I am new to tuning. Car is a 2004 Z06, dedicated road race track car. The drive train is stock from the paper air filter to the stock exhaust. The only modification was the removal of the catalytic converters. the car was professionally tuned. I am getting knock retard at the same point on the track on most laps and continues the entire way down the straight. I notice I am in 4th gear, 100% TPS, and AFR in the high 13s or low 14 using an AEM wideband:
9:51 4kr
11:15 & 12.29 ok
13:39 - 1.8 kr afr 13.9
14:57 & 16:06 OK
17:13 2.7KR sfr 14
18:35 ok but not 100% tps
19:35 2.7 kr 14 afr
I also notice that some of the KR settings have been changed
I am looking for help to make the tune safer. The more specific the advice can be , the better