Programing for tire size
Cargo Master
Joined: Mar 2003
Posts: 2,333
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Thanks for the info. This creates a particular problem for me now as I have three different tire sizes I plan to run. Four if you count the drag slicks.
With the PSOM being in the speedo that means I would have to change out my speedo when I change tires. Unless those aftermarket speedo correctors work without changing the PSOM's 6 changes. Anyone know how these work?
With the PSOM being in the speedo that means I would have to change out my speedo when I change tires. Unless those aftermarket speedo correctors work without changing the PSOM's 6 changes. Anyone know how these work?
Just adjust speed to allow for faulty reading.
Speedo and shift points for tranny will be off a little. No biggie.
I would pick a middle of the road number and call it good.
You could swap out new psom/speedo with each set of tires if you don't mind the extra work and expense.
The psom is actually the electronic print board behind the speedo.
I think the speedo correctors you are refering to work with the mechanical speedos only.
New User
Joined: Jan 2017
Posts: 7
Likes: 0
So I put 8-19.5 on a 1993 F Superduty an I'm having a head time figuring out what constant I should use so my speedo is correct the tires are cooper courser traction lt's they are 34-1/2 tall with the truck setting on them , the reason for putting these tires on is because the trucks got 5:13 gears from factory any help would be appreciated thanks
Danr1,
Glad it worked for you.
Just as a friendly note though, I'm not sure that using another vehicle as a base figure is all that accurate. You should go off of mileposts or speedometer check stations on the highway for the best accuracy.
Also, if you are referring to this article, you are using incorrect numbers in your above formula.
This is how your above formula SHOULD read:
32x3.14=100.48/12=8.37 5280/8.37=631x.0135=8.52
Once again, I'm only trying to be accurate, not argumentative.
Glad it worked for you.
Just as a friendly note though, I'm not sure that using another vehicle as a base figure is all that accurate. You should go off of mileposts or speedometer check stations on the highway for the best accuracy.
Also, if you are referring to this article, you are using incorrect numbers in your above formula.
This is how your above formula SHOULD read:
32x3.14=100.48/12=8.37 5280/8.37=631x.0135=8.52
Once again, I'm only trying to be accurate, not argumentative.
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winginit
1973 - 1979 F-100 & Larger F-Series Trucks
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Aug 29, 2016 08:12 AM
