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Fuel Computer MkV 2.0TDI innacurate ?

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  • #16
    Originally posted by cetane View Post
    We all know that the speedo is optimistic by ~10%. So if the speedo is optimistic then won't the odo also be optimistic? Which means that you're actually covering less kms than you think (by 10%?) and so your fuel consumption will look less by ~10%.

    Check out my logic, guys, it could be flawed.
    Hey Cetane,

    I checked that out against the numerous speedo checks around where the roads depts in each state have 5km stretches measured out. My Odometer appears to be out by approx 50 metres in 5 km so not an appreciable error. Surely NSW, VIC and SA all can't be wrong!

    I know the speedo reads under as most people on freeways seem to zip past. The wife though does most of the driving around town and she ain't light footed.
    BeigeJet
    White MY23 Tiguan 147 TDI Elegance (mine)
    White MY21 Tiguan 147 TDI Elegance (wife)
    Gone - Wheat Beige MY07 Jetta TDI manual

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    • #17
      Originally posted by Logzy View Post
      The speedo, no you cant adjust it but you can adjust the consumption in the mfd.

      Im in the process of adjusting mine at the moment. So far ive made one adjustment but it requires more.
      Geez, I feel like a dunce, how'd you get so smart with Vag-com? Let us know the tweak mate!
      2014 Skoda Yeti TDI Outdoor 4x4 | Audi Q3 CFGC repower | Darkside tune and Race Cams | Darkside dump pDPF | Wagner Comp IC | Snow Water Meth | Bilstein B6 H&R springs | Rays Homura 2x7 18 x 8" 255 Potenza Sports | Golf R subframe | Superpro sways and bushings | 034 engine mounts | MK6 GTI brakes |

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      • #18
        Gps

        Originally posted by BeigeJet View Post
        Hey Cetane,

        I checked that out against the numerous speedo checks around where the roads depts in each state have 5km stretches measured out. My Odometer appears to be out by approx 50 metres in 5 km so not an appreciable error. Surely NSW, VIC and SA all can't be wrong!

        I know the speedo reads under as most people on freeways seem to zip past. The wife though does most of the driving around town and she ain't light footed.
        I'm going by GPS speed readings. Assuming they don't lie, there is a consistent 10% error in the speedo readout.

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        • #19
          Hi Jackafrica, You failed to mention that your golf has the plug and play tune? Maybe something going on there if it blows a lot of soot out the back mate?
          Cheers, Andrew
          Par 6 Golf GTI. Coilovers, BBS CH Wheels, APR'd
          Caddy van 05/07 (colourcoded) (BRIGHT! orange!) coilovers, Konis 18in. wheels, Oettinger tuned

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          • #20
            Originally posted by cetane View Post
            We all know that the speedo is optimistic by ~10%. So if the speedo is optimistic then won't the odo also be optimistic? Which means that you're actually covering less kms than you think (by 10%?) and so your fuel consumption will look less by ~10%.

            Check out my logic, guys, it could be flawed.
            My experience (my version of reality ? ) is slightly different in one aspect.

            IIRC, for various reasons (as discussed in previous posts) VAG typically design their vehicles to display optimistic road speed (usually 5-10% fast), low fuel consumption (anything up to 20% optimistic), but their odometers are much more accurate (possibly something to do with law suits re warranty in the good ol' USA).

            If the odometers were also 10% out then the fuel consmption would be even further out (ie 10% more), as we use the odometer (or trip) reading to calculate fuel used for distance travelled. Unless we have some other way of calculating distance we have to rely on the odometer for the distance. Thankfully I haven't heard of anyone with a particularly inaccurate odometer.

            I've read numerous posts that show you a way to display a more accurate speed via a special function in the climatronic controls, so if you have that fitted it might give you a good idea of just how optimistic your speed is. You have to press various buttons in special ways to access it, and I can't recall just what it is (do a search on climatronic in the various VW forums and I'm sure you'll find it).
            Last edited by gregozedobe; 04-07-2008, 09:23 AM.
            2017 MY18 Golf R 7.5 Wolfsburg wagon (boring white) delivered 21 Sep 2017, 2008 Octavia vRS wagon 2.0 TFSI 6M (bright yellow), 2006 T5 Transporter van 2.5 TDI 6M (gone but not forgotten).

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            • #21
              I also keep a detailed record of every fuel fill-up in a spreadsheet.
              The MFD average for the tank is pretty much spot on every time (TDi Pacific).
              The worst it’s ever been is 0.1 l/100km out (fractionally optimistic).

              I have also checked the Speedo with a GPS and found it consistently reads about 8-9% lower than the GPS. I’ve found the odometer matches the GPS exactly over a 250k trip.

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              • #22
                Originally posted by gtimk5 View Post
                Hi Jackafrica, You failed to mention that your golf has the plug and play tune? Maybe something going on there if it blows a lot of soot out the back mate?
                Cheers, Andrew
                Hi Andrew,
                Smokes with or without the plug and play when you put the foot down. Not all the time though, which for me is the confusing part. No doubt it is a diesel trait or something explainable.

                Cheers
                Richard

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                • #23
                  Hi Richard + Readers,

                  I am a new owner of a 1.9TDI VW Jetta 2010 model.
                  I too am keeping detailed records on what the MFD displays for average fuel consumption of each refill V's manual calculation of litres / km's *100.
                  There is a considerable difference, I have only recently written to VWA directly. I hope to have this rectified.

                  I would love to hear from others about their experiences.

                  Thanks,
                  Simon.

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                  • #24
                    Wow, someone dug up this thread! Last post was 2 years ago .

                    The MFD is really just a toy that helps you keep your foot out of it and drive more efficiently. I dont see why it ought to be 100% accurate, as you have a fuel gauge anyway. I doubt that having the MFD read optimistically is a big conspiracy on the part of VW either - only the foolish would ignore a real world calculation often easily done in your head after you fill up against a dashboard gimmick.

                    Good luck with your application with VWA to have the problem "rectified".
                    '07 Touareg V6 TDI with air suspension
                    '98 Mk3 Cabriolet 2.0 8V
                    '99 A4 Quattro 1.8T

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                    • #25
                      a variation of 20% is a fault.

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                      • #26
                        For those with an iphone, have a look at Road Trip Lite. You punch in cost/L, number of liters and the Odo. Gives cost and milage with a little graph to compare different fills. And its free.
                        2010 Passat Highline/DSG/Reflex Silver/Black Napa Leather/Bluetooth/Tint

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                        • #27
                          [QUOTE=gldgti;
                          Wow, someone dug up this thread! Last post was 2 years ago .

                          The MFD is really just a toy that helps you keep your foot out of it and drive more efficiently. I dont see why it ought to be 100% accurate, as you have a fuel gauge anyway. I doubt that having the MFD read optimistically is a big conspiracy on the part of VW either - only the foolish would ignore a real world calculation often easily done in your head after you fill up against a dashboard gimmick.

                          Good luck with your application with VWA to have the problem "rectified".

                          I think people would like to see their investments treated by VWA a little more seriously than that
                          We keep a pocket calculator in the door and do our own fuel efficiency calcs. Around town 6.6 so far, and country as low as 5.1 from memory.
                          i dont keep records, but maybe we should.
                          MY09 Golf Candy White 2.0 TDI Pacific
                          MY95 Golf III TDI

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                          • #28
                            Well unless you precisely measure the fuel that you put in the tank, you can't prove that MFD is inacurate? I know for sure that the pumps are not accurate!
                            Performance Tunes from $850
                            Wrecking RS OCTAVIA 2 Link

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                            • #29
                              So what is the allowable variation by Trade Practices or Consumer Affairs, Fair Trading in Qld or ACA, for that matter?
                              Surely nothing like the ten or twenty percent variation above?
                              MY09 Golf Candy White 2.0 TDI Pacific
                              MY95 Golf III TDI

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                              • #30
                                Holy cow.

                                If the door falls off, if the seatbelt doesnt lock, if the brakes fail, if the engine runs away - all these things are valid concerns. If you are deeply troubled about your instantaneous fuel consumption readout being 5l/100km instead of 6, you might think about some of the things those less fortunate than ourselves have to deal with every day - like finding their next meal, clean water or trying not to get killed. For crying out loud...

                                Thread closed.
                                '07 Touareg V6 TDI with air suspension
                                '98 Mk3 Cabriolet 2.0 8V
                                '99 A4 Quattro 1.8T

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