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Is there a way to set the maximum TACC speed to change with the current speed limit?
- Thread starter Samathan
- Start date
EVRider-FL
Active Member
There are ways to quickly adjust your speed when using TACC, but it depends on which model you have. Look at the TACC section of your manual for details.
I see this sometimes too. It _seems_ to sometimes update the max speed limit for TACC/Autopilot if it is enabled. It also seems to depend on vision seeing a speed limit sign at times. I haven't figured out the logic for when it updates and when it doesn't. I do see it lower the speed when coming to slower regions on the same road.
EVNow
Well-Known Member
No - but in any road where the max speed is showing - you can just touch the max speed on the screen to set your speed (to the max speed).
If the max speed limit is not changing - use the scroll wheel to quickly change (usually goes up / down by 5 mph for every quick scroll).
EVNow
Well-Known Member
Yes.
With FSD, you would have set a offset - and it uses the offset to set the speed at any point.
EVNow
Well-Known Member
EVRider-FL
Active Member
For the S, engaging TACC with the AP stalk sets it to the max speed (speed limit plus offset) by default, unless you’re already going faster than that, in which case it uses your current speed.
True, for engaging, that sounds like the same behavior I see in the X. The question was, say you are set to 45mph max and the speed limit goes up, do the S/X ever/always/never increase the max speed on their own? It seems to rarely happen here, but I thought it had done it a couple times.
Does pulling the stalk forward while already engaged do it? I don't think I've ever tried. I usually just bump it up in 5mph increments.
TunaBug
Member
EVRider-FL
Active Member
I don't think the cruising speed will increase for speed limit changes unless the car automatically reduced the cruising speed in response to speed limit changes, road curves, etc. For example, if you initially set the cruising speed to 60, and AP reduces it to 45 because of changing conditions, it might go back to 60 automatically but it won't go faster.
EVNow
Well-Known Member
But does it increase when the speed limit changes for just TACC, without FSD / AP?
EVRider-FL
Active Member
TunaBug
Member
Oh I see. It used to, but not any more.
I've been on firmware 2021.4.13, 2021.4.15, 2021.4.18, 2021.4.18.2, 2021.12.25.7, 2021.24.5, 2021.24.11, and currently 2021.36.8.
For most of those it would kinda-sorta follow changes in speed limit. I've got it set for speed limit +4, so if I engage TACC in a 35 it would set to 39, and if the speed limit changed to 40 then TACC would change to 44. But I say "kinda-sorta" because it would not always change. My theory is that it had some non-obvious heuristic whose intent was to only change if I hadn't overridden the setting using the right knob: if I was controlling then it would let me control, otherwise it would do it.
It no longer follows changes to speed limits. I just deliberately ran it through some scenarios on the way to work, making sure I never used the knob to override the setting. Starting out in a 35 it did not adjust up when the speed limit changed to 40, and on another street it did not adjust down when the speed limit went from 35 to 30.
I am not sure if this new behavior started in 2021.24, or if it's new in 2021.36.8.
So if I'm running FSD, is there any way to have TACC NOT change speed automatically when speed limit on the road changes?
EVRider-FL
Active Member
In my experience, AP doesn’t adjust to speed limit changes, but others seem to be seeing different behavior. In any case, I’m not aware of any setting to control this.
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