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Old 04-07-2014, 10:52 AM   #6 (permalink)
Daox
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Location: Germantown, WI
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Another thing that I think is a big issue, and didn't see mentioned, is ignition timing. I think that after we hit the ~80% load, timing starts to be retarded to avoid knock. This reduces efficiency before the fuel enrichment happens as we're not able to take full advantage of properly timed ignition. I would imagine this leads to lower peak cylinder pressures, and thus lost power / efficiency.
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