Original file
Original / Factory · Petrol · 4.2 FSI 420hp
Audi R8 4.2 FSI original file Bosch HW 0261S02234 · 420907560 · SW 504405
Audi R8 4.2 FSI Petrol 308.9 kW (420 HP) Original2008, Petrol, 308.9 kW (420 hp)
420 HP Factory calibration Stock backup file, 430 Nm, Petrol
Calibrated ECU file for 0261S02234 (SW 504405). Checksum-corrected, ready to flash. Delivered instantly via secure download after payment.
Performance projection
Matched engine: 4.2 FSI 420hp, BYH, 4.2L, Petrol. Engine #644 in our gains database.
- Power
- 420 HPfactory calibration
- Torque
- 430 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 0261S02234 and software 504405.
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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 | Audi |
|---|---|
| Vehicle model | R8 |
| Model year | 2008 |
| Displacement | 4.2 L |
| Fuel / Induction | FSI |
| Factory power | 308.9 kW (420 HP) |
| ECU manufacturer | Bosch |
| ECU hardware | 420907560 |
| ECU software | 504405 |
| Calibration stage | Original (Factory) |
| Cylinder capacity | 4163 CC |
| Compression ratio | 12,5 : 1 |
| Bore × Stroke | 84,5 X 92,8 mm |
| OEM engine code | BYH |
| 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 | 420 HP | 430 Nm | — | — |
| Stage 1 | 440 HP | 455 Nm | +20 (4.8%) | +25 |
| Stage 2 | 455 HP | 458 Nm | +35 (8.3%) | +28 |
| Stage 3 | 693 HP | 667 Nm | +273 (65%) | +237 |
| Stage 4 | 819 HP | 796 Nm | +399 (95%) | +366 |
About this calibration file
This is the factory (original) ECU calibration for the 2008 Audi R8 4.2L FSI, 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 420907560 and software version 504405. 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
420907560 (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 Audi R8 4.2 FSI 2008 Benzin 308.9KW with Bosch 0261S02234 (Bosch software number 504405 ( 1037504405 )). This original file corresponds to a factory engine output of approximately 308.9 kW (~420 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 0261S02234, 504405 (1037 + SW code). Use this file for diagnostics, cloning, recovery or as a base for custom remapping.
12A907D1 9E31DE0F D913817C 17393CC7 81F98FA8 9F91D691 84D10F5F 69D56CE5