Quote:
Originally Posted by Crazy Drew
Fix whatever burnt up and get a real tune. If I even saw anything near 14.59 afr on a turbo car I'd flip a shit, much less 19 under load, and wouldn't get back into boost until I got it tuned. I'm surprised it didn't pop sooner.
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Car's don't really run at 19:1 afr. That would feel like a fuel cut.
He didn't mention what his afr was at wot, which is what is important. He needs to give more info, but from what i read about those melted pistons it was definitely lean. If it did that with one 4th gear pull i'd guess his afr's were in the 14's at wot.
The leanest i could get my car to idle was at about 17-18:1 afr for reference. And leaning out past 15.5 afr at partial throttle results in torque loss.
The crazy bit is ignition timing at partial throttle can destroy a boosted setup faster than anything even when it doesnt' feel like you're blowing it up. too much ignition when hitting between atmospheric and 3'ish psi is probably the number 1 cause of most n/a to turbo setups blowing up. Tuner is lazy and thinks your'e just going to wot all the time, fucks up your timing map greatly in certain spots.