Important Information - US Shift Quick 4 GEN2 Installation And Operation Manual

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Table Of Contents

Table of Contents

Writing a Calibration to the Quick 4

For the changes you've made to take effect on

the Quick 4 controller, you first must write the

calibration to the unit. Connect the Quick 4 to

your computer using a standard USB cord (Type

A to Type B). Click the Write Calibration

button on the toolbar and a menu will appear. If

you aren't using multiple calibrations, click the All

Tables button to save the calibration to the

controller. The Quick 4 can now be disconnected

from the computer. (To use multiple tables, you can create a new calibration and

choose one of the other table buttons when writing to the controller.) When the

Quick 4 unit is disconnected from the computer, the Write Calibration

button will be grayed out.

How to Avoid Errors

The Shiftware software gives you complete freedom and flexibility to customize

your shifting calibration however you want. This freedom requires diligence to

avoid errors.

It is very important that the up-shift and down-shift curves for a given gear do

not cross. The up-shift point at any throttle position should usually be at least

15% greater than the down-shift point. For instance, if the 2-3 up-shift point at

½-throttle is 45MPH, then the 3-2 down-shift point should usually be less than

40MPH.

The "On-Off" differential between up-shift and down-shift points is called

Deadband (also known as Hysteresis). The more deadband you use for your

shift points, the more stable the system will be. Not using enough deadband can

result in erratic shift behavior. Too much deadband will result in sluggish

behavior due to a reluctance to down-shift.

Pay close attention to the interaction between different shifts. Overlapping the

1-2 and 2-3 shifts can cause skipped gears and other drivability problems.

Also note that torque converter slip at low speeds renders engine RPM values

meaningless. It is usually desirable to have light-throttle shift points within a low

RPM range. In this case, it is best to base light-throttle shift points on vehicle

speed rather than engine RPM (as most auto manufacturers do).