Practical Standalone Tuning: Step 6 : Idle Tuning ( Touchscreen )
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Step 6 : Idle Tuning ( Touchscreen )
| 00:00 | Now, that we've dealt with getting our idle speed dialed in using our laptop software, we're just going to repeat that using the touchscreen and obviously again there's a little bit less work for us to do here but let's dive in and see what's important. |
| 00:11 | We'll start by clicking on monitor, then monitors and we can have a look at our idle to start with and we want to just confirm that our idle is in fact on our hot target of 750, clearly it's moving around a little bit but yes it's doing what we expect, we also can see that our throttle position sensor is showing zero, so fully closed. |
| 00:31 | Our IAC position, just like we saw with our laptop, sitting at 10%, now obviously it's sitting at 10% now because I made that adjustment when we went through this process using the laptop software but exactly the same advice goes here. |
| 00:44 | If this was sitting instead of at 10%, maybe at 15 or higher, that means it's trying to bypass more air than is ideal and what we need to do then is crack that throttle plate open by turning our idle stop screw clockwise and a quarter to a half a turn at a time is enough, it's really easy to just make a small adjustment and then check how that IAC position settles. |
| 01:07 | Likewise, we've got our air fuel ratio sitting on our target and something I haven't talked about here, obviously if you're not using the hyperspark, this is going to be irrelevant but given that we do have ignition timing control here, we also are using the idle ignition control or the idle spark control where the ECU is able to advance and retard the timing in order to make changes to the engine torque at idle which in turn helps control the idle speed so we can see that's moving around doing exactly what we'd expect. |
| 01:38 | Let's click back here and what we want to do is come across to our learn parameters here. |
| 01:44 | So, what we've been doing, what the Sniper's been doing, what we've been talking is it's been learning, so we've got our closed loop compensation which as we can see at the moment's currently sitting at 0%, we are on our target, again our air fuel ratio's moving around a little bit but we're averaging around that 14.0 which is what we'd expect. |
| 02:04 | We can see that the current learn value for this particular area of our map is sitting at minus 6% so this is how the self learning works. |
| 02:13 | The closed loop control is our instantaneous control or result to affect an error between our target air fuel ratio and our measured air fuel ratio. |
| 02:23 | So, that's going to happen very quickly but of course that does move around a little bit. |
| 02:28 | Slower over time, it transfers the closed loop trims into that learn table and as it does this, obviously the closed loop trim starts trending back towards zero which is exactly where we are so for our idle at the moment, this is actually ideal, it's done exactly what we'd expect, the system is working and our closed loop trims are essentially doing nothing at the moment, it's learned or transferred the closed loop trims into that learn table. |
| 02:52 | Alright, let's head back here and we'll just have a quick look at our sensors as well. |
| 02:57 | So, again just like I talked about, we want to make sure that our idle speed target is realistic, 750 RPM, nothing's really changed there. |
| 03:05 | We can see our manifold absolute pressure, something we would be looking at as I already explained and our battery voltage, 13.5 volts, again this just shows that our alternator is in fact charging and let's just bring that RPM up a little bit using the throttle and we'll just see if that battery voltage does climb, it really doesn't, it's sitting around that 13.4, 13.5, not necessarily problematic but as I mentioned, typically we'd like to see that more at 13.8 to 14.2 volts but as I come off the throttle we can see that our manifold pressure is still stable and if we come back to our idle, we've settled back down to our 750 RPM idle and our IAC position's still sitting at 10. |
| 03:45 | So, at this point we're comfortable with everything, the car's idling nicely, we've got control over our fuelling, it's time to move onto the next step of our process. |
