There is no butterfly (throttle) valve in injected diesel engines.

I agree our engines are complicated and some settings interact with others. HP is very dependent on CR. Higher CR results in more power. This is how model diesels make more power than other fuel types(though not in all cases). We could get more power but timing is advanced too much and problems result. Team racing is an application where power is important. Increasing CR will improve power and fuel economy. They do what they can to improve those two things. Delaying ignition and shortening combustion time is something they benefit from.

RingWinger, you mention energy density of fuel. Is this BTU/Lb? Most petroleum based fuels are in the 17-19,000 BTU/Lb range. Not enough variance to be concerned. The mass density varies quite a bit, but energy density doesn't.

We know that we don't need ether in the fuel for autoignition at reasonable CR. I'm running my engines on etherless fuel at the same CR as ether mix. Why is this if ether's cetane rating is near 100 and we are mixing 35% typically?