I did a test of the maclaren mp4 12c with the original performance on the road o f the aiport at the north of Oahu :
0-100 : 4,41 s
0-160 : 7,87 s
0-200 : 11,67 s
0-300 : 30,03 s
0-322 : 38,83 s
0-351 : 51,03 s
according to your datas :
in real life : 0-100 : 3,4 s
0-160 : 6,3 s
0-200 : 9,4 s
0-300 : 29,9 s
0-322 : 45,6 s
According to me, the original game is not so far from the real performance. It is even too slow untill 200 km/h. The 0-300 time is the same.
After 300 it is a little faster but the road goes a little downhill after the airport.
The problem is that acceleration doesn't stop even when the top speed is reached and maybe after 300 is it a little too quick and linear for a lot of cars.
I had already made a topic about that : i showed the beetle reaching 278 km/h in 7th gear ( i added 3 gears) in your road at the east of Oahu but also this road goes downhill.
But, according to me, you decreased acceleration too much.
The cars are now too slow.
You think they are realistic but you road goes downhill.
I think you had a good idea, and a good will but is too complicated to do.