Boat / Jet Ski
Johnson · J40 Outboard
815cc Four stroke EFI39hp
From 2009 · 2009 → present
Tuning gain
+4HP
+7Nm
Stock HP
39hp
Tuned HP
43hp
Stock Torque
57Nm
Tuned Torque
64Nm
Power curve
Horsepower
+4 hpStock
39
Tuned
43
Torque curve
Torque
+7 NmStock
57
Tuned
64
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 Johnson J40 Outboard 815cc Four stroke EFI39hp delivers a measured gain of +4 hp (39 → 43) and +7 Nm of torque (57 → 64). 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.
- ▸Possibly of minimize fuel consumption.