A question about the new rev-matched 6MT

[absoluteis350]

Has anyone driven one of the 4 series MTs with rev matching on downshifts? I know the system is disabled on sport+ mode, but if you drive it in the other modes, and attempt to rev match on downshift by habit, what does the system do ? It would seem that if you underrev, the system will just blip the throttle to get to the correct revs, but what happens if you over rev ? I assume the system senses that and doesn't blip the throttle more? Obviously this assumes you aren't great at rev matching.

[Black Gold]

I don't think it is on the regular 4 series

I have driven the system in the 370z and it works extremely well. Basically what it does is you shift into a certain gear and the car automatically revs to the appropriate RPM. once you get used to it it is very quick and intuitive

[F82_SID]

Be aware that the latest info says that this rev matching function will only work in Comfort or sport mode, not sport+.

From interview: http://f80.bimmerpost.com/forums/sho...d.php?t=934947

So dont let your skills slip because you will still need them at the track! ;-)

[absoluteis350]

Originally Posted by KennyPowers

I don't think it is on the regular 4 series

I have driven the system in the 370z and it works extremely well. Basically what it does is you shift into a certain gear and the car automatically revs to the appropriate RPM. once you get used to it it is very quick and intuitive

Yea the question I have is what the system does if you try to manually rev match but don't do it successfully (while the system is engaged).

[CanAutM3]

Originally Posted by absoluteis350

Yea the question I have is what the system does if you try to manually rev match but don't do it successfully (while the system is engaged).

I was asking myself the same question.

Rev matching and heel-and-toeing has become a second nature and a reflex. I do it without even thinking about it. I would need to retrain myself to not to touch the throttle .

I think it would have been preferable for BWW to have put a seperate switch for that function instead of limting its application to the selected driving mode.

[uhn2000]

Just from experience if the engine lag is there it will be very hard to heal toe in the M3. The lag is really apparent on the V8TT M5 engine when you are driving it in MT. The only way to get a really good rev match is for the system to do it or you can really experiment with sport+ setting and nail it at times.

One thing that I don't like is how the rev match is only on the Sport and not Sport+ setting. There is a noticeable difference in throttle response between the settings.

[solstice]

Originally Posted by uhn2000

One thing that I don't like is how the rev match is only on the Sport and not Sport+ setting. There is a noticeable difference in throttle response between the settings.

This should be even more noticeable since the anti-lag system is only active in Sport+. Maybe you touched on the reason, with anti-lag the need for an auto rev. match is diminished due to a much quicker response and easier heel-toe scenario?

[uhn2000]

Originally Posted by solstice

This should be even more noticeable since the anti-lag system is only active in Sport+. Maybe you touched on the reason, with anti-lag the need for an auto rev. match is diminished due to a much quicker response and easier heel-toe scenario?

Good point, I will say that after careful thought and comparison to a 997.2 6MT the M5 6MT is actually pretty decent the main issue is the engine response, its so sensitive and brutal that heal toe refinement is hard. I have a UCC short shifter going in next week and hoping that will add to the engagement. I am very interested in the M3 just don't know if I could go down in space considering the comfy space of the F10 - going to take it for a drive as soon as a I can to see for myself

[mntbiker]

Originally Posted by KennyPowers

I don't think it is on the regular 4 series

Yea, it's not available on the manual 435i. At least, I've never noticed it working... so, if it is there, it's imperceivable.

[Sedan_Clan]

I'm glad this 'aid' can be disengaged. I imagine that it would feel unnatural to those of us who are used to rev matching on our own. Our natural movement/muscle patterns already take care of the 'rev matching' for us.

[signes]

^^^Disengaged only in sport plus, which in the E9x is hyper sensitive.

[ixse]

Originally Posted by uhn2000

Just from experience if the engine lag is there it will be very hard to heal toe in the M3. The lag is really apparent on the V8TT M5 engine when you are driving it in MT. The only way to get a really good rev match is for the system to do it or you can really experiment with sport+ setting and nail it at times.

One thing that I don't like is how the rev match is only on the Sport and not Sport+ setting. There is a noticeable difference in throttle response between the settings.

lol wth you talking about. i had no problen rev matching in my evo, and if you wanna talk about turbo lag, evo is a lot worse than f10.
you adjust rpm while clutch is in, so effect of laggy engine really dont matter. you almost sound like you need more practice

[Sedan_Clan]

Originally Posted by signes

^^^Disengaged only in sport plus, which in the E9x is hyper sensitive.

I understand that, and Sport+ is only hyper sensitive the first few times you drive in that mode. Like anything else, you adjust. I drove in Sport+ 100% of the time.

[signes]

Adjust yes, but still too jumpy. I liked it for rev matching since the throttle pedal travel needed to be less and matched better with city driving where you aren't braking as hard. I prefer sport for everything else, including the track.

[Sedan_Clan]

Originally Posted by signes

Adjust yes, but still too jumpy. I liked it for rev matching since the throttle pedal travel needed to be less and matched better with city driving where you aren't braking as hard. I prefer sport for everything else, including the track.

That's a subjective opinion, but many do share your sentiment. I only felt that way for a day or so. Once I adjusted to it, it didn't feel jumpy at all. Even when I drive my 335i in ECO-PRO for a long period of time and then change to Sport/Sport+, the results are reminiscent of my previous M3's (..initially touchy, but you adjust in short time).

[mkoesel]

I'll bet there will be a solution to code this out if desired. But probably not a way to turn it on and off at will, at least not soon.

[uhn2000]

Originally Posted by ixse

lol wth you talking about. i had no problen rev matching in my evo, and if you wanna talk about turbo lag, evo is a lot worse than f10.
you adjust rpm while clutch is in, so effect of laggy engine really dont matter. you almost sound like you need more practice

Yes sorry more practice, I guess all my MT rides: 3x911s, 135i, M5V10, 530, and 3 other Hondas coupled with 2xRacing Bikes that I tracked in almost 10+ times a year did not do enough. Happy to have you come and drive my car to show me how to perfectly H/T each time in this beastly engine!

And yes you may just be a manual driver

[goldminer]

I have read that the new 6MT will have a rev-matching feature similar to that seen on the manuals in the 370Z and new vette. (It isn't there in sport+ mode but is in normal and sport.)

I am not very thrilled about this as I love doing rev-matched, double-clutched down shifts on my own in my M3. I use this method all of the time.

My question is how does this system actually work? If I just shift down presumably it will rev match. But what if I double clutch? When will it rev up? On shifting into neutral and letting the clutch out? Will it rev twice when I put the clutch back in to shift to the lower gear? Will I just confuse it by double clutching?

Also, anyone know if this can be disabled through coding?

[Sedan_Clan]

There are too many unknowns, but I definitely will be in Sport+ 100% of the time. I can do my own rev matching.

[hwelvaar]

Originally Posted by goldminer

I have read that the new 6MT will have a rev-matching feature similar to that seen on the manuals in the 370Z and new vette. (It isn't there in sport+ mode but is in normal and sport.)

I am not very thrilled about this as I love doing rev-matched, double-clutched down shifts on my own in my M3. I use this method all of the time.

My question is how does this system actually work? If I just shift down presumably it will rev match. But what if I double clutch? When will it rev up? On shifting into neutral and letting the clutch out? Will it rev twice when I put the clutch back in to shift to the lower gear? Will I just confuse it by double clutching?

Also, anyone know if this can be disabled through coding?

What exactly is the idea behind double clutching?

Why would it rev match when shifting into neutral? That doesn't make any sense.
To what would the system then match any revs anyway?

[E36toF30]

I think it's a good feature to have (I would use it sometimes), but they should really have a separate toggle for it. Enabling in certain driving modes and not others (no user configuration) is a very poor design choice I think. At least in the E9x M3 they had separate toggles for other stuff. I don't understand why they don't just add one for rev matching.

[hwelvaar]

Found this on Wikipedia. So how does this relate to M3/M4?

Double clutching (also called double declutching) is a method of shifting gears used primarily for vehicles with a unsynchronized manual transmission, such as commercial trucks and specialty vehicles