YES this one of the favorite thinks that you have to do if you create string engine, by changing legacy mode to 2 you can add even more damping like -2. It makes engine stronger.
Ok, so first. If you making a string engine. Make string with legacy mode 2. You can find it in a script menu. Make two cylinders to avoid massive vibration. Make piston like 50 kg/m3 and flywheel like 300 to make it sure that is gonna be stable. Try everything that i said and we will see how its gonna be next time.
Spawn engine at high rpm starts move a car without any forces. It Algodoo physics engine fault. Same think if you reach more that 110 rad/s engine starts go up in a air. Lift him self up with no reason! It really annoying.
Thanks faytree, i just know how attract people to play it. And i have some kind of reputation in Algobox so when people download it they know what to expect. I think that is how it works.
I can help you with car performance if you want. It is not so hard. Bud i using spawn engines. I don't really know how that one works, that you have there.