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The mkiv Supra Owners Club

Speedo and odometer problem


Ferlex
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Hey guys, so I recently got my kmh to mph converter fixed and now my speedo is ready much higher mph than normal. It's about 15 mph off, I noticed that travelling at 85 mph gps speed shows on the speedo as 100. The odometer also goes up according to the 100mph on the speedo so I did a trip which was about 45 miles and I recorded that on the speedo it showed it put about 80 miles on there. Does anyone know how I could fix this? If it helps I have some faces on the speedo.

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Indeed you need one that is setup for your rolling radius. The speed sensor (in the gearbox I think in our case) sends pulses which are turned into speed depending on the frequency. Obviously may vary depending on the vehicle/speed sensor.

I use a SpeedM8 which was setup by the maker for a MkIV on standard wheels and reads pretty much bob on with the GPS. It over reads when using the Lexus 18's.

I believe some limiters had some adjustment where you could go out with a GPS and fine tune?

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