Plug Gap

[Charged Performance]

Frequently when increasing boost or when adding FI to an NA engine the gaps are recommended to be tighter. Reference is usually to the idea of the spark being "blown out" like a candle or something. I don't exactly buy the explanation but the gapping method is pretty common.

As someone who used displacement and high compression for quite some time before going the FI route I usually reduced my gap as I would increase CR. I don't know all the technical reasons that it works but I suspect in higher compressions (whether high CR or FI) of air/fuel charges the spark is stronger or more consistent or something when the gap is tighter.