Vauxhall Signum 2004-2008 3.0 V6 CDTi 174bhp remap figures
Stock, this 2004-2008 Vauxhall Signum diesel (3.0L) produces 174bhp and 370Nm. Our expected figures for a Stage 1 remap are 210bhp and 452Nm, an expected gain of up to 36bhp and 82Nm.
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 | 174 bhp | 210 bhp | +36 bhp |
| Torque | 370 Nm | 452 Nm | +82 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 174 bhp | 370 Nm | |
| Stage 1Maximum software-only performance | 210 bhp | 452 Nm | +36 bhp +82 Nm |
| Stage 1 EcoPerformance with economy in mind | 201 bhp | 445 Nm | +27 bhp +75 Nm |
| Eco mapEconomy first | 198 bhp | 441 Nm | +24 bhp +71 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 Signum
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 Denso 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 Vauxhall Signum 3.0 V6 CDTi 174bhp?
We expect 210bhp and 452Nm against 174bhp and 370Nm as standard: up to +36bhp and +82Nm. 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 Vauxhall Signum 3.0 V6 CDTi 174bhp?
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: 201bhp and 445Nm expected. The Eco map is economy first: 198bhp and 441Nm. Both still sit above the standard 174bhp and 370Nm.
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 Vauxhall Signum figures
Other diesel variants
- 3.0 V6 CDTi 181bhp 2004-2008
- 1.9 CDTi 150bhp 2004-2005
- 1.9 CDTi 150bhp 2006-2008
- 1.9 CDTi 120bhp 2004-2006
- 1.9 CDTi 120bhp 2006-2008
All diesel Signum variants · Signum 2004-2008 overview · All Vauxhall figures