GoFaster
Moderator at Large
The complicating factors here are the turbocharger, and the fact that the air/fuel ratio is not constant like it is with a gasoline engine.
On a non-turbo gasoline engine, the torque curve is essentially the volumetric-efficiency curve (at full load). The engine makes the most torque at the RPM where it breathes the best. And to change that ... you change the camshaft (or the intake and exhaust tuning).
This approach works on gasoline engines. Installing a different camshaft and sorting out the intake and exhaust tuning on my little Honda CBR125R cut normal fuel consumption from 3.2 - 3.3 L/100 km to around 2.9 - 3.1 L/100 km and it makes more power, too - necessary when you are only starting with 12 horsepower.
On a non-turbo gasoline engine, the torque curve is essentially the volumetric-efficiency curve (at full load). The engine makes the most torque at the RPM where it breathes the best. And to change that ... you change the camshaft (or the intake and exhaust tuning).
This approach works on gasoline engines. Installing a different camshaft and sorting out the intake and exhaust tuning on my little Honda CBR125R cut normal fuel consumption from 3.2 - 3.3 L/100 km to around 2.9 - 3.1 L/100 km and it makes more power, too - necessary when you are only starting with 12 horsepower.