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Thread: ECU reset, fact or fiction?

  
  1. #1
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    montyfox's Avatar
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    ECU reset, fact or fiction?

    Fitted a milltek catback sytem to my zaffy gsi last night as the last in a series of minor mods which include:

    K+N panel filter
    Vectra intake pipe
    de-restricted air box
    pre-cat pipe
    VXR boost pipe (to be refitted when my decent hose clips arrive)
    Bored out and polished plenum/top hat
    NGK iridium spark plugs

    I will be attending a rolling road day next month and getting some kind of remap later maybe, but what i would like to know is if its worth resetting the ECU or not?
    I've read on here that yes, do it but there are some who say cobblers, its a myth that resetting has any benefits at all
    So i'd like to hear from people who have done it and confirmation that its woth doing or not and also the correct prcedure for resetting without c**king any thing up,alarms etc

    cheers!

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    liamSRi's Avatar
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    to reset it all you have to do is leave the battery off for an hour, but if you want the most from those mods then you will have to get it remapped.

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    Cheers for that, but if i just disconnect the battery doesn't that cause problems with the alarm going off?

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    Quote Originally Posted by montyfox
    Cheers for that, but if i just disconnect the battery doesn't that cause problems with the alarm going off?
    Not if you disconnect it within 15 secs of switching the ignition off - it's best to loosen the nut in readyness, so you can quickly flip it off

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    Ah ha, thank you very much!

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    put the key in and turn the ingnition to position 2 then go take the negative terminal off the battery and your alarm wont go off mate

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    MarkyG's Avatar
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    ECU will learn from whatever you put on anyway, just if you "reset it" its learning from the factory default/blank values, so it should learn faster.

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    so the only benifit of resetting the ecu is if you have been running on 95 octane fuel then put 99 ron fuel in it will just learn the new fuel level rather than just driving 30 miles to get the same effect?
    SMIC, miltek catback, precat, Thorney remap 242.7 bhp 281lb/ft torque

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    Enkidu's Avatar
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    Usually takes about a tank of fuel for the ecu to learn without disconnection..... It'll be exactly the same timeframe if you do disconnect but it wipes any bad mappings etc and re learns from a blank sheet.

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    Bean Astra GSI's Avatar
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    Hi this may sound silly but my gsi has been re-mapped, re-setting the ecu won't affect this will it???

    Cheers

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