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'11-Up Upgrades and Aftermarket Upgrading or adding OEM or aftermarket equipment to your 2011-Up Super Duty.

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Old 11-10-2011, 10:11 PM   #1 (permalink)
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Tire Size Adjuster? I want to add bigger tires..

Hey guys, new here and I just got a new F350 6.7L. I want to add bigger tires but I want my speedo and mpg's to read out correctly... Any ideas on how to do that without adding power? This thing has enough for me!

Thanks.
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Old 11-10-2011, 10:17 PM   #2 (permalink)
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Another thing... I noticed my SRW F350 has a 14k receiver... is that standard on 350 and 250?
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Old 11-11-2011, 12:06 AM   #3 (permalink)
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it all depends on what size you go with. you can get ford to do it if its with in specs. for the trans or get a superchips or like tuner that will change your tire size....
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Old 11-11-2011, 08:04 AM   #4 (permalink)
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you've already got 'tall' gears w/the 3.55
taller tires will rob some of that low-end torque to the road
if you are towing, esp. mountain towing, you will be hobbling the truck
in my opinion, taller tires require shorter gears
but of course that depends on just how tall you want your tires
speedo re-cal is not the important issue IMHO
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Old 11-11-2011, 11:24 AM   #5 (permalink)
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How big of tires are you thinking? Which ones do you have on now? I know from this forum the max heigh you can set the for computer is a 34.7" tire. Not sure if aftermarket companies can over ride that or not.
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Old 11-11-2011, 08:29 PM   #6 (permalink)
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Originally Posted by frank faucheux View Post
you've already got 'tall' gears w/the 3.55
taller tires will rob some of that low-end torque to the road
if you are towing, esp. mountain towing, you will be hobbling the truck
in my opinion, taller tires require shorter gears
but of course that depends on just how tall you want your tires
speedo re-cal is not the important issue IMHO
I've got the lowest possible gears you can get in these trucks... don't forget the tranny gears are low compared to normal. 3.55's on one of these trucks is comparable to 3.73's on chevy and pretty close to a ram with 4.10's.
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Old 11-11-2011, 08:30 PM   #7 (permalink)
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How big of tires are you thinking? Which ones do you have on now? I know from this forum the max heigh you can set the for computer is a 34.7" tire. Not sure if aftermarket companies can over ride that or not.
I want to go with 34.5" how do I set the computeR?
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Old 11-11-2011, 10:45 PM   #8 (permalink)
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Other then buying a programmer you have to have your ford dealer do it for you. Speedometer repair shops might be able to do it for you as well (at least they were able to on my 2002).
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Old 11-12-2011, 03:03 AM   #9 (permalink)
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I have 3:31 gears, put on 34" BFG All Terrains and tow a 15K 5th wheel in the mountains of Southern California and hardly felt a difference. With the torque of this engine and the transmission its not an issue.
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Old 11-23-2011, 04:02 PM   #10 (permalink)
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the drive train ratio 'package' from engine RPM (thru trans and diff) to tire diameter is built to keep engine at optimum power band across probable tow speeds. It does not matter that a differential gear set is not available as an OEM option; its a matter of physics. when building jeeps we always kept the engine in the power band by installing after market diffs or axles and diffs when required
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Old 01-09-2012, 11:54 PM   #11 (permalink)
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2011 Super Duty and larger tires

My 2011 Super Duty has a 10" Ultimate Air Ride air suspension and 37X12.50X20 Nitto Trail Grappler tires on Pro Comp Black Chrome Wheels. I have stock 3.31 gears. I saw 22.1 mpg when stock on flat ground, sea level and 75 - 80 mph. After tires and lift the truck is at a best of 16.2 mpg under same conditions. The truck has ample torque and the tires are not creating a burden on the engine with 800 lb/ft.

After talking with numerous other shops and chip manufacturers we have concluded the following: The new trucks have very sensitive engine controls and sensors. When larger tires are installed, the truck thinks it is going slower than it actually is and "de-fuels" the engine. The result is an unfelt loss of speed when driving. The driver then gives the truck more acceleration, which actually "over-fuels" the engine and creates a fairly dramatic loss of mileage. The dealership can change the size of your new tires in the computer up to a new diameter of 34" or so (I was told). A technician and I fooled with it for awhile one day and were attempting to also fool it by changing the gear ratio in the computer as well, so that the overall tire size was compensated for. We were also doing the 400 hp/800 trq. flash. He ended up giving up after the computer began objecting to both being done at the same time, he thought.

The last I checked (month or so ago) no manufacturer has still been able to "crack" the Ford computer system and change the tire size, gear size and correct the speedo with resulting better fuel mileage. We are on the edge of changing axle gears to solve the problem, but are lazily investigating the correct gear ratio to go to.

We are also waiting to ship out a system to a shop up in Nevada that has a customer with same size tires, 4.30 gears, H&S programmer w. DPF delete and getting around 22mpg. I have not personally spoken to that customer.

On a final note I have had to have to DPF replaced at around 6000 miles. The dealer said they have heard of a few from their rep, who have had to do this. I suspect the larger tires are causing this. I have lately been having the "Drvie to Clean Exhaust" light coming on, which was the symptom before, along with the "wrench" picture. This truck sees a lot of short around town trips and I suspect that may also be contributing or causing the whole problem.
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Old 01-10-2012, 11:16 PM   #12 (permalink)
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Get your self a Hypertech Inline Speedometer Calibrator Module.

I put one on my F-250, fits in behind the dash cluster...........slick as crap. Install the software in your laptop. Make sure you have a data cable and adjust to any size wheel/tire you want.
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Old 01-11-2012, 03:22 AM   #13 (permalink)
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The dealer can set it for any stock wheels available with your 3.55 gears. This was discussed over at FTE but I haven't found the post over there yet. I think it was the largest setting for 20" tires will be almost exact to what you want. I will try to find it and post the tire size here.

For others that have 3.31 gears the problem they run into is if you set a 20" tire size you get a CEL because it is not a stock size available with 3.31 gears. Which was the case with the truck over there. They ended up having the dealership change the gear setting to 3.55 which allowed the 20" setting. Not sure what if anything that does to the truck.
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Old 01-19-2012, 09:39 PM   #14 (permalink)
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Anyone familiar with what the dealer's computer can actually do for a larger tire? Can they manipulate the gear ratio and the tire size (the mild amount that it can?) Nobody makes a controller that can change the settings so the trucks regain their lost mpg's.
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Old 01-20-2012, 08:00 AM   #15 (permalink)
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Anyone familiar with what the dealer's computer can actually do for a larger tire? Can they manipulate the gear ratio and the tire size (the mild amount that it can?) Nobody makes a controller that can change the settings so the trucks regain their lost mpg's.
the ids will do a few different tire and wheel size combo but nothing over about a 34" so no go if lifted. and yes you can change the gear ratio also

you can buy something like a bully dog triple gt. it does power gains but you do not have to use them its adjust up to a 35" i believe. when adjusting tire size it programs the tcm and not the pcm so no warranty problems.
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