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= Resolved threads
We are using a HGT sequential gearbox, with Life Racing ECU, paddle shifting using R/L wheel speed sensors, the left rear wheel keeps dropping out and therefore the box doesn't shift on command. We have replaced the sensor multiple times, checked the wiring, changed the gap from 1.7mm to 1.0mm (spec is no more than 2.0mm to the tone ring. What we have found is that the scope on that wheel measured at the connector close to the sensor has a slight curve to the leading edge, swapped out the sensor, then the tone ring and it still reads a curved vs. sharp edge. Any thoughts?
Attached Files
Screenshot-2025-04-04-at-7.10.53PM.png
- Screenshot-2025-04-04-at-7.11.05PM.png
- Screenshot-2025-04-04-at-7.12.17PM.png
Hi Douglas,
Sounds like a tough one.
Are you able to configure the sensor to trigger on the falling edge leading edge and have you considered shielding the signal wire from noise factors?
I would consider using a smaller pull-up resistor. The internal resistor built-into the input circuit is probably too large of a value. Adding either another of the same value, or something smaller would make that edge react faster.
Since you have the ability to see the result, try a few different values to see if anything helps.
I would be more concerned with run out on that trigger wheel. It looks like your sensor has had contact with it previously.
