Howdy fellas. I had the 3.5 Fabtech put on with 35's, and I whent to reprogram the Edge to compensate for the larger tires...therefore getting my speedo up to par. It said that Tire-Size Selection is Unavailable...Whats the deal? I have a 4.6 V8. Didn't really bother me at first because I used my GPS to get relative speed, but driving to work the other day I was tired...and forgot about the difference (and wondered why everyone was going so darn slow.) THEN I got pulled over, and a $400 ticket was administered as it was a school-zone (service type highway road with a 45 speed-limit for the school) and I was apparently doing 57. Whoops! Any help or advice would be greatly appreciated!
~Phil

 

Did you manually enter the specs for your tire or were you just looking for the tire size on the Edge? There is a calculator in the manual that shows you how to come up with the proper tire size for your Edge. If you haven't already, look at your manual and calculate your tire size. It's real easy. Sorry to hear about your pricey ticket! Maybe you can dispute it since your speedo was out of whack! It's worth a try?

 

What year is your truck? You may have mechanical instead of electronic speedo/odometer. I think '96 and older are mechanical and you will not be able to reprogram to correct your speedo/odometer.

You may also want to try unplugging it for a couple minutes, turn on the ignition but do not start, and plug it back in.

I'm running ~35's on my 03 150 Screw and just installed an Edge Evo last week. I did the calculations for tire size and came out to 2740mm. After adding that in on program 1 the speedo was a lot closer, but still off. I started bumping up the tire size and gave up when I hit 2800mm with no speedo change.

My solution was to drop back down to 2750mm (easy to remember) and play with the gear ratio instead. I found that with 2750mm and 3.88 gears I was within a few tenths of GPS while driving on a level stretch of road. Might have to drop down to 3.86 or 3.87 when I get new tires in another 2 or 3 months...the current ones have a little over 70K on them

 

Correct me if I'm wrong but messing with the gear ratio like that is going to throw your shift points off. . Most of the time it'll end up being off by 3 mph, I wouldn't worry about it.

 

I never really understood how your shift points could be off from either gear or tire changes. Aren't shift points baised on throttle position and engine RPM? I can understand loosing rear wheel HP and Torque by going with a larger tire and regaining stock performance by regearing, but tires and gears don't change the power curve for the engine or at what points the transmisison shifts.

Could someone explain?

 

If you regear 3.73-4.10 than your truck would shift alot sooner(3.73 1-2shift at 40mph and 4.10 1-2shift more like 30mph). If you use the edge to program the gear ratio and you dont actually have those gears it would throw the shift points off because you dont have gears. I have never done this but nothing good can come of it.

 

It was my understanding that the gear and tire changes programmed in with a tuner only affect the speedometer and odemeter. No change to the transmission.

 

Yes your right, gear ratios are entered in only so the speedo can be corrected. Simply telling the ECU a diff gear ratio is in the axle will not cause the shift points to change. According to this theory that the ratio, and not load, effects the shift points the transmission would not compensate for load, it would only shift at the predetermined intervals. Thats simply not the case, the reason for the shifting differently with different gears is the increased or decreased load the motor and trans are facing

 

My truck is a 2001...Where did you change all this? Did you pull it off the lightning software from the computer? All I tried was playing with the tire-size in the truck, and it wouldn't even let me pull up the tire size selection!
~Phil

 

I'm going from memory here:

- Turn on ignition but do not start
- Plugin the Evo
- Clear disclaimer, you will need to do it the first 4 times it turns on
- Menu
- Performance
- Tune 1, no options/custom tuning for the first time you program
- Follow screen prompts
- When complete, start the truck and take a quick spin to make sure everything is OK
- Turn off truck
- Turn on ignition, but do not start
- Menu
- Performance
- Return to stock
- Follow screen prompts
- When complete, start the truck and take a quick spin to make sure everything is OK
- Turn off truck
- Turn on ignition, but do not start
- Menu
- Performance
- Tune 1
- Yes to custom tune
- You can then access gear ratio and tire size. I'm running BFG AT KO's 315 70-17's on stock rims and have my gear ratio set to 3.88 and tire size at 2750. Watch out for some of the options because they can cause damage. Read through the threads on tunes that others use before going into timing, rev limiter, shift points, WOT, etc. You can't change the program on the fly and need to reprogram if you want to make any changes.

You can change what is displayed on the screen without reprograming...just watch out for the instant and average MPG - those two guages hurt your performance more than driving with a broken toe.

 

what do you mean the average mpg and instant mpg hurt your performance? Also what edge did you buy that you need to program 3 times before you can access the tire change settings?Who programs their edge to level 1?

 

He means that if you're watching the MPG, you're not going to be going WOT nearly so often. Every time I do an unofficial 0-60 test on surface streets I look down at the MPG and feel guilty.

The Edge Evolution will not let you customize the built-in tunes the first time you load one. So at a minimum you have to program your truck twice. He was just suggesting you program to one of the built-in tunes (choose 2 or 3 if it makes you happy), then go back to stock to "reset" everything, then choose the tune you want and customize it.

Regarding the speedo, I measured the true circumference of the tire by marking my garage floor, and the speedo is now within 1 MPH of GPS. The speedo is always 1MPH high, and the Edge is always right on, which leads me to believe the speedo has a small mechanical error; I'm sure they all do to some extent.

It's probably obvious, but unless you have GPS or a cop willing to tell you how fast you are going, you can't verify speedo readings. You can't use the Edge by itself to cross-check the speedo: they're always going to be in sync (+/- whatever error the speedo gauge might have), because the Edge is reading the MPH from the computer, just like the speedo is. So for example, on my truck my speedo will always be about 1MPH higher than the Edge, no matter what circumference I put in. So long as the Edge matches GPS, though, I know I've got the right measurement.

 

How do the MPG gauges hurt your performance? Having those gauges staring at you has a tendency to lighten your foot.

Three times? Who said that? I said that you cannot custom tune the first time. You COULD tune 1, 2, or 3 twice in order to custom tune, but then you haven't verified stock is saved properly and can be reloaded. Another thing I have noticed that is not in the documentation is that the slate is not wiped clean unless you return to stock before running another tune.

Level 1 tightens up the tranny and gives you the ability to correct your speedo and odometer. To me it is useful to get a baseline for 0-60 times and fuel consumption. Without running Level 1, it is near impossible to get valid numbers to compute performance increases from Level 2 and 3 or any custom tuning you may do. I don't know about others, but I prefer to have valid numbers instead of relying on perceived changes...guess that's just the computer geek in me. I like to step through processes in order to verify each step, document settings for repeatable results, and collect accurate metrics for comparison purposes.

I know...**** retentive, but it makes me happy.

 

I plugged mine in and went straight to level 3. It was a while before I ever tried level 2, never have tried level 1, since it is just shift characteristics. I now use level 2 a lot around town for more torque at lower speeds and level 3 for highway. However, since the last trip a few weeks ago, I'm still on level 3 since it "feels" so good!

 

This is not related to the number of times that you have loaded the programs. I just found out today that mine has the same problem. New tires today and when I went into the custom options it lets me change everything except the tire size. When I select Tire Size, I get a message that says "This option is not available for this vehicle" and it takes me back to the menu. I sent an email to Edge to find out what is up.