there should be an XML for engineRpm on Car engines.
this would be a nice addition to have in the game, Especially for creators that want to make larger vehicles that use bigger engines, and want to make the engine more torque-y on lower RPMs, as well as maybe adding a revLimiter option in the part options, that can be set between 4000-12000 RPM.
As well as a lb/ft TQ and Transmission option (Keyword: option) for making the car engine act as a car engine. Maybe adding the transmission option into the Part Options of the engine to make it a bit more simple.
Maybe also add an Engine explosion point in the XML, so that when you pass that point for a certain set timer, your engine will catch on fire or even explode.