[makrop]

I'm currently still in the 1st week of waiting after placing my order on a new M240i, and been reading up as much as I can on the car. I'm wondering how this rev-matching feature behaves. How does the car know if you are going to downshift? I found something where if you're in 3rd and going to 2nd, it will blip the throttle as soon as you move the shifter to the left. What I'm curious about is what about going from 4th to 5th just as part of normal driving (shift around 3k or so). Does it ever get confused and think you are downshifting to 3rd and blip the throttle?

[oldschoolswish]

Also waiting on my manual m240i. From what I've read it happens when you start to push into the gear so it does have correct info available and it happens quite quickly. I experienced this myself briefly testing a manual 340i, it was rather pleasant. Can't wait to experience it in my own car.

[makrop]

Originally Posted by uppermanagmnt

Also waiting on my manual m240i. From what I've read it happens when you start to push into the gear so it does have correct info available and it happens quite quickly. I experienced this myself briefly testing a manual 340i, it was rather pleasant. Can't wait to experience it in my own car.

I see. So you just have to trust that its going to work properly in the split second before engaging the clutch? If that's the case, seems like you could still preemptively blip the throttle yourself, then the car would essentially correct if necessary? There weren't any manuals in my entire local dealership. All I've driven for the past 10 years have been manual BMW's though so no need to test ha.

[keylime503]

I have a 6MT M240i. The revmatching feature works shockingly well. I don't know how else to describe it other than "it just works.... flawlessly.... all the time".

As others have alluded to, the sensors are in each gate which is how the system knows if you are going say 5th->4th vs. 5th->3rd. You can blip the throttle yourself as long as you do it before entering the gate of the new gear.

[MrOhnoez]

Right from dealerspeed just for you!

“Rev matching” is BMW’s new term for this function; we have included it in all of our automatic and double-clutch 1 transmissions for some time. Now, BMW M has added the feature to its manual transmissions. As the driver moves the shift lever (again as an example) from 4th to 3rd, the electronic engine-management system brings up the engine speed and holds it as the driver engages 3rd. As far as smoothness is concerned, the result is essentially as with traditional double-clutching, but the driver doesn’t have to bring so much skill to the process (the shift "pause" in neutral can be eliminated allowing for extremely fast and smooth down shifts). Finally, as a nod to tradition, if the Sport+ mode has been selected, the rev-matching function is de-activated and the skillful driver can still practice his or her skill.



Though we chose the 4-3 shift for the explanation, all this applies to any downshift: 6th to 5th, 5th to 4th, 2nd to 1st, also if gears are jumped, etc. BMW’s rev matching also functions on upshifts (such as 2nd to 3rd, etc.). The engine speed is reduced to match the optimum speed for the higher gear selected resulting in optimized upshifts in all driving situations.

[makrop]

Originally Posted by MrOhnoez

...The engine speed is reduced to match the optimum speed for the higher gear selected resulting in optimized upshifts in all driving situations.

Sooo when upshifting, do you just not give it any gas until its in gear? I'm sure its way less intrusive than I'm imagining. Just having a hard time wrapping my head around what all it is doing.

Basically, do I need to alter my shifting to be able to drive this thing smoothly? Obviously no more need to heel-toe, but other than that???

[MrOhnoez]

Originally Posted by makrop

Sooo when upshifting, do you just not give it any gas until its in gear? I'm sure its way less intrusive than I'm imagining. Just having a hard time wrapping my head around what all it is doing.

Basically, do I need to alter my shifting to be able to drive this thing smoothly? Obviously no more need to heel-toe, but other than that???

I've never given a car gas when up shifting unless it has a light flywheel.
Clutch in, into neutral, off power, into gear clutch out, back on power.
But I drive a 72 HP beetle manual. so...I got time between shifts

[makrop]

Originally Posted by MrOhnoez

I've never given a car gas when up shifting unless it has a light flywheel.
Clutch in, into neutral, off power, into gear clutch out, back on power.
But I drive a 72 HP beetle manual. so...I got time between shifts

Yeah I guess its kind of all happening simultaneously. I made it sound like it takes me 3 seconds to shift lol. I will have to just wait and try it all out on my own. Wait is killing me and it's only been 4 days since I sold my 135i

[CP911]

A few threads worth reading:

http://www.2addicts.com/forums/showthread.php?t=1338339

https://f87.bimmerpost.com/forums/sh....php?t=1471482

I had my m240i out again yesterday and the only time it consistently auto-blips is when doing a sequential downshift from any gear i.e. 4th >> 3rd or 6th >> 5th.

I believe I also caught it rev matching when I was doing a neutral roll and then went right back into 5th gear to continue cruising. However, when I did a neutral roll and wanted to go into 2nd as I was approaching a stop sign, it did not auto-blip when I was expecting it to and I got some head jerk as a result.

Seems there is still some sort of inconsistency or bug/software update that is causing the unpredictable auto-blipping. Very annoying. I hope BMW gets this fixed soon with a software update. For now, I'm going to have to call my local BMW service department and see if they have any insight.

The pedal positioning in the F22 platform is superb, so heel and toe is much easier than I experienced with my 2007 Carrera S or 2016 WRX. Almost wish I could code it out completely at this point until BMW resolves the inconsistency. I found myself wanting to heel and toe anyhow...

[stein_325i]

Don't know if anyone has replied with this yet, but if you don't like the rev matching, i believe whenever its in sport + (just sport without traction control), it disables the auto rev match.

I believe it also does this whenever the traction control is off (doesn't matter which drive mode) but i am not completely sure about this one.

[keylime503]

Originally Posted by joshuastein55

Don't know if anyone has replied with this yet, but if you don't like the rev matching, i believe whenever its in sport + (just sport without traction control), it disables the auto rev match.

I believe it also does this whenever the traction control is off (doesn't matter which drive mode) but i am not completely sure about this one.

Sport+ alone does not turn off rev matching. I drive Sport+ on the way to work in the morning and there absolutely is still rev matching.

[aerobod]

DSC off turns off rev matching on our M240i.

[makrop]

Originally Posted by CP911

...However, when I did a neutral roll and wanted to go into 2nd as I was approaching a stop sign, it did not auto-blip when I was expecting it to and I got some head jerk as a result.

Seems there is still some sort of inconsistency or bug/software update that is causing the unpredictable auto-blipping. Very annoying. I hope BMW gets this fixed soon with a software update. For now, I'm going to have to call my local BMW service department and see if they have any insight...

This is exactly what I'm skeptical about...

[Weeknd]

is there REV matching on the m235i also?
can someone explain properly REV matching ??

[makrop]

CP911 Those posts just made me even less excited for rev-matching... dang it. Ha. What happens if you just blip the throttle or heel-toe on your own, even with rev-matching on? If the computer's purpose is to match the revs, would it either ignore your manual input, or cancel the auto input, or some combination of both?

[aerobod]

Computer adjusts the revs dependent on your input, so full throttle blipping can be done, it just adjusts the revs to match the road speed after you have blipped, as you will blip the throttle before fully leaving the previous gear, it will only adjust going into the next gear.

[VPB74]

On my 2018 M240i, I only seem to get rev matching on my first downshift. For example, if I'm going from 6th to 5th it will rev match, but then when I downshift from 5th to 4th it doesn't. I think others have experienced this as well; anyone else see this? Seems like you should either have rev matching for all downshifts or none at all.

[mecodoug]

my M240 rev matches on all downshifts except when I engage the clutch, shift down 1 and shift down 2 before releasing the clutch. It also has some kind of time delay that if you exceed it wont rev match. But quick downshifts are always matched.

I've really grown to like it.

[mike519]

Originally Posted by makrop

Sooo when upshifting, do you just not give it any gas until its in gear? I'm sure its way less intrusive than I'm imagining. Just having a hard time wrapping my head around what all it is doing.

Basically, do I need to alter my shifting to be able to drive this thing smoothly? Obviously no more need to heel-toe, but other than that???

So, I've re-read the whole thread in case I am seriously missing something but I don't see where I could have. You mention "upshifting"...you do realize that rev-matching is only for downshifting right? I'm sure you do and maybe just misspoke when you said upshifting but thought I would clarify just in case.

[makrop]

Originally Posted by mike519

So, I've re-read the whole thread in case I am seriously missing something but I don't see where I could have. You mention "upshifting"...you do realize that rev-matching is only for downshifting right? I'm sure you do and maybe just misspoke when you said upshifting but thought I would clarify just in case.

I was responding to the post above that said the car also adjusts rpms for upshifts too (if needed).

[mike519]

Originally Posted by makrop

I was responding to the post above that said the car also adjusts rpms for upshifts too (if needed).

Ah, sorry, yes indeed, I missed that last paragraph in that post.

I can't imagine why in hell you would want rev matching on upshifts. I assume the goal is to hold rpms at an optimal point for the next gear but wholly heck, if someone upshifts so slow as to allow the rpms to drop down enough for it to be even a tiny issue in going to the next gear, they should not be driving a manual!

Guess I will be driving with DSC off a lot!