speedometer is off by 12mph
does anyone know what would cause a speedometer to be off by 12mph? I have larger tires (195 pro comps)
I forgot to plug in my radar detector this morning, an started to head to work. I had my cruise set on 70mph exactly (thats the speed limit on the highway were i live) an i got pulled over for doing 82mph. I got a warning. What does ford charge to have it adjusted and would would cause it to change? |
on the tail housing you should have a speedometer gear, pull the one you have and count the teeth. maybe someone else will come along and give u an idea as to which one u need after that?
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Well, the speedo is reading about 15% too low, so you need a speedo gear that is about 15% smaller than what you have now, or as close as you can get to that.
Now, I have no idea what speedo gear you have in there now, but for example, let's say you have a 32-tooth gear now. 32-(32x0.15) =27.2, so get a 27-tooth speedo gear. If you have a 39-tooth gear, 39-(39x0.15)=33.15, so get a 33-tooth gear. And so on and so on... Hope that helps.... |
Originally Posted by Ranger7489
(Post 3226704)
does anyone know what would cause a speedometer to be off by 12mph? I have larger tires (195 pro comps)
You need a speedo gear with fewer teeth on it. That'll correct your speedometer. -Joe |
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