Don't follow Jim McLeans advice of restricting your hip turn plz! Its just pointless and does not provide more power.
Hey, If that was the case then I should be hitting 350 yard drives everytime as mine is as minimal as you can get because I have an extremely good flexability between upper and lower body(infact I could just about turn my chest fully and near enough not turn my lower body at all which is what I did for a long time). Whilst I am pretty powerful and can hit it as far as the average tour player it doesn't add power. I try to turn my lower body a bit more nowadays and am far better for it.