As for knowing where to change gear, you can with experience feel where the power is and get the hang of driving any car in under 5minutes.
The highest torque figure gives the best acceleration.
Sorry pal, Someone lied to you about MAXIMUM engine rpm of this car motor. If Ray Charles were alive he could see what the tachometer on the dash reads in this car. The tachometer reads nothing after 6,000 RPM.
You generally use the gears to keep the engine spinning between the revs at which maximum torquwe is developed and the revs that maximum power is achieved which will be somewhat higher.
Overrevving, even to the red line limit will not always be the best for power output
On a road car with a 9000 rpm limit the optimum engine speed band could be , for example 6500 to 8500.
This will be different for all different engines with the 9000 red line
It is impossible to give a powerband for an engine by just knowing the maximum rev limit - it does not work that way
Car makers ususlly give the max torque and max power figures for their cars and at what engine speeds they are being made at
For maximum acceleration and performance, you typically shift at an RPM that puts you in the power-band for the next gear up. This is typically right around the redline, and it's post peak power, but not by much. You want to remain as long as possible in the peak power-band of each gear. Typically you can just feel when it's the right time.
The people commenting may be thinking he's shifting too late because an M550d is a diesel, which makes maximum power and torque at typically lower RPMs than a gasoline engine. If the reviewer isn't used to driving a diesel, he may be shifting too late.
If you look at this video showing acceleration of a bmw m550d and look at the comments people say he is shifting to late.
i understand that he is shifting at a high rpm but i dont understand how they know at which rpm to shift at. And if you let it Change gears it's self and put it in the fastest mode will the gears change at a correct rpm if its true how would you find out in a manual lets say it has 9000 rpm petrol engine
