I bought a Fiat 500 and made a hillclimb car out of it. Not with the focus of getting up fast, just getting up at all. The engine is stock, not even an oil change. It's producing an amazing 16 BHP. What to do with that power?
Give me a stick long enough and a pivot and I shall move the world. / Arkimedes
Or in this case: Give me a gear short enough and I shall climb the Eiger.
So I bought a customizable gearbox, set the final gear to the smallest diameter, then set top speed to the minimum value, made 1st gear as small as possible and then set final gear to the biggest diameter. Now this car can climb anything! It will do so at a maximum top speed of 7 km/h, but it will at least get there.
The lack of traction due to the gravel at Eiger was countered by applying the brakes while I was accelerating. The front brakes helped preventing the car from sliding down, while the rear brakes acted as an old school traction control, making the wheels dig in and get short bursts of traction. So it kind of skipped up the Eiger hill, at 2 km/h. But it got up in the end, and that's what counts!
The top speed on level straights is 50 km/h, and it easily reaches speeds of 150 km/h or above when travelling downhill, by putting the gearbox in neutral (just tap the handbrake).
Also, the acceleration from 0-6 km/h is really impressive! Just watch out for wiplash when doing acceleration tests!