If you want to know, take it to a dragstrip and do timed runs videoing your tach. Real life stuff, not theoretical. I race sailboats and VMGs and performance plots are one thing, but the race course is where it matters. Obviously one can extrapolate values from the Porsche owner's manual and determine intersection points btwn hp and torque and factor in variables like timing and lift off and such, but whatever....
That's too technical. Shift it when it feels good - for me that's just before fuel cut-off (because I dislike the feeling of the engine stuttering due to fuel starvation).
6000, 6500, 7000, whatever, just keep it pegged until it feels good to you, then shift and do it again. That's the "best" time to shift - the point when you're having fun - and the person beside you is smiling too (or keeping her eyes closed).
Sorry if this isn't technical enough. :dance:
Cheers
