You don't need to be specifically in Race mode of PTM in order to see the TC light upon PDR playback. Any PTM will will do this to show you when you were asking for more throttle than the PTM TCS algorithm was prepared to give you (in order to maintain rear wheel traction).
In addition, you can sometimes hear when TCS activates. I drove in PTM Wet mode for the first time on a partially wet track, and on occasion could hear a low pitched engine moan on corner exit, which I believe is the PTM pulling engine timing to reduce torque. I don't think I was overdriving corner exits in all those instances, because in some cases the track was actually dry (thus, I'm assuming I was simply exceeding the PTM Wet torque request, as when I changed modes on the fly to PTM dry, the moaning did not recur). Would be helpful if someone else with more PTM Wet experience could comment if I'm reading the situation correctly.
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