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Message: <blockquote data-quote="astroboy" data-source="post: 378818" data-attributes="member: 4527">Variable timing engine design allows timing to retard/advance to a greater degree than non variable timing car. That's why u'll see 10.6:1 compression engine can retard timing all the way down to using RON91 without issue. The measurement of compression is taken by compressing the air in the combustion chamber without running the engine. Once turbo engine is running the FI would boost the combustion pressure and that's why they can't use low RON fuel. I still think detonation has everything to do with high compression.. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" /></blockquote>