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Speedo is waaaaaay off.

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Old 08-31-05, 12:30 PM
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Speedo is waaaaaay off.

Hey guys, it's been awhile since I've posted a question, and I thought it was about time again.

I've got a NA 87 and its speedo is just horrible. When it says I'm doing 80, I'm doing 71, it's all basically off, starting at about 55 or so. I don't remember everything, but it wasn't exactly great to see, you know?

So, any ideas about what I can do to fix it? Can I do anything on my own, or should this be one of those "leave it to the guys that know what they are doing" jobs?
Old 08-31-05, 12:38 PM
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Low profile tire size can do that.
Old 08-31-05, 12:41 PM
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Running the exact tire size recommended.
Old 08-31-05, 01:27 PM
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My speedo is off by 5 mph and i'm on the 15 inch wheels with stock tire size.
Old 08-31-05, 02:15 PM
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My speedometer reads low, too. (6-8mph as compared to those "Your Speed Is..." radar unit things, as I drive by.) And compared to my everday car, the odometer undereads by 14%. (100 miles in my Ford = 86 miles in the RX7.) I'm guessing that someone swapped in a different rear end, perhaps from an auto-trans car???
Old 08-31-05, 02:30 PM
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I got out of a speeding ticket once when I told the Judge "I thought the speedo was off, but I didn't know how much."
"Can you suspend this ticket if I get it calibrated?"
"Where do I take it for calibration?"

He said: "Bring me the receipt, & I'll suspend the ticket."

It only works once..
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