Exact speed on your 147
Yestarday i did a test on my 147 1.6 (120 HP) with a GPS (Garmin plus 3 ) to find out the speed difference between the tachometer in the car and the GPS values.
5.gear 5500 rpm 180 km/h on the tacho,but 170 km/h on the GPS.
5.gear 4500 rpm 150 km/h on the tacho,but 141 km/h on the GPS.
5.gear 3500 rpm 115 km/h on the tacho,but 106 km/h on the GPS.
what is here wrong?Which one is correct: GPS or the tachometer in the car.Do you have any experience with 4500,5500 rpm in your 147 ? What is your speed at this rpms ? Similar to mine tacho or to that of the GPS?
thanks in advance,