JohnSimmons

Yes I think I will ask for the Specific Fuel consumption figures and avoid the remap for the moment.

Guys, first off thanks for the charts. I read those charts and I can see some issues that you may, or may not, notice depending how you drive. In the re-map as it cuts torque below 2,500, so the changes will be all around the lower rpm region I would guess this is because the emissions test is probably biased towards those regions as after all in my car I think 2,500 is close to 90 on the motorway. So those who run lower gears or run heavier cars, like the 4WD Tiguan would be more likely to spot the issue. To get lower Nox you need to lower combustion temperature (less efficient combustion and possibly more particulates) by probably run more exhaust gas re-circulation and I wonder if they have altered the pilot injection timing relative to main injection. Puling the pilot forward probably could cause the noise change some have heard in these engines. If they have a fair bit of carbon build up this could be more obvious and it is possible it is more sensitive to engine to engine variation in compression. Plus if they are doing that then regen of the particulate trap filter will occur more often having a negative impact on economy. I think I will leave alone and I do not think VW can say it makes no difference to engine performance as you can clearly see it has lower torque up to 2,500. I think I will write to VW and ask them to send me the full engine torque and power over RPM data like the above when tested before and after. I do a lot of driving on A roads and Motorway so a lot of those miles are in the 1,800 to 2,500 rpm range. It looks like it will have a bit more for overtaking though. My concern is loss of economy as yes you can shift down to replace the lost power low down but doing about 25,000 miles per year I would want to comprehend the economy and also life of Particulate Trap filter impact.