Speedometer Question

Wingnut said:

I've got an '06 GT with everything. When my speedo reads 80 MPH I'm not passing anyone on the local interstate--I figure their doing about 65. When I'm passing cars my speed is at 90-95 MPH but it doesn't feel like I'm going that fast. I haven't changed the rearend or tires. Can anyone relate to any of this??
And how do you attach a pic on the right side here??
Wingnut

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And you live in Cinci... dude... if your not doing 80 on I71 or I75 thru there... you get ran over.

Try to see if you can find one of those "your speed is" signs... or have a buddy pace you on the interstate and talk over your cell phone and compare.

If you are off... possibility your speed sensor might have gone bad. Which may screw up you ABS as well.

Yeah--you might be right--but down on I75 thru town doing 80-85 and only keeping up with traffic doesn't seem reasonable. I guess having a side by side speed test would be the most accurate way to check--I'll work on that and get back.
Wingnut

wingnut you think anyone really does 65 on the interstate?

look in the phone book u can find places that will give u exactly how far off it is i only payed 10 dollars to get my checked on the truck

if you have a friend with a gps you can see if you are off or just "used" to the speed:winks

I've dyno tested my GT at work and found the speedo off by 4 KILOMETERS hr. Can you say Canada, Eh?
Carlos.

A quick and easy way to see if it's accurate: Set the cruise for 60mph and click off a stopwatch as you pass a mile marker on the side of the highway. Stop the clock when you get to the next one. It should be 1 minute. If it's more, your speedometer is reading fast, if it's less, your speedometer is reading slow. To get an exact reading for how far off it is, you'll have to be better at math than I, or use one of the other methods above.

Tilden's 06 said:

if you have a friend with a gps you can see if you are off or just "used" to the speed:winks

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I concur...borrow a GPS...it will give you your speed to the tenth MPH.

Speedometer question

If you are a AAA member they have a calibration unit that periodically comes around to the different offices. They callibrate the speedometers on a lot of police and highway patrol units as well.