So I created a vehicle using wheel colliders, my question come up to be that when I drive up a hill with full speed, my vehicle stays in the air for too long, I was wondering if there are anyways to make my vehicle fall faster… I tried to modify the gravity under the edit-settings, but that changed my speed and so on too. Would think mass is irrelavent.
Thanks, Shan.
Maybe your vehicle is really big and you are making it fall from a long distance?
try making it smaller 
No, it’s not that, even if i do make it smaller, the car just rockets it up through the sky, and stays there for long time, and if i tune down the speed, seems like the car isn’t going fast enough on straight way, but cars doesn’t go up into air as much. The only way I was able to reduce the problem was actually modifying the gravity.
If you increase the object’s mass, any force that can make the car go trough the sky will have to push harder to make it fly.
After I take alook at the script for awhile, I find there are two problems with this physics:
1st: wheel colliders(Frictions)
2nd: once it’s in air(the pulling down force).
1st: Um… as far as 1st setup, If I decrease the grip friction inside wheel colliders, such as decrease friction value, and decrease extrume value, it starts to Drift(loose grip more), which result when going up hill a loss in friction, which also result a much better physics rather than vehicle just climb up the hill and rocket through the sky.(solved!)
2nd: I can’t really determine the problem,(but seems has to do with pulling down gravity force, and foward velocity), and by applying extra force downward does seem to temp. solve the problem, that’s kinda like hardcoding, not sure about other ways doing it. If you guys have any idea please give some feedback on this.