Too much Engine Braking in a Diesel

Diesel engine don't have throttle valve, lift-off the gas pedal shouldn't have an engine braking effect.
The engine friction is friction+enginebrake+dynamicfriction
Before 0.17 update, both gas and diesel have the same engine braking effect, the engine braking torque is 2*friction.
After the 0.17 update, engine braking and friction can be defined separately, which is good.
The calculation is friction at full load = friction+dynamicFriction/(RPM/10), friction at zero load = friction+dynamicFriction/(RPM/10)+engineBrakeTorque
For example the ETK 3.0L I6 engine, the friction is 15 and the engineBrakeTorque is 44, this leads to a total of 59Nm(excluding dynamic friction) of braking torque. However in the ETK 3.0L I6 Diesel, the friction is 18 and the engineBrakeTorque is 30, this leads to a total of 48Nm(excluding dynamic friction) of braking torque. Since diesel engine don't have throttle valve, the zero-throttle friction should be very close to full-throttle friction, thus the "engineBrakeTorque" should be very closed to, if not at, zero.

 

how could i implement the engine brake torque to an older style moded engine i have?

 

I don't think they have enough actually. In first gear, my 5.0 diesel with a 16.3:1 compression ratio will stop my nearly 8000 pound truck in a heartbeat. Rear axle ratio is between 3:1-4:1 and the first gear ratio is 4:1-5:1. It does have a tow mode which will actuate the turbo vanes to open fully on the turbine side to act as an exhaust brake, but I don't think it plays into the equation much. The 6.0 V8 has ZERO engine braking power, it is so low on it that it's near impossible to use the engine brake to slow the vehicle. Might as well be a little gas engine in terms of engine braking power.