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pirates55
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Post subject: Tire Size Question  Posted: Sat Nov 05, 2011 8:05 am |
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Joined: Sat Oct 29, 2011 9:11 pm
Posts: 9
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My truck came stock with 20" wheels. When I program my vehicle should I pick stock tires or should I pick bigger tires. If I measure from the ground to the top of the tire its about 33". However, these are stock tires and BG Goodrich Rugged Trail Radials. They are the same as the stock tires that came on the truck.
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RON @ SUPERCHIPS
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Post subject: Re: Tire Size Question Posted: Mon Nov 07, 2011 10:47 am |
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Joined: Tue Jul 25, 2006 9:41 am
Posts: 18258
Location: SUPERCHIPS
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I would measure them physcially and then use this input.
Ron
_________________ RRAPP@SUPERCHIPS.COM 1-888-227-2447 8-5 EST. Email me directly if your having ANY trouble with the forum. Not able to LOGIN, email me with your Username that you registered with.
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pirates55
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Post subject: Re: Tire Size Question Posted: Tue Nov 08, 2011 1:18 pm |
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Joined: Sat Oct 29, 2011 9:11 pm
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So measure from the ground to the top of the tire and enter the info into the tuner? I assume you put the numerical (33 inches) into the tuner and it calibrates it that way? I haven't played with the tire size info much not wanting it to try and change my speedometer or anything.
Does it mess the speedometer if you change the tire size? Again mine came factory with 20" wheels making from total height from the ground to the top of the tires 33 inches.
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RON @ SUPERCHIPS
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Post subject: Re: Tire Size Question Posted: Tue Nov 08, 2011 4:00 pm |
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Joined: Tue Jul 25, 2006 9:41 am
Posts: 18258
Location: SUPERCHIPS
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If your speedometer is correct, then I would not adjust for the tires.
That is the end result after changing for the tires, speedo/ odometer recalibrated and shift points and pattens closer to the stock points.
Ron
_________________ RRAPP@SUPERCHIPS.COM 1-888-227-2447 8-5 EST. Email me directly if your having ANY trouble with the forum. Not able to LOGIN, email me with your Username that you registered with.
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pirates55
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Post subject: Re: Tire Size Question Posted: Wed Nov 09, 2011 10:38 am |
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Joined: Sat Oct 29, 2011 9:11 pm
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My speedo is correct as they are factory wheels and tires. I changed the setting last night and plan to test out the speedo comparded to my GPS to see if it changed anything.
So are you saying that the tire size adjustment in the tuner is simply to correct the speedo if its off??? It doesn't change the actual tuning of the engine, etc.
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RON @ SUPERCHIPS
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Post subject: Re: Tire Size Question Posted: Wed Nov 09, 2011 1:27 pm |
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Joined: Tue Jul 25, 2006 9:41 am
Posts: 18258
Location: SUPERCHIPS
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Correct.
Ron
_________________ RRAPP@SUPERCHIPS.COM 1-888-227-2447 8-5 EST. Email me directly if your having ANY trouble with the forum. Not able to LOGIN, email me with your Username that you registered with.
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pirates55
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Post subject: Re: Tire Size Question Posted: Thu Nov 10, 2011 11:19 am |
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Joined: Sat Oct 29, 2011 9:11 pm
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I adjusted the tuner to the correct tire height and checked the speedo to my GPS this morning and its didn't change anything. I assume that since the tires are factory even though they are 33" high ford calibrated the speedo from the factory to adjust for it.
By changing tire height in the tuner it doesn't change transmission shift points or anything does it.
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RON @ SUPERCHIPS
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Post subject: Re: Tire Size Question Posted: Thu Nov 10, 2011 12:11 pm |
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Joined: Tue Jul 25, 2006 9:41 am
Posts: 18258
Location: SUPERCHIPS
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In a round about way it will.
On a vehicle with a speedo that is not correct, the shift pattern will be offsetted.
Correcting the speedo, will correct shift points, and odometer.
Ron
_________________ RRAPP@SUPERCHIPS.COM 1-888-227-2447 8-5 EST. Email me directly if your having ANY trouble with the forum. Not able to LOGIN, email me with your Username that you registered with.
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