DPF burn

[TD5-90]

... Air flow is reduced, fuel injection volume is increased and the injection timing is retarded - all to increase the exhaust gas temperature to around 500 degrees C. That high heat load is probably why we're seeing the cooling fans operating at high speed (and noise!). I had also noticed via the off-road page but never understood why until now, that the engine oil temperature increases about 10 degrees C during a burn. The engine is forced to run hot when a regeneration is occurring and the oil temp rises as a result.

Watched a DPF burn cycle today via OBDlink, saw exhaust gas temps in excess of 670°C.
Apart form egine oil temp going to up to 110°C, also transfer case temp increases substantially. Likely a result of the massive heat flow under the vehicle & radiation from exhaust piping...

 

[Clark Kent]

Watched a DPF burn cycle today via OBDlink, saw exhaust gas temps in excess of 670°C.
Apart form egine oil temp going to up to 110°C, also transfer case temp increases substantially. Likely a result of the massive heat flow under the vehicle & radiation from exhaust piping...

That's hot. The transfer case rise is interesting. Another justification for the cooler perhaps.

 

[matt_grenadier]

My god, i have my grenadier for a week now, and just experienced helicopter mode today on a public parking. Embarassing it kept making this awful noise for 6 min+ when the engine was off.

Imagine going camping, and parking next to someones tent at night and the grenny decides to go in helicopter mode...

Just another inconvinience to add to the list i guess.

 

[Eric]

My god, i have my grenadier for a week now, and just experienced helicopter mode today on a public parking. Embarassing it kept making this awful noise for 6 min+ when the engine was off.

Imagine going camping, and parking next to someones tent at night and the grenny decides to go in helicopter mode...

Just another inconvinience to add to the list i guess.

It gets even more embarrassing if the adjacent car owners move away and call the fire brigade, thinking it is going to self combust

 

[Skydance]

My god, i have my grenadier for a week now, and just experienced helicopter mode today on a public parking. Embarassing it kept making this awful noise for 6 min+ when the engine was off.

Imagine going camping, and parking next to someones tent at night and the grenny decides to go in helicopter mode...

Just another inconvinience to add to the list i guess.

Well at least fingers crossed won’t have any DPF issues in the future as helicopter mode frequently burns off all the crap. Helicopter mode happens more often in traffic and if you keep it below 3000 rpm regularly. Need to give it the beans every so often.

 

[Skydance]

I

It gets even more embarrassing if the adjacent car owners move away and call the fire brigade, thinking it is going to self combust

Imagine taking kids to school prom and this happens.

 

[matt_grenadier]

Well at least fingers crossed won’t have any DPF issues in the future as helicopter mode frequently burns off all the crap. Helicopter mode happens more often in traffic and if you keep it below 3000 rpm regularly. Need to give it the beans every so often.

I drive pretty slow most of the time keeping it between 1200 and 2000 rpm. I find it very soothing cruising at these sweet rpms. Ofcourse sometimes i find it nice to have the power available.

 

[matt_grenadier]

I

Imagine taking kids to school prom and this happens.

Imagine your grenadier is selected to be the wedding vehicle of your best friend. You park the car in front of the church, turn off the car, and the grenny decides to go in helicopter mode.

 

[Cheshire cat]

Mine seems to do it less these days. (2 years / 20,000 miles.)
My daughter was so embarrassed by it, she stopped using it to see her friends.