Help with pinned physics

Hi there, im from Russia, sorry for my grammar. And i need help comrads)

I making 2d stunt racing game for tablets. I make Car from multiply object with physics behaviour(doors,base,wheels and etc). I pinned all destroyable physical object to one Car base with Position and Angle. But pinned objects with physical behaviour dont collide with ground, its like collision mask disabled. Collisions are tracking but objects dont collide. Help me with it. Or say me another way to make physical objects stay together

Here some screens from crush tests)

before

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after

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Combining the physics behaviour with any other behaviour that affects position is usually a bad idea. The other behaviours override the physics behaviours and create a very unstable physics simulation. You should rather use the physics joints to attach together physics objects.

When i use physics joints object rotates around image point. i need to keep angle and position

You need to use the right joint for the right situation. I suggest that you read this tutorial: scirra.com/tutorials/65/physics-in-construct-2-forces-impulses-torque-and-joints