There isn't really a formula for it, within a limited set of rules you can pretty much do what you want, and power it with whatever you want, they then compete in various classes based on the engines, suspension etc. This car is built by Lofthouse Motorsport, who do build a similar design for each car but the engine is usually to the customer spec, this one is the first Rotary engine, the new owner of this car previously had one with a BMW M3 engine, others have used things like Jaguar engines. Check out our channel for the British Cross Country Championship and All Wheel Drive Championship videos and you will see some of the variety

You think so? Inlet restricted limiting revs. Cars quite heavy, good traction not great deal of power