Does the computer learn ?
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Joined: Jun 2010
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From: Canyon Country, Ca
Does the computer learn ?
Hello all,
I was told this and was wondering if it is true. I was going to but some bigger size tires. I have 265/70 r17, (stock).
I was going to buy 285/70 r 17 or 285/75 r 17.
I was told that when you install a bigger tire on these newer SD's that the computer will learn the tire size after a certin milage amount, and then adjust the speedo calibration.
Is this true. Or do I still need to go to the dealer and have them adjust via the computer.....
Thanks
I was told this and was wondering if it is true. I was going to but some bigger size tires. I have 265/70 r17, (stock).
I was going to buy 285/70 r 17 or 285/75 r 17.
I was told that when you install a bigger tire on these newer SD's that the computer will learn the tire size after a certin milage amount, and then adjust the speedo calibration.
Is this true. Or do I still need to go to the dealer and have them adjust via the computer.....
Thanks
Last edited by V10ZILLA; Dec 21, 2010 at 06:54 PM. Reason: spelling
Postmaster
Joined: Oct 2008
Posts: 3,924
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From: Richmond BC
no it wont, you with have to have the PCM adjusted for the tire size.
i had it done on my 03 at Ford when i went up to 35" tires.. doesnt affect the speedo thou, it just affects shift strategys in the trans.
i had it done on my 03 at Ford when i went up to 35" tires.. doesnt affect the speedo thou, it just affects shift strategys in the trans.
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Senior User
Joined: Jun 2010
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From: Canyon Country, Ca
All good info to know. Thank you all. So I will have to go to the dealer have them adjust it. The adjustment will not correct the speedo but will adjust the tran shifts.
Thanks
Thanks
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Senior User
Joined: Jun 2010
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From: Canyon Country, Ca
Ok I will go to the dealer and have it done regardless. Wondering if there is only certain tires sizes that their computer will allow them to adjust for. Meaning 285/75r17 is really not a size offered by most tire companies. 285/70r17 is offered by most of them. So I am thinking that the dealer only has a few choices to adjust to for safety and liability stuff.
Last edited by V10ZILLA; Dec 21, 2010 at 11:31 PM. Reason: grammary
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From: SE Wyoming
Ok I will go to the dealer and have it done regardless. Wondering if there is only certain tires sizes that their computer will allow them to adjust for. Meaning 285/75r17 is really not a size offered by most tire companies. 285/70r17 is offered by most of them. So I am thinking that the dealer only has a few choices to adjust to for safety and liability stuff.
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Senior User
Joined: Jun 2010
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From: Canyon Country, Ca
That is exactly what I discovered with our '05 the dealer had certain choices and the tires we had put on were not one of them so it was a waste of the $100, which they of course charged even though they did nothing. That is why I think it is better to put that money towards a programmer.
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From: TX
The service writer at first told me they could only adjust for 17-in. wheels since the truck originally was equipped with 17-in wheels; why, I don't know. So I used this tire website to determine an approximate 17-in wheel tire size. For the stock tire, I used the current tire on the truck; new tire was the equivalent 17-in wheel tire size. Gave them the equivalent tire size but nevertheless, they were able to calibrate it to gnats-a$$ speed when compared to the GPS. The website also gives the revolutions-per-mile info if the dealership needs that info as well.
Hope this helps,
Hope this helps,
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