Simply, smoke is an indicator of incomplete combustion. Ideally, an AFR @ 18 maximizes BSFC, giving the most HP per mass of fuel. Unfortunately, that takes a lot of air. So, we take the air we have and maximize HP, even though it is not efficient. Black smoke produces the most power, if you can keep the temperature in check. It is also hard on the moving parts. Personally, I prefer a more stealthy diesel.
Good job, TDIwyse. It will be interesting to see what happens when you really get control of the EWG. You and I have had
vigorous discussions about this in the past. It is very difficult to do it mechanically. We can see the result of the EBP on the back of the EWG valve, combining with the boost pressure against the spring, as reduced boost in the upper rpms. Sorry, but I couldn't resist setting the stage for the next "last mod".
