Quote Originally Posted by linni View Post
First, overall safety regulations from at least two decades back demand to have relay/cutoff in power circuit of the heating of the screens. Not to cause overheating / fire.

Second, if you have had heated windscreen on your car once, you cannot justify the misted windscreens of most of the WRC1 drivers from last night. Just cannot happen.

Third, remeber some times ago Ott to mention about lack of any demister. Believe it was during Hyundai times.
1. In modern Rally1/Rally2 there are no any extra relays, etc. Only master switch. Everything else is managed by power modules (which have kind of software relays/fuses, etc).
2. Yes, I have heated windscreen in my car. But I don't have 900degC exhaust temp in my car, also not 50+degC inside in my car and I'm not driving throught the water like rally guys. Also no roof vent, no bonnet openings, etc in my car. And that is all what makes the difference.
3. Depending on weather conditions you install or remove internal heat exchangers but blowers and heated windscreens are always mounted in the Rally1/2 cars.