The Helius Odometer is a precision odometer specifically designed for time-speed-distance (TSD) and performance rally sport.
The Helius Odometer emphasizes
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Large, bright displays for clear viewing under all conditions
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Simple one-button operation for quick, error-free action
- Robust construction
Specifically, the odometer features
- A precision of 1 m and a range of 1000 km
- Typical calibration accuracy of 2.5 m per 100 km
- On-the-fly 1m and 10m odometer nudge adjustments
- Reset, count down, hold, and freeze options
- Operates in either kilometers or miles
- Compatible with Terratrip, Brantz, & Alfa probes
- Numeric velocity based on the calibration
- A large, bright 5 digit odometer display
- A large, bright 3 digit velocity display
The Helius Odometer is permitted in most rally classes, including Calculator, Novice, and Historic classes.
2007 Enhancements
- Improved ease of calibration factor input
- Improved buttons with metal shank
- Added reset pedal capability
Odometer Details
The Helius Odometer is very user friendly. The following details illustrate the odometer operation.
Modes
The Helius Odometer has four modes:
- odometer
- pulse count
- calibration
- silent mode
The pulse count and calibration modes allow you to compensate for current tire size and pressure prior to each event.
Calibration
Calibration of the odometer is performed as follows:
- Press RESET in odometer mode
- Precisely drive a known length of road
- Note the number of pulses received in pulse mode
- Divide the distance traveled by the number of pulses received
- Enter the distance traveled per pulse, in hundredths of a millimeter, in calibration mode
Calibration Example:
We recommend driving no less than 1 km, but longer lengths, such as 20 km, make for a more accurate calibration. Suppose we know a length of road that is 7.5 km in length. We drive to the start of the road, and then press RESET in pulse mode, which zeros the odometer and pulse count. After driving the marked section of road as accurately as possible, and stopping precisely at the end, we see in pulse mode that 19108 pulses were received. Our calibration factor is the distance traveled per pulse, or
7.5 km / 19108 pulses = 0.39251 m per pulse = 392.51 mm per pulse
which we enter in the calibration mode. In odometer mode, we press RESET again and are now set to go!
Example in Miles:
10 miles / 20380 pulses = 490.68 * 10-6 miles per pulse
Mounting
The Helius Odometer is only 17cm x 9cm x 4cm in size and approximately 300g in weight, and is therefore easily mounted. You can mount the odometer using a variety of techniques, from employing strips of industrial strength VelcroTM to fashioning a custom bracket mount.
Installation
Installation instructions are included with your Helius Odometer. You may perform the installation yourself, or have any automotive shop help.
Three connections are required (shown below):
- Power (+12V, the positive side of your battery)
- Ground (0V, the negative side of your battery)
- Odometer signal input
Power and ground are easily accessed from many places within your vehicle. The odometer signal may be accessed in many different ways. Popular approaches include
- tapping directly in to your vehicle's electrical system by following schematic diagrams, and connecting the signals directly to the odometer (this approach works for many, though not all, vehicles).
- connecting a sensor to your mechanical speedometer line, if you have one (Terratrip, Brantz).
- installing a hall-effect or switch style wheel-driven accessory sensor (Terratrip, Brantz, Alfa, bicycle, etc.).
Please contact us for more probe installation details. Further documents are available at the following links:
- Odometer factsheet: click here
- Odometer manual in English: click click here
- Odometer manual in Italian: click here
