Stage 1
Stage 1 · Petrol · 320si 173hp
BMW E30 325IX Stage 1 file Bosch HW 0261200081
BMW E30 325IX Petrol 125.8 kW (171 HP) Stage 12004, Petrol, 125.8 kW (171 hp)
173 → 185 HP +12 HP +20 Nm 7% more power
Calibrated ECU file for 0261200081. Checksum-corrected, ready to flash. Delivered instantly via secure download after payment.
Performance projection
Matched engine: 320si 173hp, N45B20A, Petrol. Engine #9457 in our gains database.
- Power
- 185 HP+12 HP from 173
- Torque
- 220 Nm+20 Nm from 200
- 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
-
Read your ECU
With KESS, KTAG, AutoTuner or Flex. Keep the read: it is your way back.
-
Match the numbers
Your read must show hardware 0261200081.
-
Pay and download
Card, Apple Pay or Google Pay. The file is in your account straight away.
-
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, Petrol.
Hardware
- No hardware changes required: runs on completely stock hardware
Software / calibration
- Boost / load targets optimised within factory hardware limits
- Ignition advance refined for the running fuel grade
- Throttle response and torque request remapped
- Factory safeties (knock, lambda, EGT) 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 | BMW |
|---|---|
| Vehicle model | E30 325ix |
| Model year | 2004 |
| Fuel / Induction | Petrol |
| Factory power | 125.8 kW (171 HP) |
| ECU manufacturer | Bosch |
| ECU hardware | 0261200081 |
| ECU software | 1267358546 |
| Calibration stage | Stage 1 |
| OEM engine code | N45B20A |
| 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 | 173 HP | 200 Nm | — | — |
| Stage 1 | 185 HP | 220 Nm | +12 (6.9%) | +20 |
| Stage 2 | 196 HP | 231 Nm | +23 (13.3%) | +31 |
| Stage 3 | 285 HP | 310 Nm | +112 (64.7%) | +110 |
| Stage 4 | 337 HP | 370 Nm | +164 (94.8%) | +170 |
About this calibration file
The Stage 1 calibration for the 2004 BMW E30 325ix Petrol 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 with hardware number 0261200081 and software version 1267358546. 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: 185 HP and 220 Nm at the crank — a gain of +12 HP (7%) and +20 Nm over the factory 173 HP / 200 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
0261200081 (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 Stage1 tuning file for BMW E30 325IX 2004 Benzin 125.8KW with Bosch 0261200081. The base stock vehicle for this calibration has a factory output of around 125.8 kW (~171 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 0261200081. Use this file for diagnostics, cloning, recovery or as a base for custom remapping.
E210DABF 728B727F 44449144 C89ACA3F 24CBC577 20A9D2FB F660067B 76B70B82