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Stage 4

Audi RS2 2.2 Stage 4 file Bosch HW 0261203478 · 8A0907551B · SW 358289

Audi RS2 2.2 Turbo Petrol 231.7 kW (315 HP) Stage 4

1996, Turbo petrol, 231.7 kW (315 hp)

Calibrated ECU file for 0261203478 (SW 358289). Checksum-corrected, ready to flash. Delivered instantly via secure download after payment.

How it works

  1. Read your ECU

    With KESS, KTAG, AutoTuner or Flex. Keep the read: it is your way back.

  2. Match the numbers

    Your read must show hardware 0261203478 and software 358289.

  3. Pay and download

    Card, Apple Pay or Google Pay. The file is in your account straight away.

  4. 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: Stage 4.

Hardware

  • Built / forged engine internals
  • Large performance turbocharger
  • Uprated HPFP + race-spec injectors (often dual-pump)
  • Race intercooler + chargecooler upgrade
  • Full performance exhaust
  • Reinforced clutch / uprated gearbox
  • Optional: E85 / methanol fuel system

Software / calibration

  • Fully bespoke calibration: typically dyno-tuned on installed hardware
  • Fuelling rebuilt around race injectors / HPFP / E85 blend
  • Boost, ignition / injection timing and lambda targeted to the build
  • Closed-loop safeties retuned around the actual hardware envelope

Stage 4 is a fully built setup: figures shown are a typical envelope. The file is dyno-tuned to your specific hardware spec.

Vehicle & ECU specifications

Exact vehicle, engine and ECU identifiers this calibration file is written for. Cross-check against your ECU before flashing.

Vehicle make Audi
Vehicle model Rs2
Model year 1996
Displacement 2.2 L
Fuel / Induction Petrol
Factory power 231.7 kW (315 HP)
ECU manufacturer Bosch
ECU ID 8A0907551B
ECU hardware 0261203478
ECU software 358289
Calibration stage Stage 4
File format BIN / ORI
Checksum Pre-corrected (ready to flash)
Delivery Instant download after payment

About this calibration file

The Stage 4 calibration for the 1996 Audi Rs2 2.2L Petrol is a built-engine tune. It assumes forged internals, large-frame turbo, upgraded transmission or clutch, and a standalone pre-tune dyno pass. The file is meant as a safe starting map for a professional tuner's in-car refinement.

This file matches a Bosch ECU with hardware number 0261203478 and software version 358289. 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 0261203478 (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.

This stage targets a built setup — hybrid/larger turbo, upgraded injectors, high-flow fuelling, and in some cases upgraded transmission/clutch. Running the file on stock hardware is not supported and can cause detonation, EGT spikes or overboost fuel cuts.

Re-flashing the ECU leaves a flag that a franchised Audi dealer can detect with their diagnostic tool. Most markets treat this as a basis to deny powertrain warranty claims that the modification could have caused. Emissions-sensitive components (DPF, EGR, SCR) remain fully functional with this calibration — we do not remove, disable or alter any emissions hardware.

The power and torque numbers on this page are healthy-engine crank figures. On a well-maintained 1996 Audi Rs2 running a known-good fuel brand, you should see a clearly perceptible increase in mid-range pull — typically from 1,800 to 4,000 rpm on diesel, 2,500 to 6,000 rpm on petrol — along with a shorter 80-to-120 km/h in-gear time. Thermal performance and fuel consumption depend on how you drive post-tune.

Instant. As soon as the payment clears, the file appears under Downloads in your account and the link is emailed to you. It does not expire: sign in and download it again whenever you need it.

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.

Product details

This product contains a calibrated Stage4 tuning file for Audi RS2 2.2 1996 Turbo-Benzin 231.7KW with Bosch 0261203478 and software ID 8A0907551B (Bosch software number 358289 ( 1037358289 )). The base stock vehicle for this calibration has a factory output of around 231.7 kW (~315 HP). This high-stage file targets heavily modified setups (bigger turbo, injectors etc.) and should be used by experienced tuners only.

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 0261203478, 8A0907551B, 358289 (1037 + SW code). Use this file for diagnostics, cloning, recovery or as a base for custom remapping.

SHA-256 fingerprint780D98FA D6C56CEF 9D3F1AEC 7A56A2AF 8B45BF77 847D7F2E 581CA9CA FD56A389

Other files for this ECU

FileECUPrice
Audi RS2 2.2 315 hp Original Bosch 0261203478 358289 £6.99
Audi RS2 2.2 315 hp Stage 1 Bosch 0261203478 358289 £21.99
Audi RS2 2.2 315 hp Stage 2 Bosch 0261203478 358289 £24.99
Audi RS2 2.2 315 hp Stage 3 Bosch 0261203478 358289 £29.99

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