Speedometer Wrong, inconsistently off by more than >10%
#1
ChumpCar**Apex of Failure
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Speedometer Wrong, inconsistently off by more than >10%
I have been having a problem with my FD (93 R1) ever since I got it over a year ago. The spedo is sometimes wrong. Sometimes its correct, sometimes its way off. Today on the way into work, it was reading 127kph. Way faster than I was actually going. I though, ohh hay, the PFC has a speed gauge. It read 97kph which I think was my actual speed. Last summer, I did some tests with a GPS unit and found the spedo to be about 10% fast. It's clear to me now that the spedo and the PFC get their speed from different places.
It's inconsistent. Sometimes it's even correct. I have witnessed it move without the car changing speeds too. Mostly on the freeway. Maintaining my speed, I will see it move from 75mph down to 68mph. The difference seems to get worse the faster I go, which makes me think it something mechanical.
I do have slightly large diameter wheels on now, but nothing that would account for 10% difference between the gauge and reality.
How does the spedo get its signal? How can I track down the part causing the problem?
It's inconsistent. Sometimes it's even correct. I have witnessed it move without the car changing speeds too. Mostly on the freeway. Maintaining my speed, I will see it move from 75mph down to 68mph. The difference seems to get worse the faster I go, which makes me think it something mechanical.
I do have slightly large diameter wheels on now, but nothing that would account for 10% difference between the gauge and reality.
How does the spedo get its signal? How can I track down the part causing the problem?
#4
ChumpCar**Apex of Failure
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Can anyone think of a good way to confirm that it is the gauge cluster without swapping it out with a known good part? I'd hate to drop the money on the "new" part and not have it fix the problem.
#5
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I know on the gauge face itself there is a marking to calibrate the gauge. Its like "3000rpm @ 65mph" or something. I dont remember if the same marking is on the face of the kilometer gauges. I have to check with my km one to confirm. Anyone have a jdm one laying out of the cluster to help parid out?
#6
SideWayZ The Only Way
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i thought that too, but my gauge actually is off aswell, , but before i sent it in to rammy to get it redone because my odometer wouldnt turn on, i checked it and the GPS says i was going like 74 when i was going about 82 on the gauge. i asked him to calibrate the speedo too, short story it still does it, but the odometer works
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#8
ChumpCar**Apex of Failure
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I know on the gauge face itself there is a marking to calibrate the gauge. Its like "3000rpm @ 65mph" or something. I dont remember if the same marking is on the face of the kilometer gauges. I have to check with my km one to confirm. Anyone have a jdm one laying out of the cluster to help parid out?
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