^^ :rofl:

P.S. Why was this topic moved? I think it was legitimate to stay in the E70 forum.

:rofl: :thumbup:

Not necessarily, but possibly.

The trade off when designing the map is between NOx and fuel efficiency. Using SCR provides more headroom, but without it, you are trading mpg for grams of NOx.

So they had two maps, and a detection algorithm that recognized the EPA test cycle (throttle movements, speed, etc) and used either map 1 (EPA) OR map 2 (mpg).

What will be interesting is if the reduction in mpg with the legal map takes the vehicle down to the advertised fuel efficiency, or below. If the former, then customers have been getting a free ride of sorts, polluting more but saving on fuel. If the latter, then I see buybacks.

Volkswagen is making the E70? :rofl:

There are many factors in the trade off calculation with NOx.

First would be fuel efficiency.

Power would be there also, and potentially engine service intervals, engine life, etc.

To me, the big question is, what about the rest of the (non VW) automakers?

We know that engine maps have been tuned for the EPA fuel efficiency test, everything from shifting parameters to cold start modes vs warm start modes. That is legal, if done within limits.

Is it possible that no other manufacturer has played with similar algorithms as VW has done? Certainly the large truck engine manufacturers did it, but what about the current fleet?

For those interested in the technical description of what the EPA says VW did, here is the EPA Notice of Violation.

http://www3.epa.gov/otaq/cert/docume...a-09-18-15.pdf

Sure thing. If you cut the power in half, the NOx will be reduced in [almost] half. I meant that Urea injection will allow for reduced NOx without sacrificing the power and efficiency too much. Reports mention that X5 diesel passed the [real world] tests with flying colors. I dont know which model it was, but E70 is down only 20 or so hp (5-6%)of the ROW model. Thanks to the Urea injection.

Although not given the name, it does look like a BMW E70 to me from the back. Picture on page 38 of the entire study performed by Univeristy of West Virginia on behalf of ICCT :

http://www.theicct.org/sites/default...al_may2014.pdf

Altough I'm not questioning the findings of the investigation, it makes me wonder how and why were these cars chosen for the study and not others/or more, as there are other diesels on the US market

Thanks for posting. On page 41 it is clearly visible that test veh C is E70. You can be sure now all diesels would be tested very soon ;)
It is interesting that even VW with Urea injection showed increased NOX emissions. These probably could be fixed with computer reflash.