P38: High Performance Air Filters....

Has anyone fitted any High Performance air filter kits to their P38?

Next question:

1. Which ones are recommended?

2. How much did you pay?

3. Have you seen any noticeable lift in performance?

Thanks in advance.

I think the jury is still out.
sum peeps luv em - other think they are crap.
They allow a higher volume of air to enter the combustion chamber - but dont filter out the grit so well, so possibly higher wear rates?

thinks its a personal choice.

Adam,
Hi, I'm new to this forum.
Just to put you in the picture I had a Freelander 1.8 petrol. I had it chipped and fitted a K&N air filter, bought from Scorpion Racing. It was fantastic - great acceleration and a noticable power increase. Sadly the freelander is no more.... don't ask!!!
However, I've now just bought a Range Rover 2.5DSE and this too has already been chipped by the previous owner and I have just fitted another K&N air filter. Again, this has improved acceleration and returns 33.8 mpg on long, steady runs. I am convinced this is the right filter and would have no hessitation in recommending one.
While I'm on reccomendations, I cannot praise highly enough Scorpion Racing in N. London. Visits to their workshop/shop are well worth a visit... Fantastic customer service, their coffee's great, range of products enough to blow your mind - if they haven't got it, you don't need it!! And, most importantly, really friendly, helpful, obliging staff. But, keep your wallet firmly in your pocket - you could spend a fortune.
Anyway, I digress, I fully support the K&N filter, but the choice is yours.... It is pricey, but you'll only ever need the one..
Let me know how you get on,
James.

If you get a DSE chipped properly with a good quality chip then I dont think you need a K&N filter.

On a steady run to Manchester recently up the M6 I got a average of 30MPG. I did get it up to 32 at one point by driving pretty gently, no harsh acceleration and overtaking, just had the cruise set to 75 and sat back.

A K&N filter in my opinion just sounds like you are trying to make the vehicle into something its not. If you want a sports car that will go dead fast then buy one for goodness sake.

-Wills

wills said:

A K&N filter in my opinion just sounds like you are trying to make the vehicle into something its not. If you want a sports car that will go dead fast then buy one for goodness sake.

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I think you miss the point of replacing the air filter.

Engine performance is increased as a by product of it providing your engine with more oxygen providing more power. Therefore your engine performs better and really should be considered as a standard upgrade.

Its not as you make out, to turn a RR into a Ferrari....

adamforeman, thanks for your response, you took the words out of my mouth. Thank goodness for at least one sensible reply.......

wills, it is my money, my car and my choice. I do not want some reliable Italian muck, otherwise I would have bought one. I just want a solidly built, safe car to transport the wife, our 2 dogs and my shooting clobber in - where in a Ferrari would I be able to fit a gun cabinet??

We are all entitled to our point of view on this forum and adam only asked a straight forward, simple question, inviting responses and I offered him some help. I was not representing any other person on this forum, just my own personnal findings....
James.

James,

I have seen that J E Engineering Sell Maxogen - Barrel type Performance Filters which range from £48 to £62. Does this sound like a good deal price wise?

They mention they are manufacturers of the worlds leading foam air filters and suppliers to the current F1 World Manufacturers Champions.

As I have no clue, can someone confirm?

Thanks

Adam

james2.5dse said:

where in a Ferrari would I be able to fit a gun cabinet??

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James,

You took the words out my mouth! I have three rifles and there is no way I can fit them into what is practically a cubby hole in a Ferrari...or any other sports car for that matter!

Adam

I currently run a 4.6 P38 on LPG and having spoken to an LPG installer he recomended I fit one as when the RR was converted to gas they have not fitted anything to prevent damage to the airbox should there be a backfire. Not having the cash immediately avaliable I had yet to get one when on a cold morning I got one hell of a backfire and when I looked under the bonnet the airbox has been blown appart!! So I have temporarily repaired the existing airbox and I will look for a good performance filter. The reason for this being better is that if there is a backfire it does not get trapped in an enclosed airbox and can vent straight through the filter. Not to mention the fact that performance filters are cleanable and help to slightly improve engine responce by allowing the engine to breath a little more freely.
Cheers, Andy.

Good sunny evenig to you all.
Just as a question, how much extra bhp/torque do you reckon you get from these filters and chips (which is almost fish and chip's if you say it quick!).

Cheers, Nick.

They reckon up to 5bhp!
A high performance air filter is the best way to wreck an engine , what ever let's more air in quicker is gunna let more crap in especially in a dusty environment.I certainly wunt have one!

Jason2 said:

They reckon up to 5bhp!
A high performance air filter is the best way to wreck an engine , what ever let's more air in quicker is gunna let more crap in especially in a dusty environment.I certainly wunt have one!

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Sorry to burst your bubble, but in fact what do you think happens with your original bog standard air filter?

If you buy a K&N filter it simply replaces it. Its the foam element of the filter that alllows more air to flow. Buying a more expensive filter means that the foam is in fact far better at filtration of dirt etc.

Put a cheap nasty one in and yes your going to have potential problems.

There are barrel versions that are better or if you have a ton of money replace the air intake system at the cost of £500-600.

adamforeman said:

I think you miss the point of replacing the air filter.

Engine performance is increased as a by product of it providing your engine with more oxygen providing more power. Therefore your engine performs better and really should be considered as a standard upgrade.

Its not as you make out, to turn a RR into a Ferrari....

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Think YOU miss the point im trying to make...

The engines were designed with that type of air intake/filter for a reason. The intake/filter was designed to allow the correct flow of oxygen into the engine at the correct rate and volume.

Changing what the engine was designed for can only be a bad thing in my opinion. You are making the engine work outside the designed tolerances which as I said can only be bad.

Not only that is it REALLLLLLLY worth spending money on an upgrade that gives you a hardly noticeable difference in power?? Secondly, where do you fit the K&N filter?? Where the current air filter housing is?? If so you will again be changing what the engine was designed for - if you just stick the K&N filter on the end of the tube where the housing was you are just going to draw in hot air from around the engine bay which can only be a bad thing.

hmmm, its a stupid idea in my view, next people will be adding 'neonz' to their Range Rovers

-Wills

adamforeman said:

Sorry to burst your bubble, but in fact what do you think happens with your original bog standard air filter?

If you buy a K&N filter it simply replaces it. Its the foam element of the filter that alllows more air to flow. Buying a more expensive filter means that the foam is in fact far better at filtration of dirt etc.

Put a cheap nasty one in and yes your going to have potential problems.

There are barrel versions that are better or if you have a ton of money replace the air intake system at the cost of £500-600.

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adamforeman your not bursting any bubbles mate, you asked a question and I gave you an answer.now your telling us!

Every one that I know that uses high performance air filters are in motorsport and dont give a ****e about wrecking engines as they usualy wreck em anyway. They dont have them on their everyday cars though.

Your engine mate do what you want with it!

You have it the totally the wrong way round.

Bad weather such as cold temperatures (high moisture), rain, snow and strong winds are all tough on air and oil filters. When moisture from condensation finds its way into your engine's air inlet system, your original LR paper air filters can lose its shape and much of its filtering ability.

Paper air filters by the nature of their construction restrict airflow to your engine and as a result can quickly become clogged with dirt, and require frequent replacement.

Worse yet, as we seem to be experiencing very high winds over the last few months, dust blown into your RR's air intake system can cut an air filter's useful life in half.

So why should you consider buying and replacing your RR's paper air filter with a cotton-gauze-type filter?

Why? Well this style of filter does many things to enhance the performance and durability of your engine.
A cotton-gauze air filter offers superior filtering capability, catching the smallest dirt particles that can literally wear out your engine. An added benefit of low-restriction filters is that they allow more air to flow into your engine for a power increase of up to 15%. Less restriction also can increase fuel mileage, something every Range Rover driver can appreciate.

Best of all, it's the last air filter you'll ever need because they're washable and reusable, saving you money in the long term.

adamforeman said:

So why should you consider buying and replacing your RR's paper air filter with a cotton-gauze-type filter?

Why? Well this style of filter does many things to enhance the performance and durability of your engine.
A cotton-gauze air filter offers superior filtering capability, catching the smallest dirt particles that can literally wear out your engine. An added benefit of low-restriction filters is that they allow more air to flow into your engine for a power increase of up to 15%. Less restriction also can increase fuel mileage, something every Range Rover driver can appreciate.

Best of all, it's the last air filter you'll ever need because they're washable and reusable, saving you money in the long term.

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ok, you are secretly a sales rep for K&N. I fully understand now - ty

-Wills

wills said:

ok, you are secretly a sales rep for K&N. I fully understand now - ty

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Awwww...you got me!

The guy that does my servicing reckons its a big improvement, fitting a K&N, removing cat and egr and having a fiddle with the pump. The whole package including a new front pipe without a cat, is £200. I was thinking of removing the egr and putting in the K&N which would just leave the pump settings as my cat has gone anyway. Can you recomend a good stockist? I have seen them going for anything from £38 up to about £80 which seems a tad steep for a bit of sponge dipped in oil....

revjames said:

I have seen them going for anything from £38 up to about £80 which seems a tad steep for a bit of sponge dipped in oil....

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I agree! I was wondering myself which one to go for. According to JE Engineering they mention Maxogen filters, whilst other sites mention K&N quite a bit.

Which is better? Maxogen provide barrel types which again I'm unsure whether barrel styled filters perform better or not.

I may have to do more research and some telephone calls.

adamforeman said:

Has anyone fitted any High Performance air filter kits to their P38?

Next question:

1. Which ones are recommended?

2. How much did you pay?

3. Have you seen any noticeable lift in performance?

Thanks in advance.

Click to expand...

Adam,

I fitted a K & N filter last year and tested the economy carefully. I gained between 0.5 and 1 mpg which was worth it as it saves replacing the filter all the time. I then fitted a 'digital power upgrade box' froim Rimmer Bros. and gained a massive increase in performance, particularly in acceleration See the road test on http://www.rimmerbros.co.uk/pdf/LEMarch04.pdf . My economy cruising and driving carefully has been up to around 33 mpg on a run and averages around 28 locally. I recommend both items as it makes the P38 into a much nicer vehicle to drive. One word of warning - insurance - if you fit a power upgrade box and don't tell the insurance it will invalidate your policy. My AA insurer declined to renew when I told them I had fitted the box but Ensleigh came across trumps when I told them it was fitted and it diddn't cost me any more! Richard