Touareg: 2008 R5 TDI
Join Date: Dec 2016
Second Vehicle: Still looking
Thanked 27 Times in 26 Posts
Any proper remap includes measuring the properties of the engine in its current state, then doing a remap (possibly adjusted based on the measured values), and then a measurement of the end results, to see how well the remap works and what the gains are. So, it can only be done on a working car.
Of course technically there could be ways to install a pre-defined remap by you on a DIY-basis, or by you bringing the ECU to a shop with the appropriate equipment (for firmware flashing), but you could possibly never (objectively) know what the results were. And most remaps are for performance gains anyway, and not adjustments for non-standard climates.
Also, the engine will measure the ambient air pressure anyway and try to adjust the fuel ratio and its inner workings to that, even without extra tuning. Anything beyond that is most likely only possible by having custom and/or parts, that were designed specifically for that climate/region, installed. In that sense a UK version of a car is possibly the worst one you can have in your climate/region, because if it has any per factory customizations, they will be for the exact opposite of the environment you're about to use the car in.