[3tekcorps]

Ok, maybe a bit of an exaggeration.

This is for the 6mt only. No idea what the DCT cars are like.

For anyone having trouble getting clean aggressive upshifts, here's my take on it. I know a few of you have run into this as well. For me, the enjoyment of driving a manual is executing precise up/down shifts with perfect rev-matching.

I've been bothered by the lurching upshifts I'm having mainly in 1st -> 2nd -> 3rd. I thought I was just out of practice as it's been a few years. The only way I can get smooth upshifts in the lower gears is to shift at lower RPM or WAIT for the engine speed to drop enough.

Yesterday I notice that the RPM hang and fall so slow at times the engine RPM is off maybe 1500 when you drop the clutch. In 2nd the speeds aren't in synch at all and you get big lurch from the car as the engine is RMP immediately reduced by 1500 RPM by the drivetrain.

Just take first to about 6000 and then grab second and watch the tach when you drop the clutch. Unless i'm just messing things up the car will lurch when the clutch is dropped, unless you wait for the RPM to fall enough.

I'm guessing the slow deceleration is an emission requirement. Is it the same in all settings? Didn't someone mention rev-matching in upshifts somewhere?

[AlpsRider]

Maybe it's my imagination, but Sport+ seems to allow the rpm to drop faster allowing smoother shifts.

[BlkSVT]

Originally Posted by AlpsRider

Maybe it's my imagination, but Sport+ seems to allow the rpm to drop faster allowing smoother shifts.

^^^^^^ Agreed. I've only driven mine for ~400 miles whenever weather cooperates, but I can't say I have much to complain about as far as rev hang between shifts in Sport+. I've driven MUCH worse. I was seriously concerned about it from what I'd read here, but very pleased so far that I went w/MT

Economy, or whatever the F it's called, is a pain in the ass to drive in almost every dimension I can think of. Just all wrong for MT as far as I'm concerned. And yeah, I've driven MT almost exclusively from 15 YO permit-years until a few years ago. I can't drive the thing smoothly in Economy. Or maybe it's because I don't want to try. The car seems to fight me no matter what I want to do unless it's just a 6th gear straight cruise. F U Economy mode!

[tokki]

I agree its tricky to get right, but you CAN get it. Even the first 500 kms were a bit hit or miss for me but after a while the 1st to 2nd shift can be very smooth. You need to cushion the transmission jerk with the clutch a little more. You'll get it.

[supersam]

Originally Posted by tokki

I agree its tricky to get right, but you CAN get it. Even the first 500 kms were a bit hit or miss for me but after a while the 1st to 2nd shift can be very smooth. You need to cushion the transmission jerk with the clutch a little more. You'll get it.

This. A hair more slip at slower speeds

[grinch]

I find the M2C 6MT better and softer than the M2 N55 6MT

[3tekcorps]

Originally Posted by AlpsRider

Maybe it's my imagination, but Sport+ seems to allow the rpm to drop faster allowing smoother shifts.

I'll try that.. I almost always drive in Sport, but hate that bucking when trying to grab 2nd fast.

[3tekcorps]

Originally Posted by supersam

This. A hair more slip at slower speeds

Seems like the wrong solution. Feathering the clutch on an upshift from 2nd to 3rd??

[COChris]

I have found the 1-2 upshift to be the most sensitive. For a smoother engagement, try releasing the last 1/10th of clutch travel more slowly for a fraction of a second.

[ryem3]

Had a manual 2017. I went with a DCT for the competition. It was definitely the right decision. Sure, manual is nice, but the bmw manual is no award winner. First to second was almost always rough, no matter what, and I've driven manuals over 20 years.

[5.M0NSTER]

Nope, don't agree at all.

With this kind of car don't look for "baby smooth" shifts. Just rip them. It's hard to get a silk smooth 1-2 shift in the base M2 as well. But try a no-lift-upshift and the car loves it. The clutch might not, but we did not buy these cars to drive like grandmas.

What I'm saying is forget baby smooth and drive like like you stole it! Why? Because Rececar!!

[tokki]

Originally Posted by 3tekcorps

Seems like the wrong solution. Feathering the clutch on an upshift from 2nd to 3rd??

Its not so much slipping the clutch as it is prodding the clutch pedal slightly at the end of the shift just to cushion the gear change. 2nd to 3rd sometimes needs it if you want it butter smooth but 1st to 2nd really requires this technique. 3rd to 4th and beyond you can pretty much just dump the clutch pedal post gear change and it will still be smooth.

Originally Posted by 5.M0NSTER

Nope, don't agree at all.

With this kind of car don't look for "baby smooth" shifts. Just rip them. It's hard to get a silk smooth 1-2 shift in the base M2 as well. But try a no-lift-upshift and the car loves it. The clutch might not, but we did not buy these cars to drive like grandmas.

What I'm saying is forget baby smooth and drive like like you stole it! Why? Because Rececar!!

Uhh yeah.. These are street cars man, 99% of the time people are just commuting while having a little fun on the way.

[chmura]

OP I have the same issue. It is very annoying. I believe our cars have the clutch delay valve in our slave cylinder. There is a little restriction valve in the slave cylinder that needs to be drilled out. I am thinking of buying a new slave cylinder at the dealer and seeing if this is true. Then I would modify it and simple replace and keep the oem original.

I have the same issue. When I try to shift at 6000 rpm at WOT and change gears power drops significantly and takes .5 second to return. Very very annoying.

This cannot be turbo lag. I drove many M3 and M4 DCT’s and have shifted many times at 6000 rpm in WOT situations and there was absolutely no lag. This has to be a CDV issue in our clutch slave cylinder.

Here is some posts about it. Supposedly our cars have the same salve cylinder.

https://f87.bimmerpost.com/forums/sh....php?t=1307393

https://f30.bimmerpost.com/forums/sh....php?t=1486773

[Project_F87]

Originally Posted by chmura

OP I have the same issue. It is very annoying. I believe our cars have the clutch delay valve in our slave cylinder. There is a little restriction valve in the slave cylinder that needs to be drilled out. I am thinking of buying a new slave cylinder at the dealer and seeing if this is true. Then I would modify it and simple replace and keep the oem original.

I have the same issue. When I try to shift at 6000 rpm at WOT and change gears power drops significantly and takes .5 second to return. Very very annoying.

Here is some posts about it. Supposedly our cars have the same salve cylinder.

https://f87.bimmerpost.com/forums/sh....php?t=1307393

https://f30.bimmerpost.com/forums/sh....php?t=1486773

Our cars do not have the restriction valve. You can see if you do some digging in the car assembly.

Oh and in that first link you posted, many people on there say it doesn't have it as well lol

[chmura]

Originally Posted by alaing51

Our cars do not have the restriction valve. You can see if you do some digging in the car assembly.

Oh and in that first link you posted, many people on there say it doesn't have it as well lol

I’m not sure about that. You cannot see it because it’s a different type. It’s not external valve but an internal piece that is inside at the end of the slave cylinder that needs to be drilled out. That’s why you can’t see it. You need to remove the slave cylinder in order to see it.

Read post 31 in this thread for the DIY. Supposedly we have the same thing in ours.

After he modified and removed the CDV device it fixed all his hesitation issues.

https://f30.bimmerpost.com/forums/sh...1486773&page=2

[chris719]

Originally Posted by chmura

I’m not sure about that. You cannot see it because it’s a different type. It’s not external valve but an internal piece that is inside at the end of the slave cylinder that needs to be drilled out. That’s why you can’t see it. You need to remove the slave cylinder in order to see it.

Read post 31 in this thread for the DIY. Supposedly we have the same thing in ours.

After he modified and removed the CDV device it fixed all his hesitation issues.

https://f30.bimmerpost.com/forums/sh...1486773&page=2

I drove 12k miles before CDV removal in my Z4M so I had quite a bit of history with it both in and out.

The big difference was in modulating the clutch from a dead stop and in reverse. You could be even more smooth without slight delay in action, which isn't really even noticeable until you drove the car without the valve.

I actually did not notice any real improvement in shift quality overall. It was a mod I would definitely recommend on that car, but it's not going to fix a jerky 1->2 shift IMO. Some owners said it did, but I disagree, I think it's placebo.

With the CDV being integral on the M2, I'm not sure it's worth the effort if it behaves the same as the E46 and Z4M CDVs.

[warrenw]

I thought the M2C doesn't have a CDV?

Anyways, I pretty much have to drive in Sport+ for this reason... Hard to drive the car in economy or whatever because of it. Car is much more responsive in general in sport+.

[chris719]

Originally Posted by warrenw

I thought the M2C doesn't have a CDV?

Anyways, I pretty much have to drive in Sport+ for this reason... Hard to drive the car in economy or whatever because of it. Car is much more responsive in general in sport+.

The CDV is inside the slave cylinder in the F8x cars, apparently.

Kind of a shame that you have to use Sport+ all the time. On the OG M2 I drove I thought that the throttle map was stupidly aggressive on Sport+.

[Project_F87]

Originally Posted by chmura

I’m not sure about that. You cannot see it because it’s a different type. It’s not external valve but an internal piece that is inside at the end of the slave cylinder that needs to be drilled out. That’s why you can’t see it. You need to remove the slave cylinder in order to see it.

Read post 31 in this thread for the DIY. Supposedly we have the same thing in ours.

After he modified and removed the CDV device it fixed all his hesitation issues.

https://f30.bimmerpost.com/forums/sh...1486773&page=2

Originally Posted by chris719

I drove 12k miles before CDV removal in my Z4M so I had quite a bit of history with it both in and out.

The big difference was in modulating the clutch from a dead stop and in reverse. You could be even more smooth without slight delay in action, which isn't really even noticeable until you drove the car without the valve.

I actually did not notice any real improvement in shift quality overall. It was a mod I would definitely recommend on that car, but it's not going to fix a jerky 1->2 shift IMO. Some owners said it did, but I disagree, I think it's placebo.

With the CDV being integral on the M2, I'm not sure it's worth the effort if it behaves the same as the E46 and Z4M CDVs.

The M2 does not have the CDV

[chmura]

Originally Posted by alaing51

The M2 does not have the CDV

Post 5 in the link I showed states otherwise. Unless you can show me hard evidence the M2c does not. I still believe the M2 does have a CDV.

[SoCal_M2]

I installed the short clutch throw kit. That took away the long dead feel and springy nature of the clutch pedal. It’s amazing how much smoother the car reacts now in gear changes.

[supersam]

Originally Posted by SoCal_M2

I installed the short clutch throw kit. That took away the long dead feel and springy nature of the clutch pedal. It’s amazing how much smoother the car reacts now in gear changes.

Uuc, rogue, or shifteck? Have any pics of how the shifter sits now?