Rate the Tune That Cracked My Piston
 

I've been running this tune for ~6 months without any issues -- until last week. I was at ~3k RPM on the highway when the car died on me. I just pulled the head off and found that a large chunk of piston #2 broke off and I suspect detonation was the cause despite the fact that I never heard any knock or pinging. I tuned the car myself and it is almost certainly a shit poor tune so I'd like some input so I can figure out what I'm doing wrong. I plan on rebuilding the motor with forged internals assuming that the block is recoverable and want to make sure a shit tune doesn't ruin another (much nicer) motor. I added my tune as well as a couple of logs I took while I was tuning my EBC, target was 12 psi, never got it to hover there perfectly before it blew up :/. Thanks in advance!

Which engine, what fuel?

Bone stock 1.8, only 91 octane since being turbocharged.

Im no pro, but your tune doesn't look too bad to me. Looks similar to what I run on a stock 1.8 on 12psi. I do run 93 octane though, not sure if that's a difference maker that the level of boost your at though. This makes me a little nervous about running 12-13 psi on mine. Did you do a hard pull right before it died at 3k rpm? Seems weird to go while just cruising at that rpm.

I did a 20-60 pull onto the highway about 5 minutes before it went out, but I didn't notice any odd noises and it ran perfectly right up until it died. I have no idea how I didn't hear a chunk of my piston fracturing off and bouncing around the combustion chamber... I also never actually found a significant amount of metal anywhere in the cylinder, head, intake, or turbo, plus the turbine blades look perfectly fine -- like no metal has ever passed through them. I'm still a little baffled. I'm tempted to just chalk it up as an old car and a bad tank of gas, but I'd really like to make sure my tune is bulletproof before I throw together a forged engine so thanks for looking!

Dunno what to say. But, for the next engine run a stock nb knock sensor.

I plan on building mine forged in the future too. Please post your build and updates!

You said in your other thread that your cam timing was off, and you were going to post pics. Where are they? Have you pulled the pistons out yet? I'm curious to see the ring lands.

I just posted them. TLDR: both cams were off by 2 teeth. I havent had time to pull the motor and get the pistons out yet, gotta find somewhere that I can work on the car long-term before I start tearing the rest apart.