How do engines detect higher octane fuel? - Page 3

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    330i sport a big chunk of berlin...

     
     

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    Im going to throw this out there: Not all vehicles have knock sensors, yet the ecu can still alter for different grade fuel...how?

    Nearly all production vehicles are mapped to be extremely lean for emission regs
     
     

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    Quote Originally Posted by Mike@8BallTuning View Post
    Im going to throw this out there: Not all vehicles have knock sensors, yet the ecu can still alter for different grade fuel...how?

    Nearly all production vehicles are mapped to be extremely lean for emission regs
    But they will have lambda sensors.
     
     

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    So basically using super unleaded is probably best in our older e46's to limit chances of engine damage worth using then even for an extra £5 on fill up

    E46 coupe 318ci ,E46 convertible 330ci,E46 coupe 325ci ,E85 Z4R 3.0i,E46 coupe 330ci,E85 Z4R 2.2i,E46 convertible 318ci,E85 Z4R 2.5si
     
     

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    mines always bin run on super since i bought it, 128k miles on it...
    330i sport a big chunk of berlin...

     
     

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    suppose if ya aint got knock sensors using premium fuel is just wasted and of no additional benefits...
    330i sport a big chunk of berlin...

     
     

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    I will be using it again after ecu remap to get the best gains

    E46 coupe 318ci ,E46 convertible 330ci,E46 coupe 325ci ,E85 Z4R 3.0i,E46 coupe 330ci,E85 Z4R 2.2i,E46 convertible 318ci,E85 Z4R 2.5si
     
     

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    Quote Originally Posted by edber View Post
    But they will have lambda sensors.
    Correct.
     
     

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    Lambda sensors are going to have very little effect on octanes and ignition advance, they are treated separately.

    Almost all cars have knock sensors, but I remember the non vanos M50 was probably one of the last like that. Those had rigidly set advance, and they wouldn't pay attention to different fuels.

    Some newer engines like the E92 M3 now does knock detection with the spark plugs by ionising the gasses in the cylinder.
     
     

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    Quote Originally Posted by TheEnd View Post
    Lambda sensors are going to have very little effect on octanes and ignition advance, they are treated separately.

    Almost all cars have knock sensors, but I remember the non vanos M50 was probably one of the last like that. Those had rigidly set advance, and they wouldn't pay attention to different fuels.

    Some newer engines like the E92 M3 now does knock detection with the spark plugs by ionising the gasses in the cylinder.
    Don't they(lambda sensors) tell the ecu the amount of oxygen present which determines how the combustion is doing and therefore the ecu will alter the timing to suit?
     
     

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