All RWD cars have P1 for performance. you should also have Uncorked in PerformancAddon field
Interesting, I thought only the 75D has a field for "Uncorked" from all the posts I have read. Hopefully there will be a chance for the RWD owners.
So, there appear to be two fields that are relevant here.... One is "Performance" (My car was P3, and is now P1), the other is "Perf Add On" (My car was "Standard", and is now "Uncorked")
Both of these fields can be seen in the car's diagnostics interface (accessible to SC techs/rangers):
The Performance setting can also be read via the Tesla owner API.
Unfortunately, it appears the Performance tag is only useful for checking the "Uncorked" state of your car if you have a dual motor vehicle (like my 75D). And even then, it is only an indicator; PerfAddOn also needs to be set to Uncorked. (and, I suspect, in addition to these config changes, the motor controllers also need to get a firmware redeploy with their new configs/curves, which is likely why this update needs to be done in person and not OTA).
If you do have a 75D though and want to check its uncorked status, you should be able to do so via the vehicle_state call from the owner API.
You'll need an API key, as well as your car's id (from the vehicles call):
Tesla Model S JSON API · Apiary
Code:
curl --header "Authorization:Bearer xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" https://owner-api.teslamotors.com/api/1/vehicles/xxxxxxxxxxxxxxxxx/data_request/vehicle_state
The response should include this:
if you're uncorked.
or this:
if you're corked.
If you use Teslafi, you can see the Performance tag in the raw API data section: