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Thread: 2017 CX-9 Engine Braking/Downshifting

  1. #1
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    2017 CX-9 Engine Braking/Downshifting

    Hello Everyone,

    Got my new 2017 CX-9 Touring last week. Noticed a couple of days ago, when releasing the gas pedal, the car starts do decelerate rather quickly - a couple of mph/sec, does not coast. Tried at different speeds from 20-45. Is it downshifting? and is that normal? Tried to coast on neutral, and everything is fine, no speed loss. On my old 2008 Mazda 3, same thing happens when put to manual drive mode, and try to coast on the 1st gear. Any suggestions?

  2. #2
    Registered Member Xeler8ing's Avatar

    '18 Mazda CX-5 Akera KG i-Activ AWD 2.5L In Sonic Silver

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    Hello!

    It's called engine braking. Most Skyactiv engines combined with automatic transmissions have this feature.

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    Thanks! Guess I just have to get used to it.

  4. #4
    Registered Member Xeler8ing's Avatar

    '18 Mazda CX-5 Akera KG i-Activ AWD 2.5L In Sonic Silver

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    Quote Originally Posted by Danilius View Post
    Thanks! Guess I just have to get used to it.
    No problem and you will be fine with it

  5. #5
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    Mazda CX-9 Grand Touring 2016

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    In the past when coasting the transmission was made to disengage from the engine and let the car coast longer. It was found that keeping the driveline connected but shutting off all fuel to the engine was more economical. I think that's what our cars are doing...the coasting car is keeping the engine turning over.

  6. #6
    Registered Member Xeler8ing's Avatar

    '18 Mazda CX-5 Akera KG i-Activ AWD 2.5L In Sonic Silver

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    Quote Originally Posted by PTguy View Post
    In the past when coasting the transmission was made to disengage from the engine and let the car coast longer. It was found that keeping the driveline connected but shutting off all fuel to the engine was more economical. I think that's what our cars are doing...the coasting car is keeping the engine turning over.
    Engine braking allows more car control when/if needed compared to cars that coast more.

  7. #7
    Registered Member TinyTires's Avatar

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    2017 CX-9 Engine Braking/Downshifting

    I like the control aspect of engine braking (2017 CX5 GT) Does engine braking add wear and tear on auto transmission?
    Last edited by TinyTires; 06-13-2018 at 03:41 PM.

  8. #8
    Registered Member Xeler8ing's Avatar

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    It shouldn't otherwise they would not allow it to do it
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