Vauxhall Astra (G) 1998-2004 1.7 DTi 73bhp remap figures
Stock, this 1998-2004 Vauxhall Astra diesel (1.7L) produces 73bhp and 164Nm. Our expected figures for a Stage 1 remap are 110bhp and 222Nm, an expected gain of 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 | 73 bhp | 110 bhp | +37 bhp |
| Torque | 164 Nm | 222 Nm | +58 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 73 bhp | 164 Nm | |
| Stage 1Maximum software-only performance | 110 bhp | 222 Nm | +37 bhp +58 Nm |
| Stage 1 EcoPerformance with economy in mind | 101 bhp | 217 Nm | +28 bhp +53 Nm |
| Eco mapEconomy first | 98 bhp | 214 Nm | +25 bhp +50 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 Delphi DTI17 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 DTi 73bhp?
We expect 110bhp and 222Nm against 73bhp and 164Nm 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 1.7 DTi 73bhp?
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: 101bhp and 217Nm expected. The Eco map is economy first: 98bhp and 214Nm. Both still sit above the standard 73bhp and 164Nm.
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
All diesel Astra (G) variants · Astra (G) 1998-2004 overview · All Vauxhall figures