@Fobsta, you can disable shadow on the car model unchecking the shadow button in materials.
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Yes I know thank you 
After playing around with self shadowing objects I can understand why most games don’t have this feature and just cast a shadow on the floor.
I said in one of the first posts:
You select the child object, then the parent, and instead of doing CTRL+P asap, you enter edit mode, select a vertex, and then you press CTRL+P ( doing Vertex Parent )
As for self-shadowing, in fact most games don’t have it, but for example in Oblivion there is this feature…
Cya =)
@PadrePioX: Sorry, I din’t notice that:o thanks
@Fobsta: Maybe changing the Bias value in the spot lamp can help to reduce artifacts if you need or want self shadowing in your model.
Yes, you should use a very low bias always ( 0.5 or something, not extremely low or the shadow will not display correctly, but too high will make it imprecise )
Cya =)
the shadow bias is already very low. and it almost works. but every now and again a ‘thick black cloud’ runs across the the side of the vehicle
again thank you v much for your help and suggestions
could you post a picture or maybe a Blend showing the problem, if you want to keep your model you can replace it with something that shows the same problem, maybe we can take a look and see what the problem is.
I’ll try and upload the model tomorrow - but it’s huge at the moment 
here’s the problem
ouch :S thats bad
@ Jesusfreak
I could always create an invisible low poly LOD that just cast shadows. That’s what I did with my Dalek
Hi, sorry for the delay, I’ve tried to fix the problem in your scene, but the only way was how i made in your blend, here’s a link, take a look and tell me if this helped you http://www.mediafire.com/?mnn1jnf2zfg