Dpf Regeneration

[Daveyonthemove]

I've now owned my car for a month, and i'm really enjoying it so far.

I'm keeping a close eye on how it performs and the MPG etc, but one thing i know very little about is the DPF.

I have always been warned away from them in the past, but they are now becoming a common feature on new cars, so i had to bit the bullet one day and own a car with one fitted.

I have covered 1100+ miles in the last 4 weeks, and have not noticed anything different about the car to suggest a DPF regeneration.

No excess smoke (no smoke at all to be honest)

No strange sounds

No smell

Do they regenerate often and are there any obvious signs?

[OldSkoO1]

In these toyota's especially the T180's, they regenerate all the time.

Most diesel cars locate the DPF's to take heat from the turbo's and engine to try and burn as they go but also they have a major burn every 1-2,000 miles where you notice a significant heat rise, a sweet burning smell like burning sugar and a possible retardation in power.

With the toyota's there is a fifth injector which is active practically all the time burning off soot as you go at low volume but constant. This help's the toyota reach record low levels of nox. Wa hoo :/ So you don't notice it as it's nowhere near as aggressive, but more constant. You will see this if you put the MPG calculation on realtime. You will see it fall very briefly by about 10mpg and go back up again. On most cars MPG realtime will usually be a constant.

[Daveyonthemove]

Thanks for the feedback.

I've not experienced any smell yet, and i normally have the computer displaying 'Average consumption' rather live consumption.

That might explain why i got to 49.8mpg last night but couldn't quite get to 50 before it dropped to 47.8 overall.

[Daveyonthemove]

Thanks for the feedback.

I've not experienced any smell yet, and i normally have the computer displaying 'Average consumption' rather live consumption.

That might explain why i got to 49.8mpg last night but couldn't quite get to 50 before it dropped to 47.8 overall.

[Rick D4D]

Thanks for the feedback.

I've not experienced any smell yet, and i normally have the computer displaying 'Average consumption' rather live consumption.

That might explain why i got to 49.8mpg last night but couldn't quite get to 50 before it dropped to 47.8 overall.

Dave your fuelly does not make sense, it says the average price you pay per gallon is £4.64 but diesel is now around £1.20 per litre and if you multiply £1.20 x 4.54 to get a uk gallon it works out at £5.44 per gallon which is around 80p more than you pay.

[Daveyonthemove]

It might be 1.20 where you live, but i have been paying as much as 1.23

Since buying the car my refuels have been as follows:

46.80 litres at 120.9

44.93 litres at 123.9

20.01 litres at 120.9

30.63 litres at 122.9

28.50 litres at 122.9

All my figures in fuelly have been entered the same as the MPG app on my phone, and the totals all add up, so if the price per gallon is wrong, its probably an issue with the fuelly website.

To be honest, i don't worry about the cost per gallon as i buy it in litre quanities so haven't really looked at it in great detail.

The overall average is my main interest :)

[Daveyonthemove]

Also, i forgot to add that i recently had money off vouchers from Shell through the loyalty scheme, so that might affect the oeverall cost?

[acetip]

I've now owned my car for a month, and i'm really enjoying it so far.

I'm keeping a close eye on how it performs and the MPG etc, but one thing i know very little about is the DPF.

I have always been warned away from them in the past, but they are now becoming a common feature on new cars, so i had to bit the bullet one day and own a car with one fitted.

I have covered 1100+ miles in the last 4 weeks, and have not noticed anything different about the car to suggest a DPF regeneration.

No excess smoke (no smoke at all to be honest)

No strange sounds

No smell

Do they regenerate often and are there any obvious signs?

i know little about modern diesel.but undestand the two methods of keeping the dpf clean.but the method of using high temps to clean them by giving the engine a thrash up the road when a warning on the dashp prompts you to.if you fail to do this and and the dpf is damaged then its not covered under warrany you have a hefty bill.if yours is 5th injector although it may cost a bit in fuel, its automatic which cant be a bad thing.

[Daveyonthemove]

I've not had any light on the dash yet relating to the DPF, and most of my journeys are quite long (the shortest one being 25 miles usually) so i would imagine it would get plenty of time to burn off any carbon if it needs to.

It does sound like a better method of regeneration when compared to the VAG range, but MPG does appear to suffer for most people, although mine seems reasonable so i'm not complaining.

I'm not concerned about the DPF on this car, i just like to know when its behaving as it should do. :)

[OldSkoO1]

I wasn't aware of any car that has a recommended procedure to thrash the car when the DPF light comes.

My current diesel is a twin turbo auto so a lot of heat is generated by both turbos as i go and only really see a major burn every 2 or 4k miles. For a car that has an active burn at intervals and that is putting out 312bhp through the auto box it returns between 42 and 47mpg.

But when it does burn the autobox selects the gear below. So instead of going along at about 1.4k it sits at about 1.7-2k RPM which is max torque. What this does is create an abundance of heat because the engine is at max cylinder pressure. In the toyota's this isn't necessarily required as the 5th injector generates the heat for you. At the expense of fuel consumption.

However, driving at around 2-2.5k RPM every once in a while is only a good thing.

Interesting to know that you should be giving it a thrash. A sudden demand for power and revving up to the red line only serves to seat the piston rings as even on modern day fuel rails, overfueling occurs which leaves unburnt fuel in the chambers leading to an increase in soot.

[acetip]

I wasn't aware of any car that has a recommended procedure to thrash the car when the DPF light comes.

My current diesel is a twin turbo auto so a lot of heat is generated by both turbos as i go and only really see a major burn every 2 or 4k miles. For a car that has an active burn at intervals and that is putting out 312bhp through the auto box it returns between 42 and 47mpg.

But when it does burn the autobox selects the gear below. So instead of going along at about 1.4k it sits at about 1.7-2k RPM which is max torque. What this does is create an abundance of heat because the engine is at max cylinder pressure. In the toyota's this isn't necessarily required as the 5th injector generates the heat for you. At the expense of fuel consumption.

However, driving at around 2-2.5k RPM every once in a while is only a good thing.

Interesting to know that you should be giving it a thrash. A sudden demand for power and revving up to the red line only serves to seat the piston rings as even on modern day fuel rails, overfueling occurs which leaves unburnt fuel in the chambers leading to an increase in soot.

i dont think the prompt from a dash warning light to thrash (use the term lightly) applies to a toyota but to some other makes.yours does it automaticly,others dont.you got to burn soot from dpf by increasing temp as you said.

[Red diesel]

I wasn't aware of any car that has a recommended procedure to thrash the car when the DPF light comes.

My current diesel is a twin turbo auto so a lot of heat is generated by both turbos as i go and only really see a major burn every 2 or 4k miles. For a car that has an active burn at intervals and that is putting out 312bhp through the auto box it returns between 42 and 47mpg.

But when it does burn the autobox selects the gear below. So instead of going along at about 1.4k it sits at about 1.7-2k RPM which is max torque. What this does is create an abundance of heat because the engine is at max cylinder pressure. In the toyota's this isn't necessarily required as the 5th injector generates the heat for you. At the expense of fuel consumption.

However, driving at around 2-2.5k RPM every once in a while is only a good thing.

Interesting to know that you should be giving it a thrash. A sudden demand for power and revving up to the red line only serves to seat the piston rings as even on modern day fuel rails, overfueling occurs which leaves unburnt fuel in the chambers leading to an increase in soot.

312 bhp twin turbo automatic - interesting, mind if i ask what kind of car it is

Red diesel

[dervdave]

312 bhp twin turbo automatic - interesting, mind if i ask what kind of car it is

A remapped BMW 535d ?

[OldSkoO1]

It's a remapped BMW 335d but it's currently running a mild remap.

It's a bit of a nightmare in winter with winter tyres on, it just spins it's wheels and you can't use all of the power, even stock you can't use the power. Bit disappointing really.

But in summer, at the upper limit of the remap it will quite happily put out 350bhp think the torque figure from the dyno was like 700nm.

I know one bloke who removed his DPF and has a straight through pipe with his remap. Surprisingly it doesn't create much smoke. I have no idea if that's down to the heat produced or the fine fuel tolerance post remap but it's quite remarkable.