[FunnyUsername]

Not sure if this is typical, but I noticed that even when the car is fully warm, shifting with the paddles has maybe 0.3 to 0.4 seconds of lag before the computer accepts the input and actually starts the shift.

Would the break in period have limiters causing this?

If not, is there a way to increase the shift responsiveness? Perhaps some kind of setting or xHP tune?

[Jonesymx29]

If you're in eco-pro or comfort, the shifts are lazy. Especially in Eco pro.

If you're in sport, they'll be quickish. Sport plus is pretty quick. Not DCT quick, but in the same relative zone.

[FunnyUsername]

Originally Posted by Jonesymx29

If you're in eco-pro or comfort, the shifts are lazy. Especially in Eco pro.

If you're in sport, they'll be quickish. Sport plus is pretty quick. Not DCT quick, but in the same relative zone.

I was in sport+ with sport transmission. The lag is pretty obvious

[viperx100]

Originally Posted by FunnyUsername

I was in sport+ with sport transmission. The lag is pretty obvious

That's strange. My M240i definitely doesn't exhibit lag that you are describing in Sport+. Unless you are coming from a PDK, I can't imagine you feeling any sort of lag in that mode.

[ryo-]

I notice the downshifts lag a little bit but the upshifts are almost immediate. maybe you're on to something regarding the break-in period?

[danallxt]

What you are describing is normal, there is a brief lag.
about as good as you can get without a pdk

[Bandit009]

Originally Posted by FunnyUsername

Not sure if this is typical, but I noticed that even when the car is fully warm, shifting with the paddles has maybe 0.3 to 0.4 seconds of lag before the computer accepts the input and actually starts the shift.

Would the break in period have limiters causing this?

If not, is there a way to increase the shift responsiveness? Perhaps some kind of setting or xHP tune?

This is the fastest automatic transmission I have ever driven. I have NOT driven a DCT so can’t tell you how it comes compares. With that said, I find in sport or sport+ the upshifts are quick and done with authority. The downshifts are bit slower but still pretty quick and again done with purpose.

[XC3LLR8]

Throttle input also plays a role. If you're not accelerating hard the computer has no reason to believe the shifts need to be at their quickest.

And yes, xHP will increase the responsiveness as it increases the line pressure. I've really enjoyed xHP. I feel it should sell for about $100 less, but it's definitely a quality product. It's almost worth it just to see what gear I'm in while in D.

[PNTDG42]

Originally Posted by Bandit009

This is the fastest automatic transmission I have ever driven. I have NOT driven a DCT so can’t tell you how it comes compares. With that said, I find in sport or sport+ the upshifts are quick and done with authority. The downshifts are bit slower but still pretty quick and again done with purpose.

A DCT pre-selected shift can basically be performed in the time it takes your brain to perceive the “click” in the paddle shifter. It’s nuts. But a non-pre-selected shift request is like catching the trans with its pants down and it is a bit cumbersome, probably even more so than a 8HP paddle shift. Except a Porsche PDK which seems to do unpredicted shifts very well, in the very few that I have tried.

[Jonesymx29]

Originally Posted by FunnyUsername

I was in sport+ with sport transmission. The lag is pretty obvious

Huh... if you're experiencing .3-.4 sec of lag in sport +... I'm not sure what to tell you, because my car doesn't take that long to shift in that mode. My last car was a Mk6 GTI with the DSG so I do know what the immediacy feels like to an extent (obv. not as quick as a supercar DCT or a PDK box).

Maybe you're in sport individual by mistake and your transmission is set to comfort? Outside of that, I'd say that's a problem.

[XC3LLR8]

Originally Posted by Jonesymx29

Huh... if you're experiencing .3-.4 sec of lag in sport +... I'm not sure what to tell you, because my car doesn't take that long to shift in that mode. My last car was a Mk6 GTI with the DSG so I do know what the immediacy feels like to an extent (obv. not as quick as a supercar DCT or a PDK box).

Maybe you're in sport individual by mistake and your transmission is set to comfort? Outside of that, I'd say that's a problem.

At its quickest the ZF8 shifts in 0.2 seconds. Will most people really notice when the car shifts at 200 milliseconds vs. 300?

[Jonesymx29]

I assume not. It takes the average person 300-400 milliseconds to blink, and it's around 400 for a 95mph fastball to reach home plate. If it's taking that long before the transmission reacts, then add in the time it takes for the shift to happen... Maybe that's the perceptible lag?

I don't see it as "lag" which is why I'm troubleshooting. To me, sport+ shifts are pretty near immediate. I don't use the paddles a lot when i'm not in sport mode but the few times I have, it's what you expect from an automatic transmission. My first car with a tiptronic type auto box was my 9-3, which had the Aisin AF33 5 speed... you'd shift and it was like the shift request was sent through dial-up internet.

[XC3LLR8]

Originally Posted by Jonesymx29

I assume not. It takes the average person 300-400 milliseconds to blink, and it's around 400 for a 95mph fastball to reach home plate. If it's taking that long before the transmission reacts, then add in the time it takes for the shift to happen... Maybe that's the perceptible lag?

I don't see it as "lag" which is why I'm troubleshooting. To me, sport+ shifts are pretty near immediate. I don't use the paddles a lot when i'm not in sport mode but the few times I have, it's what you expect from an automatic transmission. My first car with a tiptronic type auto box was my 9-3, which had the Aisin AF33 5 speed... you'd shift and it was like the shift request was sent through dial-up internet.

The OP needs to drive around in my wife's Mazda CX-5 with a CVT. He'll quickly appreciate the 0.2-0.3 response of the ZF8.

[eddj]

Originally Posted by FunnyUsername

Not sure if this is typical, but I noticed that even when the car is fully warm, shifting with the paddles has maybe 0.3 to 0.4 seconds of lag before the computer accepts the input and actually starts the shift.

Would the break in period have limiters causing this?

If not, is there a way to increase the shift responsiveness? Perhaps some kind of setting or xHP tune?

like XC3LLR8 wrote, I guess you noticed the lag because you were not accelerating while shifting. If you do that while accelerating you will feel almost no lag at all.

[danallxt]

yes, it varies accordingly

[FunnyUsername]

Originally Posted by eddj

like XC3LLR8 wrote, I guess you noticed the lag because you were not accelerating while shifting. If you do that while accelerating you will feel almost no lag at all.

Yea I was in half throttle so I guess the upshifts are softer despite being in sport mode and sport transmission. Kind of a weird.

I checked again when downshifting (so throttle input is irrelevant), and the delay is about 50 milliseconds after releasing paddle, then about 80 milliseconds for the clutch to start biting the next gear and bringing revs up. So total is maybe 0.13 to 0.17 seconds from pressing the paddle and getting a response from the transmission. Still better than me with manual but it would be sweet if it was faster.

[XC3LLR8]

Originally Posted by FunnyUsername

Yea I was in half throttle so I guess the upshifts are softer despite being in sport mode and sport transmission. Kind of a weird.

I checked again when downshifting (so throttle input is irrelevant), and the delay is about 50 milliseconds after releasing paddle, then about 80 milliseconds for the clutch to start biting the next gear and bringing revs up. So total is maybe 0.13 to 0.17 seconds from pressing the paddle and getting a response from the transmission. Still better than me with manual but it would be sweet if it was faster.

BMW did a great job of balancing speed with smoothness. This car is a joy in slow stop and go traffic, which most dual clutch’s can’t claim.

[shaman420]

this happened after the last update. it was a lot faster before. there is a lag now indeed.

[TheGeekGuy]

If quicker shifts are what you are looking for you might want to consider xHP Flashtool. From what I read and seen it does improve the shift times, but I would be concerned about the longevity of the gearbox.

[XC3LLR8]

Originally Posted by TheGeekGuy

If quicker shifts are what you are looking for you might want to consider xHP Flashtool. From what I read and seen it does improve the shift times, but I would be concerned about the longevity of the gearbox.

It does improve the shift times. What kills the longevity of the gearbox is increased torque. xHP actually allows you to control the torque reduction if you've added more power. Simply increasing the line pressure a little (quicker shifts) should be harmless at stock (or near stock) levels.

[FunnyUsername]

Originally Posted by TheGeekGuy

If quicker shifts are what you are looking for you might want to consider xHP Flashtool. From what I read and seen it does improve the shift times, but I would be concerned about the longevity of the gearbox.

I don't know if the shift speed would really kill the gearbox though. All the actual M cars are more aggressively tuned and the transmission will easily outlast the engine. IIRC dodge also has the same transmission and fast shift farts

[DrewYeee]

has anybody noticed a lag when accelerating into a corner, shifting from 2nd to 3rd. its extremely noticeable. wondering else if anyone else has this issue or if it lags for a certain reason.