Speedometer way off
Thread Starter
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Amateur
Joined: Jan 2005
Posts: 48
Likes: 0
From: Fort Bragg NC
Speedometer way off
I was driving the other day and noticed that while my speedometer read 70, I was being passed by quite a few people. I fired up the GPS and while my truck read 70, my GPS read 60. I have been comparing my GPS speed and my Durango speedometer, and it seems that the speedometer is way off. I am pretty sure it's the GPS thats right since everywhere I go, my speed reading, the speed limit and people passing me just doesn't seem right. So, how would I go about fixing this? I seem to be off 10mph or so, I am assuming that my mileage counter is also off, thus my mpg calculations are off, etc.....
THE ULTI-MOD
Joined: Jan 2007
Posts: 19,797
Likes: 36
From: Union NJ
you put different than stock sized tires on the truck didnt you? you probably just need to have the correct tire size programmed into the computer, a superchips handheld will do it, or you can take it to a shop and some of them can do it for you.
Yep shrp nailed it. IIRC you said you have 35" tires on it before and that's about right to have a 10mph off on the speedometer. Make sure to get this fixe soon because you're puting more miles on the odometer than you're actually driving!
Registered User
Joined: Jan 2011
Posts: 42
Likes: 0
From: Dallas, Tx
I thought this was the opposite.
With a bigger tire, your actually reading LESS than what you are driving. For instance, I just put 265/70/16 on my truck, and it now reads 60MPH when my GPS shows 66 MPH.
Wouldn't his speedometer read a lower rate of speed with bigger tires, putting less mileage on his D?
With a bigger tire, your actually reading LESS than what you are driving. For instance, I just put 265/70/16 on my truck, and it now reads 60MPH when my GPS shows 66 MPH.
Wouldn't his speedometer read a lower rate of speed with bigger tires, putting less mileage on his D?
I thought this was the opposite.
With a bigger tire, your actually reading LESS than what you are driving. For instance, I just put 265/70/16 on my truck, and it now reads 60MPH when my GPS shows 66 MPH.
Wouldn't his speedometer read a lower rate of speed with bigger tires, putting less mileage on his D?
With a bigger tire, your actually reading LESS than what you are driving. For instance, I just put 265/70/16 on my truck, and it now reads 60MPH when my GPS shows 66 MPH.
Wouldn't his speedometer read a lower rate of speed with bigger tires, putting less mileage on his D?
Thread Starter
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Amateur
Joined: Jan 2005
Posts: 48
Likes: 0
From: Fort Bragg NC
Thanks all. I figured the tires did it, but wasn't sure how to correct the problem. To clear a little confusion up, I had 35's and went down to 33's. The gps is showing me going slower than speedometer. Will have to invest in a superchip module now.
