New tires. 2" shorter. Need your help.
12-14-2012, 08:08 PM
#12
It is usually spot on within 1 mile or 2, You may still want to tweak a few things to your liking.
Tires are specified within a range. Things like climate, wear, level of inflation will affect the true size of the tire.
This function is available for both tire sizes and gear ratio changes.
HTH
12-15-2012, 06:10 PM
#16
I found it. It is in the speedo re-cal section. It has a whole list of transmission parameters that is changes.
Problem is it didn't help. I went with the true tire size of 29.9 first. Nothing chamged. I went back and said it was a 28.9 tire. Still nothing.
Regardless of throttle percentage it takes forever to shift. At wot it won't shift almost at al.
Can anyone help me what else I need to adjust. The only thing that changed was the new tires are 2 inches shorter.
Problem is it didn't help. I went with the true tire size of 29.9 first. Nothing chamged. I went back and said it was a 28.9 tire. Still nothing.
Regardless of throttle percentage it takes forever to shift. At wot it won't shift almost at al.
Can anyone help me what else I need to adjust. The only thing that changed was the new tires are 2 inches shorter.
12-15-2012, 07:27 PM
#17
I found it. It is in the speedo re-cal section. It has a whole list of transmission parameters that is changes.
Problem is it didn't help. I went with the true tire size of 29.9 first. Nothing chamged. I went back and said it was a 28.9 tire. Still nothing.
Regardless of throttle percentage it takes forever to shift. At wot it won't shift almost at al.
Can anyone help me what else I need to adjust. The only thing that changed was the new tires are 2 inches shorter.
Problem is it didn't help. I went with the true tire size of 29.9 first. Nothing chamged. I went back and said it was a 28.9 tire. Still nothing.
Regardless of throttle percentage it takes forever to shift. At wot it won't shift almost at al.
Can anyone help me what else I need to adjust. The only thing that changed was the new tires are 2 inches shorter.
There are 4 tabs in the speed calculator. Select the 4th one on the right labeled "Shift Point Correction" and change the size there. Then apply it Save the new file and up load the new tune. That will adjust the transmission shift points. Then make sure its corect under the "Speedo Calculator" tab as well.
If you did that did you save the new file before you uploaded it??? Any time you make a change you need to save it, but do so by adding a number or something to note the change and that you save it.
Last edited by 1FastBrick; 12-15-2012 at 07:33 PM.
12-15-2012, 08:15 PM
#18
Yes. I added "smalltire" at the end of the original file. I then reflashed truck with that tune. I will look at the tables and confirm that the values changed. I am very confident they did change but i will compair the two shortly.
12-15-2012, 09:05 PM
#19
I did confirm that the 29.9" tire adjustment was in the truck for the last test drive. I also confirmed and re-tried the 28.9" that is the actual mesurment of the tire.
Again no matter what throttle it won't shift correctly. And full throttle it won't shift at all 1-2 it will just sit at 6000 rpm and stay in gear till I let off a little bit. I logged the last run that I upped the 1-2 shift by 500 rpm and it didn't make a differance.
Again no matter what throttle it won't shift correctly. And full throttle it won't shift at all 1-2 it will just sit at 6000 rpm and stay in gear till I let off a little bit. I logged the last run that I upped the 1-2 shift by 500 rpm and it didn't make a differance.
12-15-2012, 09:30 PM
#20
I did confirm that the 29.9" tire adjustment was in the truck for the last test drive. I also confirmed and re-tried the 28.9" that is the actual mesurment of the tire.
Again no matter what throttle it won't shift correctly. And full throttle it won't shift at all 1-2 it will just sit at 6000 rpm and stay in gear till I let off a little bit. I logged the last run that I upped the 1-2 shift by 500 rpm and it didn't make a differance.
Again no matter what throttle it won't shift correctly. And full throttle it won't shift at all 1-2 it will just sit at 6000 rpm and stay in gear till I let off a little bit. I logged the last run that I upped the 1-2 shift by 500 rpm and it didn't make a differance.