Quote:
Originally Posted by agood1
Hey Guys,
I had to buy a new set of tires so I have to reset my TS in the Gryphon. I went back to the stock tire size of 275/65/18.
Right now with the Gryphon set at 2560, My GPS is showing 2-3 MPH slower than the Speedo. The Gryphon is showing in between the GPS and the Speedo.
Should I increase the MM size and how much?
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Actually, I'd say you are almost dead on if you see no more than about 1-1.5 mph difference between your GPS and the Gryphon. But, to get them to agree, you need to
decrease your TS, not increase it. Assuming the difference you see is at 70 mph, you have a 1.4-2% error. Try reducing your TS to 2524mm.
And remember, the dash speedo is always going to read a bit faster than you're traveling, because Ford builds them that way.
- Jack