Tricks

Why is it so important to check the probes?

The probes are the sensors that capture the movement of the wheels and transform it into distance and speed data.

Therefore, the proper functioning of the probes is vital for the accuracy of your Blunik.

It is necessary to perform verification:

• When installing probes for the first time
• When changing wheels
• When preparing the vehicle for a rally

Verification helps detect possible reading errors and ensures the probes will measure correctly on rally day.

 

What preliminary steps are required?

Before verifying, make sure you have correctly configured the parameters:

1. Probe selection:

• - Sensor Selection (Blunik II). Both + FW
• - PROBE Mode (Blunik II PLUS). Both + Fast Wheel

2. Probe voltage. Parameter: SENSOR TRIGGER (Blunik II) or PROBE TYPE (Blunik II PLUS)

• - Magnetic: 7.5 V
• - Inductive: 4.8 V

 

How to access the verification screen?

1. Go to the Calibration parameter.
2. Press the MODE key to access the probe verification screen.

This screen has several important indicators:

• R and L: Show the reading of the right (R) and left (L) probe. If the bars move, the probes are working and correctly connected.
• Errors (00): Next to R and L are two digits. They must remain at 00. Any other value indicates reading errors.
• Pulse difference: On the right, a numeric value shows the difference in pulses between the two probes. You can reset it to zero with the ZERO key.
• EV or ••: On the Blunik II PLUS, the letters EV appear if the connection is correct. If two dots (••) appear, it means poor connection or no probe connected.

All Blunik models have the probe verification screen.

Practical tests to validate the probes

Now that you know how to read the screen, here are three practical tests to verify that the probes are working properly:

Test 1: Fast and straight (e.g., highway)

• Access the verification screen.
• Drive straight and check:
• That the R and L bars move.
• That the error values remain at 00.
• That the pulse difference stays low or stable.
• If you press ZERO, the counter resets, and while driving straight, it should change very little.

If one wheel shows more pulses than the other, you are either turning, or there is an issue. Analyze the situation and act to solve it.

Test 2: Fast curves (e.g., roundabout or rally stage)

• Perform maneuvers with sharp curves, putting more load on one wheel than the other.
• Check if reading errors appear.
• If any value different from 00 appears, note when it happened to review the mechanical installation of the probes.

Test 3: Temperature (optional, for advanced users)

• Drive 10–15 km with hard braking to heat up the brakes.
• If the probe overheats, the message •• may appear instead of EV.
• If this happens, the probes must be repositioned away from the wheels. In some cases, on 4x4 vehicles, the best option may be to place them on the driveshaft.

Other causes of error and common messages

Reading errors may also be caused by:

• Having one wheel with one magnet and the other with two.
• Having two magnets, but the probe reading one or two pulses per rotation.
• In both cases, you’ll see the error digits increase instead of staying fixed at 00.

 

Common messages:

R SENSOR FAIL or L SENSOR FAIL: Error detected in one of the probes.

FAST: One wheel sends more pulses, and the FAST WHEEL algorithm is activated.

 

Blunik: Precision down to the meter, thanks to the probes

Blunik is a demanding device. Where other systems tolerate erroneous readings, Blunik detects them because precision is key.

The verification function is a powerful tool to achieve the level of reliability required for regularity.

 

Remember: To compete in regularity with precision, you need two well-installed and verified probes.

 

Want to know more?

Check the Blunik II PLUS manual (page 37) for a summary of parameters.

Explore our articles, manuals, and tips to get the most out of your Blunik.

 

Our final advice

Good probe verification can make the difference between a successful rally and a frustrating one.

Always check them before a race to avoid problems during the event.

With Blunik, you have the precision and the tools to do it right.

 

Already own a Blunik? Then try the probe verification function today.

Don’t have one yet? Discover everything it can offer to take your regularity to the next level.