Important things about emissions testing

It might not attract you a lot, and it is in fact the least interesting subject, but it’s important for you to understand the WLTP test procedure. If you read auto articles, you are probably familiar with WLTP, or at least know what it stands for. It takes into account traditional, hybrid, and electric cars. If you are a regular reader of any auto blog, you might have seen several articles on it. There are different reasons why it’s been given so much importance.

One of the reasons why there are a lot of articles on this topic is because there is a lot of news regarding this. For example, in 2018, we got the news that Audi sales in the UK have dropped due to WLTP. In 2019, we heard that Porsche sales have also fallen due to it.

Many people ignore this subject, but you should not, as it can affect the cost you are going to pay. You should know what figures you need to keep an eye to save money or lower the taxes.

WLTP is a better alternative to NEDC (New European Driving Cycle), used to produce more accurate figures for emissions and fuel consumption. NEDC had been used since the 1980s, but today, it’s not useable anymore, due to changes in technology, etc.

The discussion for WLTP first started in 2008, and the original plan was to regularized it in 2018 and launch it in 2023. But, then they decided to accelerate the process, and in September 2018, it became mandatory.

The WLTP process has some similarities with the NEDC like both are done on a rolling road in laboratory conditions. But, that’s it, there are no other similarities. NEDC test takes up to 19 minutes, whereas as WLTP test takes up to 29 minutes, however, the complete process is finished in up to 5 days.

For the test, real-world conditions are used, the temperature is set to 22deg C. There is another difference related to the gear changes during the test. In the WLTP test, different gear shifts points are used for each vehicle, where there were only fixed points for gear changes in NEDC.