Autpsport web GT500 season review part.2 Toyota
https://www.as-web.jp/supergt/654528?all
*Supra's breakthrough was supported by the aerodynamic straightness derived from the shape of the base model and the introduce of rake angle.
*Unlike the LC500, the aerodynamics of the supra are the same as the results of the wind tunnel test and CFD.
*As you can see from the appearance of the lateral duct, Supra's drag was low, so Fuji's straight line speed was overwhelming.
*Kazumoto Yuasa (TRD engineer) says that straight line speed in Fuji was advantageous and high rake in Suzuka worked well, but stop-and-go Motegi struggled. High rake concept did not work well at the low speed corner Motegi.
*As for engine development, Takahiro Sasaki (TRD) says that in terms of engine, they struggled with Motegi, where drivability is important. If Okayama was the opening round as usual, they could have noticed the lack of drivability.
This year is Fuji, Fuji, Suzuka, and Motegi, so it wasn't until the 4th round that they noticed any engine issues.
Moreover, in the 4th round, the fuel restrictor was applied in bad weather, so the original lack of drivability was hidden.
*Yuasa says Toyota may change the downforce drag ratio towards 2021.