Stage 2
Audi S4 2.2 20V Turbo Stage 2 file Bosch · SW 356702
Audi S4 2.2 20V Turbo Turbo Petrol 169.2 kW (230 HP) Stage 21991, Turbo petrol, 169.2 kW (230 hp)
Calibrated ECU file for (SW 356702). Checksum-corrected, ready to flash. Delivered instantly via secure download after payment.
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 551A and software 356702.
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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 2.
Hardware
- Sport / decat downpipe (or sports-cat)
- High-flow air intake
- Optional: front-mount intercooler upgrade for sustained boost
Software / calibration
- Cat-warm-up & secondary lambda re-mapped for decat hardware
- Boost target raised in line with cooling capacity
- Knock / ignition advance re-trimmed
- Idle and load-transition tables refined
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 | S4 |
| Model year | 1991 |
| Displacement | 2.2 L |
| Fuel / Induction | Petrol |
| Factory power | 169.2 kW (230 HP) |
| ECU manufacturer | Bosch |
| ECU hardware | 551A |
| ECU software | 356702 |
| Calibration stage | Stage 2 |
| File format | BIN / ORI |
| Checksum | Pre-corrected (ready to flash) |
| Delivery | Instant download after payment |
About this calibration file
The Stage 2 calibration for the 1991 Audi S4 2.2L Petrol 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 551A and software version 356702. 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
551A (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 Stage2 tuning file for Audi S4 2.2 20V Turbo 1991 Turbo-Benzin 169.2KW with Bosch 551A (Bosch software number 356702 ( 1037356702 )). The base stock vehicle for this calibration has a factory output of around 169.2 kW (~230 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 551A, 356702 (1037 + SW code). Use this file for diagnostics, cloning, recovery or as a base for custom remapping.
8B9219B8 2B554909 64393878 264991A7 7B1B4DBE 4ED2BF74 3D43760A 0F8CE313