Some recent cars and a lot of bikes can change engine mapping and change engine braking electronically. For instance, my bike is not an automatic bike, so it has mechanical gears and I am able to electronically choose 3 levels of engine braking.

From my understanding, engine mapping consists in changing the proportion of fuel and air depending on a lot of parameter (gas throttle, pressure, temperature, RPM, exhaust data...). During engine break, from what I heard/read, no fuel is injected.

So, how does engine braking mapping work? Does the bike/car inject fuel during engine braking in order to lower it? Or does it change other parameters I'm not aware of?

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    Welcome to Motor Vehicle Maintenance & Repair! Commented Aug 24, 2020 at 9:10
  • Thanks! I'm not sure this question is on topic here, if it's not feel free to tell me and I'll try to rephrase it so it will be on topic.
    – LP154
    Commented Aug 24, 2020 at 9:12
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    Engine Theory questions are on topic here. I'm not quite sure if this can be answered, though, mainly because I don't think "one size fits all", meaning, it probably depends on how the engineers develop the mapping for any given engine. Also, while most cars have a level of engine braking, its not really user adjustable as you are describing for your bike. Commented Aug 24, 2020 at 9:15
  • I changed a bit my question so it's more answerable. I removed the consumption part because it's a different question and as you said, it will vary depending on the brand.
    – LP154
    Commented Aug 24, 2020 at 11:46
  • Engine mapping involves much more than just fuel delivery...
    – Solar Mike
    Commented Aug 24, 2020 at 11:56


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