Do you need a programmer to change tire sizes??? - FordTough.ca - Home of Canadian Ford Truck Enthusiasts
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 15 (permalink) Old 09-06-2014, 07:40 PM Thread Starter
 
f150phule's Avatar
 
Join Date: Mar 2007
Location: London, ON
Posts: 2,299
Do you need a programmer to change tire sizes???

Not sure of the answer to this for new cars. I know on older stuff like my new truck you can use a programmer to change the tire size in the computer but is that still the cae with today's new cars.

Reason I ask is that we are getting a 2014 Taurus in the family and it comes with 20's. I was wondering if I got 18's for the winter if I would have to reprogram the car for the 18s of if today's cars are smart enough to detect the change and compensate for the difference without me having to do anything.


Whaddya mean I dont pay my bills?? Whydya think I'm broke!!

03 Lariat Crew 4x4 Line-x bedliner, Truxedo Lo-Pro QT Tonneau.
RIP [97 XL 4.2L V6]
f150phule is offline  
Sponsored Links
Advertisement
 
post #2 of 15 (permalink) Old 09-06-2014, 08:40 PM
 
SVT4MT's Avatar
 
Join Date: Aug 2010
Location: Port Elgin, Ontario
Posts: 4,741
Garage
The wheel size (18" or 20") doesn't matter so much as the circumference or rolling diameter of the tire.

You need to change the height of the sidewall to make sure the rolling diameter is the same, otherwise the computer will not be happy.

When I had my FX4's, I was running 18's, but there was a better selection of snow tires in the 17" category that were actually cheaper.

The XL models come with 17's, same brakes, so they fit fine on the FX4, and I just went with a tire size that gave the same rolling diameter.

You can actually find on-line calculators that will do the number crunching for you and tell you how close the two sizes are, how far off your speedo will read, and what size tires to use to work with the Taurus.

Incidentally, check the lower end of the Taurus models, I ordered plain jane , black steel wheels off the XL from the dealership, and they were pretty reasonably priced.

801A - 6550 lb bundle of joy
SVT4MT is offline  
post #3 of 15 (permalink) Old 09-06-2014, 08:42 PM
 
Viper238's Avatar
 
Join Date: Aug 2007
Location: Woodstock, Ont
Posts: 3,353
Send a message via MSN to Viper238
As long as the rims fit, and the overall diameter is the same
(offsetting the original rim size with rubber) both 28" diameter, it won't matter.

no need to get the computer re-programmed. also the diff/trans ratios won't be out, so the RPM's will maintain the same at the same speeds whether on 20's or 18s.

Also make sure you get tire pressure monitor sensors installed, and will likely need either the reflash tool or have ford re-program the vehicle seasonally when you swap them.

edit:
Mike beat me to it. lol

I use this calculator to determine the sizes.
http://www.tacomaworld.com/forum/tirecalc.php
Viper238 is offline  
 
post #4 of 15 (permalink) Old 09-06-2014, 08:47 PM
 
SVT4MT's Avatar
 
Join Date: Aug 2010
Location: Port Elgin, Ontario
Posts: 4,741
Garage
Yah, but I forgot about the TPMS sensors Travis, thanks for filling in the gaps with the link , that's exactly what I was talking about.

Sensors were pretty reasonable from the dealer as well, just have to make sure they re-introduce whatever set your putting on to the computer each time you swap them out.

801A - 6550 lb bundle of joy
SVT4MT is offline  
post #5 of 15 (permalink) Old 09-07-2014, 07:10 AM
 
SVT4MT's Avatar
 
Join Date: Aug 2010
Location: Port Elgin, Ontario
Posts: 4,741
Garage
SE - P235/60R17

SEL - 235/55R18 or 245/45R20 (depends on the package)

SHO - 255/45R19 or 245/45R20 (depends on the package)

Compare the 17's to the 20's with the link Travis posted and it shows they're pretty close, with no adjustments to the computer required.





801A - 6550 lb bundle of joy
SVT4MT is offline  
post #6 of 15 (permalink) Old 09-07-2014, 11:21 AM Thread Starter
 
f150phule's Avatar
 
Join Date: Mar 2007
Location: London, ON
Posts: 2,299
Cool guys thanks for the link. We may skip the TPMS though just for $ sake. The winter tires we have on Kim's Grand Prix never had the TPMS, the only bad thing about that was you had to clear the message off the screen every time you started the car but that only took a second.


Whaddya mean I dont pay my bills?? Whydya think I'm broke!!

03 Lariat Crew 4x4 Line-x bedliner, Truxedo Lo-Pro QT Tonneau.
RIP [97 XL 4.2L V6]
f150phule is offline  
post #7 of 15 (permalink) Old 09-07-2014, 05:33 PM
 
Boss F150's Avatar
 
Join Date: Aug 2012
Location: Embro, ON
Posts: 273
I found that the computer must be able to hold at least 8 sensors as I don't have to reprogram each season. They work just fine all year.

2012 STX 5.0L Sturgis/Boss 302
Boss F150 is offline  
post #8 of 15 (permalink) Old 09-08-2014, 07:20 AM
 
Viper238's Avatar
 
Join Date: Aug 2007
Location: Woodstock, Ont
Posts: 3,353
Send a message via MSN to Viper238
So I wondered the same. Ford couldn't confirm this. I swapped tires on my '09 truck once and they worked fine.


Sent from my iPhone using Tapatalk
Viper238 is offline  
post #9 of 15 (permalink) Old 09-08-2014, 04:15 PM Thread Starter
 
f150phule's Avatar
 
Join Date: Mar 2007
Location: London, ON
Posts: 2,299
Ok so after using Travis' handy dandy tire calculator we have a winner.

235/65r17 Nokian Nordman winter tires. Same tires I have for the truck just a different size.

Now I need to check with my wheel guys for a set of steel rims, $40-60 each range is what I'm looking for.


Whaddya mean I dont pay my bills?? Whydya think I'm broke!!

03 Lariat Crew 4x4 Line-x bedliner, Truxedo Lo-Pro QT Tonneau.
RIP [97 XL 4.2L V6]
f150phule is offline  
post #10 of 15 (permalink) Old 09-08-2014, 11:47 PM
 
Viper238's Avatar
 
Join Date: Aug 2007
Location: Woodstock, Ont
Posts: 3,353
Send a message via MSN to Viper238
You sure a 65?


Sent from my iPhone using Tapatalk
Viper238 is offline  
Reply

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Rims sizes? xllxll_VIPER_llxllx F-150 1997 to 2003 /04 Heritage Forum 4 01-13-2012 09:34 PM
Tire change Which one? will99 Super Duty Forum 9 06-25-2011 06:57 PM
Canadian Nitto Tire dealer besides Kal Tire? joeyg Wheels and Tires 5 10-05-2010 06:34 PM
NEED HELP: 2008 SD Lariat: Bushwacker flares, tire sizes..... Clem Super Duty Forum 7 07-21-2009 06:46 PM
Winter tire pack.from Tire rack. Black Ice Wheels and Tires 11 11-29-2008 10:02 AM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome