EFI Tire size tables

[crazycrew]

Can anyone tell me what tables to adjust and what I need to plug in there to adjust my tire size. I fixing to change tires and want to adjust for the right size.

Also, Fuel used quantity and avg. MPG are way off. Fuel used is norally about 4 gallons off and MPG is always waaaaayyy off. At 65 mph it shows about 24mpg avg.

Thanks in Advance

 

[SgtKilroy]

Not sure about the fuel used, but for the tire size go to the manufacturer's website and get the revolutions per mile for your size tire. Then open your ECM tune in the EFI Live tune tool. Under calibrations, go to speedometer, then parameters. In the top left of the speedo window, click on Speedo Calculator. Under the first tab of the window that pops up, go to tire calibrations and enter the revolutions per mile you got for your tire. Then just click apply. If you can find the revolutions per mile, just measure the circumference of the tire in inches and divide that number into 63,360 (number of inches in a mile). Your answer will be your revolutions per mile.
That's how I did it anyhow.

 

[crazycrew]

Thanks James!! Appreciate it!!

 

[SgtKilroy]

No problem brother. Pray for me. I headed out to add Fran to my workout today. :woott:

 

[Chevy1925]

Not sure about the fuel used, but for the tire size go to the manufacturer's website and get the revolutions per mile for your size tire. Then open your ECM tune in the EFI Live tune tool. Under calibrations, go to speedometer, then parameters. In the top left of the speedo window, click on Speedo Calculator. Under the first tab of the window that pops up, go to tire calibrations and enter the revolutions per mile you got for your tire. Then just click apply. If you can find the revolutions per mile, just measure the circumference of the tire in inches and divide that number into 63,360 (number of inches in a mile). Your answer will be your revolutions per mile.
That's how I did it anyhow.

or jsut do the same thing but put in the tire diameter instead of having to find the revs per mile. anything over 35"s will trip the ABS and cause it to not work unless you get a tech 2 and reflash the ABS modual.

 

[crazycrew]

Thanks guys. I'll try this later on today.


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[crazycrew]

Will it need a full flash or a quick flash?


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[Chevy1925]

quick flash is fine

 

[Bonestock]

You can go to http://www.miata.net/garage/tirecalc.html

 

[crazycrew]

Ended up doing the full flash. Thanks guys.


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