much of a difference when the car goes to blip the throttle to the rev limiter when you enter the gate of 2nd. In practice I am sure it depends on timing. You will hear something because your foot would normally be off the throttle at that point, but is it clear enough?
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      10-31-2019, 10:39 PM   #68
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Quote:
Originally Posted by chris719 View Post
Imagine you are already at redline in 3rd gear and you shift into 2nd by accident instead of 4th. You were already at redline and at the limiter basically
Two scenarios:
  1. you are driving in DSC OFF mode: you push the clutch pedal; you push the gear shift into 2nd gear; you hear nothing peculiar as long as you don't release the clutch; you release the clutch; bad surprise: 'The Expensive Sound' of strained mechanical parts; you curse; car gets stranded and needs repairs;
  2. you are not driving in DSC OFF mode: you push the clutch pedal; you push the gear shift into 2nd gear; you hear straightaway the cringing high-pitched wail as soon as you access/enter the 2nd gear gate (despite still pushing the clutch pedal) (rev-match triggered); as a natural reflex you curse, keep pushing the clutch pedal and pull the gear stick back to neutral position; though not particularly healthy, you just avoided 'The Expensive Sound' and can continue your drive.
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      10-31-2019, 10:54 PM   #69
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Quote:
Originally Posted by Artemis View Post
Two scenarios:
  1. you are driving in DSC OFF mode: you push the clutch pedal; you push the gear shift into 2nd gear; you hear nothing peculiar as long as you don't release the clutch; you release the clutch; bad surprise: 'The Expensive Sound' of strained mechanical parts; you curse; car gets stranded and needs repairs;
  2. you are not driving in DSC OFF mode: you push the clutch pedal; you push the gear shift into 2nd gear; you hear straightaway the cringing high-pitched wail as soon as you access/enter the 2nd gear gate (despite still pushing the clutch pedal) (rev-match triggered); as a natural reflex you curse, keep pushing the clutch pedal and pull the gear stick back to neutral position; though not particularly healthy, you just avoided 'The Expensive Sound' and can continue your drive.
Sorry Artemis, not sure I can agree on point 2 purely in a practical sense. I 100% get this if you aren’t at redline, but if you max out 3rd gear and accidentally go into second, rev matching wouldn’t trigger any audible warning. You are already at the maximum revs the computer will allow. The only way this would work is if you clutch in for so long that the revs drop enough for rev-match to be re-triggered when you slide back into 2nd. In theory I think you are correct, but in practice I don’t think anyone maxing revs in an attempt to go fast, would then shift so slowly and clumsily to create an overrev scenario.

But hey, I’ve been wrong before.
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      10-31-2019, 11:52 PM   #70
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Quote:
Originally Posted by pz619 View Post
Sorry Artemis, not sure I can agree on point 2 purely in a practical sense. I 100% get this if you aren’t at redline, but if you max out 3rd gear and accidentally go into second, rev matching wouldn’t trigger any audible warning. You are already at the maximum revs the computer will allow. The only way this would work is if you clutch in for so long that the revs drop enough for rev-match to be re-triggered when you slide back into 2nd. In theory I think you are correct, but in practice I don’t think anyone maxing revs in an attempt to go fast, would then shift so slowly and clumsily to create an overrev scenario.
But hey, I’ve been wrong before.
The proof of the pudding is in the eating. All it took was a perfectly human momentarily lapse of reason someday in the past with my M2. High rev range. 'Luckily' I was driving in SPORT mode, escaping the DSC OFF mode 'money shift' death trap + avoiding any wallet drama with quick reflexes. Yeah, I cursed hard. I don't want that pudding.
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      11-01-2019, 12:59 AM   #71
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Quote:
Originally Posted by Artemis View Post
The proof of the pudding is in the eating. All it took was a perfectly human momentarily lapse of reason someday in the past with my M2. High rev range. 'Luckily' I was driving in SPORT mode, escaping the DSC OFF mode 'money shift' death trap + avoiding any wallet drama with quick reflexes. Yeah, I cursed hard. I don't want that pudding.
I haven't tried it, so I can't comment. It might be enough for most people. It seems a bit safer to make it some scary beep, though.

It would be easy enough to prevent the stick from even engaging the gear, but I guess that costs money and adds another point of failure for how rare money shifts are.
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      11-01-2019, 08:19 AM   #72
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Quote:
Originally Posted by Artemis View Post
On the original 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.
I want to hear this WAIL. Any volunteers?
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      11-01-2019, 09:02 AM   #73
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Quote:
Originally Posted by Conissah View Post
Quote:
Originally Posted by Artemis View Post
On the original 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.
I want to hear this WAIL. Any volunteers?
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      11-01-2019, 10:42 AM   #74
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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
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      11-01-2019, 10:51 AM   #75
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Ouch! That's painful. Having learnt to drive in the UK, I did so in a manual driving my dads E46 320i.

He made me sit in the car with the engine running going up and down the gears....(at the time just 5 gears). He didn't let me drive until I could shift into the correct gear with my eyes closed, and he would never let me short-shift.

This is exactly the technique I learnt and I've never missed a year in 21 years of driving...

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

Sadly I'm now driving automatics and I don't think my 2 year old son will drive a manual when he learns to drive. It's a dying skill....
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      11-01-2019, 10:56 AM   #76
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Quote:
Originally Posted by arciga18 View Post
So op never came back ?
He gone like his engine.
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      11-01-2019, 11:16 AM   #77
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Quote:
Originally Posted by mightyfox View Post
What can i say? i was pushing the car hard and type r Honda gearboxes are known to be easy to money shift. Moral of the story, don't try to shift like a race driver in your street car it's not worth it, although i must say, the insane trail of smoke i left behind was a sight to behold .
In the end honda quoted me about 9000$ for a new engine,clutch, flywheel...etc , i refused and the car still sits at home to this day (it's been about 10 years now).

Thank you for sharing, gave me a good lol this morning.
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      11-01-2019, 11:29 AM   #78
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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
Totally forgot about that one. Read it years ago, tried it, felt awkward, but kept doing it.

It's been feeling natural for years now and shifting the 'old way' feels weird.
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      11-01-2019, 11:32 AM   #79
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First time driving stick?

I learnt to drive in a manual in the U.K. when only about 1 car in 100, maybe a 1000 was an auto.

I really don't get what he did here!
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      11-01-2019, 11:33 AM   #80
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OP here! I’ve been busy but I‘ol try to answer every question I saw.

Yes, 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.

If you guys have more specific questions such as price, current set up, etc, hit my instagram messages @M2_Skyblue. Pics of the pistons are there as well.

TLDR; car is back on the road as of August ‘19 and more mods are on now.
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      11-01-2019, 11:34 AM   #81
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Quote:
Originally Posted by pz619 View Post
Just to add a bit of additional context to your post, the reality is that spark and fuel cutoff really don’t do that much here since the damage is often mechanical in nature....
Exactly this. fuel/ignition don't come into play at all. It's simply the rear wheels driving the engine instead of the other way around.

With the super low gearing (high if you think of the wheels being the driving source), the wheels will simply spin the motor beyond its redline.

That's all there is to it.
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      11-01-2019, 11:34 AM   #82
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Quote:
Originally Posted by sq86 View Post
He gone like his engine.
Hi
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      11-01-2019, 11:37 AM   #83
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Quote:
Originally Posted by SkyDubBlue View Post
Quote:
Originally Posted by sq86 View Post
He gone like his engine.
Hi
welcome back

Glad it's back on the road although it must have been an expensive journey.
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      11-01-2019, 11:54 AM   #84
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I nearly hit the same fate a while back. I knew immediately that I hit the wrong gear though, and didn't let the clutch out. Thank god. Glad to hear the car is back on the road OP.

I'm actually curious what overrev would show up in the DME report on a Porsche though in the same situation (not OP, me) if any. I.e., no money shift -- just shifting from 4th to 3rd on accident, but not letting clutch out, and then shifting back into 5th after. I don't think the computer's rev match would rev the motor past redline, so I assume it's actually not an overrev at all. I think bouncing off the rev limiter (in gear) DOES generate something along the lines of a range 1/2/3 -- though not sure. 4/5/6 can be the risky ones.
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      11-01-2019, 12:31 PM   #85
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I will say tho, your car sounds incredible! I didn't know that engine could sound so good.
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      11-01-2019, 02:31 PM   #86
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Upgrade your shifter to a cae
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      11-01-2019, 02:42 PM   #87
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it's also a good idea to double declutch when downshifting. With the gear selector in neutral on the way for example from 4th to 3rd, while passing neutral lift up on the clutch and then immediately declutch and complete the shift.

Two things happen - you slow down the spinning components of the clutch and u give yourself an extra moments to sense the gear selector is in the right plane.

On older crash box style transmissions you'd have to do the double declutch.

Since it's done under braking your minimizing a time loss when going for a quick lap for example.
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      11-01-2019, 02:50 PM   #88
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I remember my first manual lol
I remember when i first got my drivers license.

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