Wrong Odometer reading after mod

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Apr 12, 2010 | 02:53 PM

#11

urbexHHR

Senior Member

Joined: 02-16-2009

Posts: 6,038

From: Frankenmuth/Flint, MI

Quote:

Originally Posted by solman98

I'd trust the GPS over any speedo anyday. Mine actually showed dead on with my GPS with the 224/40R18's I had on before, and they were indeed shorter than the 215/55R16's stock, so the speedo should have shown fast. Speedometers calibrations are just like any other guages, rarely dead on.

No, I agree that speedometers aren't always right. I just don't know if I trust mine since it happens to be exactly 1mph faster than each of our cars (excluding the truck...which I KNOW the speedo wrong!

)

Apr 12, 2010 | 04:04 PM

#12

esmarkey

Senior Member

Joined: 08-06-2008

Posts: 1,761

From: Grand Haven, MI

Quote:

Originally Posted by CrazyCarKid

But how do you know your GPS is right? My speedo and GPS are now right on, but the miles on the GPS and the odometer are off. And, the GPS is off 1mph in all of our cars.

Not sure how you can say the GPS is off in our cars???
I find the GPS to be superior to any speedometer.

Both of my HHRs are off by 2 - 3 MPH on the speedo.
I am sure that has something to do with the fact that they read 2 - 3 MPH when the car isn't even running

Apr 12, 2010 | 10:43 PM

#13

sleeper

Platinum Member

Joined: 01-09-2007

Posts: 16,081

From: SE USA

I don't sweat the small stuff like this.. I mean speed-O will change as a tire wears, & run faster.. No biggie..

Apr 13, 2010 | 11:00 PM

#14

IgottaWoody

Senior Member

Joined: 01-13-2008

Posts: 4,708

From: Washington State, where it rains

Quote:

Originally Posted by esmarkey

So does mine..................nice buffer for when your not paying attention to Johnny Blue....

Apr 14, 2010 | 07:59 PM

#15

Sno White

Senior Member

Joined: 12-24-2008

Posts: 717

From: N/A

Quote:

Originally Posted by CrazyCarKid

... but the miles on the GPS and the odometer are off. And, the GPS is off 1mph in all of our cars.

I would imagine the GPS shows fewer miles than the Odometer! Mine does. My theory is the GPS measures points in time and when on a curvy road, the curves are broken down into shorter line segments. So on a curvy road the GPS should also show a slower speed than an "accurate" speedometer. How bad this inaccuracy is would depend upon how often the GPS updates and calculates position and speed.