Supra is faster then RX7...faster than Mustang, Camaro SS, WS6 TA.... slower than Vette..
Vette would take em all... Viper takes Vette...
I have a 99 Mustang GT and went nose to nose with a RX7 Turbo one day....We were about dead even to 80 mph then he backed off... A Camaro started pulling away from me at about the same speed one day... Think my shorter gears helped me keep up for about 1/4 mile...then the 60+HP advantage took over...
Remember most of these cars are limited by traction, horsepower at the rear wheels differs due to differences in powertrains, tires make a big difference...and the biggest is probably the driver... They are all fast...
My approximations of 0-60 times are:
Viper 4.3
Vette 4.5
Supra Turbo 5.1
Mustang Cobra 5.2 (with a full 320 HP output)
Camaro SS/WS6 TA 5.2
Camaro / TA 5.3
Mustang GT 5.4
Mazda RX7 5.4