This Mod aims to provide the real Topspeed of the cars in GTA V.
Additionally, Acceleration - 4x4 Distribution - Number of Gears - Weight- and Clutch Speed was tweaked to the Description of the ingame Internet or to the Real Life Counterparts of the Cars.

I also recommend this mod:
https://www.gta5-mods.com/scripts/simple-metric-speedometer

Version 1:
(Supersportcars)

Name RLCP (Real Life Counter Part)

Adder ( RLCP: Bugatti Veyron 16.4)

Topspeed: 402 Km/h - 250 mp/h
0-100 Km/h (0-62 mph) : around 2,9 sec.
7 gear Dual-Clutch Transmission
Better 4wd Distribution , original Weight

Cheetah (GTA Spano):

Topspeed ~ 330 Km/h (205 mph)
Power: 800 HP
better Braking



Entity (Koenigsegg Agera)
Topspeed: 440 Km/h - (273 mp/h)
Weight: 1330 Kg -
and other improvements

Infernus (Lamborghini Murcielago)

1665 Kg Topspeed: 330 Km/h
Better 4wd Distribution
Faster Gearchanges, but still slower than Double-Clutch

Vacca (Lamborghini Gallardo/Aventador)

Better Handling, 4wd Distribution
700 Hp
Fast "Independent Shift Rod" Transmission
High Reving Motor
350 Km/h (217mph)

Turismo R ( Ferrari Laferrari)

Zentorno (Lamborghini Veneno)

Version 2:
(Sportscars)

Carbonizzare ( Ferrari California T):
316 km/h (196mph), 3,6 sec for 0-100 km/h , high Initial Drive Force for great Wheelspin

Elegy RH8 (Nissan GT-R):

317 Km/h (197 mph) , 0-100 km/h (0-62 mph) : 2,7 sec.
4wd adjustment to represent Real Life "Rocket launch"
Double-Clutch Gearbox

Jester (Acura NSX Concept):

290 Km/h (180 mph), 4,5 sec for 0-100 km/h (0-62mph)
9 Gears, Hybrid with 4wd. Fast Clutch.

Kuruma / Kuruma Armored (Mitsubishi Lancer Evo):
240 Km/h (149 mph), around 5 sec for 0-100 km/h, great 4x4 with much traction
Armored Kuruma is slightly slower in Acceleration, but same Topspeed.

Massacro (Aston Martin Vanquish):
310 Km/h (193mph), 3,7 sec for 0-100 km/h
Automatic Transmission

Obey 9F (Audi R8 4.2):

305 Km/h, 4,6 sec. for 0-100 km/h, better 4wd

Sultan (Subaru Impreza WRX Sti):
233 km/h (145mph) around 4,5 sec for 0-100 Km/h


Installation
1. Open OpenIV
2. Go to update > update.rpf > common > data
3. Enable edit mode
4. Replace handling.meta with downloaded file

No Rebuild Needed!

Always Backup Files!

Next Versions will gradually cover the other Car Classes (stay tuned with the newest versions of this Mod)

Feel free to comment, review or suggest.

Also I´m always happy if someone agrees to help me with providing the Data for the cars ( searching in Wikipedia or GTA Wikipedia)

Videos and pictures are allowed. contact me so I can upload them here.