McLaren 720S ECU Tune — 870HP Stage 2 | Cost, Process & Gains Guide (2026)
Why the 720S Responds So Well to ECU Tuning
The McLaren 720S sits on the M840T — a 4.0-liter twin-turbo V8 that McLaren rates at 710 HP and 568 lb-ft from the factory. ECU tuning recalibrates boost pressure, air-fuel ratios, ignition timing, and torque management maps. The result is 800-870 WHP from the same hardware.