GT4 A-Spec points
 

How do it work????

I guess it is a "measure" of the car you take vs the cars the others have: ie the faster the car compared to the others, the lowest the points?

If this is right, what score should be expected from a fair race?

I would guess it is over 20 points at least, as this is what I got for racing with a RX-8 LM against JGTC cars, and beating them easily.

my theory is that it starts at 100 points if your all driving the same type of car, if you're driving a race car and AI isnt -100 if they're in race cars and you aren +100 and then they just take the average bhp of the AI and then then add the difference between theirs and yours to get the final value