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Naycrx

Member Since: 11 Oct 2023
Location: Nottinghamshire
Posts: 140

Air box filter and Mod

Morning

I replaced our Air Filter yesterday on our 2.4 puma. Genuine land Rover filter.... Its definitely smoother, so happy with that .My next question is , the little impeller style thing in the airbox is it worth removing? We have a snorkel on at the moment but have seen comments of improvement.

Also would it need mapping if this was removed

Best regards

3rd Feb 2025 10:48am

andy63

Member Since: 30 Jun 2023
Location: north east
Posts: 610

The little impeller thing is there to give motion to the air to separate moisture..
I think if you have a close look you will see an outer tube within the housing which has a drain to remove any moisture separated..

I followed black wolfs suggestion and fitted a centrifugal separator at the rai inlet and then removed that little vane..
I can not say with any real certainty how effective the centrifugal separator is on my rai but on a recent trip where we were sometimes driving in dust where at times you could hardly see beyond the end of the bonnet, my filter didn't appear to be as bad as I would have expected when removed..
There are threads on the surgery some carry out on the standard filter to improve air flow..👍

3rd Feb 2025 11:42am

Naycrx

Member Since: 11 Oct 2023
Location: Nottinghamshire
Posts: 140

right ok thanks .... i best leave it in there then ! was thinking of cutting it out

3rd Feb 2025 6:23pm

andy63

Member Since: 30 Jun 2023
Location: north east
Posts: 610

no need for surgery to remove the little vane...it can be pulled out without cutting..

3rd Feb 2025 7:16pm

Naycrx

Member Since: 11 Oct 2023
Location: Nottinghamshire
Posts: 140

So with the snorkel fitted , I can remove it and no other modifications are needed? I remap etc

3rd Feb 2025 7:18pm

andy63

Member Since: 30 Jun 2023
Location: north east
Posts: 610

https://www.defender2.net/forum/topic25864-150.html

some pictures at the end of the thread linked to of the air box....
only connection to a remap would be the improved air flow capability, if it was required..

3rd Feb 2025 7:19pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20590

Airbox mod is well worth doing.

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4th Feb 2025 1:50pm

Naycrx

Member Since: 11 Oct 2023
Location: Nottinghamshire
Posts: 140

So now the RAI is fitted with the larger diameter pipe, Is there any reason to cut anything out the air box or can i just remove the 'Fan'

4th Feb 2025 1:53pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17559

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

Does your RAI have a cyclonic precleaner to spin the moisture out, and have you replaced the hopelessly inadequate ducting between the wing and the airbox? If not, then leave the original centrifugal separator in place since you will get moisture in the airbox.

If your RAI does have a precleaner and you have replaced the ducting with a sealed pipe then I would suggest doing the full airbox mod (so remove the stator and cut out most of the other restrictive parts) in order to get the best performance you can.

4th Feb 2025 4:01pm

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