ORIGINAL / FACTORY Petrol M3 321hp

BMW E36 M3 Petrol 236 kW (321 HP) Original

080160240320 1000200030004000500060007000 321 HP +0 350 Nm +0 HP Nm RPM 0100200300400
Stock Original / Factory HP / Nm projection
321 HP Factory calibration
Stock backup file — 350 Nm · Petrol

Calibrated ECU file for . Checksum-corrected, ready to flash. Delivered instantly via secure download after payment.

16,293 calibration files in catalog · 9,693 engines · 400+ ECU platforms · Engineering since 2012 · WhatsApp support · < 30 min first response
Performance Projection Engine #1270 · Gains DB
MATCHED ENGINE M3 321hp 326S1 3.2L Petrol Factory
080160240320 1000200030004000500060007000 321 HP +0 350 Nm +0 HP Nm RPM 0100200300400
Stock Factory HP (left) · Nm (right) · Curve shape typical for this ECU family
Real data from Gains API Dyno curve = typical ECU-family projection Final gains depend on fuel, altitude, wear

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 E36 M3
Model year 1997
Fuel / Induction Petrol
Factory power 236 kW (321 HP)
ECU manufacturer Siemens
Calibration stage Original (Factory)
Cylinder capacity 3201 CC
Compression ratio 11,3 : 1
Bore × Stroke 86,4 X 91,0 mm
OEM engine code 326S1
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.

EngineM3 321hp Code326S1 Displacement3.2L Capacity3201 CC Compression11,3 : 1 Bore × Stroke86,4 X 91,0 mm FuelPetrol Engine ID#1270
Stage Power Torque Δ HP Δ Nm
Original / Factory 321 HP 350 Nm — —
Stage 1 350 HP 380 Nm +29 (9%) +30
Fuel economy gain (vs. factory map, same driving profile): combined cycle −8% , full-load cruise −12%. Diesel calibrations typically net bigger combined-cycle savings thanks to shorter duty-cycle on low-load driving.

About this calibration file

This is the factory (original) ECU calibration for the 1997 BMW E36 M3 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 Siemens ECU. 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

The file is written for the exact ECU hardware (Siemens) 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.

Two reasons. First, if your ECU write failed mid-flash and you need a verified stock image to recover from — this file restores the unit to the exact calibration it left the factory with. Second, if you plan to experiment with a tune and want a known-good rollback point that is guaranteed identical to a BMW dealer programming.

Instant. Immediately after payment clears (typically < 30 seconds on Stripe / PayPal), the download link appears in your account dashboard and is also emailed to you. The link is a signed, expiring URL — download it within 24 hours; if it expires, just re-generate from the dashboard at any time.

Pre-corrected. Every tuning file we sell is processed through CHKSuite (our in-house checksum engine) before it reaches your download link. You can flash it directly with KESS, KTAG, AutoTuner, CMD, Dimsport or any other supported tool — no extra checksum step required. A zero-CRC write to a modern Bosch/Siemens/Delphi ECU bricks the unit, so this is non-negotiable.

Contact us on WhatsApp or through the dashboard support thread. Free revisions are included for the same stage on the same ECU — send us a live log (via VCDS, INPA, EcuConnect, OBDeleven or similar) and we'll adjust timing, boost, rail pressure or smoke limits and re-issue the file. A failed flash itself (write aborted, bricked ECU) is recoverable with our Original file and a bench tool.

This product contains a complete original ECU backup (stock file) for BMW E36 M3 1997 Benzin 236KW with Siemens 5WK9026 (Bosch software number 1406611). This original file corresponds to a factory engine output of approximately 236 kW (~321 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 5WK9026, 1406611. Use this file for diagnostics, cloning, recovery or as a base for custom remapping.

SHA-256 fingerprint0AED6A22 36C0F8FA 38A07571 E6D38720 8389EDCB 375AE048 064DDCDA 47708B88

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