Rate the Tune That Cracked My Piston
#1
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 **** 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 **** 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!
Last edited by intenseapple; 05-13-2020 at 12:30 AM.
#4
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.
#5
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.
#8
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!
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