Is it even possible to truly lug a diesel? I'm pretty sure that lugging is when excessive load causes huge amounts of detonation.
Perhaps it can be adjusted with Vag-Com?
My screen name might give you a clue as to my own opinion on diesel low rpm / high load operation.
I need to perform some phrenology on the car's brains before I start diddling around. I don't want to jump in before knowing what I want to do and how to accomplish those goals. My prior diesels had at most two controllers, one for engine, one for air bags. This one has about 8 and most are inter-related. I would rather be cautious than impatient.
I have the Vag-Com (now renamed VC something something) and the most recent updates, but without any service / diagnosis documentation (awaiting delivery of the ELSA service package I ordered) I'm content with leaving the car as it is for now.
In the case of my 2004 MB E320 4-Matic, it only shifts to the 5th gear at or above 65 kmph (around 40 mph), so I often have to use the manual mode to up-shift (to the 5th gear) at 55-60 kmph (around 33.5-37 mph). I think it should help improve FE.
See? That's what I expected from mine: the ability to select a gear.
I can't start from a stand-still in any gear but 1st.
Leaving the selector in manual mode does nothing to prevent downshifts as the car slows and rpm drops. Then, when accelerating from a stop again the silly thing will not shift out of 1st until red-line when it shifts to 2nd, or until I manually select the next gear(s), or I slide it back over to full auto mode.
The upshifts aren't my bug-bear, it's the unwanted downshifts that tick me off.
Thats the thing, mine will not shift down unless you REALLY gun it, and that has never happened before even when passing other cars or going up hill.
I suppose it depends from car to car, or you could better control it with those automatic transmission computers which I do not know why auto people dont look more into that!! For autos I think its just as important as all those WAI and aero mods!