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extrashaky Very nice material. Thank you! While trying to stay on the subject, I'll comment the following.
In the slides they state that they aimed for a power-weight ratio under 6kg/PS. The issue is that this ratio was achieved ONLY in the racing and bare-bones models in Japan and a model In Europe which weighted around 1210 kg and lower (asuming that the output was really 200 PS). So, the ratio on these cars was under 6kg/PS. All the other models and especially in the North American market were much heavier and the ratio was in the range of 6.3 - 6.4kg/PS. So, this is a kind of "proof" that more (linear) power or weight reduction to stay in this ratio was actually desirable by the factory. In fact you can go even lower the 6kg/PS limit, by using better tire compound which increases mechanical grip. Only thing is that you cannot do this indefinitely. There are limits of how much mechanical grip you can get by better compound and after that you start ruining the characteristic of the car. Then you really need to go into better weight distribution as stated in the posted video at 2:32. It is also what Mr. Tada mentioned in his interview.