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by dumptruk
1422 days ago
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Some vehicles, especially ones with OEM performance tuning, run high compression ratios or forced induction. Higher octane gas allows for more compression within the piston before ignition. I had a 2003 Toyota Matrix that redlined at 9100 rpm and used their fancy Toyota variant of VTEC that would dynamically swap the camshafts on the engines past a certain RPM. Although the engine was naturally aspirated (no turbo), it had the compression ratio of 11.5:1, which is pretty high for an economy vehicle (1.8L) |
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