Quote Originally Posted by br21 View Post
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.
You kind of controversing, having 900 deg C and 50 deg C in the cabin at the same time.
But definitely it`s an interesting topic. Needs some further investigation.
Will find out and be back.

Still, have seen temp differences in lots of rally cars in Scandinavian climate, nothing familiar with this.