speedo calibration / Edge

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Nov 19, 2007 | 08:26 PM

bowkill

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Joined: Jan 2007

Posts: 46

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speedo calibration / Edge

I have an Edge programmer and have the tire size set. My speedometer on teh dash reads 65 mph, the Edge will read 62 mph, and my GPS will read 60 mph. I can do the math and figure out my real speed, but the math get a little harder figuring our actual miles drivin and MPG. Is the Edge right? It drives me nuts that they dont all say the same thing. Should I adjust the tire size so that either the speedometer and/or the edge read the same as the GPS. Has anyone else noticed this.

Nov 19, 2007 | 09:00 PM

mattd17

Fleet Mechanic

Joined: Dec 2004

Posts: 1,365

Likes: 6

From: Ketchikan, AK.

yes, i noticed the same thing.... be sure to check the gear ratio setting on your edge as well.... according to my axle code of 19, i have the 3.55 ratio, which makes my edge read wrong.... but, when i enter 3.73 into my edge, it will match the GPS unit. however, you cannot believe the truck speed needle, that will always read wrong as long as you have larger tires on it, unless you actually have the pcm calibrated for it. a dealership could do it, but then you wouldnt be able to use the edge, since you would have to leave it on the stock setting for the needle to be correct. the nice thing is that the needle should read high. this being said, if you follow the speed limit, you will always be a couple slow, which is safer against the tickets.

Nov 19, 2007 | 09:22 PM

KevinAH

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Joined: Aug 2007

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Yeah, mine is 2 to 3 different on my edge as well. What's interesting to me is that I have never adjusted my ratio settings since I haven't changed my gears. The manual said to not adjust it unless you change the gears. After reading Mattd17's post, I went out and looked at what the default setting is, it read 3.73---I got the 3.fitty 5. What does this affect? Is it just speed and shift points? I've had the edge for about a year now and I'm just noticing this.

Nov 20, 2007 | 04:19 PM

bowkill

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I will have to check my axle settings. Thanks

Nov 20, 2007 | 05:22 PM

derek4343

Senior User

Joined: Jun 2005

Posts: 332

Likes: 2

Quote:

Originally Posted by bowkill

i spoke to edge a year ago and they claim that their edge is correct because it reads right off the computer. he said all the fords read 1-2 mph fast.

Nov 21, 2007 | 09:04 AM

Red04F150

Junior User

Joined: Oct 2005

Posts: 50

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From: Prairieville, LA

I checked my speed with one of those police radars that sit on the side of the interstate. According to it my speed was between the edge speed and what my speedo showed. My edge reads about 2 mph less than my speedo.

Nov 21, 2007 | 09:21 AM

Pingjockey

New User

Joined: Nov 2007

Posts: 1

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Quote:

Originally Posted by Red04F150

I just got my 07 SCREW and i notice that unlike my other two vehicles when i am trying to stay even on the hwy at ten over like everyone else I am at 11 over on the F150. My other two vehicles ('05 Jag and a '06 Mazda 3) are dead nuts accurate.

I havent passed a speedcheck but they are off alot of the time in the past when i have ran past them.

Can anyone post what improvements they have seen from the Cold Air Intake, new exhaust and a programmer?

I am specifically interested in fuel economy increases but wanna hear about all the gains. I would also love to hear it from a driver instead of a selling point from the dealers. I was wondering if I should get the air in and exhaust out before gettin the programmer.