Vauxhall Astra (H) 2004-2010 1.7 CDTi 79bhp remap figures
The Vauxhall Astra 1.7 CDTi 79bhp (2004-2010) is a diesel 1.7L model making 79bhp and 170Nm as standard. After a Stage 1 ECU remap we expect 149bhp and 310Nm - up to 70bhp and 140Nm 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 | 79 bhp | 149 bhp | +70 bhp |
| Torque | 170 Nm | 310 Nm | +140 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 79 bhp | 170 Nm | |
| Stage 1Maximum software-only performance | 149 bhp | 310 Nm | +70 bhp +140 Nm |
| Stage 1 EcoPerformance with economy in mind | 132 bhp | 299 Nm | +53 bhp +129 Nm |
| Eco mapEconomy first | 126 bhp | 292 Nm | +47 bhp +122 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 Astra
On a diesel the biggest change is normally torque: the remap changes how much fuel and boost the ECU allows across the rev range, so pulling power arrives earlier and holds on longer.
This car is listed with a Bosch EDC16C9 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 Astra 1.7 CDTi 79bhp?
We expect 149bhp and 310Nm against 79bhp and 170Nm as standard: up to +70bhp and +140Nm. 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 Astra 1.7 CDTi 79bhp?
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: 132bhp and 299Nm expected. The Eco map is economy first: 126bhp and 292Nm. Both still sit above the standard 79bhp and 170Nm.
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
- 1.3 CDTi 88bhp 2004-2010
- 1.7 CDTi 98bhp 2004-2010
- 1.7 CDTi 108bhp 2004-2010
- 1.9 CDTi 120bhp 2004-2006
- 1.9 CDTi 120bhp 2007-2010
- 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