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Link G4 Plus Software Tutorial: GP Limits

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GP Limits

03.15

00:00 - Along with the usual RPM map and speed limits, the G4+ also offers two general purpose limits that can be used for a wide range of tasks.
00:09 To better explain these, we're going to go through an example of setting up an RPM limit to protect the engine in case of low oil pressure.
00:18 To do this, we have an oil pressure sensor connected and configured on analog voltage eight.
00:24 We can access the GP limits through the ECU settings menu by clicking on limits and then GP limit one.
00:32 By default, both GP limits are turned off so we need to select the limit mode.
00:37 In this case I'm going to use ignition cut.
00:41 We will leave the advanced mode turned off since this is a pretty straightforward RPM limit we're setting up.
00:47 Next we have a startup lockout which prevents the GP limit from becoming active for a certain amount of time after startup and an activation delay which prevents the GP limit from becoming active until the trigger condition has been true for a certain amount of time.
01:02 In our example for an oil pressure safety system, we want to have the limit become active immediately so we will zero the activation delay.
01:11 It may be advisable to allow a short startup delay of one to two seconds though to let the engine gain oil pressure on initial startup.
01:20 Now we can open the ECU settings menu and click on the GP RPM limit one table.
01:25 This gives us a 3D table with RPM on the X axis.
01:30 We need to change the Y axis though and configure this to oil pressure.
01:34 We do this by pressing X to bring up the axis setup menu.
01:38 On the Y axis, we need to select AN volt eight and then click initialise axis.
01:44 We can now click apply and close the window.
01:48 To make this example nice and easy, we're going to edit the RPM axis and remove most of the zones.
01:55 We will leave the zone at 3000 RPM and one at 3100 RPM.
02:00 Now we can start filling in the table.
02:03 We wan to firstly fill the table with an RPM value that is out of the way and won't let the GP limit do anything.
02:09 In this case we can set the RPM limit everywhere to 10,000 RPM.
02:14 This means the ECU will just use the normal engine rev limit.
02:18 If you set the GP limit close to or at the same point as the normal engine rev limiter, you may get into trouble if you try and increase the engine rev limit later.
02:27 Now let's assume that at 3000 RPM or below, we don't want to see oil pressure drop below 20 psi.
02:34 In the 3000 RPM column below 20 psi, we will set the RPM limit to 1000 RPM.
02:42 Above 3000 RPM perhaps we don't want to see oil pressure drop below 50 psi.
02:47 We can set all of the zones at 3100 RPM below 50 psi to 1000 RPM.
02:55 This table will now bring on a rev limit to protect the engine if oil pressure drops below the threshold we've set.
03:01 Of course you can develop a complete table to control this more accurately if you like.