Knock Thresholds for 18+ ZL1 with longtubes

[BC13]

Hi folks, any thoughts on the knock threshold values used in the image below (tune vs stock) for a 17+ ZL1 10spd with longtube headers and tune, no other mods? The tuner doubled the thresholds across the board (all rpm/airmass g) which seems like an excessive change for just headers, vs adjusting as/if needed per rpm and cylinder for header noise. Everything otherwise is reasonable in the timing tables for the tune that I saw.

Picture attached shows the tuned tables vs OEM for Cyl 8. Same thing was done on all cylinders. Transients and EQ Ratio were not modified. IAT/ECT/PE COT tables have lower values in the left axis than stock, likely to keep the car reasonable on timing so not concerned with the commanded timing, but we do want the car protected from knock well.

Thanks for your help in advance!


Comparison.png

[01SLPSSM6]

Post a file and datalog.

[TriPinTaZ]

I typically only increase the (0.4) airmass row to 5.000 maximum for Long Tubes on a bolt on LT4. I also increase the recovery rate a little bit. Some cars I do not increase the knock thresholds more than 10-15% but I always never increase any of the values beyond 5.0. I'm not saying I am right or wrong, but I just don't see a reason to increase them any further for a bolt on setup.

[BC13]

Attached logs and files. The auto mode bumps the rev limiter for some reason too.

[BC13]

Would you mind sending a tune file over with recommended thresholds? I can make those adjustments right away to keep it extra safe.