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Thread: How do you adjust timing on mk3 1.8 eco ?

  
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    How do you adjust timing on mk3 1.8 eco ?

    as above ^^ my oldman was able to do it on his mx5 today by putting a wire inot the ECU plugs so it rem the new settings and then loosening a bolt so too enable him to move something on the end of the Cam or engine rocker block ??

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    You'd need to put an adjustable cam on it to do nething really, and get chip'd/re-mapped

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    oh right cheers ! think ill leave it be then i always thought the timing was ctrld by the ECU anyway i just wondered whether i cud do what my oldman was doin on his mazda

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    IIRC the MX5 engine has a distributor cap?

    In which case, you short out a pin or suchlike, to lock the timing from the ECU to a 'nominal' position. Then at idle RPM, you can adjust the dizzy to set the timing and then take the wire back out to return the timing advance to ECU control (to some degree)

    The latest Vauxhall engines are a little bit more advanced than Mazda's (for crying out loud, they are still flogging ****el engines!!!) and have given up on dizzys since about 1992. The ECU controls all timing, from the crank and cam sensors. It does not need to be adjusted at all, as the ECU optimises the sparking timing to get best power and fuel economy

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    Knock sensors really control ignition timing sending signal to the engine ECU. Cam and Crank sensors are used for cylinder recognition and start up.

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    Mmm did mention something about it having a crank sensor but it is a G reg anyway so may well have a dizzy , so to get the ECU to adjust the timing i can up the octanbe of the fuel right? how far or how high can i get it , i know you can out in super unleaded but if you put in fuel additives too will this make it any higher oor not or does it get to a set level and stay the same ?

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    Knock sensors on the engine are constantly altering the ignition timing anyhow. On modern cars you can use super/optimax and it will just adjust itself.

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    The knock sensor detects if the engine is starting to pink and either backs the timing off or increases fueling to compensate. It is quite complicated when you see how the ignition advance curves are set up on the ECU, but suffice to say it is running the engine at optimum at all times. This is why 'chipping' on modern non-turbo cars has fallen by the wayside a little bit now, the manufacturers are getting closer to optimum off the shelf now.

    The tolerances on the newer generation engines in work are pretty tight now, whereas a few years ago you could have probably made a good improvement by 'blueprinting' an engine, now they all leave the factory like that

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    so my 1995 is not worth bothering with then a far as timing or ECU goes ?

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    You cant do anything with the timing so thats that.

    With regards to remapping it would only be worth it (and thats debateable) if you had different head, cams etc.

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