Reprogramming for Larger Tires
Thread Starter
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Mountain Pass
Joined: Jan 2007
Posts: 104
Likes: 15
Reprogramming for Larger Tires
Has anyone had a problem reprogramming the PCM to recognize larger tires? I just got off the phone with the dealer where I bought my truck and they told me the PCM won't recognize the larger tires because it wasn't an option for the truck?!?!? They are Raptor tires (315/70/17) so they are a stock Ford piece.
Crazy part is...they did a truck with suspension, exhaust, tires,
and the service manager said they were able to do theirs!!!
The tires and wheels are aftermarket pieces but not sure of the size. WTF?!?!?
I know it isn't a big deal, but I want the speedometer to be reading correct instead of always doing the math to figure out mileage and road speed.
I may just try another dealer and see how I make out. Any help would be great.
Crazy part is...they did a truck with suspension, exhaust, tires,
and the service manager said they were able to do theirs!!! The tires and wheels are aftermarket pieces but not sure of the size. WTF?!?!?I know it isn't a big deal, but I want the speedometer to be reading correct instead of always doing the math to figure out mileage and road speed.
I may just try another dealer and see how I make out. Any help would be great.
Logistics Pro
Joined: Oct 2004
Posts: 4,738
Likes: 103
From: FL
They should be able to flash the PCM with 607, see post here:
https://www.ford-trucks.com/forums/1...l#post13601518
https://www.ford-trucks.com/forums/1...l#post13601518
Thread Starter
|
Mountain Pass
Joined: Jan 2007
Posts: 104
Likes: 15
They should be able to flash the PCM with 607, see post here:
https://www.ford-trucks.com/forums/1...l#post13601518
https://www.ford-trucks.com/forums/1...l#post13601518
I'm calling BS!!!
Super Moderator
Joined: Jan 2008
Posts: 40,006
Likes: 1,517
From: Maine, Virginia
I'm calling BS too because my local dealer sends about 6 trucks per year out to be upfitted with huge tires, lifts, etc.
Postmaster
Joined: Feb 2014
Posts: 4,735
Likes: 1
From: Hattiesburg, Ms.
Has anyone had a problem reprogramming the PCM to recognize larger tires? I just got off the phone with the dealer where I bought my truck and they told me the PCM won't recognize the larger tires because it wasn't an option for the truck?!?!? They are Raptor tires (315/70/17) so they are a stock Ford piece.
Crazy part is...they did a truck with suspension, exhaust, tires, and the service manager said they were able to do theirs!!! The tires and wheels are aftermarket pieces but not sure of the size. WTF?!?!?
I know it isn't a big deal, but I want the speedometer to be reading correct instead of always doing the math to figure out mileage and road speed.
I may just try another dealer and see how I make out. Any help would be great.
Crazy part is...they did a truck with suspension, exhaust, tires,
and the service manager said they were able to do theirs!!! The tires and wheels are aftermarket pieces but not sure of the size. WTF?!?!?I know it isn't a big deal, but I want the speedometer to be reading correct instead of always doing the math to figure out mileage and road speed.
I may just try another dealer and see how I make out. Any help would be great.
As everyone else has stated, dealers are always selling trucks with lifts and tire mods, especially down here, they even advertise that the speedo has been reprogrammed for the tire / wheel combo.
Elder User
Joined: Apr 2010
Posts: 754
Likes: 0
This keeps coming up. Unless something has changed recently the only options the dealer has selectable are the tire sizes that were available on your truck from the factory. That is your VIN. Not all the sizes that are available on the entire F-150 line including the Raptor. They don't just type in a size, there are listed sizes to select. So, since you couldn't order Raptor tires when you ordered your truck, that size will not be listed.
Not sure how these dealerships that are modding new trucks and selling them are doing it.
Not sure how these dealerships that are modding new trucks and selling them are doing it.
Postmaster
Joined: Feb 2014
Posts: 4,735
Likes: 1
From: Hattiesburg, Ms.
Aftermarket Programmer? Not sure, never had a reason to ask. Most guys that I know that have modded their trucks used a programmer. I just know that the salesmen down here are quick to tell you the speedo has been recalibrated when they are trying to sell a (new) truck with larger the OE tires. I have never drove one and compared it to a GPS either, so they may not have them recalibrated.....
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Elder User
Joined: Apr 2010
Posts: 754
Likes: 0
Aftermarket Programmer? Not sure, never had a reason to ask. Most guys that I know that have modded their trucks used a programmer. I just know that the salesmen down here are quick to tell you the speedo has been recalibrated when they are trying to sell a (new) truck with larger the OE tires. I have never drove one and compared it to a GPS either, so they may not have them recalibrated.....
Either way, they are not using the stock Ford programming to correct for large oversized tires.
This has been a known issue since at least 2011.
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Postmaster
Joined: Feb 2014
Posts: 4,735
Likes: 1
From: Hattiesburg, Ms.
That's what I was thinking. I have heard too many people take their trucks in and $100 later the dealership says there are done an didn't appear to change anything.
Either way, they are not using the stock Ford programming to correct for large oversized tires.
This has been a known issue since at least 2011.
Either way, they are not using the stock Ford programming to correct for large oversized tires.
This has been a known issue since at least 2011.
(then purchase a programmer and fix it)!
Super Moderator
Joined: Jan 2008
Posts: 40,006
Likes: 1,517
From: Maine, Virginia
My local dealer sends the trucks out to be upfitted and the company that mods them owns and supports parts of the new truck warranty. If I were the company being hired to mod several trucks per year for all the local dealers, I'd definitely own the programmer that adjusted the speedo.
Thread Starter
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Mountain Pass
Joined: Jan 2007
Posts: 104
Likes: 15
This keeps coming up. Unless something has changed recently the only options the dealer has selectable are the tire sizes that were available on your truck from the factory. That is your VIN. Not all the sizes that are available on the entire F-150 line including the Raptor. They don't just type in a size, there are listed sizes to select. So, since you couldn't order Raptor tires when you ordered your truck, that size will not be listed.
Not sure how these dealerships that are modding new trucks and selling them are doing it.
Not sure how these dealerships that are modding new trucks and selling them are doing it.
Elder User
Joined: Apr 2010
Posts: 754
Likes: 0
OK...with that being said, could they reprogram for a different rear end gear?? The Raptor tires are 7% off by calculations. My truck has a 3.55:1 rear gear, so, 7% higher gear would be approximately a 3.31:1 gear ratio. That would get me a lot closer, maybe not perfect, but closer to accurate.
Remember you can select any tire size that you could have ordered. If you have 18" wheels you can still select a 20" wheel if it gets you to the correct diameter.
Otherwise I would go with a programmer.
Elder User
Joined: Apr 2010
Posts: 754
Likes: 0
Looking at the tire options I think you will need to go with a programmer. Your tires are 34.36" diameter, the largest diameter you can put in is 32.07" with 275/65/18. The 20" are actually a smaller overall diameter.
Unless there is a way to select the Raptor sizes I think a programmer is the way to go.
Unless there is a way to select the Raptor sizes I think a programmer is the way to go.
Super Moderator
Joined: Jan 2008
Posts: 40,006
Likes: 1,517
From: Maine, Virginia
Not helpful to the OP but, for anyone who is reading this and only planning to go up one size from the existing factory size, a reflash shouldn't be needed.
I called my dealer today and talked with my service adviser. I explained t hat I'm planning to move up tot he P265's from the P235's and said t hat a reflash is not needed.
I called my dealer today and talked with my service adviser. I explained t hat I'm planning to move up tot he P265's from the P235's and said t hat a reflash is not needed.