changing tires size & how to correct?????

1754 Views 12 Replies 6 Participants Last post by WhonosWho, Jul 8, 2005

jaysvt

Discussion Starter · Jul 2, 2005

i am lifting my truck 8" and putting 38" tires on it. How can i correct the speedo. Ithink it will be off alot. and don't want a ticket for speeding. Any sugestions???????

jay

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I have not heard of any tuner on market for the 6.0 diesel that can adjust speedo for tire size or gear ratio.....they will do it on gasers but not for the 6.0........tell me if I am wrong I will buy it because I would love to be able to do that with mine.

Tim

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For 38" tires you're going to need a True Speed to correct your speedo.

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If he wants to.......and some of the tuners can do it too.

RL

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WhonosWho

· #7 · Jul 5, 2005

Talked to them today and they cannot calibrate the speedometer but they can change shift points. They recommended getting a superlift truespeed to calibrate speedo.....Tim

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Innovative and ATS can build you a custom tune that will calibrate speedometer and shift points. I went with Innovative, but I have heard good things about both.

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WhonosWho

· #10 · Jul 7, 2005

Please tell us which tuner will calibrate for speed since I talked to ATS and innovative SCT and they cannot change speedo which is what I already said and I have used superchip and predador and bully dog which is my current tuner and none of them can change speedometer so please tell me which one will?????

Tim

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If you don't want to use a tuner, Ford can calibrate for up to 35" tires. This will atleast get you close.

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WhonosWho

· #13 · Jul 8, 2005

It adjusts for shifting but speedo will still be off on the diesels....Tim

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Ok, I dug around, look here:

http://www.sctflash.com/xc2.php

Scroll down, center column. You can play with axle ratio (2.73 to 5.14) and tire size (205/65/15 to 315/35/19). Me thinks the SCT CAN do tires......maybe whoever you spoke with at Innovative was misinformed (or SCT's website is misleading).....

So, can anyone confirm whether the new SCT can do tire sizes???

RL

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