You're probably not going to want to hear this, Norbs, but you made me curious about what might happen if I were to fix the liquid intercooler and just run plain water in it. No icing. I ran the sim using 80% intercooler eff and a turbine nozzle diameter of 2.3". Stroke is still 3.06". The output was 1,565 bhp by 8000 rpm. This is assuming that the advertised rating of the compressor (1650 hp) is accurate.