It shouldnt be any richer if remaped correctly and a forced regen is a last resort. As said, i know when it is doing a regen so would not interupt it. Are you thinking of chip boxes that plug into the fuel rail only?
no ... i did a good remap.. only 300gr into turbo and delayed the injetion time... almost no fuel pressure change... did a soft remap , I did it for economy.
the problem was the dpf backpressure was to high and forced fuel trough the piston rings .
it was all ok after taking the dpf and close the egr to 4%.
no more dilution.
I thing even if you dont increase the fuel pressure , you will get more fuel into the engine do to delay tne injection time, and the dpf backpressure doesnt help at all.
I do believe it should be better on yours 2.4 , I have a 1.9 8v eco 115hp and gave only more 15-20hp.
What I don t understand is why you donīt use a pipe instead of the the dpf
and put it if you need to pass mot one day.
the other thing is the egr .you are using exaust smoke into your engine .
if the egr gets dirty , so the engine gets more carbon residue.
and you will get more 15 hp by redusing the backpressure
the 15 hp you are missing you use them as energie against the backpressure produced by the dpf.I think, do you agree?