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  #1  
Old 07-23-2010, 03:34 PM
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Default Hypertech programmer question

I have the MAX ENERGY Hypertech for my 5.2. I am currently on 35'' tires, so I programmed the truck's speedometer for 35'' tires. When I hit the highway, it seemed like it was saying i was going much faster than I really was.

When I got home, I measured my tires. From the ground to top, they were only measuring around 33''.

Have my tires wore that much?? The air pressure is fine.


ANYWAY, I re-programmed for 33'' tires. Should I program for 33'' tires or 35'' tires?
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Old 07-23-2010, 05:18 PM
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What's the actual size on the side of the tire ?
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Old 07-24-2010, 06:16 AM
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Default

You should set it as 33" tires on the programmer.

What kind of tire do you have? What width tire and rim? How many miles on the tires?

Tire manufacturers will sometimes over mark their tires: listed as a 35" tire but actual size could be as small as 34.6". Some also under mark their tires too.

If you have a 35x9.5" wide tire and you put it on an 8" rim your going to have a shorter tire than if you had a 35x12.5" tire on a 7" rim.

These could all be compounding reasons why your tires measure in at ~33". Its not hard when you think that every 1/4" loss on one side of the tire is a 1/2" loss on the whole tire.

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Last edited by 92XJCowboy; 07-24-2010 at 06:19 AM.
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Old 07-24-2010, 01:05 PM
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Default

The tire size is 35x12.50r15.

They are Maxis buckshots.

The programmer goes by 1/4'' sizes on the tire height, so I'd imagine that every little bit will throw off the speedometer.
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Old 07-25-2010, 12:09 AM
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Just put in whatever you measured out as the actual size for the accurate speedo.
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Old 07-25-2010, 05:38 PM
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Well just decided Im buying new tires. After I get these tires I will measure them and program whatever they measure to.
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