Original file
Original / Factory · Petrol · 523i 170hp
BMW E39 520i original file Bosch · SW 430037
BMW E39 520i Petrol 125 kW (170 HP) Original2001, Petrol, 125 kW (170 hp)
170 HP Factory calibration Stock backup file, 245 Nm, Petrol
Calibrated ECU file for (SW 7511570). Checksum-corrected, ready to flash. Delivered instantly via secure download after payment.
Performance projection
Matched engine: 523i 170hp, 256S3, 2.5L, Petrol. Engine #958 in our gains database.
- Power
- 170 HPfactory calibration
- Torque
- 245 Nmfactory calibration
Real data from Gains API. Dyno curve = typical ECU-family projection. Final gains depend on fuel, altitude, wear.
How it works
-
Read your ECU
With KESS, KTAG, AutoTuner or Flex. Keep the read: it is your way back.
-
Match the numbers
Your read must show hardware 5303 and software 430037.
-
Pay and download
Card, Apple Pay or Google Pay. The file is in your account straight away.
-
Write it and drive
Write it back the way you read it. Not right for your car? We correct it free.
What the car needs
Required modifications: Factory, Petrol.
Hardware
- Factory hardware: no modifications required
Software / calibration
- OEM calibration restored (recovery / immobiliser / coding work)
Original files are used to revert to factory state, repair after a faulty tune, or recover an ECU before service work.
Vehicle & ECU specifications
Exact vehicle, engine and ECU identifiers this calibration file is written for. Cross-check against your ECU before flashing.
| Vehicle make | BMW |
|---|---|
| Vehicle model | E39 520i |
| Model year | 2001 |
| Fuel / Induction | Petrol |
| Factory power | 125 kW (170 HP) |
| ECU manufacturer | Bosch |
| ECU software | 7511570 |
| Calibration stage | Original (Factory) |
| Cylinder capacity | 2495 CC |
| Compression ratio | 10,5 : 1 |
| Bore × Stroke | 84,0 X 75,0 mm |
| OEM engine code | 256S3 |
| File format | BIN / ORI |
| Checksum | Pre-corrected (ready to flash) |
| Delivery | Instant download after payment |
Engine performance matrix
Power, torque and fuel-economy figures for every tuning stage on this engine, sourced from the tuning-database Gains API. Values are healthy-engine crank numbers; real on-road gains vary with fuel, altitude and mechanical condition.
| Stage | Power | Torque | Δ HP | Δ Nm |
|---|---|---|---|---|
| Original / Factory | 170 HP | 245 Nm | — | — |
| Stage 1 | 187 HP | 272 Nm | +17 (10%) | +27 |
| Stage 2 | 198 HP | 286 Nm | +28 (16.5%) | +41 |
| Stage 3 | 281 HP | 380 Nm | +111 (65.3%) | +135 |
| Stage 4 | 332 HP | 453 Nm | +162 (95.3%) | +208 |
About this calibration file
This is the factory (original) ECU calibration for the 2001 BMW E39 520i Petrol, extracted from a genuine stock control unit. Use it as a verified backup before flashing any performance tune, or as a reference when recovering an ECU from a failed write.
This file matches a Bosch ECU and software version 7511570. Verify both identifiers in your flashing tool before writing — an ID mismatch is the most common cause of a bricked ECU. If you are unsure, upload a read of your original file via the file-request wizard and our engineers will confirm compatibility before you flash.
The file is delivered as a ready-to-flash BIN (and ORI backup where applicable) compatible with all major tools — KESS V2/V3, KTAG, AutoTuner, CMDFlash, Dimsport New Genius, MPPS, Flex, BFlash, PCMFlash, MMFlash — via OBD, bench or boot-mode as supported by your ECU family. Checksums are pre-computed and verified; no additional checksum tool is required. All files include a free revision if post-flash logs reveal a fuelling, boost or EGT issue.
Frequently asked questions
Product details
This product contains a complete original ECU backup (stock file) for BMW E39 520i 2001 Benzin 125KW with Bosch 5303 (Bosch software number 430037 ( 1037430037 )). This original file corresponds to a factory engine output of approximately 125 kW (~170 HP). This file is ideal for ECU cloning, restoring the car back to stock and using it as a safe base for future remaps.
All ECU tuning files from TUNING-DATABASE are prepared for professional use. They are useful whenever you search by ECU ID, hardware or software number such as 5303, 430037 (1037 + SW code). Use this file for diagnostics, cloning, recovery or as a base for custom remapping.
738A7E84 7E5227DC 5D71478F D13EFACB E1BF4EC5 A55C3E81 70A1A9A2 63DD07F7