I found a super-easy way to make an estimated 0-100 km/h or 0-60 mph time.
You just have to divide the weight with the power. It works only from about 100 to 620 bhp.
Nissan GT-R: 1740:480= 3,625 s
Nissan GT-R Nismo: 1720:600= 2,86 (s)
Mazda MX-5 2.0 (Mk IV 184ps): 1050:181= 5,8 (s)
Audi S4: 1780:350= 5.0 (s) (bit too much)
Subaru BRZ: 1220:200= 6,1 (s)
Suzuki Swift Sport: 965:140=6,8 (s) (this isn't that good)
Porsche 911 Turbo S (991): 1600:580= 2,75 (s)
It doesn't work with very high-performance cars like Bugattis:
Bugatti Chiron: 2000:1500= 1,33 :D