Furidion Games have released their miniature combat racing rules under a new title, M2: Miniature Motorsport.
From their announcement:
Once upon a time in the dim, dark past you may have known it as Petrolhead. M2: Miniature Motorsport is a respawned next revision of that game. Simple, fast and dedicated to motorised mayhem, M2 brings motor racing to a tabletop near you.
What you see in this new 0.0.3 version is the beginning of our Core rules. Much awaits this game, and only time will tell what surprises we will throw in. Plans are afoot for almost every aspect of motorsport, including drag, drift, rally and even monster trucks.