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Old 11-30-2014, 11:40 PM   #5 (permalink)
ever_green
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Join Date: May 2011
Location: Toronto
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gueff - '19 Mercedes Benz A250 4MATIC AMG
90 day: 30.55 mpg (US)
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Quote:
Originally Posted by Baltothewolf View Post
Oh nice, well i hope you get a decent mpg bump from it! I know in high load scenarios my insight pings and once in a while knocks while in L/B, so I would definitely listen for that when over ~75% engine load and in L/B.
yes pinging is from overly high ignition timing. most manufacturers like to inflate timing and run at the hottest 14.7:1 AFR. this is mostly for emission purposes. My AFR enriches above 55% to something like 14.4 AFR and timing gets retarded. no knock from data logs so far.
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