Smoke sim scale way off

Hi there,

I trying my hand at smoke simulation.
Everthing seems to work at adverticed, in a simple test scene.

But in some cases the smoke and fire just comes out in huge blobs, several time bigger than the emitter.
It’s like the smoke got scaled up compared to the rest.

Has anyboddy seen this before, and knows whats wrong?

I got a bit further,

It seems like the smoke and fire simulation is scaled to the domain.
But it does not take into account the real size of the domain.
So if your domain is 1km x 1km x 1km the fire still behaves like the domain was something like 10m x 10m x 10m.

Does anyboddy know a way to controll this?