"DJC" wrote in message ...
On 28/09/15 10:28, Sam Thatch wrote:


"Dave Liquorice" wrote in message
ll.co.uk...
On Sun, 27 Sep 2015 17:54:50 -0700 (PDT), wrote:

The cheatware detects when a motor undergoes emissions testing,
and
then

how is that possible?

As others have said by some physical anomally that wouldn't occur in
the real world or by the "brain" knowing what the testing profile is.
ie stationary at idle for 15 seconds, 1st gear to 10 mph in 4 second
2nd gear to 20 mph over 3 seconds, 3rd to 30 mph in 3 seconds, hold
for 30 secs, up to 40 in 5, up to 4th hold for etc ....

That second possibility wouldn't work. By the time its noticed that
pattern, it's too late to run the engine so that the emissions would
be good enough to satisfy the test.

Think the other way round: assume it is always a test until departure from
the profile proves otherwise. It doesn't matter it occasionally the real
world performance is degraded to test profile as it will not be sustained
for long.

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.