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Instability is not really a problem I have driven stock cars which handle much worse already at lower speeds. Lupo still goes like on track but heavy side winds shake it little bit.
Rear diffusor will be build but it will not cure the problem, which is caused by long boattail and short wheelbase. Sidewinds just make torque forces to the car, which effect the driving. When the car is also light it does not help.
You can lower those torque forces :
- lowering the car
- making also long front bumber to compensate long boattail
- making smaller aero tweaks here and there and try to calculate them with CFD or wind tunnel.
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