Breakdown #1 under
Join Date: Jan 2011
Location: United Kingdom
Regeneration, is the process of cleaning the diesel particular filter, which is a soot trap in your exhaust system..which appeared on our cars due to Mr and Mrs Brussels intervention, to 'reduce emissions' not taking into account of course that at some point all the crap it collects has to be dumped back out again.
Alfa's use an active diesel particulate filter, and so what happens is that when the ECU has decided that the filter is getting clogged (by using some nifty software and sensors) it heats the exhaust gases up to extreme levels by dumping raw fuel thru the cylinders. This then effectively burns all the soot out of the filter 'regenerating it'.
You will know when this happens for 3 reasons. Firstly the exhaust note develops a very boomy sound to it. Secondly your exhaust gases will smell more dieselly, and finally the car will feel slightly less powerful, and the needle on the boost gauge will instantly drop to zero when you aren't generating boost.
If the car only does long motorway runs, or you constantly drive it like you stole it, then the distance between regens is likely to be much higher than if you pootle along..because the hotter the exhaust gases, the more soot burnt off.
Hope this explains everything for you Mark and Agi!