
78 lbs! Imagine if a real racing car was 78 lbs under the minimum weight requirement and that was still considered legal! Even the 1gm leeway is 26 lbs under in that example.
In any case, we'll allow the 1gm. We don't want to exclude a car for that small variation, however I'd advise that everyone sets up their cars no lower than the actual minimum for the class. Again, this only applies to classes which have a minimum weight requirement. These are currently BTCC (80gm and 85gm, depending on car model), VSGT (90gm) and VSP (70gm).