BMW 5 Series (G30) 2017> 520i (B48B20A) 163bhp remap figures
Stock, this 2017> BMW 5 Series petrol (2.0L) produces 163bhp and 290Nm. Our expected figures for a Stage 1 remap are 255bhp and 412Nm, an expected gain of up to 92bhp and 122Nm.
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 | 163 bhp | 255 bhp | +92 bhp |
| Torque | 290 Nm | 412 Nm | +122 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 163 bhp | 290 Nm | |
| Stage 1Maximum software-only performance | 255 bhp | 412 Nm | +92 bhp +122 Nm |
| Stage 1 EcoPerformance with economy in mind | 232 bhp | 402 Nm | +69 bhp +112 Nm |
| Eco mapEconomy first | 225 bhp | 396 Nm | +62 bhp +106 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 5 Series
Without a turbocharger the improvement comes from ignition, fuelling and throttle mapping rather than boost, so expect a smaller but still noticeable change in response.
Engine management is by a Bosch MG1CS201 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 BMW 5 Series 520i (B48B20A) 163bhp?
We expect 255bhp and 412Nm against 163bhp and 290Nm as standard: up to +92bhp and +122Nm. 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 BMW 5 Series 520i (B48B20A) 163bhp?
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: 232bhp and 402Nm expected. The Eco map is economy first: 225bhp and 396Nm. Both still sit above the standard 163bhp and 290Nm.
Do I need to tell my insurer about a remap?
Yes. A remap is a modification, so you should declare it to your insurer.