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L320.tdv8



Member Since: 19 Sep 2025
Location: Lincoln
Posts: 4

United Kingdom 2010 Range Rover Sport TDV8 SE Alaska White
Cone filter/airbox delete

Has anyone put cone filters on instead of the airbox? Normally I wouldn't bother doing this on a vehicle but I dont like the idea of both turbos sharing 1 single air box especially if theres any turbo failure.

I know this will not appeal to the majority but in reality are there any downsides other then potential heat soak? I would buy proper cone filters not just 15 quid amazon specials so filtration wouldn't be an issue

Post #649883 Fri Sep 19 2025 5:20pm
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NoExpert



Member Since: 28 Jan 2022
Location: Poznań, Poland
Posts: 511

Poland 2011 Range Rover Sport 3.0 TDV6 HSE Lux Fuji White

Downside is they’re usually oil media which kills MAF sensors.
I’m just curious, why would sharing an airbox be an issue if there’s a turbo failure? 2011 RRS HSE Luxury 3.0 TDV6 Fuji White on Ebony/Ivory
Born and raised in So Cal. Moved to the UK in 2018 for a few years. Now in Poland and looking at moving back to the UK.

Post #649885 Sat Sep 20 2025 4:13am
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RRSTDV8



Member Since: 13 Aug 2011
Location: Northamptonshire
Posts: 9144

United Kingdom 2012 Range Rover Sport SDV6 HSE Orkney Grey

My question too - the turbos share an air filter and that's it. Once the air is on its way to the compressor it's separate and once it's gone through the compressor then the air filter is irrelevant. How would the air filter change the outcome of a turbo failure?

From memory, the two sides of the inlet manifold are connected to allow for balancing so if there's going to be cross contamination following a turbo failure, it can happen in the inlet manifold anyway, assuming the valve is open. 2012 SDV6 - it's missing a couple of cylinders
2008 TDV8 - it was a labour of love and is much missed

Post #649893 Sat Sep 20 2025 1:00pm
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L320.tdv8



Member Since: 19 Sep 2025
Location: Lincoln
Posts: 4

United Kingdom 2010 Range Rover Sport TDV8 SE Alaska White

Ive purchased 2 quality air filters that are not oil saturated for filtering so shouldn't kill the maf.

I have a friend who's turbo failed and the air box was completely full of oil, literally dripping and the air filter was completely clogged. I can only assume the only way that is physically possible is if the failed turbo has leaked oil into the intake side of the turbo and then the working turbo has sucked the oily air from the failed turbo back up the intake path and back into the airbox and then sucked it through into the good turbo.

I know it won't prevent turbo failure but it shouldn't be as catastrophic if I do experience a turbo failure if they both have independent air intakes.

Post #649895 Sat Sep 20 2025 1:31pm
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41jules1967



Member Since: 01 Jun 2025
Location: Leeds
Posts: 124

United Kingdom 

This seems very odd. The direction of airflow is filter down to turbo. There should be no way for air to flow back. I thought the turbos on the TDV6 are below the level of the airbox so oil couldn't flow down either.

Sharing an intake between the 2 should make no difference. I don't think I've ever heard of a single case where one turbo has taken out the other.

This sounds like making a false assumption based on partial data and then acting on it. I'd want further investigation into how the oil got there first. 2021 L494 D300MHEV Autobiography
2019 Discovery Sport D180 HSE

Post #649908 Mon Sep 22 2025 8:25am
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Pistnbroke



Member Since: 22 Sep 2020
Location: rugby
Posts: 469

United Kingdom 2009 Range Rover Sport TDV6 HSE Galway Green

If one turbo has failed and is not spinning but leaking oil the working one will blow air "the wrong way" thought the bad ,stalled turbo and up into the airbox. Always listen to old people or when they die you will live on in ignorance.
The avatar is a picture of the man with a big cock.
Learned to 4x4 on 100 mile beach and Frazer Island QLD
Dont spend money on old cars you will never get it back

Post #649909 Mon Sep 22 2025 8:42am
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41jules1967



Member Since: 01 Jun 2025
Location: Leeds
Posts: 124

United Kingdom 

If they're plumbed that way, then presumably there's no way to separate them for 2 separate intakes? 2021 L494 D300MHEV Autobiography
2019 Discovery Sport D180 HSE

Post #649911 Mon Sep 22 2025 8:55am
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Pistnbroke



Member Since: 22 Sep 2020
Location: rugby
Posts: 469

United Kingdom 2009 Range Rover Sport TDV6 HSE Galway Green

who knows mine is a 2.7 Always listen to old people or when they die you will live on in ignorance.
The avatar is a picture of the man with a big cock.
Learned to 4x4 on 100 mile beach and Frazer Island QLD
Dont spend money on old cars you will never get it back

Post #649912 Mon Sep 22 2025 8:59am
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RRSTDV8



Member Since: 13 Aug 2011
Location: Northamptonshire
Posts: 9144

United Kingdom 2012 Range Rover Sport SDV6 HSE Orkney Grey

41jules1967 wrote:
If they're plumbed that way, then presumably there's no way to separate them for 2 separate intakes?


They meet at the air filter box. So if one thought the oil blowing back issue was a thing, taking the filter box off and giving 2 separate filters would avoid that. The usual thing is that the blown turbo dumps oil in to the intercooler and whilst the intercooler is set up to flow the two sides separately (two intercoolers in one housing), it's possible for oil to get between the two, I seem to remember.

As cone air filters are quite big, usually, I wonder if there's enough room in the space currently housing the filter box to put in 2 cone filters. The MAFs are immediately outside the filter box and fitted to preformed elbows so some new pipework will also be required in order to both position the filters and house the MAFs. I can see one of the filters being place low down which could put it at risk of ingesting water (the engine bay not being a sealed environment) if someone drove through deep water.

An interesting exercise even though I'm not convinced that the OPs reason for doing it is correct. Would be interested to see photos of the install, however. 2012 SDV6 - it's missing a couple of cylinders
2008 TDV8 - it was a labour of love and is much missed

Post #649913 Mon Sep 22 2025 9:27am
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L320.tdv8



Member Since: 19 Sep 2025
Location: Lincoln
Posts: 4

United Kingdom 2010 Range Rover Sport TDV8 SE Alaska White

I fitted the 2 cone filters. If you unbolt the mafs from the air box the maf has a lip that is perfect for a 70mm air filter to fit straight on to so no additional pipe work ir required and they fit with just the air box lid removed. I do need to make some sort of bracket to keep them from wobbling and keep them further apart but that's not a big task

I do agree thats its all based on assumptions but I spent a full day just thinking how on earth can that much oil get into the air box. I did wonder if it was a pcv fault but the pcv vents right next to the nearside turbo intake so thats too far away and too low to travel into the air box if someone had gone faulty in the pcv system. The only way I can think is from 1 dead turbo being sucked by 1 good working turbo.

Im not suggesting anyone else go out and perform this modification but I really think if I have 1 complete turbo failure where it fails to even spin it will prevent my other turbo from dying and hopefully my engine seizing which is what happened to my friends tdv8 after the air box and air filter became full of oil. Given how oily it all was I think its lucky the engine didnt run away.

Just for the record ive driven it with no negative side affects and no errors on the dash so i will continue to use this setup for now.

Post #649914 Mon Sep 22 2025 9:39am
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L320.tdv8



Member Since: 19 Sep 2025
Location: Lincoln
Posts: 4

United Kingdom 2010 Range Rover Sport TDV8 SE Alaska White


Im attempting to attach a picture

Post #649915 Mon Sep 22 2025 9:41am
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RRSTDV8



Member Since: 13 Aug 2011
Location: Northamptonshire
Posts: 9144

United Kingdom 2012 Range Rover Sport SDV6 HSE Orkney Grey

That fits more easily than I imagined it would - I was thinking about the cone filters that have wide bases like they used to sell in Max Power back in the day Laughing .

Be interested to hear about the respective performance, any noise increase, etc. with the new set up. Not something I'd bother doing myself but useful to have info to share if someone else asks the question in the future. Thumbs Up 2012 SDV6 - it's missing a couple of cylinders
2008 TDV8 - it was a labour of love and is much missed

Post #649917 Mon Sep 22 2025 10:10am
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