Backfiring under boost

[NissanTurboSix]

I back fire like CRAZY when I hit boost at more than 1/2 throttle or so. I have NO boost leaks. My IC is air tight.

I have GReddy Profec B II and FMIC. I am getting vac. source from the IC pipe closest to the throttle body.

I think the problem might lie within the setting of my boost controller because when I play with the settings it seems to get worse. The only problem is, I can't seem to get it better.

If you think its Profec B, can you post some settings that should work as a baseline?

If you think its something else, please share! Thanks.

[themadscientist]

sounds like weak ignition misfiring. See if it goes away when you drop the boost. Check the coils and plugs for health.

[NissanTurboSix]

Boost is set at 0%. Ill take a look at ignition. Thanks for the reply