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Thread: Knock sensor when supercharging?

  1. #1
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    Knock sensor when supercharging?

    Hi

    I am in the process of supercharging my e36 323i 1997.

    I was wondering...will the standard knock sensor still do its thing and retard the ignition and save the engine from knocking itself to death if the AFR and ignition goes wrong or out and causes knock.

    Im just worried that when i up the boost abit and put bigger injectors and possibly try and do abit of a tune myself, im going to destroy the engine.

    Also does anyone know anyone or anywhere that is able to tune a stock ecu around london ways?

    cheers

  2. #2
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    Anyone?

  3. #3
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    The knock sensors should still work with a proper stock ecu tune. I don't know whats availible in the UK but the stock ecu tuners in the US can tune it remotely.


    86 325es, 2.8L m50, S476sxe, ProEFI 128 ecu, e85, solid rear axle, TH400 trans, 28x10.5w slicks, zip ties, popsicle sticks, tape
    best time 9.06 @ 151.8 mph, best 60 foot 1.30

  4. #4
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    Cheers someguy.

    So if i was to run the engine and the tune wasbt quite right. You think the knock sensor would still prevent the engine from destrying itself?

  5. #5
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    If the knock sensor are setup to pull the correct amount of timing, then maybe. If the tune is so completely wrong that pulling a few degrees of timing still doesn't keep it from detonating then your on your own. I don't know what the factory ecu knock retard strategy is, I run megasquirt.


    86 325es, 2.8L m50, S476sxe, ProEFI 128 ecu, e85, solid rear axle, TH400 trans, 28x10.5w slicks, zip ties, popsicle sticks, tape
    best time 9.06 @ 151.8 mph, best 60 foot 1.30

  6. #6
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    Also depends on the mods you'll do to your engine. Knock sensrs are acustic sensors with bandwith filters. The knock freuqency depends on the engines displacement, but also other noises that engine and transmission makes need to be taken into account. So the stock knock sensor and the stock ECU is configured to read knocking on the stock engine. I'm not saying it's not going to work if you're "just" adding the turbo, but if yor're building a stroker for instance...
    BTW, when running knock sensor on MS - I guess it requires some calibration, right?

  7. #7
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    Quote Originally Posted by Vexatus View Post
    BTW, when running knock sensor on MS - I guess it requires some calibration, right?
    Yes it does. Basically you just need to set the gain on the sensor so that the drivetrain noise does not push it over the knock threshold.


    86 325es, 2.8L m50, S476sxe, ProEFI 128 ecu, e85, solid rear axle, TH400 trans, 28x10.5w slicks, zip ties, popsicle sticks, tape
    best time 9.06 @ 151.8 mph, best 60 foot 1.30

  8. #8
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    Definatley something worth doing when tuning the engine!

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