Stage 4
Stage 4 · Petrol · 2.7 V6 Biturbo 380hp
Audi RS4 2.7 V6 BiTurbo Stage 4 file Bosch HW 0261206635 · 8D0907551F · SW 354531
Audi RS4 2.7 V6 BiTurbo Turbo Petrol 279.5 kW (380 HP) Stage 42003, Turbo petrol, 279.5 kW (380 hp)
380 → 741 HP +361 HP +374 Nm 95% more power
Calibrated ECU file for 0261206635 (SW 354531). Checksum-corrected, ready to flash. Delivered instantly via secure download after payment.
Performance projection
Matched engine: 2.7 V6 Biturbo 380hp, ASJ / AZR, 2.7L, Petrol. Engine #654 in our gains database.
- Power
- 741 HP+361 HP from 380
- Torque
- 814 Nm+374 Nm from 440
- Fuel economy
- −8 %−12% full load
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 0261206635 and software 354531.
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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: Stage 4, Petrol.
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 | Rs4 |
| Model year | 2003 |
| Displacement | 2.7 L |
| Fuel / Induction | Petrol |
| Factory power | 279.5 kW (380 HP) |
| ECU manufacturer | Bosch |
| ECU ID | 8D0907551F |
| ECU hardware | 0261206635 |
| ECU software | 354531 |
| Calibration stage | Stage 4 |
| Cylinder capacity | 2671 CC |
| Compression ratio | 9,0 : 1 |
| Bore × Stroke | 81,0 X 86,4 mm |
| OEM engine code | ASJ / AZR |
| 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 | 380 HP | 440 Nm | — | — |
| Stage 1 | 430 HP | 570 Nm | +50 (13.2%) | +130 |
| Stage 2 | 456 HP | 599 Nm | +76 (20%) | +159 |
| Stage 3 | 627 HP | 682 Nm | +247 (65%) | +242 |
| Stage 4 | 741 HP | 814 Nm | +361 (95%) | +374 |
About this calibration file
The Stage 4 calibration for the 2003 Audi Rs4 2.7L 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 0261206635 and software version 354531. 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.
Projected output on a healthy, stock-hardware example of this engine: 741 HP and 814 Nm at the crank — a gain of +361 HP (95%) and +374 Nm over the factory 380 HP / 440 Nm baseline. These numbers are sourced from our Vehicle Performance Database, which aggregates dyno results across this engine family. Real-world gains depend on fuel grade, ambient temperature, mechanical condition and intake/exhaust state.
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
0261206635 (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 calibrated Stage4 tuning file for Audi RS4 2.7 V6 BiTurbo 2003 Turbo-Benzin 279.5KW with Bosch 0261206635 and software ID 8D0907551F (Bosch software number 354531 ( 1037354531 )). The base stock vehicle for this calibration has a factory output of around 279.5 kW (~380 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 0261206635, 8D0907551F, 354531 (1037 + SW code). Use this file for diagnostics, cloning, recovery or as a base for custom remapping.
F0A176D2 B6F2C872 067466FA 04B5D0B4 8374144E 6F461DBA BC161A5F 0D5AAD00