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For what it’s worth, I was boosted on a stock block & pump gas up to 9psi, and when I decided to have my engine built, I had asked to maintain the 12.5 comp ratio to keep low end throttle response even if it meant a lower top end at the end. As DD reliability was a key goal for me The builders/tuners indicated they could do it, but strongly advised against it to keep some safety margin, so we ended up going for 10.0 CR. E85 is not readily available in my area, best I have is 94 octane. I think the build ended around 21/22 psi on HB. So it will interesting to see if the R&D on the new gen FA24 will find ways to reliably go beyond milder boost levels on a stock block when E85 is not available. nitro possibly ? However unless the tranny was also beefed up (I am not aware that it has), then that will remain a weaker point once you go beyond that anyway. My sense is that there will be more people that sit perfectly happy with a tune and some bolt ons without FI than on gen 1, and the bolder folks that do go all out, well they will just continue to do so... :-)
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