I’ve blown up a few cars in post and i’ve seen the BBC Series Spooks do a post blow up in their series opener. Truth be told, you can always tell, but if you keep your edits short.
In the past, I’ve had the guys film the car, then drive it out of shot and film the background. Cutting the car out in photoshop, i prepare a final, blown up version and use an explosion to act a transition between the two shots.
Little tricks like blowing doors out of shot can be achieved if they’re done quickly. I do like Zaxwerks for throwing something towards the camera too.
The trick I’ve found is to have lots going on to distract the viewer and keep the shots short so that the audience doesn’t pick up on it.
Graham
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