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If it's not really about tuning or wiring. Then it belongs in here.
= 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-v2.10.53PM.png
- Screenshot-2025-04-04-at-7-v2.11.05PM.png
- Screenshot-2025-04-04-at-7-v2.12.17PM.png
Do other wheels read differently? Definitely no signal to earth or closed circuit faults in the loom?
You could try spacing the target wheel further off the hub and backing the sensor off the same amount.
For the purpose of engine/shift control I would have thought a single gearbox output speed would be more appropriate anyway.
Thank you Slides for responding, the left rear is the only one doing it. I inquired about the use of the toothed gear on the rear of the gearbox, however because the differential isn't locked, it is good to tell the computer that things are 'right' to initiate a shift (in corners, etc). I am going to rewire it from the PDU to the rear wheels with shielded wire to see if we can eliminate that curve on the leading edge and go from there. Thanks. REspeed.
