By motor I am assuming a nitro fuel-powered car as an electric motor is rather cheap
To enjoy this sim, a simple joystick is required. A few pilots I know get by with a cheap Logitech Extreme 3D Pro. You'll have to do the finger acrobatics quite a bit but after a while when you get the hang of it everything will be fine. The "ultimate" setup is a TM Warthog, TM Cougar MFDs, TrackIR5 with Track Clip Pro, and a set of rudder pedals. I got a Saitek Pro Flight set, the cheapest available, and they do fine. Then you might want some touch-screen LCDs or even just a few more LCDs for the dash display and peripheral vision (triple-screen). But that is as budget allows and is not "needed" to learn and enjoy the sim.
If there is one thing you will want to prioritize though, it would be the TrackIR.