Pre-compressor injection: could it induce surge?

[JohnA]

I find pre-compressor injection to be an interesting idea.
The possibility of making the compressor (under boost) act as if it is a bigger one, is just something that captures my imagination.
No need for a hybrid, just stick a nozzle.
The fact that reliability may also be enhanced, makes it even more compelling.

I'm already running a turbo with a big compressor (so it can sustain high boost without the turbo shaft overspinning)
With the pre-compressor injection the turbo feels different. Weird, as if it is close to the surge line. Well, maybe it is - after all, wouldn't this be expected from an abnormally large compressor? (compared to the turbine of course)

Any ideas? :?: