Hi,
i Made a car like in the tutorial but when i change the wheel physics to kinematik and simulate my car just flys away realy fast, it dont falls to the ground.
i double checked the rig etc. but it was good.
thanks for help in advance
Siebencorgie
I’m experiencing the same issue both in 4.2.1 and in 4.3.
I tried different car setups, one very simple with just a block, four cylinders and five bones. Everything works fine until the wheel physics are changed to kinematic, then the car goes completely crazy.
I got the Same
i noticed at cars where the Wheel Physic Volumes arent touching the rest of the car i dont get this bug, also im somtimes abel to use sutch a bugy (?) physic for my Blueprint.Then the car is working, like at my torino ( link text ) he also has this bug but is driving nice.
Siebencorgie, could you file this under bugs? I hope this can be fixed soon.
Sorry one more stupid question, how do i file this under bugs? (._. )
Moved to “Bug Reports”. It was available for me under “More → Move to Space”, but I’m not sure if that’s a moderation option or not 
found it, thanks
This error has been reported before and was fixed by making sure that the root bone is at 0,0,0.
But I double checked that in my setup and the vehicle physics still go crazy.
I fixed the issue for my setup. Since I use Maya, my up axis was Y and not Z as required.
So for all the Maya people, make sure you adjust this in the preferences right away!
Had the same issue and am using 3dsmax. All i had to do was set the Root bone to 0,0,0. That fixed this issue.
I also had my vehicle fly straight up once I set the wheels’ “Physics Type” to “Kinematic”. This happens in the game and also already once I press “Simulate” in the PhysicsAsset and vehicle blueprint. For me the problem went away once I set the “Bone Name” fields correctly in the vehicle blueprint.
Note that once I set the bone names for all my wheels the vehicle behaves correctly in the game and in the vehicle blueprint simulation. In the simulation of the PhysicsAsset it still flies up though. It seems that any wheel without the Bone Name setup will drag the vehicle up.
Had same problem when exporting from blender and I just found that bones got renamed from something like wheel_fr to FR after importing to UE4
1.Make sure you switch world coordinated axis in Maya or MayaLT to Z up. (This can be done in the preferences window. Realign vehicle or build new facing X forward)
2.Make sure your pivot transformations for all meshes are reset (example: transform, rotation, scale = 1,1,1. use the freeze transformations option)
3.Make sure your Wheel pivots are centered to your wheel mesh. (use the center pivot option, then bake pivot)
It is important to bake pivot! Your wheel pivots make be positioned in the center of the wheels on screen, but they are still calculated at zero offset after freezing transforms and exported at center of world (x 0, y0, z0)
I come from a max background, and this was new to me, and caused a big headache. Hope this helps anyone. Thanks