The new testing procedure of WLTP is based on an approximation of the test conditions to real-world circumstances, which means that the values determined will also have a greater relevance to reality. Among the changes this involves are redefined, significantly stricter test conditions and higher speeds together with a substantially longer test duration (30 instead of 20 minutes).
To obtain a more precise determination of CO2 emissions, the new test procedure includes not only standard equipment – as was previously the case – but also all special equipment options of a vehicle. This produces two values for each type of vehicle: the lowest and highest possible standard consumption value according to aerodynamics, weight and rolling resistance. Thanks to WLTP, you will be able to better assess a vehicle’s consumption and CO2 emissions in the future. In the case of a specific vehicle configuration the individual standard value will be indicated directly. In spite of the great accuracy, deviations are of course also possible with this test procedure. Everyday consumption and CO2 emissions continue to be subject to the different conditions of topography, climate and personal driving technique. The traffic situation, the current load carried and the use of devices such as the air conditioning system are further influences on the consumption of a vehicle. One thing is clear: the test conditions are more than realistic than before, which means that higher fuel consumption and CO2 values as well as lower ranges for electric vehicles can be expected on paper. However, this will not have any adverse effect on the real fuel consumption or range. Furthermore, the BMW Group is always working on new technologies in order to improve consumption and range.
The BMW Group is already working on the transition to the new test procedure and is preparing its product portfolio step by step with new vehicles, new engine versions or technical revisions. This will ensure that all vehicles within the entire fleet of the BMW Group comply with the applicable legislative framework at all times.
From September 2017, the WLTP will be compulsory for new type approvals. However, the legislator specifies that the values measured with WLTP will initially be communicated with a calculation translating it back to NEDC values. The EU Commission has developed a correlation technique for this purpose, which will be binding to an equal extent on all vehicle manufacturers. This phase is intended to simplify the transition. Its duration will depend on the respective national legislation and will thus vary from market to market.
From September 2018, all manufactureers will be obliged to test in accordance with WLTP for vehicles sold in the EU as well as in Switzerland, Turkey, Norway, Liechtenstein, Israel and Ireland.
Finally, by December 2020, all countries that adopt the EU legislation for vehicle will have to indicate and communicate WLTP values for all vehicles.