Just another question, where the graph ends, is that where your limiter comes in? Compare your's to mine, It doesn't show the boost, but between 4K and 5K things really start happening very fast, and judging by the gauge, when I have the nerve to watch it, boost is already 8psi by 5k. Strangely this only shows up to 7K, but my limiter comes in at 7.5K.

Thought of another idea, instead of using only a boost controlling/er tap, you also have one that only opens at a certain pressure. I'm at a loss of words to what they are called, but we used to install them on the Serdi head/seat machines. My idea is basically to have one of these before the boost tap, which say only opens at 7.5psi, then the boost tap can control the boost from there onwards. What this will do is to not let the waste gate start opening at all, until right before it should. For this to work, you will need a big/gish waste gate, otherwise you might experience boost spikes, and depending on your state of tune, this might kill your engine.

What do the rest think of this idea?

I'm glad that it's not only my curve that has such a sharp drop of right at the end. I haven't taken the car to any timed events yet, but there is a big one coming up in the town(now declared a city) where I grew up. So I'll be taking it there, and having a bash at it.

Also want to take it for a power run on the dyno beforehand, and possibly push the pressure up t0 1 bar. Every one I speak to says I'm being conservative running it at 0.8, so I'll see what the dyno guy has to say about that...