I've never done this before, but try messing with the deformationTriggerRatio codes by changing the number. Code: ///taken from Roamer radiator "beams": [ ["id1:", "id2:"], {"beamType":"|NORMAL", "beamLongBound":1.0, "beamShortBound":1.0}, {"beamSpring":501000,"beamDamp":50}, {"beamDeform":1000,"beamStrength":"FLT_MAX"}, //radiator shape {"deformGroup":"radiator_damage","deformationTriggerRatio":0.02}, ["f1r","fr5l"], ["f1l","fr5r"], ["f1","fr5"], ["f4r","f4l"], //radiator crush {"deformationTriggerRatio":0.04}, Rising the number will probably make the radiator stronger.
You can raise the beamDeform number & as Godzilla said, the ratio. If you mean physically stronger, as in keep it to the frame, increase the beamStrength on the beams connecting the radiator to the frame.