Stage 1
Stage 1 · Diesel · 4.0 TDI 275hp
Audi A8 4.0 V8 TDI Stage 1 file Bosch · 4E0907409B · SW 369539
Audi A8 4.0 V8 TDI Turbo Diesel 202.3 kW (275 HP) Stage 12004, Turbo diesel, 202.3 kW (275 hp)
275 → 330 HP +55 HP +120 Nm 20% more power
Calibrated ECU file for 4E0907409B (SW 369539). Checksum-corrected, ready to flash. Delivered instantly via secure download after payment.
Performance projection
Matched engine: 4.0 TDI 275hp, ASE, 3.9L, Diesel. Engine #522 in our gains database.
- Power
- 330 HP+55 HP from 275
- Torque
- 770 Nm+120 Nm from 650
- 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 4E0907409B and software 369539.
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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 1, Diesel.
Hardware
- No hardware changes required: runs on completely stock hardware
Software / calibration
- Boost pressure optimised within factory turbo limits
- Injection timing & quantity remapped
- Smoke / EGT limiters refined
- DTCs left intact, factory safeties preserved
Stage 1 is a software-only calibration. Compatible with stock turbo, injectors, intercooler, exhaust and clutch.
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 | A8 |
| Model year | 2004 |
| Displacement | 4.0 L |
| Fuel / Induction | Turbo Diesel |
| Factory power | 202.3 kW (275 HP) |
| ECU manufacturer | Bosch |
| ECU ID | 4E0907409B |
| ECU software | 369539 |
| Calibration stage | Stage 1 |
| Cylinder capacity | 3936 CC |
| Compression ratio | 17,5 : 1 |
| Bore × Stroke | 81,0 X 95,5 mm |
| OEM engine code | ASE |
| 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 | 275 HP | 650 Nm | — | — |
| Stage 1 | 330 HP | 770 Nm | +55 (20%) | +120 |
| Stage 2 | 390 HP | 956 Nm | +115 (41.8%) | +306 |
| Stage 3 | 413 HP | 1008 Nm | +138 (50.2%) | +358 |
| Stage 4 | 495 HP | 1203 Nm | +220 (80%) | +553 |
About this calibration file
The Stage 1 calibration for the 2004 Audi A8 4.0L Turbo Diesel is a drop-in remap that works on completely stock hardware — no turbo, injector, intercooler or fuel-system upgrades required. Injection timing, boost targets, rail-pressure limits and torque maps are rebalanced to extract the safe headroom the OEM leaves untouched for fleet-fuel tolerance, altitude margin and warranty buffer.
This file matches a Bosch ECU and software version 369539. 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: 330 HP and 770 Nm at the crank — a gain of +55 HP (20%) and +120 Nm over the factory 275 HP / 650 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
Product details
This product contains a calibrated Stage1 tuning file for Audi A8 4.0 V8 TDI 2004 Turbo-Diesel 202.3KW with Bosch 4E0907409B (Bosch software number 369539 ( 1037369539 )). The base stock vehicle for this calibration has a factory output of around 202.3 kW (~275 HP). This Stage 1 calibration is designed for stock hardware, offering a safe and reliable increase in power and torque for daily use.
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 4E0907409B, 369539 (1037 + SW code). Use this file for diagnostics, cloning, recovery or as a base for custom remapping.
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