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Calibrate speedometer? 700 1988

posted by  someone claiming to be Volvouser on  Sat Jul 3 10:34 CST 2004 [RELATED]

Hi

I have noticed that my speedo indicates some 5-10% too high, i.e the the needle shows 120 km/h when i'm actually travelling around 112 km/h according to my GPS.

In my former 240 (which had an exact speedo!) the rev counter was erratic and that was due to a faulty trimmer. I hooked the rev counter up to a signal generator and replaced the trimmer with a resistor which achieved an exact indication. (Math; 3000 rpm equals 50 r/s. 4 cyl, 4 stroke engine equals 50*4/2=100Hz)

However, does anybody know if there is a trimmer inside the 740 speedo as well? Calibration should then be just as easy using the signal generator. I just don't want to dismantle the instrument panel just to find that there are no calibration possibilities!

TIA!






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New Calibrate speedometer? [700][1988]
posted by  someone claiming to be Volvouser  on Sat Jul 3 10:34 CST 2004 >


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