| Guarantee, months12 months |
Measurement device Dragy Performance meter designed for tracking the acceleration dynamics, power, braking distance of a car, as well as measuring lap times and checkpoints. Second-generation device DRG70.
The Dragy device for measuring the acceleration dynamics of your car uses high-speed GPS and GLONASS. A-GPS technology is used to connect to satellites, allowing the device to be operational within 2 seconds after turning it on. The measurement accuracy is up to 0.01 seconds.
All car dynamics measurements are automatically displayed on your smartphone or tablet through the Dragy app, which is available for both Android and iPhone iOS platforms. Through the app, you can easily publish your race results on social media and forums, share results with your friends, and record video of the measurements.
The Dragy device has the ability to record altitude logs at the start and finish lines. If there is a height deviation of more than 1%, the race will be considered invalid.
All race data is saved in metric and SAE formats, allowing you to compare 100-200 km/h and all metric equivalents. For your convenience, you can choose different speed segments and distances for acceleration or elapsed time measurement, braking time measurement (e.g., 100-0), and more.
The system can be launched simultaneously with JB4 Mobile and other Bluetooth applications.
Main Dragy features:
- 0-60 km/h, 0-100 km/h, 100-200 km/h acceleration measurement
- Distance elapsed time measurement
- Braking distance and time measurement, such as 100-0 km/h, 200-0 km/h
- Lap time measurement
- G-force meter (accelerometer)
- Participant rankings by brand and leaderboard
- Ability to share measurement results on social media
- Ability to record video of measurements and overlay graphics with dynamic information
- Personal profile and event feed
- Overlaying performance data on your mobile phone camera (under development)
- Virtual races with friends (under development)
- Internal chat for discussing photos and performance (under development)
- And much more
Package contents:
- Dragy Performance Box
- USB charging cable
- 2 metal plates and double-sided 3M tape for mounting the support plates
- User manual
- Packaging box
How DRAGY DRG70 (second generation) differs from DRG69 (first generation):
- Most importantly: the new GPS module uses Ublox 10th generation instead of Ublox 8th generation
- New Bluetooth module with Bluetooth 5.0 support instead of Bluetooth 4.0
- The new GPS module supports communication with GPS, GLONASS, Galileo, Beidou satellites, while the old one only supported GPS and GLONASS
- The new GPS module supports simultaneous communication with a larger number of satellites
- Battery life on a single charge increased by 40%
| 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.