Summary

can you also talk about how to adjust the air mass axis when dealing with a boosted car? So the air mass basically comes, that's inferred from our mass airflow sensor so basically the mass airflow sensor is telling the engine control module what mass of air is entering the cylinders and then that also becomes an axis for the likes of our ignition table as we looked at already in the lesson, we had grams per cylinder in terms of airflow.

00:00 - Dedrick's asked, can you also talk about how to adjust the air mass axis when dealing with a boosted car? So the air mass basically comes, that's inferred from our mass airflow sensor so basically the mass airflow sensor is telling the engine control module what mass of air is entering the cylinders and then that also becomes an axis for the likes of our ignition table as we looked at already in the lesson, we had grams per cylinder in terms of airflow.
00:30 So in some instances, some vehicles, what we may find is that if we're adding forced induction to a naturally aspirated engine, understandably we could end up with much more airflow than the factory tables would normally be expecting so we can basically end up falling off the edge of the table.
00:48 So this is where we do have the ability in most instances to adjust the break points for our various tables.
00:56 So we want to basically make sure that the break points for our tables are allowing us to stay within the table, basically we don't ever want to be falling off the edge because under those circumstances we don't really have good control over what the engine control module is doing, whether it is going to continue to interpolate the results before we got off the table or whether it's holding a fixed value or it might be doing something completely unpredictable so that's really the key, just making sure that we're always staying within those tables and adjusting those break points to suit.
01:27 We don't want to go too far with those break points though as well, we want to make sure that we've got good resolution so we don't want to be massively above and beyond the maximum airflow that we're actually likely to see.
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