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      03-16-2015, 01:15 PM   #1
Accel Junky
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Money Shift(s) at track...

First, a positive note: The M Lap Timer app kicks ass! What a useful tool with telemetry data and the ability to scroll your way through the laps to find events.

Note: 6MT F80

On to my issue... I knew of one money shift at my track day yesterday. I was coming in hot 120mph on the front straight at Atlanta Motorsports Park. This was the fastest speed of the day for me. I had been shifting by ear the entire day and truthfully it was a bit hard to hear my stock exhaust over the wind noise with the windows down and the general sounds of the track. That time I saw as I was in the braking zone and downshifting that I had gone into 2nd far too early in the braking process and watched the needle go deep into the red.

Fast forward and I looked back at my telemetry data for the day and found 2 more over-revs that apparently I did not notice. Both in the same place...the end of the front straight.

The car is not making any noise nor is it behaving any differently as far as I could tell. Whether it was wise or not I continued the last 2 sessions after the one money shift I was aware of and my lap times remained within a half second or less range of my best laps for the day. So by that evidence, I have to believe my engine is OK...but I just can't imagine the motor taking an extra 800rpms without detriment.

Here's the telemetry data at the moment of the 3 over-revs: (8427rpm is the highest of the 3)
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Last edited by Accel Junky; 03-16-2015 at 01:28 PM..
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      03-16-2015, 01:16 PM   #2
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6MT or DCT?
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      03-16-2015, 01:24 PM   #3
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Quote:
Originally Posted by SMURFDADDY View Post
6MT or DCT?
6MT. Clutch out, full deal. Sorry Photobucket is apparently down so my screenshots didn't work. Attached them instead.
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      03-16-2015, 01:24 PM   #4
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Quote:
Originally Posted by SMURFDADDY View Post
6MT or DCT?
DCT does not downshift to redline...
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      03-16-2015, 01:27 PM   #5
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You may wanna remove this thread in case you need to file a warranty claim at any point... just a thought.
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      03-16-2015, 01:27 PM   #6
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Originally Posted by M6-Coupe View Post
DCT does not downshift to redline...
Thats what I figured, just wanted to confirm as this would be a fucking disaster I dont want to find out the hard way
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      03-16-2015, 01:28 PM   #7
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Yikes, I saw the thread title and who made it, and all I thought was "shit." Its iffy man, lets hope that no damage was done; BMW FSE's can pull all of the over-revs and they may decline a warranty repair due to them...
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      03-16-2015, 01:38 PM   #8
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Quote:
Originally Posted by chris s View Post
You may wanna remove this thread in case you need to file a warranty claim at any point... just a thought.
I have to assume they will see the over rev by doing a computer scan so I'm not sure that I'm saving myself any trouble. Probably screwed either way if a problem develops.
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      03-16-2015, 01:39 PM   #9
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Can a tech go through the ECU and delete the Over REV data?
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      03-16-2015, 01:40 PM   #10
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Quote:
Originally Posted by Accel Junky View Post
I have to assume they will see the over rev by doing a computer scan so I'm not sure that I'm saving myself any trouble. Probably screwed either way if a problem develops.
Was your auto blip on? Or were you driving in sport+?
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      03-16-2015, 01:41 PM   #11
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Whoa! That 8247! At least it was in the braking zone, and not under acceleration.
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      03-16-2015, 01:44 PM   #12
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Quote:
Originally Posted by rr006rbc View Post
Was your auto blip on? Or were you driving in sport+?
Yeah, I was in MDM with Efficient throttle so rev match was on.

Quote:
Originally Posted by M Drei Fahrer View Post
Whoa! That 8247! At least it was in the braking zone, and not under acceleration.
That is true, throttle off completely and braking rapidly but it felt like slow motion when I saw that one overrev that I witnessed.
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      03-16-2015, 01:45 PM   #13
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On the bright side, if it works, we now know it can rev like an S65...

Just kidding man, hope it all works out and nothing happened.
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      03-16-2015, 01:50 PM   #14
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[QUOTE=Accel Junky;17573203]Yeah, I was in MDM with Efficient throttle so rev match was on.
QUOTE]

How is that on the track? I've always had Japanese manual cars when I drive on the track and it's a WHOLE lot easier heel-toeing when the accelerator pedal pivots from the top of the pedal assembly rather than the way our German cars are set up pivoting from the bottom. So when my F80 6-spd arrives it's gonna take some getting used to I'm sure but hopefully the auto rev match feature works great? I guess we'll see.
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      03-16-2015, 01:55 PM   #15
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Quote:
Originally Posted by M Drei Fahrer View Post
Whoa! That 8247! At least it was in the braking zone, and not under acceleration.
How would one hit 8200+RPM under acceleration?

Engaging the wrong gear would be the only way IMO.
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      03-16-2015, 01:59 PM   #16
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Quote:
Originally Posted by CanAutM3
Quote:
Originally Posted by M Drei Fahrer View Post
Whoa! That 8247! At least it was in the braking zone, and not under acceleration.
How would one hit 8200+RPM under acceleration?
no lift shifting?
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      03-16-2015, 02:06 PM   #17
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First note, this is not a Money Shift (at least not yet). It is simply an over-rev. Your car is still running fine, isn't it ?

Second, I suspect you are doing the same mistake I see many students do. You probably are trying to get rid of the shift in a haste too early in the braking zone. I also had the same problem in my early years. I was so stressed out, barreling down the straight towards a corner, thinking I had to downshift and heel-and-toe that I just wanted to get rid of the downshift as fast as I could so I could focus on braking and hitting my entry point. Until someone pointed out the obvious to me, and it became a revelation: Focus on braking first. Bring your speed down and then you have all the time in world to do your downshift as you are approaching the corner at a lower speed . Further, the lower the road speed, the less rev increase is needed to go in the next gear, so the heel-and-toe is also faster and easier to execute.

While with auto-rev-match you don't need to worry about heel-and-toeing, I would still recommend that you wait as late as possible in the braking zone to complete your downshift.
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      03-16-2015, 02:07 PM   #18
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Quote:
Originally Posted by rr006rbc View Post
How is that on the track? I've always had Japanese manual cars when I drive on the track and it's a WHOLE lot easier heel-toeing when the accelerator pedal pivots from the top of the pedal assembly rather than the way our German cars are set up pivoting from the bottom. So when my F80 6-spd arrives it's gonna take some getting used to I'm sure but hopefully the auto rev match feature works great? I guess we'll see.
The auto rev match worked very well. I have a feeling my passengers thought I was an experienced track rat or something

MDM on the other hand was very intrusive accelerating out of turns. Lagged for days before I got my full acceleration back. BUT DSC off was just too much for me to risk after I tried it for half of a lap. So MDM stayed on the whole time. I think it did its job well of letting me go balls deep without much worry.
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      03-16-2015, 02:08 PM   #19
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Quote:
Originally Posted by ASAP View Post
no lift shifting?
Isn't there a cutoff at 7600RPM?

Unless the engine is mechanically driven, I don't see how it (over-rev) could be done with the throttle only...
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      03-16-2015, 02:12 PM   #20
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Quote:
Originally Posted by CanAutM3 View Post
Isn't there a cutoff at 7600RPM?

Unless the engine is mechanically driven, I don't see how it could be done (over-rev) with the throttle only...
Please correct me if I am wrong but I thought the cutoff only works one way... in other words, in gear, revving - up. If you are in say 4th and downshift to 3rd while keeping your foot planted on the gas pedal and quickly shift whilst banging the clutch, then release, I think it would allow you to.

OP, check if there is any oil loss or if anything is wet.
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      03-16-2015, 02:13 PM   #21
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Quote:
Originally Posted by CanAutM3
Quote:
Originally Posted by ASAP View Post
no lift shifting?
Isn't there a cutoff at 7600RPM?

Unless the engine is mechanically driven, I don't see how it (over-rev) could be done with the throttle only...
With a stick shift it is 100% possible. It's still mechanical when you throw it into a gate that'll cause it to overrev
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      03-16-2015, 02:14 PM   #22
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Quote:
Originally Posted by rr006rbc View Post
I've always had Japanese manual cars when I drive on the track and it's a WHOLE lot easier heel-toeing when the accelerator pedal pivots from the top of the pedal assembly rather than the way our German cars are set up pivoting from the bottom. So when my F80 6-spd arrives it's gonna take some getting used to I'm sure but hopefully the auto rev match feature works great? I guess we'll see.
Interesting, because I find it is the other way around. I prefer bottom hinged throttle pedals. And not all German cars are bottom hinged. My VW GTis from my early time attack years were top hinged and so is my wife's Audi S4.
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