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Discussion and questions related to the course EFI Tuning Fundamentals
does a little less compression ratio, let me have a time of ignition, a little more advanced?
Yes, running a lower static compression ratio can allow you to run more timing, however you lose specific fuel efficiency and can end up making the same power on more boost.
Modern engine tuning tends towards running higher compression ratios, and once you reach the limit of current fuel you are on, switch over to something like E85 instead, and then run more timing and make more power.