Knock retard at partial throttle on the freeway

Discussion in 'Mazdaspeed 3 General Discussion' started by Matt Dickey, Apr 6, 2021.

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  1. Matt Dickey

    Matt Dickey Greenie N00B Member

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    Hey guys forgive me if this has already been covered but i couldn’t find anything but im registering knock consistently on my AP V3 when at very moderate throttle opening during cruising speed on the highway for example i will be cruising at 75 and if i ease on the throttle or ease off the throttle i will register 5.45 on my knock sensor and it will slowly taper off to 0 or if i let off the throttle it will drop immediately same thing with acceleration. Im wondering if this is just ignition retard for fuel economy purposes or something else. I can make a data log if necessary. Nothing is wrong with the car otherwise and when this happens i dont notice anything happening as far as weird noises or vibrations. Any input would be awesome not really concerned because i dont register Knock retard at full throtte or under any other circumstances so im not concerned just curious
     
    Matt Dickey, via an iPhone, Apr 6, 2021
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  2. The_big_dill

    The_big_dill Greenie Member

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    While I appreciate your concern for the data, this is a known condition for fuel economy purposes. Knock at light load is OK, and at times intentional.
     
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