Okay folks, here it is, and remember, none of us (in my playgroup) are physics majors, so be nice!
House Ramming Rules
To hit something or someone stays as per RAW
Use Damage modifiers as per RAW pg. (169 SR4A)
-DV is equal to Speed Modifier (pg 169 SR4A) of whatever or whoever was hit instead of what is doing the hitting
i.e. GMC Bulldog step van (body 16 Armor Hits Harley-Davidson Scorpion (Body 8 Armor 4) going 70kmph as a base example.....Harley needs to soak GMC’s body 16 x 2 = 32dv...GMC needs to soak Harley's body 8 x 2 =16 dice... step van will be hurt and Harley would be completely destroyed.
Now make that a vehicle with 16 armor and the Harley wouldn't have scratched it
-Use whatever speed calculations make sense. Example: Rear end collision, use the difference in speed.
i.e. GMC Bulldog 1 going 60kmph, rear ended by GMC Bulldog 2 going 90kmph = impact of 30kmph
-Ramming plate modification increases damage done by vehicle with the ram plate only, and still increases the DV by one bracket on pg 169 SR4A
-The DV must exceed the vehicle armor rating to cause any damage to the vehicle
-Passenger base damage value taken is equal to half the net damage actually taken by vehicle (round up after soaking). This will be soaked with half Impact Armor
-If passengers are wearing a restraint system of some sort all damage from collision is soaked as stun damage
-If Target vehicle is rammed in a vulnerable position (T-boned, from above, etc) then target vehicle armor is halved