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Speed on speedometer differs from power fc?

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Old 11-28-03 | 05:39 PM
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0110-M-P's Avatar
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Speed on speedometer differs from power fc?

I was on my way home from rotorsports racing today and ran out 4th gear on a country road. My speedometer said 128mph or so an 7000rpm, but my PFC read 190 kph or 118mph. I still have the stock wheels on it and very close to the same stock tire size and no upgraded gears or anything. What could be causing such a big difference in the two?
Old 11-28-03 | 05:42 PM
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Then your speedo is off. See if it's just offset by 10 mph. AFAIK the PFC and speedometer use the same signal source - vehicle speed sensor.
Old 11-28-03 | 06:40 PM
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Speedometers are known to be generous, it keeps people from speeding too much . This is exaggerated as speed increases. If it's off by 10mph at 118mph, thats roughly 9.1%. At more normal speeds, say 40mph, it'd be off only 3.6mph.
Old 11-28-03 | 06:44 PM
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Re: Speed on speedometer differs from power fc?

Originally posted by 0110-M-P
I was on my way home from rotorsports racing today and ran out 4th gear on a country road. My speedometer said 128mph or so an 7000rpm, but my PFC read 190 kph or 118mph.
Doesn't fourth top out closer to 140? Have I been reading my speedo wrong? Maybe it's off a bit.
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