[thstone]

Blue2000s, I don't think that this is going to work out as you expect...

As you can see from your plot of Wheel Torque vs Road Speed, 4th gear torque peaks and is going down as the engine reaches the max rpm. It happens to reach max rpm just as it is about to cross below the 5th gear curve. If you extend the redline (increase the max rpm), all you're going to do is extend the 4th gear curve below the 5th gear curve. Which says that you should have shifted.

And in fact, you really should have shifted when the rear wheel torque peaked instead of riding out the decline as it is more beneficial to be on the increasing side of the torque curve than on the decreasing side.

Look at it this way, a CVT transmission does not simply run the engine at max rpm, instead it runs the engine up through the maximum torque.