BHP+17 hp (10%)
Standard
170 hp
Tuned
187 hp
Torque+27 Nm (11%)
Standard
245 Nm
Tuned
272 Nm
Suitability
Moderate (4.5/10)Gains Profile
BalancedHeadroom
MediumBMW 5 Series 523i 170hp ECU Remapping
Considering an ECU remap for your BMW 5 Series 523i 170hp? A Stage 1 remap can take this E39 - 1995 - 2003 petrol engine from 170 BHP to 187 BHP and from 245 Nm to 272 Nm of torque (naturally aspirated). This engine scores 4.5/10 for remap suitability. Get a free personalised quote from a trusted remap professional and find out exactly what your BMW 5 Series can achieve.
How this engine compares
- 89thof 100 BMW 5 Series engines by power gain
- 12%of the 9,842 engines we hold gain data for see a smaller power increase
- 16%of engines with torque data see a smaller torque increase
Comparisons are calculated from our own recorded Stage 1 figures.
Assessment
The BMW 5 serie 523i 170hp is a 2.5L naturally aspirated petrol engine producing 170 BHP and 245 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 187 BHP and 272 Nm — a gain of around 17 BHP (10%) and 27 Nm (11%).
This engine has limited remap suitability, with a balanced spread of gains across both power and torque — providing a noticeable improvement across the rev range. The tuning headroom is classified as moderate, based on the percentage gain available from the factory output.
Considerations: Naturally aspirated engine: gains are usually limited; results vary widely.
All figures shown are typical estimates based on aggregated Stage 1 data for this engine variant. Actual results depend on vehicle condition, mileage, and the chosen tuning method. We recommend discussing your specific vehicle with a qualified remap professional.
Considerations
!Naturally aspirated engine: gains are usually limited; results vary widely.
Other 5 Series E39 - 1995 - 2003 Engines
| Engine | BHP | Gain | Torque | Gain |
|---|