03 Sierra rcsb 4.8 5 speed 4wd and this is what i see what i go to change tire size in the wizard.
When i change that value to 30.5 for what size is on my truck, it is about 85 mph higher than what I'm really doing.
Help!
03 Sierra rcsb 4.8 5 speed 4wd and this is what i see what i go to change tire size in the wizard.
When i change that value to 30.5 for what size is on my truck, it is about 85 mph higher than what I'm really doing.
Help!
Last edited by NorthernEdge; 3 Weeks Ago at 11:00 PM.
I can't get the picture to upload.
But it says 12.58 for tire size and if i change that value it makes the speedo go crazy.
are you using the tire wizard or blue car software to change it ?Originally Posted by NorthernEdge
Your best bet is to take how far you are off with the speedo/GPS and apply that to old tire size.
(GPS reading / Speedo reading) x old tire size = new tire size.
Tuner at PCMofnc.com
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The value in the box where the tire info is shows 12.58. If i put in 30.5 then the speedo is wayyyyyyy off like 70 mph off
Can you post the tune? At the bottom right of the dialog box is a button that says "Go advanced", When that loads use the "paperclip" icon to load a file.
"I don't care how it runs as long as it chop chops at idle"
done buddy
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