DPF Statistics 0 - 80,000km

[RPP Senior Member Find all posts View Profile Close RPP]

DPF stats after 80,000Km on my 2018 GXL Prado:
ECU firmware updated early 2019. Both Custom Modes enabled. New DPF installed at 80,000 service (didn't want it, but got it anyway).
Kerb Mass ex driver approx 2,800Kg.
Accessories include GVM Upgrade, Bull-bar, Winch, Twin Wheel Carrier, Drawer System, UHF, Spot Lights, Dual Battery, Roof Rack, Water Tank, Spares, Tools etc.




Mileage Breakdown:
a. ~32,000Kms open highway (100-110Kms/hr),.
b. ~6,500Kms tracks, sand dunes, corrugations, mountains etc
c. The rest city driving.
d. Average economy after 80,000km = 9.7L/100Km

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, tyres & rims:
a . City driving = 8.6 Ltrs/100Km
b . Highway driving (Wt ~3,050Kg max) = 12-13 L/100Km,
c. On Dunlop AT20 265/65 R17 = 8.5 L/100Km, city driving
d. On Toyo AT II, 265/70 R17 = 9.7 L/100Km, city driving
e. On Toyo RT, 265/70 R17 > 10 L/100Km, city driving
f. factory alloy rims weigh about the same as steel rims but cost 15x more!
g. tyre weights (the rubber): Dunlop AT20 265/65 R17 = 16.5Kg, Toyo AT II 265/70 R17 = 22.1Kg, Toyo RT 265/70 R17 = 25.5Kg

Notes:
a. trips < 5-8Km won't produce the conditions for the DPF to start a burn in winter. This is how long it takes to warm the system to start/resume a regen.
b. 7 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%, 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 miles of dry grass. It works.

[watsea Member Find all posts View Profile Close watsea]

Interesting data and observations. Thanks RPP.

Today while doing some highway towing with our van, I deduced that while a DPF burn was occurring my fuel usage during the burn seems to be about 12-15% higher than normal operating without a burn.

As per the posts in another thread about EGTs, (GeeWhizz has posted really good information on EGTs and DPF burns) very recently I have able to detect when a burn is occurring by the EGTs of Sensors 2 and 3. While the burns occur, instantaneous fuel usage as observed on the vehicle's runs higher than when without a burn occurring. Obviously the 5th injector is using the extra fuel for the DPF.

I haven't done any observations yet with known correlation of DPF burns while highway driving without a large load. Though previously, I have done a number of similar highway trips with fuel usage being good while others, for no apparent reason, had higher fuel usage. Since now knowing a mechanism for identifying a burn, I am hoping to satisfy myself that DPF burns are the reason.

Anyone else observed, how fuel usage is affected during a DPF burn?

[RPP Senior Member Find all posts View Profile Close RPP]

Hi watsea,
clearly fuel is being supplied by the 5th injector to raise the temperature at the DPF to mid 500C and to well over 600C. High enough to melt aluminium.
When I'm paying attention I see around 1L/100Km increase in fuel consumption during a DPF burn.
The variability of fuel consumption on highway runs can be inexplicable. For example, I find the 300Km drive from Adelaide to Pt Augusta results in noticeably lower economy than the run back - every time. Its like driving uphill one way and down hill the other.

[watsea Member Find all posts View Profile Close watsea]

RPP,
that 1L/100km is typically variance that I get for the vehicle.that is lightly loaded, say 2 people and 70-100kg of gear. So that is about 12%.
Your Adelaide to Port Augusta trip and return might be wind affected. Whenever we have been in that area during Summer, most of the wind encountered by us had a component of Southerly wind involved.