Scania R420 2004> 11.7l EUR 3 DC 12 14 - HPI 420bhp Stage 1 Eco remap figures
The Stage 1 Eco map for the Scania R420 11.7l EUR 3 DC 12 14 - HPI 420bhp (2004>): 469bhp and 2354Nm expected from a standard 420bhp and 2100Nm, up to +49bhp and +254Nm. It keeps most of the Stage 1 gain (Stage 1 is 485bhp and 2376Nm) and is tuned with economy in mind: the choice if you want the performance and care what each tank costs.
Choose your map
Stage 1 Eco remap figures
Stage 1 Eco is performance with economy in mind. It keeps most of the Stage 1 gain, so the car still pulls well, but the map is shaped for efficient, relaxed driving rather than flat-out output. It is above the standard figures. We don't quote mpg, because economy depends on the car and how it is driven.
| Stock | Vanguard expected | Expected gain, up to | |
|---|---|---|---|
| Power | 420 bhp | 469 bhp | +49 bhp |
| Torque | 2100 Nm | 2354 Nm | +254 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 420 bhp | 2100 Nm | |
| Stage 1Maximum software-only performance | 485 bhp | 2376 Nm | +65 bhp +276 Nm |
| Stage 1 EcoPerformance with economy in mind | 469 bhp | 2354 Nm | +49 bhp +254 Nm |
| Eco mapEconomy first | 464 bhp | 2340 Nm | +44 bhp +240 Nm |
Who is the Stage 1 Eco map for?
- Drivers who want the pull of a remap for overtaking, motorways and towing, with the engine tuned with economy in mind.
- High-mileage drivers who want better performance and a more efficient everyday car in one map.
- Anyone who would otherwise take full Stage 1 but cares what each tank costs.
How Stage 1 Eco compares with Stage 1
Full Stage 1 on this Scania R420 is expected to give 485bhp and 2376Nm (+65bhp, +276Nm). The Stage 1 Eco keeps about 75% of that power gain and 92% of the torque gain, so you get 469bhp and 2354Nm: 16bhp less and 22Nm less than Stage 1, with the map shaped for efficient, relaxed driving, so it suits you if you want the pull and care about running costs. Both sit above the standard 420bhp and 2100Nm.
What this means for your R420
On a diesel the biggest change is normally torque: the remap changes how much fuel and boost the ECU allows across the rev range, so pulling power arrives earlier and holds on longer.
Engine management is by a Motorola EMS S6 unit. Older engine management is simpler to work with, but age matters: worn sensors, leaks and tired components can hold back what a remap delivers, which is why we run a diagnostic check first.
We remap at our Belgrave Gate workshop in Leicester, or at your home or work within 30 miles, and every job starts with a diagnostic check.
Please note: these are expected figures, not guarantees. Real results vary with the condition of the vehicle, the ECU software version, fuel quality and the hardware fitted. Some options - including Stage 2 and anything that needs extra hardware - are for off-road or competition use only. We check every vehicle first and confirm what is achievable before any work starts.
Figures reviewed 22 October 2026.
Stage 1 Eco questions
How much power does the Stage 1 Eco map give the Scania R420 11.7l EUR 3 DC 12 14 - HPI 420bhp?
We expect 469bhp and 2354Nm against 420bhp and 2100Nm as standard: up to +49bhp and +254Nm. These are expected figures, and we confirm what is achievable on your own car after a diagnostic check.
How does Stage 1 Eco differ from Stage 1 on this engine?
Full Stage 1 is expected to give 485bhp and 2376Nm. Stage 1 Eco gives 16bhp less and 22Nm less, in exchange for a map shaped with economy in mind. It still sits above the standard figures.
Is Stage 1 Eco or the Eco map better for me?
Choose Stage 1 Eco if you want the performance (469bhp and 2354Nm) and still care about running costs. Choose the Eco map (464bhp and 2340Nm) if economy matters more than pace.
Will the Stage 1 Eco map save fuel?
It is tuned with economy in mind while keeping most of the Stage 1 performance. We do not quote mpg figures, because economy depends on the car, its condition and how it is driven.
Do I need to tell my insurer about a remap?
Yes. A remap is a modification, so you should declare it to your insurer.
More Scania R420 figures
Other diesel variants
All diesel R420 variants · R420 2004> overview · All Scania figures