Original file
Original / Factory · Petrol · 320si 173hp
BMW E30 325i original file Bosch HW 0261200173 · SW 355288
BMW E30 325i Petrol 125.8 kW (171 HP) OriginalPetrol, 125.8 kW (171 hp)
173 HP Factory calibration Stock backup file, 200 Nm, Petrol
Calibrated ECU file for 0261200173 (SW 355288). Checksum-corrected, ready to flash. Delivered instantly via secure download after payment.
Performance projection
Matched engine: 320si 173hp, N45B20A, 2L, Petrol. Engine #852 in our gains database.
- Power
- 173 HPfactory calibration
- Torque
- 200 Nmfactory calibration
Real data from Gains API. Dyno curve = typical ECU-family projection. Final gains depend on fuel, altitude, wear.
How it works
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Read your ECU
With KESS, KTAG, AutoTuner or Flex. Keep the read: it is your way back.
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Match the numbers
Your read must show hardware 0261200173 and software 355288.
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Pay and download
Card, Apple Pay or Google Pay. The file is in your account straight away.
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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 | E30 325i |
| Fuel / Induction | Petrol |
| Factory power | 125.8 kW (171 HP) |
| ECU manufacturer | Bosch |
| ECU hardware | 0261200173 |
| ECU software | 355288 |
| Calibration stage | Original (Factory) |
| Cylinder capacity | 1995 CC |
| Compression ratio | 12,0 : 1 |
| Bore × Stroke | 84,0 X 90,0 mm |
| OEM engine code | N45B20A |
| 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 | 173 HP | 200 Nm | — | — |
| Stage 1 | 185 HP | 220 Nm | +12 (6.9%) | +20 |
| Stage 2 | 196 HP | 231 Nm | +23 (13.3%) | +31 |
| Stage 3 | 285 HP | 310 Nm | +112 (64.7%) | +110 |
| Stage 4 | 337 HP | 370 Nm | +164 (94.8%) | +170 |
About this calibration file
This is the factory (original) ECU calibration for the BMW E30 325i 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 with hardware number 0261200173 and software version 355288. 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
0261200173 (Bosch) listed in the specifications. Read your ECU with any supported tool (KESS, KTAG, AutoTuner, CMD, etc.) and compare the hardware + software numbers against the ones on this page. If they match exactly, the file is a direct fit. If you're not 100% sure, upload your original read via the file-request wizard and our engineers will confirm within minutes — no cost, no obligation.Product details
This product contains a complete original ECU backup (stock file) for BMW E30 325i Benzin 125.8KW with Bosch 0261200173 (Bosch software number 355288 ( 1037355288 )). This original file corresponds to a factory engine output of approximately 125.8 kW (~171 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 0261200173, 355288 (1037 + SW code). Use this file for diagnostics, cloning, recovery or as a base for custom remapping.
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