pulsing texture

i converted a rim from another game (Crysis 2) to work on a car. but the texture becomes dark and turns lighter again when it spins.

does anyone know how this could happen?
some pics.


material.cs code

Code:

singleton Material(cry_rim_1)
{
    mapTo = "cry_rim_1";
    diffuseMap[1] = "vehicles/D-Troxx_Addon_coupe/Wheels/cry_rim_1_d.png";
    specularMap[1] = "vehicles/common/null.dds";
    normalMap[1] = "vehicles/D-Troxx_Addon_coupe/Wheels/cry_rim_1_n.png";
    diffuseMap[0] = "vehicles/common/null.dds";
    specularMap[0] = "vehicles/common/null.dds";
    normalMap[0] = "vehicles/D-Troxx_Addon_coupe/Wheels/cry_rim_1_n.png";
    specularPower[0] = "128";
    pixelSpecular[0] = "1";
    specularPower[1] = "32";
    pixelSpecular[1] = "1";
    materialTag0 = "beamng"; materialTag1 = "vehicle";
    diffuseColor[0] = "1 1 1 1";
    diffuseColor[1] = "1.5 1.5 1.5 1";
    useAnisotropic[0] = "1";
    useAnisotropic[1] = "1";
    castShadows = "1";
    translucent = "1";
    translucentBlendOp = "None";
    alphaTest = "0";
    alphaRef = "0";
    dynamicCubemap = true; //cubemap = "BNG_Sky_02_cubemap";
};

might this be the cause of the converted 3d model?

 

Values in colours shouldn't exceed 1, so I'd guess it's the "1.5 1.5 1.5 1" for diffuseColor[1].

 

thats original material settings i just copied. they can exceed 1.

 

I thought that at first too so i removed the normal map, but nothing changed, also with the specular map removed.