yep I play with 1/4 turns and that seems to be easy to note the difference once you are close.
How do I exactly know I am close enough? Egt's, smoke? or a combo of the above?
Also, don't want to scatter the 1.6td.
Also, I suspect avg. weather conditions are needed? Currently, hot as hell here on PEI - ( i know 30 deg. C, isn't that hot, but is is here)