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Practical Standalone Tuning: Step 5: Initial Startup

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Step 5: Initial Startup

04.47

00:00 - OK so now we're going to look at our initial startup and getting the car up and running.
00:05 And there's a few things we want to consider here.
00:09 First of all the engine may not want to keep running by itself, so we need to be prepared to use the throttle to keep it running.
00:17 And we also want a way of making quick changes to a block of the fuel map so that we can quickly increase or decrease the fuelling as we need to.
00:30 At the same time what we're going to be using as a reference is our lambda value here on the dyno screen.
00:37 So we're going to be referencing that and watching for the correct air fuel ratio that we want to run while we're getting the engine running.
00:47 Now at this point we're not too fussy, we want somewhere around about 0.85 to 0.95 lambda and that'll be enough to get the engine running at this point.
00:58 So we'll just try starting it and see how we get on.
01:05 OK so that's not uncommon there.
01:07 We got the engine to start and run and then it stalled.
01:11 So we'll just restart that and see if we can keep it running with a little bit more throttle.
01:21 OK so the engine's running but it's not running particularly happily.
01:25 And we can see if we look at the lambda on the screen on the laptop, it's also very very lean.
01:33 So what we're going to do is just add a large amount of fuel to that particular section of the map and try again to get the engine running.
01:52 OK so now you can see that the engine's running quite happily.
01:56 We're at 1500 RPM and our lambda's sitting at 0.85, 0.84 So what we can do there is use the shift and Q and A keys to increase or decrease the fuelling until we get the engine running where we want it.
02:12 And as I said at this point, all we're looking for is a lambda value of somewhere around about 0.85 to 0.95 And while the engine's warming up we can also continually make changes to the lambda to the fuelling until we get the engine up to temperature and just make sure that everything's running properly.
02:34 So it's reasonably easy to do, and this is a good example of where those base numbers in the fuel table have not been where we need them to be.
02:44 So you can see we've gone from what we had there was 30, we're now up at 49.5 So we're a long way away from where we started.
02:54 But you can also see how quickly and easily I can make that change.
02:58 Now if I see a number down here of 49.5 in the idle areas and I can see that my air fuel ratio is pretty close to what I want it to be, that would suggest to me that probably we're going to end up running out of resolution in the map which means that when we're at wide open throttle and full power up in this area of the map over here, we may end up getting numbers that run off the limit of 100%.
03:26 If that is the case, and we're going to see if that does work out to be the case, what we can do is go back and we can change that master injector pulse width, and we can rescale our entire fuel table to get the resolution correct.
03:40 So we're going to look at that when we get to that point of actually tuning the whole table.
03:45 Now while we're letting the engine idle and warm up there, what we also want to do is just make sure that everything else checks out.
03:56 So if I go through to our run time values and look at our analog voltage screen, you can see our battery voltage there's sitting at 14.1 volts.
04:05 We can also see that the engine vacuum here, manifold pressure is sitting down at 28 kPa so the engine's pulling good vacuum.
04:14 And basically everything mechanically seems to be in order, the engine's idling quite happily down at 1200 RPM and it's reasonably smooth.
04:25 If you look back at the the lambda you can see that as the engine has started to move out of warm up enrichment, we're now at 0.99 lambda.
04:34 So it's actually idling quite happily, basically at a target of lambda one.
04:38 So that takes care of our initial startup.