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Originally Posted by WolfpackS2k
The electronic differential Porsche offers on the 718 (and 981 before it) (and 911 I guess) is an active overdriving unit. Specifically designed to improve handling. I highly doubt it is deactived if PSM is "shut off".
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This post is about 987.2
But quick readup on 981 sez that PTV option is a clutch-type limited slip (probably same or similar to the dinky 987 unit with modest ramps and designed for very minimal lockup) combined with electronically controlled braking of the inside-rear on corner entry to improve turn-in. Might be fine for normal "spirited" driving but at the track you might want that feature turned off to conserve rear brakes.
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BTW most Porsche models won't let you 100% turn off PSM. I can turn it off on my Cayman S but it isn't really off. Still kicks back on if things get really wild - found this out when trying to do donuts in a parking lot after a snow storm.
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Some have reported having to disconnect a yaw sensor to fully turn PSM "off". In my case I drifted my Cayman around regularly with PSM "off" and got plenty sideways without feeling anything and without the any lights flashing. Might not have been "fully off" but it let me hang it all the way out wihtout interfering
Fun...