Algodoo

The engine is just a sphere with a hinge making it rotates up to 5200 rad/s. Nothing new but it's kinda fun driving it: the engine transmits its rotational speed to two others spheres: one is connected by a friction system to the front wheel and the other to the rear wheel again with a friction system. You can also decide what wheel would be motive and so how the power of the engine would be spent.

HOW TO DRIVE IT:
1) As all my other cars press down to break/stop breaking
2) Now press right (it's toggled) and wait until the rotation reaches 5200 rad/s
3) Pressing F you activate/disactivate the front traction and pressing R you activate/disactivate the rear traction: usually I always start with both wheels so press F and R to activate them together.
4) Press N and start pressing the number of the gear you want to insert; to engage another gear press the number of the gear you currently are using and then the number of the gear you want to use.
5) When (or if) you reach the speed of 400 meters per second press M to stabilize the car. Engine will lose A LOT of its torque after that, so if you want click on the hinge and set its motor torque to 50'000 (here the car will become a little bit unstable).
6) To stop the car (if you modified the motor torque set it at 15'000 before) engage neuter pressing N, then press right and down so that the central sphere will stop: after that press 1, then 2, then 3 until the car stops.
Maximum speed with normal motor torque: around 410 meters per second.
Maximum speed with modified motor torque (50'000): over 600 meters per second (very bugged, I reached 720 meters per seconds but lasers stopped working)