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Practical Standalone Tuning: Step 3: Base Table Configuration

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Step 3: Base Table Configuration

05.26

00:00 - OK so the next step in the process is to set up the base tables so we can actually get the engine up and running.
00:08 And we're going to look at that now, so let's start with the fuel table.
00:12 So first of all we want to choose a sensible axis for our load axis.
00:18 Now I'm actually going to show you how we would set this up if we were going to use throttle position as that load axis.
00:26 Normally we'd use manifold pressure on an engine that's running a single throttle body and a plenum.
00:31 But just so I can show you how that would look if you were running perhaps individual throttle bodies, we're gonna go through the process of setting this up on throttle position.
00:41 So in the Link software, if we press the X key, we get an axis setup menu.
00:47 So here is our Y axis which is what we're using for load, and what we want to do is cycle through and choose TPS main.
00:56 Now there's a little button here which will initialise that axis and that just basically gives a predefined number of set points or axis points on that load axis.
01:08 But as we talked about in the course, the air flow through a throttle body is very non linear so what we're going to find is that we want to add in some points in and around closed throttle.
01:20 So what I'll do to start with is I'll just get rid of these standard starting points and we're going to add in our own.
01:28 So we'll start with a point at zero, then we're gonna go to 2%, then 5%, then 10%, then 15% and then 20%.
01:38 So what we're doing is we're getting in some quite fine resolution in around that closed throttle where we're getting that first in rush of air as the throttle body opens.
01:48 Once we get past that initial opening, we can open out that spanning a little bit further, and we can go with 40, 60, 80, and 100%.
02:02 So that would get our throttle position table set up properly.
02:07 The RPM axis is already set up correctly, we've got zones every 500 RPM.
02:12 We're going to run this engine out to about 6500 and you can see we've got zones out to 7000 so we can click apply down here, that will bring up this box asking us if we want to interpolate the values in the table.
02:28 Because we're starting from a blank table, it doesn't really matter, we can click no.
02:32 And you can see now that the table is set up with our correct span and our correct break points or load points.
02:40 So now we can go to our ignition table and we can do the same thing there.
02:45 So again if we click on X we can make the changes we need.
02:50 Now we want to again set up our axis on throttle position and we'll just click on initialise axis.
03:01 So as I've said in the course, we don't need to be quite as fussy with the load points on the ignition table, it's not quite as fussy about the load.
03:15 So we can get away with slightly wider load points and I'm going to put those in every 20%.
03:21 So again we can click apply, and that will give us our table.
03:27 Now before we go on though, we want to get some numbers into that table that are going to be a good starting point.
03:33 And in the ignition table we can just start again with 15 degrees everywhere.
03:39 If we jump back to the fuel table and we do the same thing there, we're just going to start by entering a number of 30 everywhere in the table.
03:50 And we may need to make some changes to this when we actually go to start the car, but for now that's where we're going to set the fuel table.
04:02 We also want to set up the fuel injector dead time tables.
04:06 So in the Link software, we can get to that by clicking on injector dead time, and here we've got our 2D table of dead time versus battery voltage.
04:16 So we need to set this up to suit the injectors that are fitted to the car.
04:22 So basically our tables are now configured and we're ready to move on.
04:26 One more thing before we do go any further though, this is a good time to have a look and set up an RPM limit if we haven't already.
04:35 So in the G4 software, if we go to RPM limit, we've got some options here.
04:42 And we can select the particular RPM limit mode that we want to use.
04:47 In this case it's set to ignition cut.
04:49 We can also select fuel cut or there's a rotary only mode which does fuel and ignition cutting together.
04:57 We're going to leave that set to ignition cut and down here we actually have the RPM limit table.
05:03 So we just want to make sure that these numbers in here are sensible and we're not going to run into any problems with potentially over revving the engine if something goes wrong while we're setting it up.
05:15 So everything's set up OK there, we've got that set to 6800 RPM which I'm happy with.