June 16, 2019, 10:24 AM
markemarkMSD Grid to check Delay Box Accuracy
MSD Grid to check Delay Box AccuracyI’m re-posting this because the original posting link is corrupt.
To check the Delay Box accuracy / repeatability with Grid you would follow this method of wiring / programming. The delay box would need to have a +12v input to trigger using this method. NOT a ground input.
Attach any Step wire to the delay box Trigger Terminal. Nothing will be programmed into the Step function.
In Grid Data Acquisition / Start Recording tabs program the Engine RPM Above to 500 and the AND to whatever Step wire you are using.
In Grid Stop Recording tab program the Engine RPM Below to 100 and the Max Record Time to a minimum of 30 seconds.
Here’s what happens when you push the TB button. The +12v will turn ON the Step function in Grid along with arming the delay box. The Delay Box is also outputting +12v to the TB solenoid and Grid Launch wire. This will also start the Grid Data Acquisition record feature.
When you release the TB button the Step turns OFF in Grid and the delay box is timing out. When the delay box times out the +12v is removed from the TB solenoid and the Launch wire in Grid.
In the Data Acquisition you want to measure the time period from when the Step function goes from High to low, to the Launch input going from High to low. To accurately measure this time period you need to expand the acquisition to the maximum resolution to set the cursors on the transition lines of Step and Launch.
In the photo below is a friends Dedenbear CC3 I was using set to 1.000 of delay. As you can see it is very accurate and did repeat several times when checked.
In the Elite 95 delay box that I am now using, this box is consistently longer in delay by 0.0025 seconds. As long as it repeats, then everything is working properly.
