Quote:
Originally Posted by GRUF78
For the tuning gurus out there....Datalogged the car for about 10 mins briefly.
Tuner had the following comments:
Bank 1 (Drivers side) is showing signs of over fueling on decel. When the engine goes into decel both banks go rich briefly followed by bank 2 going back to normal while bank 1 stays in an enrichment state.
You can see bank 1 (circled in yellow) is adding 14.8% fuel while bank 2 (circled in red) is subtracting 0.8%. These should really be following each other. You can see this in the graph section (circled in pink). Bank 1 (purple) flatlines at 908 millivolts while bank 2 (light blue) falls back into the closed loop oscillation sequence.
I can't really put my finger on what causes this but I can say it's not normal. I tune 5-6 of these weekly and never see this type of behaviour.
Thoughts?
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I am not sure if this helps but I had a similar experience tracking my ZL1 at COTA. I arrived with close to 3/4 tank of fuel and had to fill up 2 more times for 5 20-minute sessions. I also have the AWE touring (no resonators). My reflectors on my diffuser disintegrated after the second session. The license plate lights went from flat to drooping. the Chevrolet emblem on the trunk was deformed and both taillights have signs of warpage. 1 day after the track day my engine check light came on indicating an issue on bank 1 (Catalyst System below threshold Bank 1). The dealer tried to address the issue 3 times. 1- replaced O2 senser, 2- Replaced Cat, 3- replaced clamp to cat (all bank 1). Every time I got my car back the problem returned within 5 miles of driving. I took it to a local muffler shop and had the exhaust to cat welded. No more engine check light since. To be safe I also moved the 4'5" exhaust tips as far aft as possible. All melted parts have been replaced. I have not been back to the track since but hoping for a better outcome next time.