Vauxhall Signum 2004-2008 2.8T V6 226bhp remap figures
Stock, this 2004-2008 Vauxhall Signum petrol (2.8L) produces 226bhp and 330Nm. Our expected figures for a Stage 2 remap are 315bhp and 459Nm, an expected gain of up to 89bhp and 129Nm.
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Stage 2 remap figures
Stage 2 builds on Stage 1 with supporting hardware - typically a freer-flowing intake and exhaust or downpipe - and a remap written around those parts. Stage 2 is intended for off-road or competition use.
| Stock | Vanguard expected | Expected gain, up to | |
|---|---|---|---|
| Power | 226 bhp | 315 bhp | +89 bhp |
| Torque | 330 Nm | 459 Nm | +129 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 226 bhp | 330 Nm | |
| Stage 2Extra power with supporting parts | 315 bhp | 459 Nm | +89 bhp +129 Nm |
Who is the Stage 2 map for?
- Owners who have fitted, or plan to fit, supporting parts such as a freer-flowing intake and exhaust.
- Enthusiast, track and competition cars: Stage 2 is intended for off-road or competition use.
- Drivers who accept that a bigger gain means more of the car has to be checked and prepared first.
What Stage 2 needs
Stage 2 is written around supporting hardware. For an engine like this one that is typically a freer-flowing intake and a less restrictive exhaust, with the engine in good mechanical order. We confirm the exact parts for your car before any work starts.
- A diagnostic check and a read of your ECU come first.
- We look at the condition of the parts that will carry the extra power before we quote.
- Stage 2 is intended for off-road or competition use.
What this means for your Signum
Naturally aspirated petrol engines have no boost to raise, so gains from software alone are more modest than on a turbocharged car and come from fuelling, ignition and throttle response.
This car is listed with a Bosch ME9.6 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 2 questions
How much power does the Stage 2 map give the Vauxhall Signum 2.8T V6 226bhp?
We expect 315bhp and 459Nm against 226bhp and 330Nm as standard: up to +89bhp and +129Nm. These are expected figures, and we confirm what is achievable on your own car after a diagnostic check.
What does a Stage 2 remap need on the Vauxhall Signum 2.8T V6 226bhp?
Stage 2 assumes supporting hardware. For an engine like this that is typically a freer-flowing intake and a less restrictive exhaust, with the engine in good mechanical order. We confirm the exact parts for your car before any work starts.
Is Stage 2 for road use?
Stage 2 is intended for off-road or competition use. Tell us how the car is used and we will explain what we can and cannot do for it.
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 petrol variants
All petrol Signum variants · Signum 2004-2008 overview · All Vauxhall figures