I did not vote,but checked the car in garage and here's what's wrong from first glance:
- as many do,also you sinned in aerodynamics part - the car has such extremelly low drag,that it allows to exceed 400km/h (translating to your ancient units,that's 250mph),which is way past realistically possible for such car. Also you have added downforce,however I seriously doubt if a sedan type car generates anything more than the amount that counters car's natural lift from air that gets trapped in wheel arches.
- power seems to be higher than real world's counterpart has - quick research led me to 365kW max power available,however this depends if you're going for proper replica.
- also regarding quality - LOD2 has holes in model,probably looks very weird from distance,LOD3 seems to be autogenerated by editor,you should tweak it closer to actual form of body.
Sorry,no intention to insult,just pointing out some misalignment of definitions - removing the negative lift surely also helped to make the car more realistic on technical side. Even of your calculations are correct - I'm still wondering if it would be really possible to reach 380km/h with 560 horsepower motor with car like this,as it is quite a large block. I wonder if Tesla made the announced Cd a bit better than it actually is. 
, still the feedback was very helpful. I should have done these calculations the first time. 