Vauxhall Astra (H) 2004-2010 1.7 CDTi 108bhp remap figures
Thinking of remapping a Vauxhall Astra 1.7 CDTi 108bhp? The standard car makes 108bhp and 260Nm; with a Stage 2 remap from our Leicester workshop we expect around 175bhp and 400Nm, up to +67bhp and +140Nm.
Choose your map
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 | 108 bhp | 175 bhp | +67 bhp |
| Torque | 260 Nm | 400 Nm | +140 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 108 bhp | 260 Nm | |
| Stage 2Extra power with supporting parts | 175 bhp | 400 Nm | +67 bhp +140 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, an upgraded intercooler and a less restrictive exhaust. 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 Astra
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.
The ECU recorded for this variant is a Denso. 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 Astra 1.7 CDTi 108bhp?
We expect 175bhp and 400Nm against 108bhp and 260Nm as standard: up to +67bhp and +140Nm. 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 Astra 1.7 CDTi 108bhp?
Stage 2 assumes supporting hardware. For an engine like this that is typically a freer-flowing intake, an upgraded intercooler and a less restrictive exhaust. 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 Astra figures
Other diesel variants
- 1.7 CDTi 98bhp 2004-2010
- 1.9 CDTi 120bhp 2004-2006
- 1.9 CDTi 120bhp 2007-2010
- 1.3 CDTi 88bhp 2004-2010
- 1.7 CDTi 79bhp 2004-2010
- 1.9 CDTi 150bhp 2004-2006
- 1.9 CDTi 150bhp 2007-2010
All diesel Astra (H) variants · Astra (H) 2004-2010 overview · All Vauxhall figures