Algodoo

This right here is the fastest spring engine vehicle ever.* (I think)
It is powered by a 6 cylinder engine that idles at nearly 1,800 rpm. The engine is attached to my tried and true 5 speed gearbox. The vehicle can accelerate to 27 m/s (60 mph) in less than 1.6 seconds, with traction being the limiting factor. The truck's top speed is over 200 m/s (450 mph). The engine is so powerful that in some cases it can start from 2nd gear. There are some drawbacks to this truck however: It may explode if dropped or flipped.

Instructions are in the scene.

If you doubt that this is the fastest spring engine vehicle ever, prove it by showing another one with a link in a comment.

*Note: This truck is realistically sized. You can obviously make a vehicle that's faster by making it 100 meters long.