Hi Guys, I 've still been unable to resolve the inaccuracy in my Odometer. The cars been off the road for 10 months having major bodywork and a window's out respray... hence the timescale. My car is an Oct 87 220 turbo with a 180 MPH speedometer. I had the usual problem with the broken gear wheel which I replaced on various recommendations with a pink 20/23 wheel. I have a picture of the old wheel in place with the missing teeth which allows me to check albeit slightly inaccurately that the original was also 20/23. The odometer is recording about 38% high while the speedo is pretty well bang on correct. I sent the speedo head to a so called expert in Holland to get the instrument calibrated. He advised that some of the capacitors in the PCB had failed, [common problen with VDO electronics of that age] replaced them and then recalibrated the instrument. I believe he recalibrated the PCB and perhaps the speedo.... but not the Odometer. this cost in excess of £300 with customs carriage etc. All to no avail still recording 38% high.
As there is a single signal from the gearbox sender to the speedo head and the speedo is correct, I assume the sender is OK. if the guy in Holland did his job correctly, I can only assume the gearing is wrong. The 20/23 gives a 0.87:1 ratio and the next wheel down is 19/24 which is 0.79:1 still wouldn't correct the 38% error.
Where should I go from here?
Anyone got a spare turbo 180 MPH speedo head c/w turbo gauge? My car has 95000 miles on it
Eddie
87 944 Turbo
2007 Cayman S
As there is a single signal from the gearbox sender to the speedo head and the speedo is correct, I assume the sender is OK. if the guy in Holland did his job correctly, I can only assume the gearing is wrong. The 20/23 gives a 0.87:1 ratio and the next wheel down is 19/24 which is 0.79:1 still wouldn't correct the 38% error.
Where should I go from here?
Anyone got a spare turbo 180 MPH speedo head c/w turbo gauge? My car has 95000 miles on it
Eddie
87 944 Turbo
2007 Cayman S
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