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Old 06-13-2019, 08:03 AM   #15
97AutoXVette
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Drives: 2013 Golf R
Join Date: Apr 2019
Location: Cincinnati, OH
Posts: 24
Quote:
Originally Posted by TimS View Post
Octane requirement is dictated mainly by cylinder pressures and timing curve; changing the intake and exhaust doesn't change either of those things (the valves are closed and the cylinder is sealed during the compression stroke), so required octane doesn't change. Even if lower temps mean it doesn't pull timing as much, the difference is nowhere near allowing 89 when 91 is required.
Great info. really appreciate it!
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