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The short answer is: Because it may ping under load without it. Basically the engine was designed (e.g., compression ratio) and tuned (e.g., ignition advance) to make optimal power on
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10-28-2010, 10:08 PM
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#32 (permalink) |
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A True Z Fanatic
Join Date: May 2010
Location: nirvana
Posts: 6,394
Drives: 2023 NATM
Rep Power: 420   |
The short answer is: Because it may ping under load without it.
Basically the engine was designed (e.g., compression ratio) and tuned (e.g., ignition advance) to make optimal power on 91 AKI / 96 RON. That said, it is worth noting: 1. The owner's manual claims it may ping under load anyway  2. It runs very rich approaching fuel cut; rich mixtures cool the combustion chamber with unburnt fuel, and acts as an anti-detonant.
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