Ok,if you want your aircraft to smoke,ol TTT comes to the rescue 😉
This is not an exact science but looks effective enough
At the moment this only works for twin engine Boeing aircraft (737,757,767) and is very simple to do
Download the file and unzip
Place the fx file into the main effects folder and copy/paste the the text into the aircraft config(at the bottom)
Job done
Now go fly and press "I"
😉
http://download.yousendit.com/3836539F1ED768EB
Enjoy