Vauxhall Astra (H) 2004-2010 1.6 104bhp remap figures
Stock, this 2004-2010 Vauxhall Astra petrol (1.6L) produces 104bhp and 149Nm. Our expected figures for a Stage 1 remap are 116bhp and 164Nm, an expected gain of up to 12bhp and 15Nm.
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 | 104 bhp | 116 bhp | +12 bhp |
| Torque | 149 Nm | 164 Nm | +15 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 104 bhp | 149 Nm | |
| Stage 1Maximum software-only performance | 116 bhp | 164 Nm | +12 bhp +15 Nm |
| Stage 1 EcoPerformance with economy in mind | 113 bhp | 163 Nm | +9 bhp +14 Nm |
| Eco mapEconomy first | 112 bhp | 162 Nm | +8 bhp +13 Nm |
Who is the Stage 1 map for?
- Drivers who want a sharper throttle and a small, honest gain from software alone.
- Owners who would rather keep the car standard in every other way.
- Anyone who wants the fullest software-only map for this engine, accepting that the gain is modest without a turbocharger.
What this means for your Astra
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 Siemens Simtec 75 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 1.6 104bhp?
We expect 116bhp and 164Nm against 104bhp and 149Nm as standard: up to +12bhp and +15Nm. 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 1.6 104bhp?
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: 113bhp and 163Nm expected. The Eco map is economy first: 112bhp and 162Nm. Both still sit above the standard 104bhp and 149Nm.
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 88bhp 2004-2010
- 1.8 VVT 138bhp 2004-2010
- 2.0T 168bhp 2004-2010
- 1.6 16v Turbo 177bhp 2004-2010
- 2.0T 197bhp 2004-2010
- 2.0T VXR 236bhp 2004-2010
All petrol Astra (H) variants · Astra (H) 2004-2010 overview · All Vauxhall figures