The Gear/Tire Wizard

When tuning GM vehicles, the Gear/Tire Wizard can be used to calibrate the speedometer and scale the transmission tables to adjust for a new gear ratio or tire size.

1.

In the menu bar, select Edit > Gear/Tire Wizard. The Gear/Tire Wizard window appears.

2.

In the column on the right, enter the new Tire Size in inches. If the size has not changed, enter the same value.

NOTE: This value is the height of the tires. It must be entered in inches, even if metric units are selected.

3.

In the column on the right, enter the new Gear Ratio. If the ratio has not changed, enter the same value.

4.

Normally, the wizard will automatically determine a Multiplier for scaling the transmission tables that maintains similar shift RPMs.If you would prefer to manually enter a different multiplier:

a.

In the upper-right corner of the window, select Manual Scale.

b.

Enter the new value in the Multiplier box.

5.

Click the Adjust button.