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  • DPF Statistics 0 - 50,000Km

    Here are some DPF stats for 0-50,000Km on my 2018 GXL Prado:
    ECU firmware updated early 2019.
    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 Between Regens V01.jpg Views:	0 Size:	14.9 KB ID:	749740
    Click image for larger version  Name:	Kms to complete a Regen V01.jpg Views:	0 Size:	16.3 KB ID:	749739


    Mileage Breakdown:
    a. ~18,000Kms on the open highway (100-110Kms/hr),.
    b. ~3,500Kms 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 = 250-300Km

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

    General:
    a . Economy1 = 8.5 Ltrs/100Km, city driving
    b . Economy2 = 12-13 Ltrs/100Km, highway driving (Wt ~3,050Kg max)
    c. Economy3 = 8.5 Ltrs/100Km, mixed driving, wheels Dunlop AT20, 265/65 R17 on Factory Alloy Rims
    d. Economy4 = 9.7 Ltrs/100Km, mixed driving, wheels Toyo ATII, 265/70 R17 Steel Rims


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

    Finally got the DPF Manual button Custom Mode enabled. I can pull over before driving over miles of tinder dry grass and manually initiate a burn whenever the DPF level is over 28%. And it works,
    RPP
    Senior Member
    Last edited by RPP; 18-01-2020, 08:43 AM.

  • #2
    Lucky you RPP. I reckon the DPF custom mode button is a placebo or dash ornament. My DPF appears to now work fine according to my Scan Gauge but the switch and custom mode does bugger all. I have sat in the car with the head tech bloke at the dealers with his laptop connected and he demonstrated that the switch DID work but that was the last time that it did! The way it was explained to me was that it would only work when ordinary dpf burns had failed and the dpf got to about 160(?) % per cent full. it has never gone beyond 100% according to the scan gauge at which point it burns. This is on a mid 2016 model with all of the updates done. 2019 models models which had the switch as standard may be different.

    Comment


    • #3
      As far as notes point a) I have found something different. A number of times my wife has used the vehicle and parked at home before a burn has completed. I have driven the vehicle and just under 2 km (with the engine not fully warm, coolant reading 60 on the scan gauge) the burn has initiated. I can recall it occurring at leat 3 times and it has always started at the same roundabout. I would always keep driving until the burn has completed. Mine also burns to 4%, - 0%.
      thanks for sharing the other info.

      Comment


      • #4
        Originally posted by Marvellous_matt View Post
        As far as notes point a) I have found something different. A number of times my wife has used the vehicle and parked at home before a burn has completed. I have driven the vehicle and just under 2 km (with the engine not fully warm, coolant reading 60 on the scan gauge) the burn has initiated. I can recall it occurring at leat 3 times and it has always started at the same roundabout. I would always keep driving until the burn has completed. Mine also burns to 4%, - 0%.
        thanks for sharing the other info.
        Hi Marvellous_matt:
        What I've observed is that the ECU will re-initiate an interrupted burn when the coolant temp climbs over 60C. The Custom Mode #1 display window shows the burn underway.
        However both the DPF temperature and % don't move for some time/kms. Eventually the 5th injector kicks in and the DPT temp climbs. When it climbs thru 500C the % starts to drop.

        Also, I had to hunt high and low to find a Toyota Dealer who had successfully enabled Custom Mode #2 - the DPF Manual Button. The Dealer I bought the car from had 4 goes before I called it quits and looked for another. Interestingly the manual button in this new Mode is a lot more useful on the 2.8l diesels (Prado, Hilux, Fortuner) than on the V8 Landcruiser 200 & 70s according to Toyota's booklet.

        Comment


        • #5
          Very informative as always. Thanks for sharing

          Comment


          • #6
            Originally posted by RPP View Post
            Here are some DPF stats for 0-50,000Km on my 2018 GXL Prado:
            ECU firmware updated early 2019.
            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 Between Regens V01.jpg Views:	0 Size:	14.9 KB ID:	749740
            Click image for larger version Name:	Kms to complete a Regen V01.jpg Views:	0 Size:	16.3 KB ID:	749739


            Mileage Breakdown:
            a. ~18,000Kms on the open highway (100-110Kms/hr),.
            b. ~3,500Kms 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 = 250-300Km

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

            General:
            a . Economy1 = 8.5 Ltrs/100Km, city driving
            b . Economy2 = 12-13 Ltrs/100Km, highway driving (Wt ~3,050Kg max)
            c. Economy3 = 8.5 Ltrs/100Km, mixed driving, wheels Dunlop AT20, 265/65 R17 on Factory Alloy Rims
            d. Economy4 = 9.7 Ltrs/100Km, mixed driving, wheels Toyo ATII, 265/70 R17 Steel Rims


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

            Finally got the DPF Manual button Custom Mode enabled. I can pull over before driving over miles of tinder dry grass and manually initiate a burn whenever the DPF level is over 28%. And it works,
            From the data you have provided yuor DPF is partially blocked. The low km's between burns at hwy speed is indicative of that.

            Thanks
            Doug
            2018 150 Series Crystal Pearl Prado VX 2.8l. 2 inch King springs and Bilstein shocks, Airtek TJM snorkel.

            Comment


            • #7
              Might be, however the ECU update (circa early 2019) changed the burn frequency for highway speeds, but not for city driving.
              You'll notice that before the ECU update the highway burn frequency was the same as for the city cycle, but it was taking significantly longer to complete the burn at highway speeds.
              I assume that the burn takes longer since it has to keep ahead of the soot generation process at 110Km/hr.

              I have the DPF tested every maintenance period, You can do it with Techstream, the pressure differential when the burn is complete is small.
              RPP
              Senior Member
              Last edited by RPP; 28-04-2020, 11:01 PM.

              Comment


              • #8
                Originally posted by RPP View Post
                Might be, however the ECU update (circa early 2019) changed the burn frequency for highway speeds, but not for city driving.
                You'll notice that before the ECU update the highway burn frequency was the same as for the city cycle, but it was taking significantly longer to complete the burn at highway speeds.
                I assume that the burn takes longer since it has to keep ahead of the soot generation process at 110Km/hr.

                I have the DPF tested every maintenance period, You can do it with Techstream, the pressure differential when the burn is complete is small.
                What parameter are you checking? Is it the Cat differential ?

                I can honestly say with a new DPF the burn is now occuring every 300+km. With the previous DPF and same ECU firmware it was doing it only at 120km to 150km. If you using the Cat Diff value are you seeing 0.05? Thats what the new DPF is showing once burn is complete it does go up as high as 0.18 when at 100%.

                Thanks
                Doug
                2018 150 Series Crystal Pearl Prado VX 2.8l. 2 inch King springs and Bilstein shocks, Airtek TJM snorkel.

                Comment


                • #9
                  Hi Cuda,
                  Haven't done any real highway runs since the middle of last year.
                  Subsequent city regens have been occurring between 280 - 360Km. The best at 367Km, most between 320s-mid340Kms.
                  The daily driving scenario is 52Km to work and back on the flat at 40-60-80Km/hr.

                  Completed a 8,500km trip to the Kimberley and back mid last year, just after the ECU upgrade was installed.
                  About 7,000Km at highway speeds (110-130Km/hr [in the NT]). The Prado loaded was 3.05t.
                  The DPF regens occurred at a much higher frequency on the highway, mostly around 150Kms, occasionally 200+Kms.
                  The Carson River Track trek was a 10 day 450Km hard grind in 4LO for days at a time, barely got over 20Km/hr in the early days. 2 DPF regens occurred at just over 200Kms each.
                  I'm fairly satisfied with the performance of the vehicle and DPF so far, and I have the manual button now working for those rare times.

                  However, on the remote track I saw a couple of glitches in fuel transfer from the sub-tank. Twice with the sub-tank level half down, the main tank level would begin to drop instead.
                  But overnight, or after startup in the morning - I wasn't paying attention, the system refilled the sub-tank from the main tank and the process behaved normally again.

                  The 60,000Km service is coming up soon, which might be the last before the warranty runs out.
                  I'll have another set of tests run, and an updated set of charts. Let me know if there are any specific measurements I should have done.

                  ty
                  Rolf

                  Comment


                  • #10
                    Could someone explain the difference between catalyst differential pressure and DPF differential pressure?
                    I ask because I am pretty sure that Doug quotes cat pressure (F*256+G)*0.001-32.768 and not DPF pressure (D*256+E)*0.01-327.68 I cant get my head around why the emphasis is on the catalyst when surely the filter is what we are interested in???
                    The DPF differential pressure (which I have rightly or wrongly always looked at) gives far higher figures. I found this on research gate dot net:

                    "Engine efficiency decreases with increasing backpressure due to thermodynamic reasons. The pressure drop of the DPF increases as it captures particulate matter from the engine. Depending on the DPF wall material, cell density, diameter and brick length, a clean DPF typically has a baseline pressure drop of 0.5-0.8 kPa. A rule of thumb is that the engine power will decrease by 1% for every 3-4 kPa increase in engine backpressure. Thus, engine OEMs tend to limit engine backpressure to approximately 1.5 psi (10 kPa)."

                    It continues to say:

                    "The DPF must be regenerated, continuously or intermittently. Continuous regeneration only occur when the exhaust gas temperature is higher than the soot-balancing temperature (SBT) for a significant fraction of time. This often requires high loading of PGM catalyst in the DPF washcoat. For non- or lightly catalyzed DPFs that typically operate below the SBT, active regeneration is required when the pressure drop exceeds a threshold, typically 5 to 7 kPa. To enable active regeneration event, the exhaust gas temperature must be raised to well above the SBT using extra heat generated either by the engine or by an auxiliary heat source. This, of course, consumes energy. Therefore, DPF regeneration, either active or passive, intermittent or continuous, comes with a fuel penalty.

                    The striking thing (at least for me) is this line:

                    "active regeneration is required when the pressure drop exceeds a threshold, typically 5 to 7 kPa."

                    This matches almost exactly what my torque pro figures show, as I mentioned I am neither near my Prado or Techstream so sorry that I cant do any monitoring to help.

                    Comment

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