Unsolved Car model falling apart

Hi, its probably a easy solution too this, but i cant find it. Hoping this is the right place. So i have created the car chassis and all its parts. And when i convertert the blender chassis and put it into a jbeam file and tested it out it looked like the video.
Its just falling apart, and is the nodes thats falling? Have i used too many nodes/beams?
How can i make it so it doesnt fall.
Ps. idk how too put bumper and stuff so that is break and stucks too the car. And get the engine/ suspension working.

Thanks for help.

 

The node count is way too high if want I can help you make one which is more suitable for the game.

 

The nose? All those nodes? How can i minimise them without the car beeing changed? They are all vertexes

 

make a seperate mesh in blender fro jbeam purposes only.

Also If want PM me the .dae so I can make it for you.

 

Yeah we can look into it. Ill pm you either today or tomorow.