aight well ive found the formula its unmodified weight times 3.0 for naturally aspirated engines or for turbo/supercharged unmodified weight times 2.5, and for rotars its the same but its the displacement of all rotars times 2. ok now ive got this can someone please tell me the exact weight of an unmodified 1200 sedan, as this is the weight u apply the formula to. i hope this helps others out as well as me. thanks