Document ID: chunk:federal_register_of_legislation:F2011C00805:reg:21:p5
Version: federal_register_of_legislation:F2011C00805
Segment Type: reg
Provision Reference: reg 21 (pt 5/7)
Character Range: 229726–232899

across the test road shall be less than 2 m/s. Wind velocity shall be measured 0.7 m above the road surface.

         3.2.  Humidity

         The road shall be dry.

         3.3.  Pressure - Temperature

         Air density at the time of the test shall not deviate by more than  7.5 per cent from the reference conditions, P = 100 kPa and T = 293.2 K.

         4.  VEHICLE PREPARATION 1[/]

         4.1.  Selection of the test vehicle

         If not all variants of a vehicle type are measured, the following criteria for the selection of the test vehicle shall be used.

         4.1.1.  Body

         If there are different types of body, the test shall be performed on the least aerodynamic body. The manufacturer shall provide the necessary data for the selection.

           4.1.2.  Tyres

           The widest tyre shall be chosen. If there are more than three tyre sizes, the widest minus one shall be chosen.

           4.1.3.  Testing mass

           The testing mass shall be the reference mass of the vehicle with the highest inertia range.

           4.1.4.  Engine

           The test vehicle shall have the largest heat exchanger(s).

           4.1.5.  Transmission

           A test shall be carried out with each type of the following transmission:

              front-wheel drive
              rear-wheel drive
              full-time 4 x 4
              part-time 4 x 4
                                automatic gearbox
              manual gearbox

           4.2.  Running-in

           The vehicle shall be in normal running order and adjustment after having been run-in for at least 3,000/km. The tyres shall be run-in at the same time as the vehicle or have a tread depth within 90 and 50 per cent of the initial tread depth.

           4.3.  Verifications

           The following checks shall be made in accordance with the manufacturer's specifications for the use considered:
              wheels, wheel trims, tyres (make, type, pressure),
              front axle geometry,
              brake adjustment (elimination of parasitic drag), lubrication of front and rear axles,
              adjustment of the suspension and vehicle level, etc.

           4.4.  Preparation for the test

           4.4.1.  The vehicle shall be loaded to its reference mass. The level of the vehicle shall be that obtained when the centre of gravity of the load is situated midway between the 'R' points of the front outer seats and on a straight line passing through those points.

           4.4.2.  In the case of road tests, the windows of the vehicle shall be closed. Any covers of air climatisation systems, headlamps, etc. shall be in the non-operating position.

           4.4.3.  The vehicle shall be clean.

           4.4.4.  Immediately prior to the test, the vehicle shall be brought to normal running temperature in an appropriate manner.

           5.  METHODS

           5.1.  Energy variation during coast-down method

           5.1.1. On the road

           5.1.1.1. Test equipment and error

           Time shall be measured to an error lower than  0.1 s.
           Speed shall be measured to an error lower than