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Map variances… sorry I missed this while catching up. Two maps can be “data” identical but “functionally” different while two other maps can contain very different data but be functionally identical… drawing conclusions by looking at files alone can be very misleading.
RandomHero’s post is spot on… nicely said by the way.
I’ve previously posted that some parts effect power, some effect tuning, some effect both, and some effect neither. In the case of the Stock, All Drop in Filters, and All Cat/B maps there’s no rescaling because the MAF and its housing are identical so the tuning is, correspondingly, the same (for the same fuel octane).
What can/might change is the engine's maximum airflow volume if some/all parts breathe better. While the Unichip can be set up to account for that change by changing map data at specific points (which you'd see in a data comparison), it can also be set up to do so by selecting airflow as the map’s load reference (which you won't see in a data comparison)… airflow determines the tuning solution.
As an example, a stock engine might pump enough air to move the Unichip to load site (airflow) 12.4. If a Drop In Filter flows better, that same engine might pump more air and drive the map to load site 12.6… load site 12.6 has a different value than load site 12.4 so the tuning is “functionally” different but both data points are contained in the same map. From a “data” perspective, the maps appear identical. The engine that’s breathing better gets to parts of the map the stock vehicle never gets to.
Some parts create big changes and others little to no changes. In the case of Drop in Filters and Catb's, the tuning requirements are essentially identical.
Where you'll find changes are in different octane maps for those parts and in the corresponding Fuel/Timing In/Standard/Out maps. Those maps more than compensate for individual vehicle variations for any combination of those parts. One will be a very close fit for any production FT86 with those parts.
Cheers
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