Suzuki’s factory calibration for the 2008 Grand Vitara 1.9 DDiS on Bosch EDC16C39 leaves wide control margins that blunt throttle response and limit sustained boost. This combined Stage 1 & Stage 2 package carefully re-profiles the torque model, fuel-quantity and rail-pressure ramps, lifts turbo duty ceilings and reshapes smoke limit matrices to unlock a more linear, eager delivery across the entire operating range. Diagnostic routines for temperature, airflow and sensor plausibility remain active, ensuring the ECU’s built-in failsafes intervene if mechanical limits are approached. Stage 2 additionally disables diesel particulate-filter routines, reconfigures post-injection scheduling and suppresses related fault monitors, allowing reliable operation after DPF removal without triggering warning lights. Altitude, cold-start and clutch-torque protections are preserved for OEM-grade durability, so daily drivability and long-haul reliability stay intact while the engine breathes freer and responds more promptly to driver input.