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Isuzu Transtron Aurix RZ4F Module – ECU Calibration for TC275T
The Isuzu Transtron Aurix RZ4F module is designed for professional calibration and tuning of ECU firmware for Transtron control units based on Infineon Aurix TC275T microcontrollers. It is compatible with diesel vehicles from Isuzu and Mazda equipped with 2.2 TD RZ4F engines. Supports files up to 4.0 MB in size.
To activate the module you need a USB key BitBix/BitEdit. When ordering, please indicate the Serial Number of the key.
Supported Calibration Maps Isuzu Transtron Aurix RZ4F:
- Boost Pressure:
- Boost limit per atmospheric pressure correction
- Boost limit per intake air temperature
- Boost pressure in additional mode
- Maximum boost limit
- Maximum turbo position limit
- Turbo position in additional mode
- DPF (Diesel Particulate Filter):
- DPF boost pressure in additional mode
- Turbo position DPF in additional mode
- EGR (Exhaust Gas Recirculation):
- EGR position in additional mode
- EGR target position
- Intake throttle position in additional mode
- Maximum EGR position
- Position per injection quantity
- Injection:
- Injector lift time
- Injector lift time conversion
- Limiters:
- Torque limit conversion
- Injection quantity limit by boost
- Injection quantity limit by intake air temperature
- Injection quantity limit per mass air flow
- Injection quantity low limit
- Torque limit per atmospheric pressure correction
- Torque limit per clutch stroke
- Torque limit per coolant temperature
- Maximum torque limit per coolant temperature
- Torque limit per exhaust gas temperature
- Torque limit per fuel temperature
- Torque limit per gear
- Torque limit per intake air temperature
- Torque limit per intercooler temperature in
- Torque limit per intercooler temperature out
- Torque limit per injection quantity
- Torque limit per speed
- Vehicle speed limitation
- Mass Air Flow & Temperature Sensors:
- Coolant temperature sensor voltage
- Fuel temperature sensor voltage
- Intake air temperature sensor voltage
- Mass air flow in additional mode
- Mass air flow sensor voltage
- Rail Pressure:
- Fuel rail pressure
- Maximum rail pressure limit
- Rail pressure start
- Start of Injection:
- Start of injection in additional mode
- Torque Control:
- Accelerator pedal position conversion
- Accelerator torque position
- DTC (Diagnostic Trouble Codes)
Important:
This function is available only on certain BMW engines and is NOT applicable to other vehicle brands.
The information below applies only to stock engines with factory ECU software and a standard exhaust system.
What This Parameter Actually Represents
This is NOT a direct measurement of fuel octane and is NOT a direct octane reading calculated by the ECU.
The value is an adaptation factor ranging from 0 to 1, where:
- 0 = no correction
- 1 = maximum correction
According to BMW’s internal definition:
Faktor adaptierte Kraftstoffqualität (0 = ROZ98 / 1.0 = ROZ91)
- 0 corresponds to 98 ROZ
- 1.0 corresponds to 91 ROZ
ROZ is the German equivalent of RON (Research Octane Number).
The device converts this multiplier into a more intuitive octane value for user convenience.
⚠️ The device does not measure anything itself.
It only displays the data provided by the engine control unit (ECU).
How the ECU Evaluates Fuel Quality
Each ECU has different calibration sensitivity:
- Sensitivity to the adaptation factor
- Sensitivity of the knock control system
Fuel quality is evaluated subjectively by the ECU, primarily based on:
- Knock ignition timing corrections
- Overall engine noise levels
BMW G-Series & LCI F-Series (B-Engines)
B38 / N63 / S63 / N74
These engines are highly sensitive to octane adaptation.
- During warm-up and cruising, the displayed octane may frequently drop to 95 or lower.
- This does NOT automatically indicate poor fuel quality.
- Under load, the value should increase.
⚠️ If the value continues to decrease under load, this may indicate a problem.
B46 / B48 / B58
These engines have low sensitivity.
- During cruising, octane will typically display maximum values even with mediocre fuel.
- Under load, the value will decrease if fuel quality is truly poor.
S58
Octane correction is virtually inactive.
- It will typically always show 98.
- If it drops below 98, fuel quality is genuinely very poor.
BMW F-Series (Pre-LCI) with N/S Engines
Most pre-LCI F-series ECUs do not calculate octane adaptation.
Do not expect this parameter to function.
S55
- Octane parameter not used by the system
- Display not supported
- However, display of the last 5 refueling quality events is supported
S63
- Octane parameter not used
- Display not supported
- Refueling quality display not supported
BMW E-Series
Octane parameter not available. Display not supported.
Important Notes About Tuned Vehicles
With modified hardware or custom tuning, behavior may vary significantly. Always consult your tuner regarding expected operation.
Key principles:
- If octane drops under load, it means fuel quality is worse than expected under those conditions.
- This does NOT automatically mean the fuel itself is bad.
Examples:
- If a tuner increases ignition timing and boost pressure, even good fuel may cause knock corrections, and the ECU may interpret it as poor fuel.
- Thin-walled or poorly mounted exhaust systems may create parasitic noise, which the ECU may interpret as engine knock, causing negative correction.
- Conversely, if knock sensitivity is reduced or octane correction is disabled in tuning, readings may appear ideal while actual engine safety is compromised.