The paper presents an analysis of indicators of a high-performance W12 twin-turbo engine used in drifting applications, supplemented with time-series data on engine parameters. The tests were conducted on a chassis dynamometer using indicating and data logging equipment. The engine external characteristics were deter-mined, yielding 898 kW and 1488 Nm. To enable safe in-cylinder pressure measurements, the turbocharger boost control duty cycle was limited to 30%, resulting in reduced thermodynamic loading without compromis-ing the representativeness of the combustion process. The 450 consecutive operating cycles were recorded under transient conditions. Under full-load conditions, the average MBF50 = 13.8°CA and COV(MBF50) = 17.3%, indicating conservative phasing relative to MBT and significant cycle-to-cycle variability. It was demonstrated that indexing enables precise correlation of transient parameters with combustion evolution and is an effective tool for optimizing the calibration of high-performance engines.