Alfa Romeo 166 1999-2005 2.4 JTD 20v 175bhp remap figures
The Alfa Romeo 166 2.4 JTD 20v 175bhp (1999-2005) is a diesel 2.4L model making 175bhp and 385Nm as standard. After a Stage 1 ECU remap we expect 235bhp and 495Nm - up to 60bhp and 110Nm 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 | 175 bhp | 235 bhp | +60 bhp |
| Torque | 385 Nm | 495 Nm | +110 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 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 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 questions
How much power does the Stage 1 map give the Alfa Romeo 166 2.4 JTD 20v 175bhp?
We expect 235bhp and 495Nm against 175bhp and 385Nm as standard: up to +60bhp and +110Nm. 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 Alfa Romeo 166 2.4 JTD 20v 175bhp?
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: 220bhp and 486Nm expected. The Eco map is economy first: 215bhp and 481Nm. Both still sit above the standard 175bhp and 385Nm.
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