Speedo Corrector Affects Odometer Readings

摘要

I built and installed the Speedo Corrector Mk2 from the December 2006 issue in a rebuilt 1977 Porsche 911 which had the wheels changed from 15-inch to 16-inch.I have calibrated the speed against a GPS unit and it is accurate at lOOkm/h and a little under at 50km/h(48).The odometer reads under by about 300 metres on a measured 5km stretch.