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Old 09-16-2011, 01:06 PM   #31
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Re: Speedo Correction for Larger Tires

I don't want any tunes, just want an accurate speedo/odo.

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Old 11-11-2011, 08:46 PM   #32
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Re: Speedo Correction for Larger Tires

Took mine to the dealer. It took 5 minutes to recalibrate the speedo. The shift points are perfect and the speedo is spot on.

It took some manipulation on the numbers because I'm running 410's with 35" tires. No biggy, it cost me a 12 pack.
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Old 02-25-2012, 04:48 PM   #33
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Re: Speedo Correction for Larger Tires

Last week I talked to one of the techs at Sportsmobile about Ford vans. My question was do they re-gear the rear ends if you go from OEM tire sizes to 34" or 35". He said that they are not able to do new vans with tires larger than 32" (maybe a fraction smaller or taller, can't remember). Therefore, they feel they don't need to re gear the rear end because it is close to original. I was surprised and asked why. Apparently the new Fords have some roll over sensors and other new sensors and they are not permitted to go over a certain tire size. (this may have been covered before and I missed it).
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Old 02-27-2012, 01:05 PM   #34
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Re: Speedo Correction for Larger Tires

Quote:
Originally Posted by oclv
Last week I talked to one of the techs at Sportsmobile about Ford vans. My question was do they re-gear the rear ends if you go from OEM tire sizes to 34" or 35". He said that they are not able to do new vans with tires larger than 32" (maybe a fraction smaller or taller, can't remember). Therefore, they feel they don't need to re gear the rear end because it is close to original. I was surprised and asked why. Apparently the new Fords have some roll over sensors and other new sensors and they are not permitted to go over a certain tire size. (this may have been covered before and I missed it).
I would think all bets are off with Ford once the van is converted to 4x4. I may be wrong but I think they're still putting 35" wheels on 17 or 18" rims if clients want them while 33" is the norm.
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Old 02-27-2012, 02:14 PM   #35
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Re: Speedo Correction for Larger Tires

Ford's RSC will limit tire sizes to a max of 33.5" and that's what Sortsmobile has to follow.
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Old 01-27-2014, 02:20 PM   #36
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Re: Speedo Correction for Larger Tires

So the question is.....can the Ford mechanic get into the computer and tell it that I have 285/70-R17s on it now. It's not that I'm concerned about my MPH, that's a 6% change from what I was on, but the miles driven will be off and if there are warranty issues, there may be problems as to when that actually occurred. I've been told that they can only program up to a 265.

Is that true for a 2012?
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Old 01-27-2014, 03:52 PM   #37
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Re: Speedo Correction for Larger Tires

I don't know what the options are for axle ratios and tire size, but running a larger tire will under report the miles driven and 'extend' your warranty.

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Old 01-27-2014, 09:09 PM   #38
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Re: Speedo Correction for Larger Tires

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Originally Posted by Ford_6L_E350
........ but running a larger tire will under report the miles driven and 'extend' your warranty.

Mike
Well, that brings up an interesting philosophical question...as far as the van is concerned, from the axles inboard, it has traveled less miles than actual and those less miles are what's shown on the odo....everything has certainly spun less revolutions than it would have with smaller tires.
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Old 01-28-2014, 10:47 PM   #39
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Re: Speedo Correction for Larger Tires

Here is a reply from Sportsmobile....

That year (2012 Ford E-150) have the digital settings and needs to be done at a Ford dealer through their computers. Do not know how many settings there are, you will have to ask the Ford service guys.

I'm hoping to have that fixed during a future visit.
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Old 01-29-2014, 04:41 AM   #40
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Re: Speedo Correction for Larger Tires

Took Sherman (2013 E350) to the Ford dealer and they maxed out their setting. The OD is still 1-2 mph off, but closer. Tech said he only had so much room in the settings. Quadvan 4x4, tires 285/70 R17
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