On 28/09/2015 23:08, Sam Thatch wrote:


That wouldnt be viable. Too many would experience that
performance degradation in real life and it would be very
variable, so they would be demanding it get fixed in the
warranty period causing a big hike in warranty claims.

They couldnt even have a note in the maintenance
manuals saying that variable performance should be
ignored because they couldnt say why that happens
and is nothing to worry about.
I could see that it might be possible to run in clean mode by default at
idle and low throttle openings, and alter it when the pedal if pressed-
after all, this is largely a modulation of the EGR valve, which happens
all the time anyway as part of the normal map.