Stage 4
Stage 4 · Petrol · 4.2 V8 340hp
Audi S6 4.2 V8 Stage 4 file Bosch HW 0261206372 · 4D0907558 · SW 352381
Audi S6 4.2 V8 Petrol 250.1 kW (340 HP) Stage 42002, Petrol, 250.1 kW (340 hp)
340 → 663 HP +323 HP +357 Nm 95% more power
Calibrated ECU file for 0261206372 (SW 352381). Checksum-corrected, ready to flash. Delivered instantly via secure download after payment.
Performance projection
Matched engine: 4.2 V8 340hp, AQJ, 4.2L, Petrol. Engine #692 in our gains database.
- Power
- 663 HP+323 HP from 340
- Torque
- 777 Nm+357 Nm from 420
- 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 0261206372 and software 352381.
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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 | S6 |
| Model year | 2002 |
| Displacement | 4.2 L |
| Fuel / Induction | Petrol |
| Factory power | 250.1 kW (340 HP) |
| ECU manufacturer | Bosch |
| ECU hardware | 0261206372 |
| ECU software | 352381 |
| Calibration stage | Stage 4 |
| Cylinder capacity | 4172 CC |
| Compression ratio | 11,0 : 1 |
| Bore × Stroke | 84,5 X 93,0 mm |
| OEM engine code | AQJ |
| 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 | 340 HP | 420 Nm | — | — |
| Stage 1 | 360 HP | 450 Nm | +20 (5.9%) | +30 |
| Stage 2 | 382 HP | 473 Nm | +42 (12.4%) | +53 |
| Stage 3 | 561 HP | 651 Nm | +221 (65%) | +231 |
| Stage 4 | 663 HP | 777 Nm | +323 (95%) | +357 |
About this calibration file
The Stage 4 calibration for the 2002 Audi S6 4.2L 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 0261206372 and software version 352381. 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: 663 HP and 777 Nm at the crank — a gain of +323 HP (95%) and +357 Nm over the factory 340 HP / 420 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
0261206372 (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 S6 4.2 V8 2002 Benzin 250.1KW with Bosch 0261206372 and software ID 4D0907558 (Bosch software number 352381 ( 1037352381 )). The base stock vehicle for this calibration has a factory output of around 250.1 kW (~340 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 0261206372, 4D0907558, 352381 (1037 + SW code). Use this file for diagnostics, cloning, recovery or as a base for custom remapping.
76E7FE46 C67712DB D15F6B9A 4FB619AA C4F60129 504EF6A2 3FB5F314 FE5E2B8D