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pfc vehicle speed incorrect

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Old 12-28-13, 12:05 PM
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pfc vehicle speed incorrect

Hi!
I have a 1992 fd3s with a apexi pfc
On the commander it shows my vehicle speed is about double than what my speedometer is showing. Can anyone help me understand why it is doubleing my speedo and how to fix this? :-)

Best regards Frank :-D
Old 12-28-13, 06:20 PM
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I have the same issue.. When I hit 100km/h+ there is a slight difference between the PFC and my speedo.
Old 12-29-13, 11:16 AM
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When i Am at 100kp/h my commander shows around 200+kp/h
Old 12-29-13, 01:33 PM
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little info that I found.
https://www.rx7club.com/power-fc-for...needed-166439/
There IS a Power FC forum so grab some Coffee,gain some posts and knock yourself out with some threads!!
I don't mean that sarcastically.I Did that when I first got here and Hell,..I am a sponge.
I can't dance but I can wrench an FC..lol!

By the way if you read that thread it mentions FD.
Old 12-29-13, 04:26 PM
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Originally Posted by Senna88
I have the same issue.. When I hit 100km/h+ there is a slight difference between the PFC and my speedo.
Stock wheels and tire size?
Old 12-29-13, 05:13 PM
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Yes, all original wheel size.
There is something fishy about the speed on my commander... Its dobling my actual speed.. Anyone???
And sometimes my speedometer is jumping up and down like 10-20km/h

This is pretty anoying! Help needed!
Old 12-29-13, 07:14 PM
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Frank.
As I mentioned there IS a Power FC forum section.
If you gain posts and put up your question there you may get more definitive answers.
This NEW TECH section is a mixed bag of problems and cars that usually stock,so it is not always the best place to post questions on highly modified cars.
Old 12-29-13, 07:34 PM
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And I was responding to Senna88..he indicated a much smaller differential.
Old 12-31-13, 02:43 PM
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Originally Posted by Sgtblue
And I was responding to Senna88..he indicated a much smaller differential.
Running bigger wheels & tires. But wouldn't the speedo & PFC still be both wrong in that case?
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