Its not just timing that ur worried about limbo, in effect ur limited as u have mentioned by the fuel your using and the system around it in controlling predetonation. Timing is only one element u need to keep in check, predetonation isnt caused solely by timing.
For example, Pat (efiOZ)and myself have used in excess of 16:1 CRs on racing fuels, but the racing fuel alone isnt the sole reason that we can run 16:1, its the combination of the parts that we use that allow us to use 16:1. If we were to put normal street fuel into that thing, it would literally blow the thing up. If we changed another factor for example the restrictor size, but kept the 16:1 Cr and race fuel, the engine would still grenade itself.
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