Installing cat delete pipes c7z what changes are needed in the tune?

Hello, I'm new to HPTuners and the fourm. I have a 2016 Z06 A8. I mainly use the car for HPDE at the Autobahn country club. The car is stock besides an Akrapovic exhaust with a catless xpipe. It also has a DeWitts 57mm radiator and katech 174* thermostat.

I believe the main cats are clogged/melted and I'm installing afe cat delete pipes. I plan to put the stock o2 sensors into the pipes after the cats.

I don't have much experience with tuning and plan to have my car tuned by a local shop but I have a few trackdays that I don't want to miss before the car can be tuned. I've turned off AFM in the tune and plan to turn off COT too. What do I need to do so the after cat o2 sensors don't throw any codes. Also is there anything else I should change?

Thanks in advance :cheers:

You will need to disable the CEL codes for catalyst efficiency. Look at all the Bank 1 Sensor 2 and Bank 2 Sensor 2 codes. If you have a 174 degree thermostat you can adjust the fans to come on sooner and set the mechanical thermostat temp to 174 in the tune.

Disable catalyst warmup along with COT fueling

Engine Diag >DTCs

Everything that says bank 1 and bank 2 (Sensor 2) Set to No Error Reported and unclick the SES Enable arrow.

Here's a file that show the DTCs to change. It was a test file so only use the DTCs under Eng Diag

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Originally Posted by JnJSpdShop

Disable catalyst warmup along with COT fueling

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Ok, theres a min temp currently 63* below that cat warmup is disabled, and a max temp currently 109* above that cat warmup is disabled. Should I set the max temp to 63 or 64 to disable cat warmup entirely?

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Originally Posted by TriPinTaZ

You will need to disable the CEL codes for catalyst efficiency. Look at all the Bank 1 Sensor 2 and Bank 2 Sensor 2 codes. If you have a 174 degree thermostat you can adjust the fans to come on sooner and set the mechanical thermostat temp to 174 in the tune.

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I set the thermostat temp to 174 where do I set the fans to come on sooner? Would that be the desired ECT table? I went from 194 to 174 so is reducing those values by 20* a good place to start?

Should I also adjust the control by % table and the ignition off enable temp?

I drove the car before disabling anything to do with the rear o2 sensors. The only codes that popped up were p0420 and p0430 catalist efficiency codes. I turned them off in the tune and no more check engine lights. Should I turn off anything else relating to the rear o2 sensors or just leave it alone.

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Originally Posted by Edster

I drove the car before disabling anything to do with the rear o2 sensors. The only codes that popped up were p0420 and p0430 catalist efficiency codes. I turned them off in the tune and no more check engine lights. Should I turn off anything else relating to the rear o2 sensors or just leave it alone.

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You're fine just disabling cat efficiency.