Heres my story:
I have a 2006 hhr 2.4, installed a turbo from a saab 9-3. Ran that for a couple years at 10 psi, no issues. My maf recently pooped out on me, and I've been running a sd tune now. Now about 2 months ago, I decided I'll run a compound turbo setup with a .50 turbo a buddy had laying around. I have messed with the setup about a hundred times now, exhaust, etc. And recently I've been getting kr around 10 to 15 psi. Had no issues running up to 20 psi for a while. I'm on stock everything internal. I have valve springs, valves, cams, head studs, and neutral balance shafts ready to go in - just waiting on time to do so.
Anyone wanna peek at the following log and see if they think this is false kr or if it's something going poop on me?
Other than that, I'm excited to make my hhr do naughty things in the near future, and hpt has been my baby.