Let's do a simple adjustment. Let's recalibrate our speedometer.
My gear ratio is 4.56, and my tire size (in metric) is 315-80-15.
So, first we select the ratio by clicking the "Adjust" button next to "Axle":
When I select 4.56, the tire size adjustment opens automatically like this:
After selecting all the settings. I have this:
Oh, and you have to click "Adjust" on the tire size after you set them or you won't see this. For some reason, after automatically asking you for it, it doesn't show it to you until you hit the button next to "Tire Size"
Now lets adjust shift firmness. Let me say this about the adjustments:
1-2 shift is really 2-3 shift. 1-2 shift is just applying the OD and it's not adjustable.
2-3 shift is really 3-4 shift.
3-4 shift is really 4-5 shift.
See, these points are based on the 4 speed transmission that the 5 speed auto really is, with an overdriven 1st gear to make a "new" second gear. I may be wrong about this, but it feels like I'm right from what I did. You can experiement with it.
Okay, we click on 2-3 Shift Line Pressure "View/Adjust" button and we get this:
This is a bit confusing now, so read carefully.
Up until now, we've used "actual" measurements like the gear ratio and the size of the tires. Now we're into "relative" adjustments where we will just be putting in "global adders" to the base tune. The base tune is whatever values are in the tune you are editing. You can NOT see the "actual" values -- you can just adjust them up or down some from where they were "tuned".
Note that you have three adjustments for light, medium, and heavy throttle. These will be used to create a "curve" adjustment across the entire throttle range.
Adjusting one of these sliders to firmer (positive numbers) increases shift firmness, and going negative gives gentler shifting. Usually, you need it firmer as you go up the powerband, but what you actually need will depend on what you got from the tune you received and where you need to go.
So, lets set light to one notch firmer, medium to two notches, and heavy to three notches. This is what I actually did for my truck and you can feel the difference even in small changes like this.
Alright, let's click "Apply" and go back to the main adjustment screen.
When you get back to the main screen, click the "Accept" button in the lower left corner.
Congratulations! You've just customized a tune!
Next: saving tunes and loading them into the Xcalibrator.