I know this is a longshot, but I know nothing about tuning and just got yet another cracked ringland on my freshly rebuilt ka-t running only 8-9psi. It was running 14-16psi when originally tuned but handled it great until I blew the headgasket and kept driving because I thought it was just air in the system. This last instance, the motor was freshly rebuilt with new rings and bearing. I compression tested it a month ago, 750 miles in and it made 190psi across the board. Last night I drove to a friends, didn't beat on it or anything, and when I went to leave I immediately noticed it sounded down a cylinder while turning over. Sure enough, I tested it today and it made 190-185-190-115. I've suspected my tune my be an issue, but it ran absolutely fine with no detonation or knock. I also figured by lowering the boost I wouldn't have an issue.
So, rambling aside, I plan to have it retuned once fixed, but I'm really curious to know if my timing is too aggressive or if there's anything that stands out on my Nismotronic tune. My setup is stock ka, STI 525cc injectors, twisted motion 2871 turbo, speed density, and typical bolt ons. Thanks in advance.
My Tune