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Unread 09-25-2009, 09:58 PM   #1
ronsaun
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2003 WJ 
 
Join Date: May 2009
Location: wise river, montana, wise river, montana
Posts: 1,002
do i need to recalibrate for tires?

i am installing 235 85 16's and i know my speedo will be off. i was considering a super chip for both the fuel eco tune and the tire calibration. i have heard some rumblings that my 03 4.7 wj does not need adjusting because of the method the system uses to calculate the speed. if that is the case i dont want to spend $350.00 for the fuel eco program only. pretty expensive for me to get this wrong. help!!!!!!!!!!!

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Unread 09-25-2009, 10:43 PM   #2
xJoshxx
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Location: Burlington, Kentucky
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Quote:
Originally Posted by ronsaun View Post
i am installing 235 85 16's and i know my speedo will be off. i was considering a super chip for both the fuel eco tune and the tire calibration. i have heard some rumblings that my 03 4.7 wj does not need adjusting because of the method the system uses to calculate the speed. if that is the case i dont want to spend $350.00 for the fuel eco program only. pretty expensive for me to get this wrong. help!!!!!!!!!!!
what are your stock tire sizes


Original tire 245/70/16
Sidewall: 6.75 in
Radius: 14.75 in
Diameter: 29.50 in
Circumf: 92.69 in
Revs/mile: 683.57

New Tire 235/85/16
Sidewall: 7.86 in
Radius: 15.86 in
Diameter: 31.73 in
Circumf: 99.68 in
Revs/mile: 635.65

unless you are lifted these will rub like hell.
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The SRt-8's are a liberty design.
2011 WK2 ORA2
2012 WK2 SRT8
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Unread 09-25-2009, 10:48 PM   #3
ronsaun
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2003 WJ 
 
Join Date: May 2009
Location: wise river, montana, wise river, montana
Posts: 1,002
Quote:
Originally Posted by xJoshxx View Post
what are your stock tire sizes


Original tire 245/70/16
Sidewall: 6.75 in
Radius: 14.75 in
Diameter: 29.50 in
Circumf: 92.69 in
Revs/mile: 683.57

New Tire 235/85/16
Sidewall: 7.86 in
Radius: 15.86 in
Diameter: 31.73 in
Circumf: 99.68 in
Revs/mile: 635.65

unless you are lifted these will rub like hell.
i have a 2" lift i hope they dont rub! they are cooper lt atf 10ply 235 85 16
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Unread 09-25-2009, 10:56 PM   #4
xJoshxx
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Location: Burlington, Kentucky
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Quote:
Originally Posted by ronsaun View Post
i have a 2" lift i hope they dont rub! they are cooper lt atf 10ply 235 85 16
thoose are 32" tires... 2inches taller than you are now so you might have a little rub at lock to lock.
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Quote:
Originally Posted by moPowered View Post
The SRt-8's are a liberty design.
2011 WK2 ORA2
2012 WK2 SRT8
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Unread 09-26-2009, 04:43 PM   #5
volvite
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Location: Hill AFB / West Point, Utah
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Don't get the superchip. It wont' recalibrate the speedo. I bought one for that purpose and it didn't work, so I returned it. Not worth it.
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Unread 09-26-2009, 05:06 PM   #6
urq2
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