sct

[strokethis04]

Hey guys I changed my tire size now do I have to get a new tune or can I change my rpm on the programer?

[fdchief]

there is a calculator somewhere on here you can change your tire rpms on the tuner and u will be fine

[Abrannan19]

go here:

tools and toys (not just for linux): car wheel calculator

this will give you revs per mile.

return the truck back to stock, reload the tune in the truck and when it ask if you want to set optional parameters, select yes, and enter the gear ration then scroll to find tire size or diameter, that when you will enter the Revs per mile, you will not find an exact match, as they are in increments of 5, so I would suggest selecting the higher amount closest to actual, not the lower amount.

[3LDUDE]

Not to but in but lets say I don't have a programer. Can I use the numbers from that website to figure out my actual milage on my truck? I can actualy see if my mpg changed

[Abrannan19]

Originally Posted by 3LDUDE

Not to but in but lets say I don't have a programer. Can I use the numbers from that website to figure out my actual milage on my truck? I can actualy see if my mpg changed

Shelby, your best bet for figuring mileage is to get on the interstate, start a any mile marker and drive 5 miles and see what your ODO shows vs. what you have actually driven as per the mile markers.

[strokethis04]

thanks guys i changed it on the programmer now another question i got is should i get new tunes if i do an egr delete? i'm running djs looney tune i belive the egr is turned off on it thanks in advance