ipse dixit

Bear with me folks, but I just got to spend some quality time with my 911 this weekend, and noticed that when the car is in Sport or Sport+ mode, the vehicle voltage reading increases about 1 volt.

On my car, in normal it's usually about 13.5, in Sport/Sport + it's usually around 14.4.

I knew about the +/- in oil temp for normal and Sport/Sport+ but this was new to me.

Thanks for listening, just thought I'd share.

John 996 TT Cab

Probably because the engine is revving a little faster at any given speed thus increasing slightly the voltage output of the alternator.