The change in weight will make so little difference in speed that it's typically rounded to 0. The top speed issue is very very likely something to do with drag.
I agree it's not weigth, I made test after that gross evaluation. There's no speed change at all with a ballast of "80kg as a driver".
I still think the main diffenrece vs reality is the gearbox.
Following tests are if I got it rigth :
http://www.automobile-catalog.com/performance/2014/1913105/chevrolet_corvette_stingray_7-speed.html -> go to the gearbox spec
Reality Gearbox:
Tremec TR6070
Transmission type: manual
Number of gears: 7
Gear ratios (overall):
I - 2.97 (10.16) -> x final = 8.613
II - 2.07 (7.08) -> x final = 6.003
III - 1.43 (4.89) -> x final = 4.147
IV - 1 (3.42) -> x final = 2.9
V - 0.71 (2.43) -> x final = 2.059
VI - 0.57 (1.95) -> x final =
1.653 => ingame top speed there
VII - 0.48 (1.64) -> x final = 1.392
VIII ---
R 2.9
Speed range
(max speed on gears, top gear value theor.):
(km/h/mph)
I: 83 / 52
II: 119 / 74
III: 173 / 108
IV: 247 / 154
V: 348 / 216
VI: 433 /
269 => ingame topspeed = 235 there
VII: 515 / 320
VIII: ---
Ok now the game gives a default VI x final gearbox @
1.939, by far not the same number
With a gearbox approaching the one from reality (can't really do the exact same):
final @5
autoset @480 kph
I - 1.901 (should be 1.722, this is +10%)
II - 1.282 (should be 1.200, this is +7%)
III - 0.874 (should be 0.829, this is +5%)
IV - 0.649 (should be 0.580, this is +11%)
V - 0.504 (should be 0.412, this is +22%)
VI - 0.408 (should be 0.330, this is
+23%)
VII - 0.296 (should be 0.278, this is +6%)
final - stays @5.
no ballast : 232mph / 374kph in the VI.
+ 90kg ballast (like they does) : 232mph / 374kph
Let's try a different approach... Reset the gearbox, let's choose the best autoset that is close to final x VII in reality : 1.392.
--> autoset @480
--> VII @ 0.434
--> final @ 3.207 (which gives 1.392 for the VII)
--> let's find the VI then : 1.653 / 3.207 = 0.515 -> the game don't allow that.
--> let's put the V at min.
Let's run this :
From I to VII directly since the begining (pass 2, 3, 4, 5, 6) =>
gives 207mph / 333 kph before the curve after the tunnel (with the same 90kg ballast @+10)
=> So the aero "problem" gives only 6mph more to the car. (assuming temperature, altitude plays a role, no bugs in the torque/power plot, no bugs in the engine, then nobody really knows).
The only thing we can tell for sure is the 2014 Corvette C7's gearbox is severly messed up, and maybe it's the same for other cars.
