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My speedos a little optimistic

 
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Old 31 Jan 2006, 05:04 am
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Default My speedos a little optimistic

I have a feeling that my speedo is faster than my car actual speed

I was going on some mountain road and I'm sure I was only going 40mph while my speedo is showing 60......everythings OEM so can't be the part most be some speedo problem
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Old 31 Jan 2006, 11:58 am
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Quote:
quote:Originally posted by Ctown

I have a feeling that my speedo is faster than my car actual speed

I was going on some mountain road and I'm sure I was only going 40mph while my speedo is showing 60......everythings OEM so can't be the part most be some speedo problem
Were you going up-hill?
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Old 31 Jan 2006, 12:04 pm
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Quote:
quote:Originally posted by Ctown

I have a feeling that my speedo is faster than my car actual speed

I was going on some mountain road and I'm sure I was only going 40mph while my speedo is showing 60......everythings OEM so can't be the part most be some speedo problem
Well... 2 ways to address that...

do you know a friendly cop with a radar gun?

Or a passenger, a watch and a measured mile. Have the passenger time how long it takes to cover a measured mile at a steady (indicated) speed. Then do the math.

3600
divided by the number seconds it takes to travel one mile
= speed in mph.

60 secs= 60mph
80 secs= 45mph
90 secs= 40mph


The factory speedos are typically calibrated to read =slightly= high, like 5 or so mph.



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Old 01 Feb 2006, 12:34 am
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The speedomoter is directly linked to odometer. So if you drive from one mile marker to the next mile marker: and your odometer showes less distance than you've actually traveled then your speedometer will read slower than your actual speed. If it showes more distance than you've actually traveled then your speedometer is faster than your actual speed.

This usually happens when you change tire sizes, and can be fixed by a new speedometer gear.


(Changing to larger tires without changing speedometer gears can result in a speeding ticket, but if you explain why, it can be reduced to a mechanical "Fix it" ticket.)
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