ericdwong

After working on my transmission, I've found out that the speedometer is driven electronically, and not by a cable. Basically theres a pinion gear which reads off of the final drive gear (where the differential is that connects to the driveshafts) in the transmission that sends an electrical pulse to the speedo. Now, I was lookin at modding my honda cbr600F4I webpage and came across this http://www.rc51.org/data2racing/jim.htm . Basically what this is is a speedometer modifier if you changed the gear ratio, the rear sprocket, tire size etc. I know that Jeeps have gears in their speedos, so when those jeepers change their tire sizes to those huge monster tires, they just replace a gear to match. While I dont know of anybody here who has 33" size tires on their maxima's or 13" wire rims, I know that some of us have speedo errors either running 225 50 16 tires or some other oddball sizes. I'm not sure how the speedo's electrical signal works, and I dunno if the FSM says how it works, but theres gotta be a way to adjust the speedo.

Badaxxima

Usually you have to either replace the ring or re-tune the ECU to compensate. Usually there's an electrical sensor straddling the spinning wheel. The wheel is embedded with a donut magnet that has a small break in it. Every time the sensor picks up the break in the magnetic field, it counts it as one revolution. This is very basic and may not be entirely correct for Maximas. Anyone please feel free to chime in.