Lets say you are driving empty twisties , good visibility and having fun with your CS.
Or when you are at a track?
At waht rpms do you change gears?
What's the optimum.To use the best output of the motor

I told my firend who races cars , I was changing at 7,000, he said its no need for that , I was wasting torque and just using HP.

Would be interested in your opinions.
I come from motorcycles, so Im not car expert, and want to learn as much as possible.

Your friend is wrong. Shifting at 7,000 to 7,200 will give best performance.

If its just for fun shift wherever you want to, however if you want all she can give then I shoot for 7k it sounds awesome, and pulls harder once you up shift.

When it feel's optimum go for it. In the end it is about HP & Torque tha't the rush upshifting and donshifting to the boxer engine screaming and hammering every bone in you as you twist and turn pull into an out of corners hitting a solid straiteway. You get the idea.

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Flyboy