not just separate companies, but un related companies (chapman DID have the car and F1 teams as "separate" companies but very much related.)
Lotus F1 - has absolutely nothing to do with Lotus cars or engineering, and vice versa - there is no money, no talent, nothing. the only connection is Lotus cars gets rights to sell F1 merchandise with lotus name on it, and Lotus F1 get to use Lotus name on car. thats it... otherwise there is nothing there.
"I really started paying attention to cars was when they came out with the Nissan Z, the first body. Then I seen the Cherokees, the old square ones, and I was like, “Wow, that’s cool.” Then I seen the Isuzu jeeps and I seen the Wranglers."
-Lotus Cars VP of Global Design