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SootScout



Member Since: 08 Oct 2024
Location: London
Posts: 1

United Kingdom 
The DPF is not fit for purpose on Land Rover Discovery Sport

Hi all,

Another DPF nerd here.

While I am not a Range Rover owner, the DPF on my Land Rover Discovery Sport 2017 got blocked and had to be replaced, a problem that seems to be affecting many of us.

I found out there was a class action lawsuit against Land Rover for faulty DPF construction, and I wanted to get proof of whether my car was also affected.

(There is further information about the fault presented in this document).

Using the Car Scanner app, I recorded over 200 trips in and outside of the UK and put all the recordings up on a website: https://sootscout.com

It is still a work in progress (I need to do further detailed analysis on my trips); however, I believe it already provides valuable insights for anyone who wants to understand how the DPF works.

I've attached a photo of the first recorded trip, which immediately showed that the DPF could not regenerate itself during normal driving conditions on the motorway. Notice how the soot mass keeps increasing despite driving on the motorway. Only an active regeneration at the end of the trip could clear the soot.



In contrast, here is another trip recorded on the German Autobahn with speeds well exceeding 80 mph. Interestingly, the DPF is working as designed here.



Could this mean that the "faulty" DPFs were designed to be used outside the UK, where speed limits are higher...?

You can explore the data further on the website.

If you are affected by the same issue, I hope you find the information on the site useful.

Cheers

Post #701763 8th Oct 2024 10:41am
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Kot



Member Since: 10 Mar 2021
Location: broadland
Posts: 1215

United Kingdom 

The whole idea of DPF regeneration is explained in the WS manual below, and your first graph shows passive regeneration over 250C at limited events not easy to achieve constant PRegen below 70mph. As soot load/mileage increases, you meet the trigger point for an active Regeneration, which could be average mileage of your ARegens or grams of soot limit is achieved.
https://www.fullfatrr.com/gallery/albums/u...ration.pdf

The 2nd graph shows passive Regen all journey, as you are exceeding 250C, and averaging 300 to 500C so passive Regen is working well, no need for Active Regen to start.

So both graphs actually show your Regen system's algorithm is working as design.

However the mechanical design could be better, the architecture is not helping and is contributing to fuel dilution of the oil. Below is a JLR memo on this matter.https://www.fullfatrr.com/gallery/albums/u...lained.pdf

Point 7 is where they say "its your driving style Sir" 2018 SE SDV8 4.4 Byron Blue

Post #701794 8th Oct 2024 5:14pm
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