I'm trying to change the tier of the semifluid generator and can't find a way to do it, which I seem to remember was possible in ic2 exp

The machine doesnt have a tier, because each fuel generates a variable eu per tick, ie some fuels generate 8eu per tick, while others can be 16, or 100, or whatever. there is a config option in ic2 to offset the base value though - and boost/lower it to your choosing. which could make it more MV, or HV level.

I:energyGeneratorLiquid=100

I changed the base value to 2048, but it still shows the output tier in top as 1 and only outputs 32 eu/tick

@flyingperson23 not a bug. IC2 Generators have a fixed output. (Even IC2Exp has that feature) the only difference that you can see here is that you have a very long lasting fuel.

And this is not going to change. It stays like it is.