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SSSoon · 09-08-2014, 03:07 PM

Well, here we go. Looks like melted cats were root cause. I'll be damned if I can list any symptoms that I should have noticed that pointed to cats as the cause, though: no codes thrown (misfire, etc), no lugging or choking on acceleration, no rough idle, nothing. The only symptom set happened only at 5000 RPM at WOT: Stabilitrack going nuts, a rapid banging noise, and boot gauge suddenly going wild. All disappeared when I got off the gas.

I knew that even high flow cats are a risk with a supercharged engine, but thought that for sure I would have been able to feel a choking engine long before anything really bad happened. Kinda feel like an idiot, like I SHOULD have been to tell. Ah well.

I guess the other clue was last July at VIR when I could only hit 135 on the back stretch instead of 145. But it was high 90's and end of the day, so I figured heat soak...

09-08-2014, 03:07 PM	#21
SSSoon Drives: RY 2011 2SS A6 Join Date: Jul 2010 Location: Virginia Posts: 997	Root cause Well, here we go. Looks like melted cats were root cause. I'll be damned if I can list any symptoms that I should have noticed that pointed to cats as the cause, though: no codes thrown (misfire, etc), no lugging or choking on acceleration, no rough idle, nothing. The only symptom set happened only at 5000 RPM at WOT: Stabilitrack going nuts, a rapid banging noise, and boot gauge suddenly going wild. All disappeared when I got off the gas. I knew that even high flow cats are a risk with a supercharged engine, but thought that for sure I would have been able to feel a choking engine long before anything really bad happened. Kinda feel like an idiot, like I SHOULD have been to tell. Ah well. I guess the other clue was last July at VIR when I could only hit 135 on the back stretch instead of 145. But it was high 90's and end of the day, so I figured heat soak... Attached Images __________________ Dry sump LS7, cage, JPSS suspension, Wilwood brakes, fire suppression, ARH 3" headers/exhaust, Z/28 DSSV coilovers, Kirkey seats, TeamTech 6-point harnesses, 19" Forgeline GA3R, 325/30R19 Re11 tires, oil cooler, monster JPSS splitter/wickerbill, CAI, brake ducts.