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Car Forum / Volvo Cars / January 2005Speedo sender unit interchangability
HI ALL how does the Speedo work by impulse or mechanical means .Can you alter the reading of the cars speed by replacing a sedans Speedo module on the differential with one from a wagon .Or are they the same ? I have a 740 turbo with 205 -55-16 tyres or tires and would like to go to 225-60- 16 a more common size here and cheaper .My Wife has 195-60-15 on her 740 turbo could we go 205-60-15 a much cheaper tyre tire to buy , using the sender unit on the back axle .We love our Volvos so we got our son a 1990 240 to learn on and boy its fun to drive ,with 195-70--14 tyres . Same question again is 205 or 215 -60-14 a reasonable conversion using the rear diff sender .Thanks from down under where the water flows the other way or does it ? >"John Robertson" <johnnr@optusnet.com.au> wrote in message news:41d50ab0$0$3855$afc38c87@news.optusnet.com.au... >HI ALL how does the Speedo work by impulse or mechanical means .Can you alter the reading of the cars speed by replacing a sedans >Speedo module on the differential with one from a wagon .Or are they the same ? >I have a 740 turbo with 205 -55-16 tyres or tires and would like to go to 225-60- 16 a more common size here and cheaper .My Wife has >195-60-15 on her 740 turbo could we go 205-60-15 a much cheaper tyre tire to buy , using the sender unit on the back axle .We love our >Volvos so we got our son a 1990 240 to learn on and boy its fun to drive ,with 195-70--14 tyres . >Same question again is 205 or 215 -60-14 a reasonable conversion using the rear diff sender .Thanks from down under where the water >flows the other way or does it ? All 700 series cars use an electronic speedo with a sensor in the rear axel unit. The sensor is the same, but the calibration of the speedometer varies with tire size. 240's used a mechanical cable speedo until '85, after that they got the same electronic setup as the 700's. thanks.. so that means that the speedo can be adjusted by the sensor type ? > >"John Robertson" <johnnr@optusnet.com.au> wrote in message > news:41d50ab0$0$3855$afc38c87@news.optusnet.com.au... [quoted text clipped - 18 lines] > with tire size. 240's used a mechanical cable speedo until '85, after that > they got the same electronic setup as the 700's. > thanks.. so that means that the speedo can be adjusted by the sensor type > ? I wouldn't think so. Typically reluctor sensors are just a winding on a magnetized core, and they count the number of teeth that go by. A new sensor could change the output level but can't change the rate. Mike >> >"John Robertson" <johnnr@optusnet.com.au> wrote in message >> news:41d50ab0$0$3855$afc38c87@news.optusnet.com.au... [quoted text clipped - 20 lines] >> that >> they got the same electronic setup as the 700's. > thanks.. so that means that the speedo can be adjusted by the sensor type ? No, the calibration is in the speedo itself, I haven't looked into the details though, it might have a potentiometer you can adjust, or it might use soldered or plugged jumpers, you'd have to check. |
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