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agentmulder



Member Since: 16 Apr 2016
Location: Outer Space
Posts: 1324

Kuwait 
After having installed the cage and had a good look at the standard intake design in the process I can certainly see (through) its shortcomings.

Meanwhile most 'forum wisdom' indicated that RAIs were rubbish in terms of airflow and were only really there for wading (assuming they were actually installed properly) or looks - but here I am reading positive anecdotes from a sensible member and word of dynamometer data to back it up from another.

Sheesh, did this part just get put in my 'defender - to buy' links list ?

I think, maybe Razz

I'm often driving around in dusty environments and a couple of extra HP never hurt ...

It's a RHD 2.4 puma - pretty much a SW clone of blackwolf's DC

Laughing Solved the bowel problem, working on the consonants...


Last edited by agentmulder on 30th Mar 2017 4:58am. Edited 1 time in total
Post #613184 29th Mar 2017 10:33pm
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Wild Card 90



Member Since: 03 Dec 2014
Location: Gerlingen
Posts: 1060

England 2012 Defender 90 Puma 2.2 SW Indus Silver
MK wrote:
so whats with the air intake for the cabin? (LHD) Question

As already described, on my LHD one the cabin air intake is moved to the side opening. Also a short and direct 78 mm tube, and no danger of issues with snow or leaves.

When i bought the vehicle, the zyclone fliter had a painted housing. i later fitted a clear one, and am always surprised by how much debris ends up caught in the filter "bowl". Rather have it there than blocking the air filter element. Open wing nut, tip out the debris, and all is good!


Click image to enlarge



Click image to enlarge
 1998 Tdi 90 SW,
2008 Td4 90 SW,
2012 2.2 90 SW,
2" raised Trailmaster/Terrafirma
Heavy Track Raids, 255 MTīs,
Recaro CSīs, anorak, wellingtons
Post #613196 30th Mar 2017 4:56am
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geobloke



Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4350

United Kingdom 
agentmulder wrote:
After having installed the cage and had a good look at the standard intake design in the process I can certainly see (through) its shortcomings.

Laughing


The only other real options for those of us with Roll Cages are the original Mantec RAI and the protection and performance RAI. The latter I have and I am very happy with the quality of it. Has a 3" tube and wing mount. Down side is that P&P have not taken it one step further and continued their system on to the airbox. Another issue albeit a small one is that their RAI has been designed for their cages and hence the fixing tabs do not align with the SD cage I have...


Click image to enlarge


I would very much like to see the Naka roll cage version and in particular how it fits... I would consider swapping...
Post #613214 30th Mar 2017 8:06am
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camelman



Member Since: 27 Feb 2013
Location: Peak District
Posts: 3308

United Kingdom 
There is also the Southdown snorkel which can be fitted with a cage at Ģ159.
Again fully sealed through to the airbox

You down have to cut your wing but if you've just bolted a cage to your truck and drilled holes all over the body that's not too much of an issue Smile. It's also relatively 'subtle'



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Post #613224 30th Mar 2017 8:45am
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 16809

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
It is true that a snorkel or RAI will, other things being equal, restrict airflow more than not having an RAI.

- the longer the pipe, the more restriction there will be,
- the smaller the pipe, the more restirction there will be.

The most significant restriction on airflow on a standard TDCi is the pathetic pipe from the OE wing side intake to the airbox. This is massively restricted, and quite honestly whatever you do is unlikely to make much difference with this pipe still in place. It also leaks like a seive since it has many poorly-fitting joins.

The reason I chose the Nakatanenge RAI was because it was the only one which eliminates this pipe - it replaces it with one with a CSA about 5 times the original. The Nugget Duct does the same job, but is slightly more restricted than the Nak solution and also (of course) still uses the wing side intake. I do not know of any other off the shelf RAIs other than those from Nak which use such large bore pipework.

All the other RAIs such as Southdown, Mantec, etc, leave the restrictive and leaky OE pipe in situ.

So the bottom line, the OE setup without any RAI will be marginally better than the OE setup with an RAI, but the difference will be negligible.

The Nakatanenga RAI will massively outperform any setup which leavs the original pipework in place.

Since the Nak RAI also provides and extremely effective centrifugal pre-filter, you can with complete safety remove the centrifugal cleaner from the airbox, thus eliminating the second-most restrictive part of the OE system. It is also of course fully sealed.
Post #613240 30th Mar 2017 10:00am
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camelman



Member Since: 27 Feb 2013
Location: Peak District
Posts: 3308

United Kingdom 
HI Blackwolf,
the Southdown snorkel replaces all of the existing pipework through to the airbox giving a sealed system. 
Post #613247 30th Mar 2017 10:08am
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 16809

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
^^ Thank you, I didn't know that!
Post #613250 30th Mar 2017 10:29am
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thrasher



Member Since: 04 Jan 2017
Location: isle of arran
Posts: 17

Scotland 2007 Defender 90 Puma 2.4 HT Bonatti Grey
thanks everyone,i do like the wing top rai,but its a bit over the top with the cyclone filter,im really liking the nugget coversion as that's really what I'm after to get rid of the crap pipe that land rover fitted , and get better airflow as I have an alive tune and decat with straight centre pipe so that should help with breathing
cheers gus
Post #613322 30th Mar 2017 4:17pm
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Lancerdoc999



Member Since: 10 Apr 2016
Location: South Wales
Posts: 205

United Kingdom 
Is all of this the same for a Td5 with RAI? Mine came fitted when I bought it. Had always wondered if should remove.
Post #613451 30th Mar 2017 10:11pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 16809

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
The TD5 doesn't have the same problem with a pathetic pipe from wing intake to airbox, as far as i know, but the general comments about RAIs of small diameter restricting the airflow still apply. I am unfamiliar with the TD5 Defender airbox but suspect that it too has a fairly restrictive centrifugal cleaner built it, but although many people just remove these without problems personally I wouldn't unless I had some alternative precleaner.
Post #613528 31st Mar 2017 9:47am
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geobloke



Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4350

United Kingdom 
Hi Blackwolf. The TD5 airbox does indeed have the same centrifugal thingamy as the TDCI... On the list for eradication...
Post #613601 31st Mar 2017 2:50pm
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Sadi



Member Since: 23 Jul 2015
Location: Windhoek
Posts: 334

Namibia 2016 Defender 110 Puma 2.2 Heritage Edition SW Grasmere Green
2 Gauges here that could help measure restriction before and after modifications to the fresh air supply:

http://asgard-engineering.com/product-cate.../defender/
Post #613854 1st Apr 2017 7:46pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 7664

2011 Defender 110 Puma 2.4 USW Stornoway Grey
[quote="blackwolf".


The Nakatanenga RAI will massively outperform any setup which leavs the original pipework in place.

[/quote]

And so will the nugget solution Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop
Post #613936 2nd Apr 2017 7:13am
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WeiB.beer



Member Since: 13 Apr 2016
Location: Hertfordshire
Posts: 57

United Kingdom 2015 Defender 110 Puma 2.2 Heritage Edition SW Grasmere Green
Wild Card 90 wrote:
MK wrote:
so whats with the air intake for the cabin? (LHD) Question

As already described, on my LHD one the cabin air intake is moved to the side opening. Also a short and direct 78 mm tube, and no danger of issues with snow or leaves.

When i bought the vehicle, the zyclone fliter had a painted housing. i later fitted a clear one, and am always surprised by how much debris ends up caught in the filter "bowl". Rather have it there than blocking the air filter element. Open wing nut, tip out the debris, and all is good!


Click image to enlarge



Click image to enlarge


I have a LHD 2015 Heritage and I'm really not keen on drilling new holes in this car (I want any modifications to be completely reversible). Can you possibly answer 2 questions for me:

1. How is the snorkel fixed to the windscreen frame?
2. Where did the side vent cover come from?

Thanks in advance,
Matt 2015 110 Defender Heritage Utility Station Wagon
2014 B8 Audi RS4
2003 Audi A2 1.4 Tdi
Post #614089 2nd Apr 2017 7:18pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 16809

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
1. Four screws into the windscreen frame.

2. It comes with the Nakatanenga kit for LHD vehicles, it is not supplied in the RHD kit since it is not needed.

Edit - it's actually 5 screws, not 4.


Last edited by blackwolf on 4th Apr 2017 9:36pm. Edited 1 time in total
Post #614134 2nd Apr 2017 10:30pm
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