akp303 wrote: ↑
Wed Oct 03, 2018 11:50 am
NoDiscoSport wrote: ↑
Wed Oct 03, 2018 11:20 am
The dilution problem is commonly misunderstood as a consequence of short journeys. That's convenient for JLR because it diverts attention away from the disclosures in JLRP00100. The following post from a year ago addresses a much wider problem because that was how I drove my DS (60-70 mph in top gear) and my dilution was about 1% for every 1000 miles. I think the dealer being quoted had a very good understanding of the problem.
What are the disclosures in JLRP00100?
So does this mean that the engine is not getting hot enough ever to have the DPF regenerated? If so, is there a known optimum temperature for this to work?
I will do a bit more research on this before deciding. Honestly, if I read this thread prior I wouldn't have placed the order...too much of work even to be sure about the reliability.
Because the inlet doesn't reach the required temperature (280 to 300 deg C) during normal driving the DPF is unable to regenerate passively on the Ingenium DS (letter from JLR, 24 October 2017). Furthermore, they said that the normal driving pattern required to keep the DPF clean must include some drives of over an hour.
Active regenerations are the only means of clearing soot from the DPF and these are required every 180 to 560 miles according to JLR's official response on the honestjohn website. In my experience (including photographs of OBD) a DS being driven regularly at 60-70mph performed an active regeneration every 203 miles.
The temperature required at the DPF inlet for active regeneration to occur is 580 to 600 deg C. This temperature must be maintained by post injection of diesel into the engine cylinders for periods of up to 45 minutes. That's only my calculation but it doesn't take a rocket scientist to link the DPF regeneration time with JLR's insistence that there are some drives of "over an hour" in a normal driving mix.
These, to the best of my knowledge, are the numbers that are required to make full sense of the text of JLRP00100
PS.: On this exhaust the DPF monolith has a selective catalytic reductive coating to facilitate NOx after treatment. Any references to the SCRF should therefore be taken to include DPF and vice versa.
PPS.: All these points have been made further up the thread complete with supporting evidence, i.e. clips of letter from JLR, photos, etc. If you need a specific piece of documentary evidence feel free to send me a PM
17MY DS150PS 6 speed manual. Rejected as "not of satisfactory quality", "not as described", Consumer Rights Act 2015.