Scania R420 2004> 11.7l EUR 3 DC 12 14 - HPI 420bhp remap figures
The Scania R420 11.7l EUR 3 DC 12 14 - HPI 420bhp (2004>) is a diesel 11.7L model making 420bhp and 2100Nm as standard. After a Stage 1 ECU remap we expect 485bhp and 2376Nm - up to 65bhp and 276Nm more than stock.
Choose your map
Stage 1 remap figures
A Stage 1 remap is a software-only change to the ECU on an otherwise standard car. It needs no extra parts, which makes it the usual starting point.
| Stock | Vanguard expected | Expected gain, up to | |
|---|---|---|---|
| Power | 420 bhp | 485 bhp | +65 bhp |
| Torque | 2100 Nm | 2376 Nm | +276 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 map for?
- Drivers who want stronger pulling power for overtaking, hills and towing, with no parts to fit.
- Daily and motorway drivers who want the engine to feel less strained at cruising speed.
- Anyone who wants the biggest software-only change we list for this engine.
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 questions
How much power does the Stage 1 map give the Scania R420 11.7l EUR 3 DC 12 14 - HPI 420bhp?
We expect 485bhp and 2376Nm against 420bhp and 2100Nm as standard: up to +65bhp and +276Nm. These are expected figures, and we confirm what is achievable on your own car after a diagnostic check.
Does a Stage 1 remap need any extra parts on the Scania R420 11.7l EUR 3 DC 12 14 - HPI 420bhp?
No. Stage 1 is a software-only change to the ECU on an otherwise standard car.
Is there a gentler map than Stage 1 for this engine?
Yes, two. Stage 1 Eco is performance with economy in mind: 469bhp and 2354Nm expected. The Eco map is economy first: 464bhp and 2340Nm. Both still sit above the standard 420bhp and 2100Nm.
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