I still don't agree with that graph. No (i.c.e.) car has that torque curve. Did someone make that graph cause I'd like to know how they derived their data. It looks more like a torque curve for and electric motor than anything. I can post torque curves all day long (both real and ones I can make up) and we'll still know nothing about the engine, yet we'll continue to argue about it lol.
Edit: After looking at the graph, I assume whoever made the graph set the max power to 200hp, and calculated torque from the known rpm. If this is the case, it should have been made more clear a the beginning of the thread when it was posted. Of course even then the graph is still wrong...Power is calculated from torque and rpm ie power is dependent on torque. You have to know two before you can find the other one.
Example: The car makes 200hp. What is the rpm and torque?
Well, if the car makes 200 hp at 6000 rpm, then the torque is 175.066 ft-lbs.
If the max power is produced at 3000 rpm, then torque is 350.13 ft-lbs.
The fact of the matter is that neither torque, nor power are linear when dealing with an internal combustion engine (though there is a linear relationship between hp and torque). So again, all we're doing is guessing (and putting out false information).