IQ3 Street Logger Dash Installation Manual
44
Shift Lights
To program the shift lights, simply determine the RPM Channel to activate the shift lights (typically
Engine RPM) then select the shift point for each gear. Finally, select the RPM Interval between each
shift light.
Example: Shift point for each gear is 5000 RPM. Interval
is 100 RPM. With 5 shift lights in use (10 total lights that
are displayed two at a time), the software will calculate
back from the programmed shift point and start the
shift lights at 4600 RPM and increment to 4700, 4800,
4900 and with all lights on at 5000.
Shift Light Formula: Shift Light Interval x 4 minus Shift
Point = Starting Point of Shift Lights
100 x 4 = 400. 5000 – 400 = 4600 (start of shift lights)
Gear Calculation
The gear position is most easily configured using the IQ3
Setup Mode 2 programming. The IQ3 derives the gear
position by calculating the ratio between the engine rpm
and speed at the time each gear is programmed. The
selected speed channel is also used to maintain the
odometer.
It is also possible to manually enter the ratio values using
the Gear Calculation tab. However, the ratio value is not
the transmission or final drive ratio, but instead is the ratio between engine rpm and speed.
DataLink can calculate these ratios for you by entering the transmission ratio for each gear and
the final drive ratio in the transmission for FWD vehicles or differential gear ratio RWD vehicles.
Enter the tire rollout in inches if the speed channel you have selected is in MPH units. Enter the
tire rollout in centimeters if the speed channel you have selected is in KPH units and check the
“Speed Units in KPH” box. Uncheck all unused gears to disable them. After you have entered all
of the required information, click the “Calc” button to calculate and fill in the RPM/Speed ratios.
Click the “SEND Configuration” to program the ratios in to the IQ3.
Since only the RPM/Speed ratio values are programmed in to the IQ3, the transmission ratios and
tire rollout values are not saved in the DataLink configuration file. You will need to reenter
these values each time you need to make a change. The formula used to calculate the
RPM/Speed ratio when speed in in MPH units is shown below.
1 / ((Tire Rollout / 12 * 60 /5280) / (Gear Ratio (n) * Final Drive Ratio)) = RPM/Speed Ratio for Gear(n)
Example: using 90” tire rollout, 3.41 1st gear ratio, 3.50 Final Drive Ratio (Differential gear)
1 / ((90 / 12 * 60 / 5280) / (3.41 * 3.50) = 1 / (.08522 / 11.935) = 1 / .007140 = 140.05 Gear 1 Value