Defo not FCD as I'm hitting the FC around 1.1bar I've just bought a second hand FCD. It's just labelled JAM, no mention of FCD and no adjuster on it, just a small black box with wires running to the ECU.
It's when the boost guage spikes, it glows the engine light for a few seconds then 'bang' limits. I wonder if it's a JAM FCD that's set low so allowing me past 0.8bar and when spiking to 1.1 it's allowing the FC to engage.