Algodoo

Good job. Your HP calc is totally messed up though. I got a max of 3000 nm at 2200 rpm, so I got 926hp. Good for 180 kg engine (but at 500z! Dx)

However, it loses pretty much all torque below ~2000 rpm. It's like a turbocharged engine with very severe turbo lag. You get no power until 2000rpm, then the turbo kicks in and you go like hell.

There's, in fact, some math behind this. Because in a negative-damping engine, your spring gets compressed (piston goes up) then goes back down again with x amount of force more than it started with (where x is your damping, like -0.5 or something.) then when it goes up again, the piston has x amount of force to go back up, so the spring gets compressed more, and then we have x2 amount of force, then it goes back up again...

So the speed/torque increases exponentially, and you have most power at or near maximum RPM. So if you try to run engine at low speed, the piston isn't going as fast, and so increases only slowly until you reach a certain point, then it starts to go faster, and your torque curve ends up looking something like this.. (not my graph! )

Sorry for raving...

It's okay,pnvv. Welp, time to add some anti-lag turbochargers

VRROOOOMOMOMOMO WHAPOW PO POW POW POPOW! POW POW WAPOW! WHAPOW POW!