does adding wings add traction linear? exponential? or is it just a set amount regardless of speed?
i know the springs/suspension compress as speed increases. but i honestly detect only a slight difference in traction at 280mph vs 80mph.
ive been tuning cars on Forza Horizon games for about a year, but this eludes me.
There’s a lot of downforce in FH4, enough you’ll have to raise tire pressures to not lose potential grip to tire deformation at high speeds in some cars. Downforce increases as the square of speed. 2x speed=4x downforce. 4x speed=16x downforce.
NumberLessMath, your post made me go back & raise tire pressure on my S1 car (and it got rid of the ‘mushy’ handling at 180mph) i always account for downforce with spring strength, dampening, alignment, gearing etc… but never thought to adjust tire pressure - so thank you!
i know in reality that aerodymamics are squared, but i have a suspicion that Forza is linear (like 2x speed = 2x downforce)… but im not sure… i cant think of a way to test & calculate it in game.
ALSO:: if your wing is set for 220lb downforce, at what speed is 220lb being generated? 60mph? 100mph?
I’m think it’s exponential, otherwise aero would be more effective at low speeds and drag not have as severe an impact on top speed (Viper ACR, KTM X-Bow).
I don’t know what the reference speed is. I do konw that anything more than 10-15% more weight-relative downforce on the rear will cause abysmal understeer. Some mid-heavy RWDs can work with it, for the sake of extra accelerating grip. Most AWDs and front-heavy cars in general just take a top speed penalty, as well as unpredictable understeer at speed.
What does this mean for my KTM X-Bow GT4 tune that has over 1000lbs of downforce total?
I’m playing FH4 for the first time since mid-March. I don’t know if all cars have changed, but my Henessey Venom, once my most successful S2 car and possibly the most entertaining car to drive in the game, is understeering everywhere. I took the wing off, and to my surprise, it started oversteering, even at low speeds… this isn’t how the game used to be. It’s possible some cars have a flat downwards force injection when aero is applied, with or without additional force added at speed. Dunno.
All of my tunes are now overdamped. Like, I’m running the minimum allowed on the light end of everything with drift suspension, well under 2.0 on some rally suspensions, and less than 5.0 at all times. I realize now I used too much damping then, but question too if the forces have been increased since.