Some quick calculations..
Current SCCA rules on 90-95% fully prepped cars, very good National cars but certainly not best.
01/05 125/120 20.0 lbs/P
99/00 128/117 20.0 lbs/P
94/97 124/114 19.87 lbs/P
90/93 123/105 19.95 lbs/P
If you add hp+Tq= power number(P) look at the p/lb ratios..
Under current NASA rules, same prep I came up with...
01/05 haven't tested with smaller plate yet
99/00 122/112 20.42 lbs/P
94/97 123/112 19.91 lbs/P
90/93 123/105 19.95 lbs/P
If there is a problem with NASA rules is the 99 is just too heavy for that plate or too small of a plate for that weight..
If there is a problem with SCCA rules is that the weight disparity is too large.. While the power numbers are very close, on small tight tracks the 1.6 pulls out, on long tracks, the weight doesn't hurt as much, the 99 pulls out.. Leaving the 1.8 car good in both types, but rarely the best anywhere.
Jim
Hmmm....
You are using 123 HP for the 90-93 1.6 so that assumes a pro-motor to achieve parity.