Vauxhall Astra (J) 2009-2016 1.7 CDTi 128bhp remap figures
The Vauxhall Astra 1.7 CDTi 128bhp (2009-2016) is a diesel 1.7L model making 128bhp and 300Nm as standard. After a Stage 1 ECU remap we expect 175bhp and 391Nm - up to 47bhp and 91Nm 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 | 128 bhp | 175 bhp | +47 bhp |
| Torque | 300 Nm | 391 Nm | +91 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 128 bhp | 300 Nm | |
| Stage 1Maximum software-only performance | 175 bhp | 391 Nm | +47 bhp +91 Nm |
| Stage 1 EcoPerformance with economy in mind | 163 bhp | 384 Nm | +35 bhp +84 Nm |
| Eco mapEconomy first | 159 bhp | 379 Nm | +31 bhp +79 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
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 /Delco E87 engine control unit. We read the ECU on your car and compare it with the software listed here before any work starts, so you know what to expect before you commit.
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 128bhp?
We expect 175bhp and 391Nm against 128bhp and 300Nm as standard: up to +47bhp and +91Nm. 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 128bhp?
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: 163bhp and 384Nm expected. The Eco map is economy first: 159bhp and 379Nm. Both still sit above the standard 128bhp and 300Nm.
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 123bhp 2009-2016
- 1.6 CDTi 134bhp 2014>
- 1.6 CDTi 108bhp 2014>
- 1.7 CDTi 108bhp 2009-2016
- 2.0 CDTi 157bhp 2009-2011
- 2.0 CDTi 162bhp 2012-2016
- 1.3 CDTi 93bhp 2009-2016
- 2.0 CDTi 192bhp 2012-2016
All diesel Astra (J) variants · Astra (J) 2009-2016 overview · All Vauxhall figures