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Thread: Recalibrating BC for MPG etc?

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    Default Recalibrating BC for MPG etc?

    I noticed my BC is a bit over-optimistic about my fuel economy and seems to think I'm using less fuel than I actually am (comparing "fuel used" on the BC to the amount put in doing a brim to brim fill)

    Is it possible to re-calibrate the BC, or if I run the tank really low will it learn?

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    Full Member Caveman_nige's Avatar
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    You could ask your dealer for you car to have the latest software installed. I did this a couple of years ago.
    My old Signum, the animal; she now rests in pieces in several other members cars.. https://www.vectra-c.com/forum/garag...vehicle&id=200
    The wifes vec show car, started as a standard daily driver and ended up like this. https://www.vectra-c.com/forum/garag...vehicle&id=709



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    Regular Member Ziggy's Avatar
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    Are you running a tuning box?

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    Quote Originally Posted by Caveman_nige View Post
    You could ask your dealer for you car to have the latest software installed. I did this a couple of years ago.
    Is the latest software better than the previous version?
    What i mean is, is it worth getting it updated? Will i notice any difference?
    I assume vx will charge for it!

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    Quote Originally Posted by DHobbs View Post
    Is the latest software better than the previous version?
    What i mean is, is it worth getting it updated? Will i notice any difference?
    I assume vx will charge for it!


    Saved me typing that lot

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    Quote Originally Posted by s_zigmond View Post
    Are you running a tuning box?

    Nope, it has an Angel Tuning remap though. I asked them and they said nothing on the remap would alter MPG readings.

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    Regular Member rich r's Avatar
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    I'm fairly sure that the BC only has calibrations for the standard engines in standard tune, so you can tell it you've got a 1.8 or a 3.2, but you can't tell it that it's now injecting more fuel than it was before. It monitors the fuel injector signals to know how long they're open for, then uses a lookup table to derive how much fuel it's using per minute.

    As you've changed the fuelling map, it doesn't match up with what the BC any more.

    I have a similar issue in that my Vectra is a Dual Fuel one. I'd like to recalibrate my BC so it more accurately reflects the LPG fuel consumption. But as it's triggered off the petrol injectors, it's quite a bit out when running on LPG (as the LPG injectors inject a different amount of fuel).

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    It knows how much fuel it's injecting from the injection duration - the new map will inject more fuel by increasing the injection duration - so the BC should know that.

    If the fuel pressure had been changed it would be injecting more fuel than the BC thinks it is - but Angel Tuning have confirmed there's nothing changed in the remap that should affect the BC

    I wasn't sure if Tech 2 or whatever could *adjust* the fuel usage/fuel used counter to correct.

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    Regular Member rich r's Avatar
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    I don't think you can in Tech2, no, just change the engine size/type from a fixed list.

    But yes, you'd think that if you hadn't changed the fuel pressure it should be no different to how it was before the remap.

    Mind you - I haven't yet seem a fuel computer that's better than 95% accurate on any vehicle. I tend to just leave it showing average consumption and just aim to keep the number as high as possible, rather than equate it to actual amount of fuel I'm putting in the tank.

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    Quote Originally Posted by rich r View Post
    I tend to just leave it showing average consumption and just aim to keep the number as high as possible, rather than equate it to actual amount of fuel I'm putting in the tank.

    That's not a bad way of looking at it!

    My Vectra B used to be really good at average MPG and range remaining, so it was quite useful for knowing when I needed to fuel up.

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