'23 Hellcat Cat Warmup/CSER

Does anybody know what tables need to be changed to eliminate the cold start cat warmup mode (negative timing and awful exhaust noise)? This car has longtubes and a full exhaust with no cats and it shreds ear drums on cold start. Tried adjusting the Start and Start Flare tables in the spark tab but no change.

Attachment 158927

Try:

Engine -> Fuel -> Temperature Control -> Cat Protection
Engine -> Spark -> Advance -> Minimum spark -> base

If you need remote support, email me.

I fixed it. There were also torque tables for cat warmup that I zero'd out

Quote:

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Originally Posted by Mucho_Boosto

I fixed it. There were also torque tables for cat warmup that I zero'd out

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This :)

Quote:

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Originally Posted by Mucho_Boosto

I fixed it. There were also torque tables for cat warmup that I zero'd out

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ECM 37855 and 37856?

Related to this topic ... anyone know if 34250 and 34260 are threshold values for COT and EOT enrichment enablement, or are these target values for desired cat and exhaust normal operating temperatures, thus if the real-time calculated temp is below these values, the PCM is doing things to try and raise the temps to hit the value stored in these tables?

dont forget 34252

i have a trick for all 3 of those tables

the solution is in modifying the axis... not the values of any of those tables cells

Quote:

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Originally Posted by Mucho_Boosto

I fixed it. There were also torque tables for cat warmup that I zero'd out

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Best tip of 2025. It sure cleaned up my tune.
Thank You.