I have a gryphon programmer. When I bought it I had the tune set to my 35's. I have since took them off (the 35's) for the winter.. I thought DAMN!! I'm getting good gas mileage , but soon realized it's because my tire size change.. Can I still run this tune, but some how change tire size for right mileage and speed?

 

Not sure if you can modifiy a custom tune or not...maybe somebody that has one will chime in...I know you can change a stock tune tire size....

 

Load the custom tune first. Then go through and reload the tune and when it asks if you want to make custom alterations (user adjustable options) go into there and change the tire to the correct size.

 

You can edit a custom tune from the Gryphon. Just load the custom tune, and it will ask if you would like to customize it, go to yes, you then can go to tire size and make the needed changes. Also, check your gear ratio, and make sure it is set correctly as well, they normally are set to 3.73, I have to change mine to 3.55

 

^ If your gears are stock, the PCM will know what it has. The 3.73 is the "placeholder" value that is there, when copying the stock tune it takes the values such as gear ratio from the PCM and puts that in there correctly.

 

Well thanks guys. I will be changing back to the stock tire size for the winter.. I think I have to figure it out in mm's though.. BTW I have a 4:10 gear.. Talk about gas consumption... But sure helps with the 35's when they are on..