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Old 12-15-2017, 10:03 AM   #71
Norm Peterson
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Quote:
Originally Posted by travislambert View Post
GM must feel that "peak slip %" is usually somewhere between 5% and 15%.
Between 5% and 15% would not surprise me, as that's at least in the same ballpark as the tangent trig function of slip angles on the left side of the peak on a mu-slip plot before the peak itself is reached.

Why not an algorithm that simply ignores slip% below some road speed? Unless I'm mistaken, ABS systems have commonly used this approach to avoid ABS intervention when you really are almost stopped. The necessary sensing should already be in place (ABS, stability control, and hill-start), so it should be possible to determine and in most cases independently verify when to let the slip% become recognized as a valid input.

Yes, this should probably be somewhat mode-specific, as you'd probably want to avoid any wheelspin in 'snow/wet' but you clearly would want to allow it in 'track' and allow at least a little in 'normal' if that's what it takes to avoid the car perhaps unexpectedly falling on its face in traffic.


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Old 12-15-2017, 10:45 AM   #72
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Originally Posted by Norm Peterson View Post
Why not an algorithm that simply ignores slip% below some road speed?
The difference between launch control and other systems that use minimum threshold speeds is that launch control's primary function happens at really low speeds. If you disable it below a certain speed, it somewhat defeats the purpose of having it in the first place.
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Old 12-15-2017, 10:46 AM   #73
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You get my vote. +1.
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Old 12-15-2017, 10:55 AM   #74
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+1 - the issue needs to be fixed!
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Old 12-15-2017, 11:33 AM   #75
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+ 1 for a fix
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Old 12-15-2017, 11:35 AM   #76
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+1 For me as well.

Just got an invite to Hot Rod Drag Week and had to explain why that would not be a great idea with the M6. Hopefully there is some kind of happy medium to this issue.
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Old 12-15-2017, 11:57 AM   #77
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Quote:
Originally Posted by travislambert View Post
Hey Al,

Can you talk to us about the details of launch control and share any tips for effectively launching the 6th Gen ZL1 with a manual transmission?

For those of us with a custom launch control configuration, we can choose a slip target between 5% and 15%. When the car first begins to launch the front wheel-speed is near zero, so any slip of the rear tires will exceed the 15%. How was the car designed to react in this scenario? If there is some mechanism to conditionally apply the slip target as the car begins to move, can you share the details of this mechanism? Are there any factors, such as tire wear, wheel-speed sensor accuracy, sensor latency, etc. that may significantly impact the wheel slip % calculation at very low speeds?

What effect does each PTM Mode/Surface Type configuration have on the launch control?

With high-traction surfaces many owners have experienced what’s being described as “bogging” while launching. Can you help us to better understand how the torque management systems are applied during launch to reduce as well as reintroduce power (assuming wheel-slip/traction is not an issue)?

Can you share with us how the advertised quarter-mile times are determined? According to our “Official 6th Gen 1/4 Mile V8 Fast List”, only one member has been able to achieve the advertised 11.8 second quarter-mile time for the ’17 ZL1 M6 coupe, but many members have far exceeded the 11.4 advertised for the ’17 ZL1 A10 coupe.

Thanks again to you and your team for taking the time to answer our questions.

Sincerely,

The Camaro6 Community
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Old 12-15-2017, 03:10 PM   #78
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My vote +1
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Old 12-15-2017, 04:54 PM   #79
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my vote +1
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Old 12-15-2017, 07:45 PM   #80
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+1 of support for a fix to the bogging, and thanks Travis for your tenacity regarding this.
I usually drive in track mode with TCS off. I feel the bogging problem to be more prominent when taking off at a normal to medium start, after some ‘spirited’ driving.
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Old 12-15-2017, 08:21 PM   #81
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Thanks for the support on this topic! Hopefully we'll get on the poll for round #3.

If you have any forum friends who have struggled with launching the car but haven't yet posted, please encourage them to post something in this thread..."+1", "#MeToo", or whatever they want.
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Old 12-15-2017, 09:52 PM   #82
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+1
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Old 12-16-2017, 09:36 AM   #83
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+1
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Old 12-16-2017, 03:07 PM   #84
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+1

This car absolutely faceplants when it bogs and forces me to ride the clutch way more than would seem appropriate. Huge drivability issue - a resolution is a must.
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