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  • DPF Statistics 0 - 60,000Km

    DPF stats after 0-60,000Km on my 2018 GXL Prado:
    ECU firmware updated early 2019. Both Custom Modes enabled.
    Kerb Mass ex driver approx 2,700Kg.
    Accessories include GVM Upgrade, Bull-bar, Winch, Twin Wheel Carrier, Drawer System, UHF, Spot Lights, Dual Battery, Tools etc.


    Click image for larger version  Name:	Kms to Regen 0-60000.jpg Views:	0 Size:	16.5 KB ID:	752963
    Click image for larger version  Name:	Kms between Regen 0-60000.jpg Views:	0 Size:	15.5 KB ID:	752964


    Mileage Breakdown:
    a. ~22,000Kms open highway (100-110Kms/hr),.
    b. ~4,200Kms tracks, sand dunes, corrugations, mountains etc
    c. The rest city driving.

    DPF regens at highway speeds (post ECU update):
    Ave Kms to complete a regen = 30+Kms
    Ave Kms between regen = ~150Kms
    Regens often ended at 4% and some at 0%

    DPF regens for city driving:
    Kms to complete a full regen = less than 20Kms
    Kms between regens = 250-350Km

    Regens on remote tracks (5-10-20Kms/hr):
    Kms to complete a full regen = 2-5Kms

    Fuel economy scenarios:
    a . City driving = 8.5 Ltrs/100Km
    b . Highway driving (Wt ~3,050Kg max) = 12-13 Ltrs/100Km,
    c. On Dunlop AT20 265/65 R17 on Factory Alloy Rims = 8.5 Ltrs/100Km, city driving
    d. On Toyo AT II, 265/70 R17 Steel Rims = 9.7 Ltrs/100Km, city driving

    Notes:
    a. trips < 5-8Km won't produce the conditions for the DPF to start a burn. This is how long it takes to warm the system up before a regen will start/resume.
    b. 5 DPF burns during 5-10-20Km/hr grinding over sand dunes and remote tracks.
    c. 2019 ECU update significantly reduced the Kms between regens at highway speeds, and significantly reduced the time to complete a regen.
    d. DPF burn quits at 8% saturation, the residual heat energy carries the burn to 6%, and sometimes 4% or all the way to 0%.

    DPF Manual button has Custom Mode enabled. I can manually initiate a burn when the DPF level is over 28% before driving over dry grass. And it works!
    Last edited by RPP; 02-08-2020, 11:14 AM.

  • #2
    Thanks RPP, some very interesting info there - thanks for sharing!

    It's interesting that the regeneration is now performed more often for highway driving. I guess because that is a more optimal situation to do so, so the Prado is taking every chance it has to do it. It doesn't really want to do the burn at city speeds, so waits longer there, hoping you're going to go for a highway drive.

    Did you get Toyota to install the manual DPF button for you? Was it hard to convince them to install?

    How are you measuring the DPF saturation, ScanGauge?

    Comment


    • #3
      Originally posted by Grinbot View Post
      Thanks RPP, some very interesting info there - thanks for sharing!

      It's interesting that the regeneration is now performed more often for highway driving. I guess because that is a more optimal situation to do so, so the Prado is taking every chance it has to do it. It doesn't really want to do the burn at city speeds, so waits longer there, hoping you're going to go for a highway drive.

      Did you get Toyota to install the manual DPF button for you? Was it hard to convince them to install?

      How are you measuring the DPF saturation, ScanGauge?
      Ahoy Grinbot,

      Pre ECU update it was taking 70-90Kms to do a burn at highway speeds. One time it took over 100Kms.
      My guess is that at highway speeds the DPF burn was struggling to keep ahead of the sooting-up process.
      Post ECU update it happens more often and therefor much faster.

      I asked my Dealer to retrofit the manual DPF button last year.
      They had to send a formal request, with the usual rationale, to Toyota Australia as it is a configuration change under warranty.
      It was all done for free tho.
      However my Dealer couldn't get Custom Mode to work after 4 attempts.
      I found another Dealer who got it to work first go.

      Yes, I monitor the DPF% and DPF burn temperature on ScanGauge.

      Comment


      • #4
        Custom mode on mine flashes the dash light as it should but the switch has NEVER worked since they installed it on my 2016. Around the city about 270 km between burns appears to be the norm. Just back from trip to SW QLD towing about 1.2- 1.3 camper on a lot of dirt/ mud as well as long tar sections. DPF burns are much more frequently and take MUCH longer. Cruised at about 95kpm ish/ 2700-280 rpm in 4th gear.Under these conditions the scanguage showed the DPF falling at rates as low as 1% PER KM..I found that slotting it into 5th gear for a few km saw it fall rapidly as rpm was down to 2100- 2200rpm. Entry into a town saw it plummet within a km or so.
        On the plus side, switch ornament aside , the DPF appears to work well. I agree with your theory that at high rpm and loads the DPF can't clear as fast as it clogs. God only knows how those without the flashing light and with the non functioning switch and without a scanguage get on. If you can see what is happening you can manage it but you shouldn't have to.
        Towing at 2500 kg in 4thgear all day must really put a strain on the DPF and you can see how they fail.Moral: get a well set up scanguage to monitor the DPF.
        Interestingly running as above in 4th saw both the transmission temps in the low 90 deg range compared to temps at or below engine temp (84-85 deg). around town.Changing to S5 SAW the 2 transmission temps climb to 110 deg plus within a few km. Sump andgearbox guard may be playing a part but it shows why Toyota says to tow in 4th. The motor easily tows at 100kph in 5th but the transmission gets too hot for my liking. Perhaps it would be easier to have no mechanical sympathy and to be ignorant of what is going on!

        Comment


        • #5
          Originally posted by 404pug View Post
          Custom mode on mine flashes the dash light as it should but the switch has NEVER worked since they installed it on my 2016. Around the city about 270 km between burns appears to be the norm. Just back from trip to SW QLD towing about 1.2- 1.3 camper on a lot of dirt/ mud as well as long tar sections. DPF burns are much more frequently and take MUCH longer.
          There are 2 different Custom Mode(s). the 1st - which when enabled indicates on the dash when a DPF regen is underway, Mine displays a message but the older 150's just flash the icon.
          The 2nd - which when enabled for the DPF manual button, will allow the driver to initiate a burn when the DPF > 28%. On starting the engine the dash will display a message for a few seconds when the DPF > 28% that the button is ready for use.

          To get the 2nd Custom Mode enabled I had to hunt for a Dealer who had done it successfully before. My usual Dealer had 4 goes without success.

          And ignorance is also truly bliss. I have many work colleagues with late model 150's. They are oblivious to the workings of their vehicles and don't give it a moment of thought.
          Last edited by RPP; 19-08-2020, 02:26 PM.

          Comment


          • #6
            Well well. DPF burn done and dusted in just 7 km all the way to zero. Done at 60kph. A strange beast.

            Comment


            • #7
              Well spotted.
              The regen seems to take a nominal amount of time (at non-highway speeds), maybe around 20mins.
              Grinding along on tracks in low range at10-15kph I've had regens take about 2kms to complete.
              Slow suburban driving in heavy traffic 6-8kms.

              If you watch the DPF temp gauge on a Scangauge you will see that the regen ceases at 8%.
              However there is still significant residual heat energy in the DPF (ie around 650C).
              The residual heat continues the burn to 6%.
              When driving at slow speeds the residual heat dies off slowly and at times can continue the regen down to 4%, 2% and occasionally 0%.



              Comment


              • #8
                Yep. I have seen that on the scanguage. So they have the urban part sorted. Not so sure about high speed high load as I mentioned above.

                Comment

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