So I am about to make the jump from a D3 TDV6, to a FFRR 4.4 SDV8.
Beginning to plan ahead. Does the 4.4 SDV8 have EGR valves ? Or do they have some other system.
If they do have EGR, presumably they can be blanked and remapped as per D3.

I read that on buying a 4.4, I should change both diff oils, and the gearbox oil. Any other things a part from usual service items. Thinking of mileage hopefully less than 80k.

If it’s an SDV8 it’s “relatively” modern and as such you can’t blank the EGRs as it would be illegal and would leave you with an EML, which would lead to an MOT failure.
As for the oils, that depends on the mileage and service history, but is no doubt worth doing.
My car is 6 years old, 58,000 miles and I have changed all the oils and fluids.

I believe the problem with blanking EGR valves on engines with DPFs, is that the EGR valves are used to regulate the very high temperatures that are used to perform the regeneration of the DPF.

So, whilst the EGRs could be physically blanked and the indicators on the dash could likely be coded out via software, you'd still end up with problems with the DPF. Kev

2014 L405 RR Vogue SE 4.4 SDV8 in Corris Grey
2010 L320 RRS HSE 3.0 TDV6 in Stornoway Grey

104,000 miles on my 2017 SDV8 and not a single issue with the EGR valves to date 👍

Changing diff oils is a standard part of one of the scheduled services and a gearbox oil change at around 70,000 is a great idea.

Tailgate cables are nowhere near as robust as those on the Disco and 80,000 miles of regular work use will see them snap but, apart from that, there’s nothing of interest to report 👍

Many thanks, I’m in serious learning mode.

The engines have a single EGR valve located in the V underneath the oil filter and cooler housing.

The role that EGR valves play in DPF regeneration is to stay CLOSED when engine management would normally be opening them so as to ensure that all the excess fuel that is injected for the regen gets to the catalytic converter so that the catalytic converter gets up to its maximum temperature so that the exhaust gets hot enough to burn the carbon in the DPF.

Ah, that makes sense Graeme

So in theory, blanking out the EGR should have no effect on DPF regeneration? Kev

2014 L405 RR Vogue SE 4.4 SDV8 in Corris Grey
2010 L320 RRS HSE 3.0 TDV6 in Stornoway Grey

So the reason someone will delete egr is to increase performance, increase mileage, try and rid of diesel engine issue.

If it is performance than this isn't a sports car. And if you really want a fast SUv then nothing can beat a 5.0L Petrol V8 supercharged.

If it the mileage then it won't be massive gains. Just drive better and you will get decent mpg. Or get a P400e.

If it is diesel engine failing issue due to egr getting clogged... then you are not driving the vehicle correctly and it isn't for you.

So which one of the above is it or something else?

I'd advise not to delete EGR or DPF.

My question was posed due to my experience with the 2,7 TDV6. They are troublesome in this engine, and are best blanked off. I was just asking if the SDV8 had the same problem. It obviously does not, so thanks for the explanations.

The 4.4's inlet tract gets as clogged as the 2.7's from exhaust gases mixing with oil vapour from the turbo(s). The only way to avoid the build-up would be to drive so that the EGR valve is never opened such as never allowing the engine to idle and never allow the engine to run on light throttle which are totally impractical options.

Without considering the legalities, I don't know if the 4.4's EGR can be mapped-out yet leave the DPF operational but I suspect it is quite achievable. Mapping out EGR is achieved by setting implausible condition parameters for EGR operation, such as unachievably high minimum engine operating temperature, noting that EGR is programmed not to operate until the engine has reached a pre-set minimum operating temperature.

I blanked the EGR on my L322's 4.4 for what turned out to be a very brief test. Light throttle response off idle was lovely (my biggest concern with a modified PCM map) but the moment I lifted off the throttle engine management closed the EGR butterfly to recycle exhaust gas through the now-blocked EGR valve which starved the engine of air which made the vehicle very awkward to drive. I look forward to having the opportunity to get EGR mapped out.

GraemeS like Landphil mention, it is illegal to delete egr or dpf in the UK. So it is not worth the research.

I'm not in the UK and my L322 doesn't have a DPF.

Plus, anyone should feel free to research whatever they want. What's deemed 'not worth the research' to one person, may be completely relevant and of interest to another.

Graeme's experimentation has given insight into how the engine works and how it performs under a particular set of conditions. Kev

2014 L405 RR Vogue SE 4.4 SDV8 in Corris Grey
2010 L320 RRS HSE 3.0 TDV6 in Stornoway Grey

Talk to the "Derv Doctor" or "Durham Remaps" for any EGR/DPF mods on the 4.4 Gone to a good home: 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
2025MY Defender D350 90 in Silicon Silver on coils
1974 Series 3 Lightweight = "Millie"
Many, many other Landies over the years
My preferred specialist: www.glenrands.co.uk
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Oh, and for gearboxes/diff oils changes then get Ian Bodsworth down from Telford (mobile) and he'll do it all on your drive. He knows his stuff and will be way cheaper than a main dealer and do a better job.
07770638023
Book him now. He's a busy guy after Sam posted this video:
 Gone to a good home: 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
2025MY Defender D350 90 in Silicon Silver on coils
1974 Series 3 Lightweight = "Millie"
Many, many other Landies over the years
My preferred specialist: www.glenrands.co.uk
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