Boat / Jet Ski
Mercury Marine · QSD
4.2 350350hp
From 2000 · 2000 → present
Tuning gain
+70HP
+146Nm
Stock HP
350hp
Tuned HP
420hp
Stock Torque
704Nm
Tuned Torque
850Nm
Power curve
Horsepower
+70 hpStock
350
Tuned
420
Torque curve
Torque
+146 NmStock
704
Tuned
850
Power & torque curves
Illustrative · interpolated from peak values- Stock HP
- Stock Nm
- Tuned HP
- Tuned Nm
Available tuning options· Chiptuning
stage 1vmax
About this tune
DynoVault's Stage 1 chiptuning for Mercury Marine QSD 4.2 350350hp delivers a measured gain of +70 hp (350 → 420) and +146 Nm of torque (704 → 850). The ECU file is custom-mapped per variant and tested against the original safety margins for boost, fueling, and EGT. Available with a lifetime tune warranty and optional fuel-economy mode.
Benefits
- ▸Custom file guarantee.
- ▸It may minimize fuel consumption.