real world car parameters

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My best guess would be trying to match the data available online, like front/rear load at certain speed... Then it will depend on the complexity of the simulation how close it comes to the real world.

In general I am not a fan of tuning car parameters to make them work with the sim, as it makes really hard to change the sim code (also an issue in VDrift). I prefer to mess with the sim to get it work with "realistic" parameters. But there are limits of course, this thing has to be playable after all.