Smoky D4?

**Ferret** · 19th October 2011, 05:50 PM

Originally Posted by isuzurover

Do they have a DPF fitted? Surely a DPF clean wouldn't be initiated while driving in stop-start traffic in cold weather?

Can I have and explanation what 'DPF' means. Why it needs cleaning and under what conditions a clean might be initiated. Just wondering cause I own a D4 and don't understand what your talking about.

**isuzurover** · 19th October 2011, 05:54 PM

Originally Posted by Ferret

Can I have and explanation what 'DPF' means. Why it needs cleaning and under what conditions a clean might be initiated. Just wondering cause I own a D4 and don't understand what your talking about.

[ame="http://en.wikipedia.org/wiki/Diesel_particulate_filter"]Diesel particulate filter - Wikipedia, the free encyclopedia[/ame]

**Graeme** · 19th October 2011, 06:07 PM

LR produced enough 3.0s initially to satisfy volume requirements for EU5 approval. I can't remember the actual numbers rquired but it meant several weeks of production all 3.0s were all fitted with a DPF.

**roamer** · 19th October 2011, 09:24 PM

Mine has a PDF, and has come on twice in 2yrs, message on screen to not stop but didn't noticed any clouds of smoke behind and did look for it
Wonder if I will pay less Carbon Tax

Cheers Ken

**Graeme** · 19th October 2011, 09:45 PM

Originally Posted by roamer

Wonder if I will pay less Carbon Tax

Pay more tax because of the extra fuel injected to cause after-burning in the catalytic converter to get the DPF hot enough burn the particulates!

**Celtoid** · 19th October 2011, 10:05 PM

Originally Posted by Graeme

Pay more tax because of the extra fuel injected to cause after-burning in the catalytic converter to get the DPF hot enough burn the particulates!

Only if you weren't planning to stop for 20 minutes....LOL!!!

**Celtoid** · 28th October 2011, 03:35 PM

Originally Posted by Graeme

LR produced enough 3.0s initially to satisfy volume requirements for EU5 approval. I can't remember the actual numbers rquired but it meant several weeks of production all 3.0s were all fitted with a DPF.

So does the DPF affect the performance of the vehicle in any way?

**isuzurover** · 28th October 2011, 04:04 PM

Originally Posted by Celtoid

So does the DPF affect the performance of the vehicle in any way?

A DPF has a pressure differential (pressure drop) of exhaust gas across it. So it will use enegy forcing gas across it that could otherwise be harnessed for propulsion.

So in short - yes, performance will be reduced by a small amount (all else being equal), however I expect manufacturers would adjust tuning to compensate.

Graeme - what is this "volume requirement" you speak of???

**Graeme** · 28th October 2011, 05:34 PM

From what I read in the pre-release and early release documentation, LR needed to produce a specific number of 3.0 DPF-fitted vehicles to meet EU5 certification criteria. My guess is that a small percentage of those vehicles would then be chosen at random to be tested, but perhaps they were all tested.

Apart from presenting some additional back pressure, if a DPF needs to be cleaned then more fuel is injected to cause the catalytic converter to reach its maximum temperature, therefore more fuel can be used. However my desire to avoid having a DPF is for 2 other reasons. Firstly I want to keep the exhaust as cool as possible to avoid setting fire to grass and stubble and secondly I prefer not to have additional sensors and wires under the vehicle if they really don't serve a good purpose for me - more to go wrong.

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