OK, I did it. I compiled various data on the A-Spec value system. I started a new thread titled A-Spec Point Data; Values, Races, and Modifications at
https://www.gtplanet.net/forum/showthread.php?p=1910374#post1910374. The following 7 replies in that thread are titled:
A-Spec Point Data; Values, Races, and Modifications
A-Spec Point Work: Car Values in Alphabetical Order
A-Spec Point Work: Car Values in Order of Value
A-Spec Point Work: Tire Multipliers
A-Spec Point Work: Power Multipliers
A-Spec Point Work: Weight Multipliers
A-Spec Point Work: Downforce Multipliers
A-Spec Point Work: Line 1 Race Values
I will from time to time modify the incomplete part of the work and for corrections.
Have fun!
Added 9/26:
Touring Mars has closed the thread and until I figure out how to edit, I will put a few items here.
Most important: I listed the race value of El Capitan 200 Mile to be 1240. It should be 1340.
Downforce is a multiplier, but there is an added kink to it. The multiplier is modified by a factor not yet determined. On three cars, I found consistency with the multiplier through power changes, but the 0-60 adjustability range so far is 0.95, 0.96, and 0.97 for the three different cars. The multiplier works by taking the total of the original front and rear vs. the total new, i.e. adding 15 to one and removing 15 from the other yield the same value. I dont know yet if the multipliers I found were different because of car class, or something else. My current assumption is since downforce effectively adds vertical weight to the car, it is a modifier to weight, or modified by weight.
Power is not a simple multiplier. Since the torque curve changes between NA, Turbo, and Super Charger, the values do to for the same power. I have lots of work ahead of me
.