WinOLS Mastery: Map Identification & Editing: Introduction: Audi Q7
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Introduction: Audi Q7
04.28
| 00:00 | In this worked example we're going to be applying the HPA 5 step map definition process to a 2011 Audi Q7. |
| 00:08 | This particular Q7 is a diesel, it runs a 4.2 litre twin turbo V8 and the specifics of the ECU fitted to this vehicle, it is a Bosch EDC17 or to be totally specific, an EDC17 CP44. |
| 00:26 | In a peculiar oddity with this vehicle, this actually runs two ECUs, a master and a slave. |
| 00:34 | And this does add some complexit , which we are going to touch on as we move through this worked example. |
| 00:40 | While I can't speak for the specifics about why two ECUs are used on this particular vehicle, one ECU runs one bank of cylinders and the other runs the other bank of cylinders. |
| 00:51 | One of the complexities here is that if we are going to be doing a bench read or more specifically a bench write to the ECU, then we're actually going to need to write to both ECUs, essentially any changes we make to our mapping, these will be applied to both ECUs. |
| 01:08 | One of the ECUs is relatively easy to locate, it's in the scuttle panel on the passenger's side of the vehicle for a left hand drive vehicle. |
| 01:17 | The right hand drive vehicle we've got here of course, the ECU is in the same location, now on the driver's side. |
| 01:23 | The other ECU is much much more complicated to get to, hidden way further down in the scuttle panel so it is a little bit of work. |
| 01:31 | Now, this comes down to the way we can read and write and the tools that we're going to use. |
| 01:37 | In the worked example we're going to be using our AutoTuner tool, which can read and write via OBD2, via the bench method or directly to the PC board via the boot method. |
| 01:49 | Our other tool that we've used through the body of this course, our B-Flash unit, interestingly cannot perform a read or write via OBD2, so this limits what we can do. |
| 01:59 | The AutoTuner tool makes a lot more sense for us because particularly when we get into the tuning, which we won't be covering in this worked example, we're going to be making various iterations to the tuning changes and obviously this requires writing to the ECUs frequently. |
| 02:17 | It's going to be possible but cumbersome and time consuming if we were to do this via the bench method. |
| 02:22 | In another element with this vehicle that is specific, we already are dealing with a tuned ECU here and we've dealt with this in the course talking about the fact that often with a virtual read, we're going to be reading a stock file from an internet server and this is going to mean that if we do take a virtual read and our ECU has already been tuned, then we're going to lose any of those tuning changes. |
| 02:47 | So, when we move onto our reading step here, we will be reading from the ECU via the bench method, we only need to read from one of those ECUs because they are identical. |
| 02:57 | This will give us a full backup and because this is an actual read, it gives us all of the existing tuned data. |
| 03:04 | We can then fit the ECU back to the vehicle, we'll be forming an OBD2 read, which will be a virtual read, that gives us a stock file, which we've already discussed in the body of the course, we really want to be starting from that stock file anyway, so we've got no potential baked in errors. |
| 03:20 | Now, in terms of the vehicle itself, it is 100% stock standard, so no hardware modifications in terms of exhaust system, inlet and air filter and in stock form, these vehicles are rated at around 250 kilowatts flywheel and 800 newton metres of torque. |
| 03:37 | As with most late model common rail turbo diesel engines, there's quite a potential headroom inside of this engine, but we do also need to be careful when it does come to the tuning element, because we can push this engine quite hard and make a lot of power and it'll probably not be quite safe until we start towing a heavy load. |
| 03:59 | So, here with all diesel engines it does become a bit of a case of compromise, we want to make sure that the vehicle is going to remain safe if it is used to tow heavy loads. |
| 04:09 | So, in this situation the tuning technique and how much headroom we allow or leave on the table is going to depend on the usage of the vehicle. |
| 04:18 | Now, that we understand what we're dealing with and the vehicle that we're going to be towing this work on, let's move onto the first step of our process. |
