I've searched the forums and haven't found any help.
I'm using XSI foundation 5.0 and don't know why, but when I make a simple collision for it( just a box) and the collision is totally weird. I did that .option thing with - donotmergecollision and it didn't work.

you have to write the colliion primitives in the odf of the vehicle
the primitivesection of my tieviper: you have to make shure that the collisionprimitives are still primitives=that you can edit them via the propertypage (subdivisions)

So I have to do all of this odf scripting?
I just made a box, named it collision1 and exported it as the collision of the object.
For some reason it creates some totally different collision, and even makes one when I put "-nocollision" in the .option file.
Could it just be the exporter?

no
write -keepcollision into the msh.option
this scripting is only necessary if you want to save memory, if you dont care about using a bit too much memory, simply make a polymesh as collision for all collisiontypes like i did for the ordnance and soldiercollision

No this doesn't help. I tried that just now and it doesn't work.
Any other ideas?