Speed Calibration and Gryphon

[JWBFX4]

Originally Posted by Desert Racer

Well I have been looking for a few threads both on here and on F150online.com for my tire size to lock in and have no luck. When I go to calibrate the gryphon to my tire size it will not hold it. I load previous settings and no luck it is stuck at 23XX and I need 2470 for my 35's. How to I make it lock and save in there? Thanks!

Well I would say that 2470 seems low for 35" tires....So off the tire size you posted later (315/70/17) I did the math and got 2741.9 unloading circumference(I think thats right). So I guess take off 7% squish from that number and you should be closer to correct(im not sure what it is can't do the math in my head). Then just follow the instructions that Jack has said for entering it into the custom options.

[Desert Racer]

Opps yeah got the numbers backward when typing. Took 7% off an got 2741.83. So still 2741, now just to mkae the gryphon stick to this and i will be happy.

[88Racing]

Almost sounds like the gryphon doesn't want to take the new inputted values?

Have you updated it with pegasus? To make sure the firm ware is up to date?

Maybe a glich?

Maybe a job for Super Bill!

Lars

[JWBFX4]

Well then I was no help Like Lars said it might just be a job for Bill now.

[Desert Racer]

Whatever I do to the gryphon it does not hold whatever i put into it. Tried lowering the speed limiter and well that did not work. So this update thing? how do I go about this that you speak of Lars? Thanks guys for all the help so far.

[Jackpine]

Originally Posted by Desert Racer

Whatever I do to the gryphon it does not hold whatever i put into it. Tried lowering the speed limiter and well that did not work. So this update thing? how do I go about this that you speak of Lars? Thanks guys for all the help so far.

I'm not Lars, but, I'll try to do as well as he would have.

First, make sure you are running the latest version of Pegasus. Mine is V2.01.0127 and it's up to date. If yours is any earlier, it's definitely out of date. If out of date, use the Pegasus Update Manager to get the latest version. DO NOT try to update a Gryphon with an old version of Pegasus!

Next, set your tune back to Level 0 on your truck and remove the Gryphon. Bring it to your PC and start Pegasus, then, plug the Gryphon in to a USB port.

The Gryphon screen should light up (I think mine becomes red?) and you should see your unit's Serial Number (S/N) on the status line in Pegasus. Click on Updates->Gryphon Update Manager.

If there is a firmware update, go ahead and install it. DO NOT install a calibration update. That will wipe out your custom tunes.

Now, once everything is finished, go back to your truck, turn the key ON and plug the Gryphon back in. You should be able to reprogram your truck to the desired level now.

I calculated an unloaded circumference of 2741 for your tires - what you calculated. Using 7% rubber squish (which is close to 3% total squish), I get 2644 as the figure you should enter. This is MUCH larger than the value you were using. Try it. Remember to hit <Enter> to save the new value and then scroll to <Done> to start the programming.

If this still doesn't work, something IS wrong with your unit and Bill will have to be the one to help you.

- Jack

[Desert Racer]

Forgot to mention I changed the factory computer tire size to 275/70/17 would that make a difference? I put on a 265/60/18 and my speedo is off by 2 under 65 and off by 5 above 65mph.

[Jackpine]

Originally Posted by Desert Racer

Forgot to mention I changed the factory computer tire size to 275/70/17 would that make a difference? I put on a 265/60/18 and my speedo is off by 2 under 65 and off by 5 above 65mph.

Now I'm really confused! First, what is the size of the tires on your truck? Are they 275/70R17s or 265/60R18s?

Next, what do you mean when you say you "changed the factory computer tire size"? The ONLY thing you can put into the Gryphon is the tire circumference - in millimeters.

And last, you didn't really just swap ONE tire did you? Because, when you say "I put on a 265/60/18 and....", that's what it sounds like!

- Jack