Toyota started yesterday a series of development tests in Central Finland, close to the location where Hyundai has resumed today the last week’s tests after Neuville/Gilsoul accident. After yesterday’s test by Rovanperä/Halttunen, it was the turn of the current World Rally Championship leader duo (Ogier/Ingrassia) for today. And, as in the case of Hyundai, it seems that Toyota might have started to evaluate some aero modifications, in order to improve the already excellent performance of the Yaris WRC in the second part of the season.
S.Ogier/J.Ingrassia, Toyota Yaris WRC, Development test, Central Finland, June 2020 – picture by Taneli Niinimäki (TNPHOTOGR)
Some pictures taken this afternoon show the use of small deflectors in the external sides of the upper dive planes of the Yaris WRC. The purpose of these deflectors might well be to evaluate the advantage of introducing endplates in the dive plane. The use of deflectors/endplates would have a double benefit: firstly, to better direct airflow towards the rear of the car, while preventing the interaction with the external, main airflow. Secondly, the use of endplates would prevent the mixing of air from above and below the planes, thus increasing their efficiency.
S.Ogier/J.Ingrassia, Citroën C3 WRC, Rally Catalunya 2019 pre-event test, October 2019
The use of big endplates in the dive planes was already proposed by Oreca in the new aero package that Citroën tested in the Rally Catalunya 2019 pre-event tests. There, the French team evaluated the new aero package developed by Oreca that should have definitively improved the C3 performance. One of the main modifications of this package was at the level of the front dive planes, where three planes were used, and all of them included significantly bigger endplates.
S.Ogier/J.Ingrassia, Toyota Yaris WRC, Development test, Central Finland, June 2020 – picture by Henri Vuorinen Photography
A second modification shown in thepictures is that the dive planes have been extended on the front. Note the black portion in the upper planes in the picture below.
S.Ogier/J.Ingrassia, Toyota Yaris WRC, Development test, Central Finland, June 2020 – picture extracted from rallit.fi video
The extension of the dive planes is another solution to increase their efficiency. Due to the higher area available, a higher amount of air can be collected and redirected through the car sides, while higher donwforce is generated.