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Thread: Fuel Vs mapping.

  1. #1
    Regular Member Netstar's Avatar
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    Default Fuel Vs mapping.

    Hey guys.


    Im booked for a map on 20th March. Apparently you should not run a remapped Vectra VXR on anything less than 97RON, idealy 99.


    When a Vec is mapped does the new map start with a clean slate on the fuel front?

    I know the ECU will adapt to different fuel after a short while (anyone know roughly how long/much fuel?) and I've also seen threads where people who have switched fuels have disconnected the battery for 1/2 hour to get the ECU to adapt quicker.

    What i mean is, once a car is mapped, does the ECU adjust straight to the fuel currently in the tank or does it still remember from before?

    Is the map like a clean slate for the ECU?

    Reason I'm asking is, there has been a shortage of Super Unleaded in my area lately. Both T99 and VPower. I'm worried that if i have to fill up with 97 or 95 RON to get me to the tuners, will this mess with the map? And would it be worth me using an octane booster if I have no other choice?

    Any advice appriciated

    Matt

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    "Mapping to fuel" as you put it is as simple as reading the anti-knock sensor's output, so really it's adjust at each individual rotation of the engine.

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    Regular Member mushy2007's Avatar
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    Spoons may be able to offer some advice here!

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    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

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    Default

    If the engine has a knock sensor then it will accomodate higher RON fuel IF the map has the provision for this. If there is no knock sensor, then the ECM will NOT do anything, as it won't 'know' the difference in RON of the fuel. It will obviously trim fuelling according to lambda value anyway.

  5. #5
    Regular Member Maverick's Avatar
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    The Vectra VXR's ECU is different to all other cars in the Vauxhall range. If you were to run a tank of Asda fuel, then go on to V-Power, then another V-Power and then another, the ECU will advance the ignition each time until it reach's it's ultimate settings.

    As soon as you put in another tank of Asda 95, the ECU will retard the ignition accordingly and you start all over again.

    All the other cars in the range, only have a learning curve to suit the driving style, the VXR is alot cleverer. It is best to get your map done with decent fuel in.

    Who is mapping it?

  6. #6
    Regular Member Netstar's Avatar
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    Thorney Motor Sport are doing the map.

    Thanks for your advice chaps, but i think my best option is to get a few gerry cans and make sure a got enough of the good stuff

  7. #7
    Regular Member shippers's Avatar
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    Default

    Correct me if im wrong but I thought fuel lost octane when stored for a while?
    I have run my mapped vxr on 95ron with no problem.

  8. #8
    Regular Member Sean-2.2Direct's Avatar
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    Quote Originally Posted by shippers View Post
    Correct me if im wrong but I thought fuel lost octane when stored for a while?
    I have run my mapped vxr on 95ron with no problem.

    It does mate thats correct read that some place my self

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