Vauxhall Astra (J) 2015> 1.4 16v Turbo 123bhp remap figures
Thinking of remapping a Vauxhall Astra 1.4 16v Turbo 123bhp? The standard car makes 123bhp and 245Nm; with a Stage 1 remap from our Leicester workshop we expect around 160bhp and 303Nm, up to +37bhp and +58Nm.
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 | 123 bhp | 160 bhp | +37 bhp |
| Torque | 245 Nm | 303 Nm | +58 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 123 bhp | 245 Nm | |
| Stage 1Maximum software-only performance | 160 bhp | 303 Nm | +37 bhp +58 Nm |
| Stage 1 EcoPerformance with economy in mind | 151 bhp | 298 Nm | +28 bhp +53 Nm |
| Eco mapEconomy first | 148 bhp | 295 Nm | +25 bhp +50 Nm |
Who is the Stage 1 map for?
- Drivers who want a noticeably quicker car from a software-only change, with no new parts.
- Daily drivers who want stronger mid-range pull and a sharper throttle.
- Anyone who wants the biggest gain we list without fitting hardware.
What this means for your Astra
Turbocharged petrol engines respond well to calibration changes: boost and timing are the main levers, and the result is a flatter, stronger torque curve as well as a higher peak.
Engine management is by a Delco E78 unit. Newer ECUs often protect their software, so we read the exact unit and version on the car before confirming the figures on this page.
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 1.4 16v Turbo 123bhp?
We expect 160bhp and 303Nm against 123bhp and 245Nm as standard: up to +37bhp and +58Nm. 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 1.4 16v Turbo 123bhp?
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: 151bhp and 298Nm expected. The Eco map is economy first: 148bhp and 295Nm. Both still sit above the standard 123bhp and 245Nm.
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 petrol variants
- 1.4 16v Turbo 118bhp 2009-2016
- 1.6 16v VVT 113bhp 2009-2016
- 1.4 16v Turbo 138bhp 2009-2016
- 1.4 16v VVT 99bhp 2009-2016
- 1.4 16v VVT 86bhp 2009-2016
- 1.6 16v Turbo 177bhp 2009-2016
- 1.6 16v Turbo 197bhp 2013>
- 2.0 Turbo VXR 276bhp 2009-2016
All petrol Astra (J) variants · Astra (J) 2009-2016 overview · All Vauxhall figures