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      10-26-2016, 12:07 AM   #1
johnnydad
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M2 6MT Rev Matching Experiences

Hi all - I'm driving a M135i manual and have test driven the M2 DCT both on the track and on the road so of course am plotting the acquisition of one.

I much prefer manuals, and didn't find the DCT suited me, but am a little worried about the rev-matching function as I do my own heel-toe matching almost all the time just because I like to.

Questions

1. Can the rev match be turned off while still having DSC?
2. Can the rev match be coded to not work in, say, Sport mode
3. Does it work seamlessly - as in, do you have to now get good at releasing the clutch as you change down or is that foolproof?
4. If you blip the throttle yourself, does that override the effect, or interfere with it?

I've not ever driven a car with matching, and MT test drives are very hard to come by here....
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      10-26-2016, 04:19 AM   #2
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I have a manual and thought I'd dislike the rev-match...

But... after a few months and 2800km, I am very impressed by it- to the point where I wish my other car (being a manual daily driver) had the feature. I haven't heard a complaint by a long term user yet- most complaints seem to be those who have not driven one for a period of months. Put it this way- I don't see it as a negative factor.

That said:
1. It can be coded out (there's a thread on the m4/3 forums that sets out the process).
2. You must fully deactivate DSC to get the rev match off.
3. It's seamless.
4. An accidental heel and towing after jumping between cars doesn't seem to upset it, but I think the slight throttle lag (in a turbo) may be a factor.

Perhaps an on/off button would be a good compromise for the CS/CSL?
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      10-26-2016, 06:25 AM   #3
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At what point does it actually rev match ? When you push the clutch in ? When you push the gear lever through neutral ? When the gear lever slides into the new gear ? When you let the clutch out ?
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      10-26-2016, 06:35 AM   #4
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Corinne it works when you move the lever toward the entrance of the downshift gear, as there are some sensors in place which detects lever position and automatically blips the throttle to match the car current speed.

johnnydad if you know to heel-toe then just run it in dsc mode, and car has plenty of traction anyway.
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      10-26-2016, 07:43 AM   #5
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Just watch the deceleration at a red light gioing from 3rd to 2nd gear, there is some little RPM in plus ( or throttle ) which can push you a little bit ahead with a light braking, going from 3rd at 3500rpm down to 2nd for example.
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      10-26-2016, 09:15 AM   #6
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To be honest, it's much less intrusive than you think.

As for heel-and-toe, the computer can do it a hell of a lot faster than I can...I've tried doing it while the rev match is on and I'm always behind (expected, but shows how computers can and do help sometimes).
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      10-26-2016, 11:09 AM   #7
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I am in love with the feature. It makes the car super smooth to drive slow. I really enjoy it and was skeptical about it at first. Great feature.
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      10-26-2016, 11:18 AM   #8
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Quote:
Originally Posted by RPM2-85 View Post
I am in love with the feature. It makes the car super smooth to drive slow. I really enjoy it and was skeptical about it at first. Great feature.
+1

Awesome feature and makes the car more fun to drive.

Also like the feature where the car will creep (auto rev) in 1st gear from a dead stop without giving it gas, just let out the clutch, great for driving in traffic
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      10-26-2016, 12:37 PM   #9
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Quote:
Originally Posted by Yellowflash21 View Post
it works when you move the lever toward the entrance of the downshift gear, as there are some sensors in place which detects lever position and automatically blips the throttle to match the car current speed.
So does it overrev match if you say accidentally move the lever from fifth too close to 2nd rather than 4th and have yet to actually let the clutch out?
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      10-26-2016, 12:44 PM   #10
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Quote:
Originally Posted by Yellowflash21 View Post
Corinne it works when you move the lever toward the entrance of the downshift gear, as there are some sensors in place which detects lever position and automatically blips the throttle to match the car current speed.
Ooh, that sounds like makin' whoopee. .

But it's an accurate description, Corinne. Trust me, you'll start appreciating it. I was also sceptical till I drove my car. If it would have been an optional feature, I would have taken it too.

Apart from assisting the driver when rowing through the gears, here's a major reason for BMW for equipping the M2 - targetted at a younger public - with rev-match that cannot be switched off (except when the "DSC OFF" mode is activated): it saves the driver from miss-shifting the car: if you accelerate and shift from 4th to 3rd instead of 5th, you'll immediately get that startling high rpm squeal, allowing your mind the sufficient fraction of a second *not* to release the clutch. Without rev-match you release the clutch and give your gearbox a stress-loaded time. Sooner or later you will miss-shift your M2, but won't release the clutch (happened to me as well as to experienced drivers who already drove my car - a momentarily lapse of reason, you know).

Of course, BMW should have done with the M2 as Porsche did with the Cayman GT4: install a rev-match on/off button (which Porsche misleadingly labelled "SPORT").
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      10-26-2016, 01:40 PM   #11
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Quote:
Originally Posted by Cope View Post
So does it overrev match if you say accidentally move the lever from fifth too close to 2nd rather than 4th and have yet to actually let the clutch out?
That's a damn good question.
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      10-26-2016, 02:20 PM   #12
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Quote:
Originally Posted by PackPride85 View Post
That's a damn good question.
Not really. You have to be pretty much right at the gate for it to recognize. Even downshifting 4th to 2nd, it won't recognize it needs to rev-match until you're almost ready to engage the gear.
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      10-26-2016, 03:39 PM   #13
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Every car I've owned since 1981 has been a manual. This is the first with rev-matching. My experience (only have 800 miles on it) has basically been the same as Dave-A. I like it, don't notice it kicking in much, and don't plan on coding it out.
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      10-26-2016, 07:01 PM   #14
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Quote:
Originally Posted by RAM_E90_F87 View Post
Every car I've owned since 1981 has been a manual. This is the first with rev-matching. My experience (only have 800 miles on it) has basically been the same as Dave-A. I like it, don't notice it kicking in much, and don't plan on coding it out.
This^^. Except for me 1977!
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      10-26-2016, 08:49 PM   #15
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Like many MT enthusiasts, the auto-rev match has always been the one feature of the M2 that makes me cringe. But having never experienced it first hand, I am very reassured that many of you seasoned MT drivers who have M2s have embraced this feature, and do not find it to be a nuisance.

Perhaps we just need to suck up our pride, concede that sometimes technology is more infallible than we are (sometimes, not always!), and count our blessings that we can even get the M2 with a 6MT, auto-rev match or not. I'm sure one day soon an MT will not even be available on M cars, and the debate surrounding auto-rev match will be the least of our concerns.

I for one will enjoy my M2, and cherish it as though it may be the last MT M-car I will own.
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      10-27-2016, 07:25 AM   #16
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I have a habit of always moving the gear selector back and forth once to ensure I'm in neutral, and I found that it loved to try to downshift into some gear even when I wasn't really asking it to. I coded it off on the second day.

Definitely not to say it isn't a cool piece of tech, just wasn't my bag. I absolutely love executing good downshifts. No feeling quite like it.
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      10-27-2016, 07:44 AM   #17
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Quote:
Originally Posted by nishmaster2k View Post
I have a habit of always moving the gear selector back and forth once to ensure I'm in neutral, and I found that it loved to try to downshift into some gear even when I wasn't really asking it to. I coded it off on the second day.

Definitely not to say it isn't a cool piece of tech, just wasn't my bag. I absolutely love executing good downshifts. No feeling quite like it.
Tsk tsk, that's a terrible habit....

But hey, to each their own. I haven't had any issues with the rev match.
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      10-27-2016, 08:03 AM   #18
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Quote:
Originally Posted by nishmaster2k View Post
I have a habit of always moving the gear selector back and forth once to ensure I'm in neutral, and I found that it loved to try to downshift into some gear even when I wasn't really asking it to. I coded it off on the second day.

Definitely not to say it isn't a cool piece of tech, just wasn't my bag. I absolutely love executing good downshifts. No feeling quite like it.
lol.. I do that too... hadn't thought of that. Will be interesting to see if I find it annoying or cool after so many years of "normal" manuals. My turbo Bug hangs the throttle a bit on shifts and even that little bit of intrusion irritates me.
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      10-27-2016, 08:06 AM   #19
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I love it for daily driving. I wish I could turn off the auto throttle it uses in first gear to keep the engine from stalling. That's a little annoying.
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      10-27-2016, 08:33 AM   #20
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Quote:
Originally Posted by atxsk8r View Post
Quote:
Originally Posted by RPM2-85 View Post
I am in love with the feature. It makes the car super smooth to drive slow. I really enjoy it and was skeptical about it at first. Great feature.
+1

Awesome feature and makes the car more fun to drive.

Also like the feature where the car will creep (auto rev) in 1st gear from a dead stop without giving it gas, just let out the clutch, great for driving in traffic
I never knew it did that... So you never really give it gas while letting go of the clutch in 1st?
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      10-27-2016, 08:40 AM   #21
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I have to agree with the crowd here, this feature had me concerned, but now that I have driven with it, I like it. It's subtle and it allows really smooth shifts. its probably better for the dual mass flywheel too.
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      10-27-2016, 08:47 AM   #22
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Quote:
Originally Posted by Nicname View Post
I never knew it did that... So you never really give it gas while letting go of the clutch in 1st?
No gas, just let out the clutch and it auto revs, car starts to move. Pretty weird feeling at first to get used to but its very helpful in stop and go traffic, less foot work to do.
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