[MR_M2]

Is there any reason why BMW omitted launch control in 6MT? Focus RS, Civic Type R and even the Mustang GT has it.

I know it can be done in an old school way, but just curious.

[CommitConfirm]

Surely every manual has launch control. A left foot and a right foot?

[MR_M2]

Has anyone tried launch control in a manual car? Does it offer any benefit over regular "left foot right foot"

[Joaozao]

Originally Posted by MR_M2

Has anyone tried launch control in a manual car? Does it offer any benefit over regular "left foot right foot"

I have in a previous car. It would just hold the revs at 3k or wherever you set it. This way you can floor it and just pop the clutch and go

[Em-Two]

Originally Posted by Joaozao

I have in a previous car. It would just hold the revs at 3k or wherever you set it. This way you can floor it and just pop the clutch and go

3k hmmm. I don't know what the best revs would be for a launch but my previous cars I've launched at 5-5.5k.

[CommitConfirm]

Every car is different... and there are a lot of variables from tyre grip, road surface, turbo spooling, etc. That's part of the skill of learning to drive. I believe the M2 DCT allows you to set the revs you want it to hold at.

[3Si]

With DCT, there will be way too much wheel spin with a 5k dump. Around 3-4k should be the sweet spot with PSS on the strip.

[M3 Adjuster]

Originally Posted by CommitConfirm

Every car is different... and there are a lot of variables from tyre grip, road surface, turbo spooling, etc. That's part of the skill of learning to drive. I believe the M2 DCT allows you to set the revs you want it to hold at.

learning to drive?

skill?

who does that any more!

Additional factors in determining when to shift optimally include gearing and the hp and torque curves of the motor.

[chris719]

BMW's launch control is rather pathetic. Ideally it would be a closed loop system that keeps you right on the edge of wheelspin so you get maximum acceleration for the given surface that you're on.

Why don't they implement it correctly? Not sure, it might put more stress on the drivetrain than they want.

Traction control is the magic of Tesla's 0-60 numbers. You can get into a Model S and slam the pedal to the floor and you get a perfect launch every time. This isn't even about the electric motor; these cars have more than enough power in first gear to spin the tires. Why there isn't a good implementation in most ICE cars I do not know.

[3Si]

Originally Posted by chris719

BMW's launch control is rather pathetic. Ideally it would be a closed loop system that keeps you right on the edge of wheelspin so you get maximum acceleration for the given surface that you're on.

Why don't they implement it correctly? Not sure, it might put more stress on the drivetrain than they want.

Traction control is the magic of Tesla's 0-60 numbers. You can get into a Model S and slam the pedal to the floor and you get a perfect launch every time. This isn't even about the electric motor; these cars have more than enough power in first gear to spin the tires. Why there isn't a good implementation in most ICE cars I do not know.

Not quite sure what you mean. I've had launch control in Audis and Porsche, and they are all quite similar. Rev to a certain RPM, and dump the clutch. BMW allows you to adjust the RPM which would help in certain conditions. Most launch control requires you to disengage traction control anyways. As for the Tesla, the one that gave me a perfect launch was the Model X AWD in ludicrous mode. But that's AWD, we can't compete with AWD. When I tried the S in RWD, the launch was still very nice, but you can feel power being cut significantly to avoid wheel spin. They are also much heavier cars with a lot of batteries at the bottom which helps with launch when you have that much torque from the start.

[ajvdh]

Originally Posted by chris719

BMW's launch control is rather pathetic. Ideally it would be a closed loop system that keeps you right on the edge of wheelspin so you get maximum acceleration for the given surface that you're on.

Why don't they implement it correctly? Not sure, it might put more stress on the drivetrain than they want.

Traction control is the magic of Tesla's 0-60 numbers. You can get into a Model S and slam the pedal to the floor and you get a perfect launch every time. This isn't even about the electric motor; these cars have more than enough power in first gear to spin the tires. Why there isn't a good implementation in most ICE cars I do not know.

I'd hardly describe it as "pathetic", IME, it's consistent and quick, even with variations in grip. There certainly is a feedback loop: On lower friction surfaces, the clutch never fully engages in first gear, and you can hear and feel it balancing the tires on the hairy edge of adhesion all the way through at least 2nd.

Electric cars have a huge advantage when used in a feedback loop. If you modulate the electricity going in, the output torque from the motor tracks it immediately. In an ICE, there's always going to be a delay between a change in throttle position and a change in output power. Turbo engines are even trickier, as throttle response isn't always linear.

[PackPride85]

I have a feeling the 6mt in the M2/M3/M4 is not the most "robust." No launch control and forces you to rev match on downshifts unless traction control is completely off.

[mrcheezle19]

Originally Posted by PackPride85

I have a feeling the 6mt in the M2/M3/M4 is not the most "robust." No launch control and forces you to rev match on downshifts unless traction control is completely off.

Guys are putting over 600whp through this trans.. So umm its robust.

[PackPride85]

Originally Posted by mrcheezle19

Guys are putting over 600whp through this trans.. So umm its robust.

Maybe the stock clutch? I can't imagine 600whp without an upgrade clutch.