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#1
Mon, February 8th, 2010, 08:01 PM
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Tire size adjustment..
Got my 87 Custom Perf loaded up and I went into custom options to fix my tire size and though I got it close...didn't get it quite right. I am showing about 2 mph higher then what my GPS says...so I over shot it a little bit. My question is...#1- would you worry about being off that little bit? #2- if I want to adjust it, can I go back into my custom options without going through the whole loading process again?
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#2
Mon, February 8th, 2010, 08:12 PM
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This will answer your question re: Custom Options.
http://forum.gopowerhungry.com/faqs-....html#post9248 As far as speed being 2 mph off, it's really up to you. There are numerous posts and very good methods for determining the corrected tire size.
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"Good judgement comes from experience. Experience comes from bad judgement." - Colin Powell to new batch of 2LTs (while serving as V Corps Commander)  Factory manuals here: http://www.motorcraftservice.com |
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#3
Mon, February 8th, 2010, 08:28 PM
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Thanks a lot for that link..lots of useful info there. Seems like I am fine with being 2 off on my dash. Gryphon and GPS are "almost" dead on. I'll just leave it. Thanks again. And just fyi to all interested, 2718 is what worked for my 35x12.5x18's
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#4
Tue, February 9th, 2010, 12:34 PM
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That figure is just a teeny bit larger than what you'd get with a 3% "squish" compensation. Looks like a perfectly reasonable number to me.
- Jack
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 2024 F150 Platinum SCrew 3.5L PowerBoost FX4, Peragon Tonneau Cover, LineX Bed, 35% Window Tint on All Sides and Rear, Full Nose Paint Protection Film, Husky Mud Guards, Lasfit Floor Liners, VIOFO Dash Cam |
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#5
Tue, February 9th, 2010, 04:30 PM
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If you want to get it perfect clear the odometer on the truck and GPS, drive at least 10 miles then use this calculation:
Truck distance / GPS distance x tire size = new tire size  Also apparently Ford made the speedometer about 2 mph off. My GPS, truck and gryphon all say the same thing.
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