STAGE 2 Diesel 4.2 TDI 326hp

Audi A8 4.2 TDI CR Turbo Diesel 239.8 kW (326 HP) Stage 2

0100200300400 10002000300040005000 399 HP +73 915 Nm +265 HP Nm RPM 0220440660880
Stock Stage 2 HP / Nm projection
326 399 HP
+73 HP +265 Nm 22% more power

Calibrated ECU file for . Checksum-corrected, ready to flash. Delivered instantly via secure download after payment.

16,293 calibration files in catalog · 9,693 engines · 400+ ECU platforms · Engineering since 2012 · WhatsApp support · < 30 min first response
Performance Projection Engine #551 · Gains DB TYPICAL PROJECTION
MATCHED ENGINE 4.2 TDI 326hp BMC 4.1L Diesel Stage 2
0100200300400 10002000300040005000 399 HP +73 915 Nm +265 HP Nm RPM 0220440660880
Stock Stage 2 HP (left) · Nm (right) · Curve shape typical for this ECU family
Real data from Gains API Dyno curve = typical ECU-family projection Final gains depend on fuel, altitude, wear
Required Modifications Stage 2 · Diesel
Hardware
  • Sport / decat downpipe (or DPF removal where legally permitted off-road)
  • High-flow air intake (recommended)
  • Optional: catback exhaust for lower backpressure
Software / Calibration
  • DPF / EGR / AdBlue switched off in software (where lawful)
  • Boost & rail pressure raised to match new airflow
  • Smoke limiter relaxed in line with hardware
  • Lambda + EGT safeties retuned

Stage 2 keeps the factory turbo and internals. Final figures vary slightly with the exact hardware fitted.

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 2006
Displacement 4.2 L
Fuel / Induction Turbo Diesel
Factory power 239.8 kW (326 HP)
ECU manufacturer Bosch
ECU hardware 4E1907409
Calibration stage Stage 2
Cylinder capacity 4134 CC
Compression ratio 16,5 : 1
Bore × Stroke 83,0 X 95,5 mm
OEM engine code BMC
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.

Engine4.2 TDI 326hp CodeBMC Displacement4.1L Capacity4134 CC Compression16,5 : 1 Bore × Stroke83,0 X 95,5 mm FuelDiesel Engine ID#551
Stage Power Torque Δ HP Δ Nm
Original / Factory 326 HP 650 Nm — —
Stage 1 380 HP 880 Nm +54 (16.6%) +230
Stage 2 399 HP 915 Nm +73 (22.4%) +265
Stage 3 489 HP 1008 Nm +163 (50%) +358
Stage 4 587 HP 1203 Nm +261 (80.1%) +553
Fuel economy gain (vs. factory map, same driving profile): combined cycle −8% , full-load cruise −12%. Diesel calibrations typically net bigger combined-cycle savings thanks to shorter duty-cycle on low-load driving.

About this calibration file

The Stage 2 calibration for the 2006 Audi A8 4.2L Turbo Diesel is written for vehicles with supporting bolt-ons: a higher-flow downpipe or sports catalyst, upgraded intercooler and upgraded intake are recommended. Boost targets, fuel-rail pressure, injector duration and VGT positioning are pushed further than a Stage 1 map while keeping exhaust-gas temperatures inside safe bands.

This file matches a Bosch ECU with hardware number 4E1907409. 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: 399 HP and 915 Nm at the crank — a gain of +73 HP (22%) and +265 Nm over the factory 326 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

The file is written for the exact ECU hardware 4E1907409 (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.

Stage 2 benefits from a higher-flow downpipe or sports catalyst, an upgraded intercooler on forced-induction engines, and in some cases a cooler intake. The map will run on stock hardware but will not reach the quoted figures without the supporting bolt-ons.

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 2006 Audi A8 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. Immediately after payment clears (typically < 30 seconds on Stripe / PayPal), the download link appears in your account dashboard and is also emailed to you. The link is a signed, expiring URL — download it within 24 hours; if it expires, just re-generate from the dashboard at any time.

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.

This product contains a calibrated Stage2 tuning file for Audi A8 4.2 TDI CR 2006 Turbodiesel 239.8KW with Bosch 4E1907409 (Bosch software number 383056 ( 1037383056 )). The base stock vehicle for this calibration has a factory output of around 239.8 kW (~326 HP). Stage 2 is intended for cars with supporting modifications (exhaust, intake, intercooler) and delivers a stronger performance gain.

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 4E1907409, 383056 (1037 + SW code). Use this file for diagnostics, cloning, recovery or as a base for custom remapping.

SHA-256 fingerprint55D84728 56AD7406 C5CA1EEB 815DBDDB 5C4BD535 C509ECFB 1192C606 1F6F7A2B

Same engine — other calibrations

Alternative stages for the same ECU: Audi family