False Knock in 1.8 BBR turbo
 

I'm running a 1.8l engine, 320cc (soon to be 460cc) injectors, T25 turbo, adaptronic ecu.

I changed the ignition to closed loop and fuel map to rapid learn after changing to volumetric efficiency (VE) with my impending injector upgrade.

After switching from open loop to closed I started experiencing a huge flat spot between approx 4500rpm and 6000rpm and it would then pick up again at 6000rpm and pull normally to the redline.

I've read these engines are very noisy around this rpm band and want to know how to make sure its not real knock or detonation? And how do I work out the levels to let adaptronic know its not real knock and just surrounding noise.
I'd ideally like to run closed loop so the ecu can wind back the ignition if it experiences real knock.

Any thoughts guys?

Yes. Try posting this in the adaptronic section.

Have a great day,
Jared