[keanecn]

I cannot read the trigger signal of the motorcycle using the 9926 VR Conditioner, but it can read the trigger signal of the car. What's wrong? The VR Conditioner is V3 version, and I use the trigger of the motorcycle GY6, which does not recognize the signal. The RPM is 0, but the RPM signal can be read using the car. Is the trigger signal voltage of the motorcycle relatively low? If adjustments are needed, where do they need to be made?

[digmorepaka]

I cannot read the trigger signal of the motorcycle using the 9926 VR Conditioner, but it can read the trigger signal of the car. What's wrong? The VR Conditioner is V3 version, and I use the trigger of the motorcycle GY6, which does not recognize the signal. The RPM is 0, but the RPM signal can be read using the car. Is the trigger signal voltage of the motorcycle relatively low? If adjustments are needed, where do they need to be made?

MAX has a timeout to prevent false pulses. If you are using basic distributor pattern, your cranking RPM could be so low that it times out. the GY6 sensors also share ground with chassis, this is bad for noise, especially a high impedance input like the MAX, you want it to be floating and only connected to the conditioner. As far as VR sensors go, the one the GY6 gives a pretty strong output, it's actually enough to trigger an SCR gate directly. You may want to look at using a hal effect sensor, or using the EFI version flywheel that has a 36-1 trigger wheel builtin.

[keanecn]

I cannot read the trigger signal of the motorcycle using the 9926 VR Conditioner, but it can read the trigger signal of the car. What's wrong? The VR Conditioner is V3 version, and I use the trigger of the motorcycle GY6, which does not recognize the signal. The RPM is 0, but the RPM signal can be read using the car. Is the trigger signal voltage of the motorcycle relatively low? If adjustments are needed, where do they need to be made?

MAX has a timeout to prevent false pulses. If you are using basic distributor pattern, your cranking RPM could be so low that it times out. the GY6 sensors also share ground with chassis, this is bad for noise, especially a high impedance input like the MAX, you want it to be floating and only connected to the conditioner. As far as VR sensors go, the one the GY6 gives a pretty strong output, it's actually enough to trigger an SCR gate directly. You may want to look at using a hal effect sensor, or using the EFI version flywheel that has a 36-1 trigger wheel builtin.

Hello, thank you for your reply. I have tried the CG125 trigger, which has two wires, but there was no response. Instead, when I used an automotive trigger, it produced a signal, but it was not very sensitive. There was no RPM at low speeds; it only worked when the engine was running at 3000 RPM, and it had to be very close to detect anything. I did not test this in a vehicle; I just did a simple test on a tabletop, so interference can be ruled out. The Hall effect sensor I used worked very well, but it involves modification and internal space issues, so I still want to use the original vehicle's VR. Therefore, I am now looking for a simple, sensitive, and effective VR circuit.

[PSIG]

Borderline VR setups can use a sensitive circuit, but often require 'tuning' of the circuit to operate full-range, which can be frustrating. While some can read to 0.2V or less, most require about 0.6V minimum signal at lowest speeds (cranking). I would test your signal strength to know what level you need to read, and what options are available for that. It is a balance between sensitive enough to read low, and not so sensitive that it fails at high speeds (high signal voltage).

An option you may want to consider is a Hall element mounted separately on a small piece of PCB. A common TO-92 or SOT23 sensor just needs connections and some method to hold it in position (3D printed poly/nylon/etc housing, putty, epoxy, hi-temp RTV, etc). There are some threads here using this method. Smaller than a fingernail, they can fit many tight conditions without big holes or mods.

• What is your trigger pattern?

[keanecn]

Borderline VR setups can use a sensitive circuit, but often require 'tuning' of the circuit to operate full-range, which can be frustrating. While some can read to 0.2V or less, most require about 0.6V minimum signal at lowest speeds (cranking). I would test your signal strength to know what level you need to read, and what options are available for that. It is a balance between sensitive enough to read low, and not so sensitive that it fails at high speeds (high signal voltage).

An option you may want to consider is a Hall element mounted separately on a small piece of PCB. A common TO-92 or SOT23 sensor just needs connections and some method to hold it in position (3D printed poly/nylon/etc housing, putty, epoxy, hi-temp RTV, etc). There are some threads here using this method. Smaller than a fingernail, they can fit many tight conditions without big holes or mods.

• What is your trigger pattern?

Hello! Thank you, expert. The trigger voltage for my 125c motorcycle is quite low, about 0.7V at idle, which is insufficient for signal recognition. I've seen some trying to use something like LM358 on forums, but I can't quite understand the circuit diagram. The trigger setting is a 24-2 tooth miss. Also, in version 0.3 of VR, there are jumper wires from JP4 and JP5 to a 1K resistor. What is that for? And if I adjust this resistor value, can I regulate the signal sensitivity? If I use a Hall element, will it be affected by the high temperature inside the engine? I know that using a Hall element to sense a magnet works too, but I'm worried that the high temperature might cause the magnet to fail and stop working.

[PSIG]

The trigger voltage for my 125c motorcycle is quite low, about 0.7V at idle, which is insufficient for signal recognition.

0.7V should be enough. Are you sure it is not reading the teeth, or just not correctly?

The trigger setting is a 24-2 tooth miss.

Multiple missing teeth (-2 or more) is sometimes a troublesome pattern with VR sensors and the MAX chip as below.

Also, in version 0.3 of VR, there are jumper wires from JP4 and JP5 to a 1K resistor. What is that for? And if I adjust this resistor value, can I regulate the signal sensitivity?

The jumpers are for digital signal pullup. Not used for VR signals, and therefore not usable for signal sensitivity.

If I use a Hall element, will it be affected by the high temperature inside the engine? I know that using a Hall element to sense a magnet works too, but I'm worried that the high temperature might cause the magnet to fail and stop working.

Automotive-grade Hall sensors are temperature resistant. I would suggest using an automotive-rated part. They are also typically switching (digital, not analog) and back-biased, meaning they have a magnet mounted behind the sensor to read ferrous targets. Many vehicles in wrecking yards have these common sensors, or online replacements for them, or build your own with available sensor elements from electronics suppliers. Far too many options to list here.

Seeing that this is a 24-2, some wheels and VR sensor combinations have not been readable by the MAX992x conditioners, for the reason @digmorepaka gave. Over-simplified, the MAX chip is a little too 'smart', and does not read some teeth, especially after missing tooth gaps. My concern is similar, that it is reading most of the sensor signals, but is not synchronizing.

>> In order to determine this, I would ask for you to post two logs: a Tooth Log, and a run log of cranking. Note that a registered version of TunerStudio is required to take Tooth Logs. If a registered version is not available to you, an oscilloscope pattern of the sensor signal IN and sensor signal OUT of the VR conditioner is also very useful.