| Guarantee, months12 months |
A multifunctional device for measuring car dynamics, Racebox PRO allows you to measure acceleration time, power, braking distance, lap time, and split times.
The Racebox Pro device is available in two versions: without a battery and with a built-in rechargeable battery.
The Racebox PRO version supports MicroSD memory cards and can connect to mobile devices using BLE standards (Bluetooth 4.0 Low Energy), allowing measurements on both Android and iOS platforms.
The device measures acceleration time, braking distance, power, lap time, and split times. All readings are displayed on a bright LED display with 3 levels of brightness and protected by a red filter. The screen prominently displays speed, acceleration, altitude, slope, and other GPS data in large characters (readable in any conditions). The GNSS data refresh and logging rate is 16 Hz, ensuring high measurement accuracy comparable to more expensive and popular devices like Racelogic.
The device allows you to save all logs and measurement results to an SD card, enabling a comprehensive analysis of your measurements. Additionally, with the help of mobile devices and compatible mobile applications, you can record and analyze all the data.
Compatible applications for Racebox:
- Harry's Laptimer (and other Harry's apps)
- RaceChrono
- Track Addict
- RaceBuddy (iOS only)
- Speed Logic (Android only)
Measurement types and device functions:
The Pro version also allows connecting BLE-compatible OBD2 adapters to the device. When an external OBD adapter is connected, the Racebox device can record not only GNSS parameters but also data from the vehicle (engine RPM, throttle opening, temperature, etc.) in the log file. It also enables the function of measuring gear shift time during acceleration.
Package Contents:
- Racebox PRO device
- Suction cup mount for attaching to the windshield
- USB Type-C cable
- Instruction manual
| Guarantee, months | 12 months |
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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.