Alfa Romeo 166 1999-2005 2.4 JTD 20v 175bhp Stage 1 Eco remap figures
The Stage 1 Eco map for the Alfa Romeo 166 2.4 JTD 20v 175bhp (1999-2005): 220bhp and 486Nm expected from a standard 175bhp and 385Nm, up to +45bhp and +101Nm. It keeps most of the Stage 1 gain (Stage 1 is 235bhp and 495Nm) 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 | 175 bhp | 220 bhp | +45 bhp |
| Torque | 385 Nm | 486 Nm | +101 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 175 bhp | 385 Nm | |
| Stage 1Maximum software-only performance | 235 bhp | 495 Nm | +60 bhp +110 Nm |
| Stage 1 EcoPerformance with economy in mind | 220 bhp | 486 Nm | +45 bhp +101 Nm |
| Eco mapEconomy first | 215 bhp | 481 Nm | +40 bhp +96 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 Alfa Romeo 166 is expected to give 235bhp and 495Nm (+60bhp, +110Nm). The Stage 1 Eco keeps about 75% of that power gain and 92% of the torque gain, so you get 220bhp and 486Nm: 15bhp less and 9Nm 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 175bhp and 385Nm.
What this means for your 166
Diesel remaps work mainly on boost pressure, fuel delivery and torque limiters, which is why the Nm gain is usually the figure you feel in everyday driving, particularly when overtaking or towing.
This car is listed with a Bosch EDC16C8 engine control 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 Alfa Romeo 166 2.4 JTD 20v 175bhp?
We expect 220bhp and 486Nm against 175bhp and 385Nm as standard: up to +45bhp and +101Nm. 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 235bhp and 495Nm. Stage 1 Eco gives 15bhp less and 9Nm 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 (220bhp and 486Nm) and still care about running costs. Choose the Eco map (215bhp and 481Nm) 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 Alfa Romeo 166 figures
Other diesel variants
All diesel 166 variants · 166 1999-2005 overview · All Alfa Romeo figures