K&N filters

[Terranical]

Gonna change my air filter when I'm back in Spain in a few weeks (through the summer it gets dust-clogged very quickly), so my question is this - a standard filter at 12 or 13€ or a K&N at 45 or 50€ ( in the original airbox of course).

I know the K&N will probably outlast the car, but it still has to be washed and re-oiled regularly, and the K&N cleaner and oil are not far short of the cost of a standard filter, so my question is this - how much better is a K&N? :nenau

 

[makeitfit]

I got mine for better air flow rather than cost per mile , so cant answer you properly.

 

[96terrano]

Gonna change my air filter when I'm back in Spain in a few weeks (through the summer it gets dust-clogged very quickly), so my question is this - a standard filter at 12 or 13€ or a K&N at 45 or 50€ ( in the original airbox of course).

I know the K&N will probably outlast the car, but it still has to be washed and re-oiled regularly, and the K&N cleaner and oil are not far short of the cost of a standard filter, so my question is this - how much better is a K&N? :nenau

Well I buy generic ones off eBay, just as good as k&n £7, i just use cheap £3 oil too

 

[rustic]

Well I buy generic ones off eBay, just as good as k&n £7, i just use cheap £3 oil too

I wonder if there is any correlation between you buying cheap and the number of problems that you are having with the vehicle.

just a thought...:doh


:lol:lol

 

[96terrano]

I wonder if there is any correlation between you buying cheap and the number of problems that you are having with the vehicle.

just a thought...:doh


:lol:lol

Well, the problems have gone since me dad stopped useing it...yay:thumb2 I think I found the cause:lol if ya want somthing destroyed, employ a Scotsman :lol, I'm not too bad as 'im more English/irish then Scott

 

[solarman216]

Gonna change my air filter when I'm back in Spain in a few weeks (through the summer it gets dust-clogged very quickly), so my question is this - a standard filter at 12 or 13€ or a K&N at 45 or 50€ ( in the original airbox of course).

I know the K&N will probably outlast the car, but it still has to be washed and re-oiled regularly, and the K&N cleaner and oil are not far short of the cost of a standard filter, so my question is this - how much better is a K&N? :nenau

the K and N does not filter anything like your original paper filter they are used for performance purposes not engine life reasons, to be honest you may as well run with no filter at all as a K & N, but you mention oil, now if this is a metal mesh filter in a can with about a pint of oil in the bottom then this is a very different matter, Rick

 

[AD Ent]

There is always the direct replacement k&n. It doesn't have to be the induction Kit

 

[glanrichbex]

the K and N does not filter anything like your original paper filter they are used for performance purposes not engine life reasons, to be honest you may as well run with no filter at all as a K & N, but you mention oil, now if this is a metal mesh filter in a can with about a pint of oil in the bottom then this is a very different matter, Rick

I don't get it

Please can someone explain to me how a K&N filter gives better performance.

Someone told me that a MAF on a diesil fuel injected engine measures the air flow and applies the correct amount of fuel in ratio to the air volume so easier air flow doesn't make sense to me on a diesil engine.

A petrol engine with a carb relies on the vacuum created so making an easier airflow decreases the vacuum and makes the mixture leaner???

A fuel injected petrol engine MAF or vane sensor measures the flow of air and applies the correct fuel mix.

Manufacturers of engine strive to squeeze every bit of efficiency and BHP from an engine .... why don't they use a K&N filter? :nenau

 

[geoffdown]

I don't get it

Please can someone explain to me how a K&N filter gives better performance.

Someone told me that a MAF on a diesil fuel injected engine measures the air flow and applies the correct amount of fuel in ratio to the air volume so easier air flow doesn't make sense to me on a diesil engine.

A petrol engine with a carb relies on the vacuum created so making an easier airflow decreases the vacuum and makes the mixture leaner???

A fuel injected petrol engine MAF or vane sensor measures the flow of air and applies the correct fuel mix.

Manufacturers of engine strive to squeeze every bit of efficiency and BHP from an engine .... why don't they use a K&N filter? :nenau

the k&n allows air to be drawn in easier manufacturer wants to save money not make engine with max bhp what i no is quite afew on here have k&n on thier 2.7tdi and like me found it gives better accerlation then standard filter so thats how to tell it really works:augie

 

[stinka]

Yes, less restrictive so more air into cylinders and the maf then puts more fuel in so engine makes more power

 

[rustic]

I don't get it
Please can someone explain to me how a K&N filter gives better performance.

As Rick says, it does't filter as well as paper ones, so it in effect has bigger holes, lets more crud in, but lets more air in with less restriction.

More air plus more fuel, = more power.

The paper filters will clog quickly with the fine dust that will go straight into the engine on a K& N one.

Depending on where the vehicle is used, ie dessert, then this would cause additional engine wear, and the increase in warranty claims, so that's why they are not fitted in the factory.


My outboard engine does not have an air filter, I guess the is less dust close to water.

 

[rustic]

Yes, less restrictive so more air into cylinders and the maf then puts more fuel in so engine makes more power

That's ok on the Tdi, but the Td is a mechanical pump, no MAF so do you need to increase the fuelling to get the benefit?

 

[melissachels]

Well, the problems have gone since me dad stopped useing it...yay:thumb2 I think I found the cause:lol if ya want somthing destroyed, employ a Scotsman :lol, I'm not too bad as 'im more English/irish then Scott

that maybe cos toby's no going far to notice?

 

[stinka]

That's ok on the Tdi, but the Td is a mechanical pump, no MAF so do you need to increase the fuelling to get the benefit?

Well, strictly speaking it alows the turbo to force more air into the cylinder anyway so I guess you'd have to turn the fuel screw up a bit to richen it up to see the best gains

 

[rayf3262]

A non restrictive air filter will show a performance gain on a TDi is down to the fact that the initial airflow around 1800 rpm is potentially greater due to the free flow nature of a K&N type filter.
On a MAF managed engine this will automatically increase the initial fueling to match the airflow giving a better low speed response, after ~3000 rpm it all evens out.
Getting some more fuel in early, with air to match at low engine speeds improves the spool rate of the turbo.

 

[solarman216]

knew ray would have the answer, Rick

 

[Lazy-Ferret]

A non restrictive air filter will show a performance gain on a TDi is down to the fact that the initial airflow around 1800 rpm is potentially greater due to the free flow nature of a K&N type filter.
On a MAF managed engine this will automatically increase the initial fueling to match the airflow giving a better low speed response, after ~3000 rpm it all evens out.
Getting some more fuel in early, with air to match at low engine speeds improves the spool rate of the turbo.

I can see that, but what I do not understand, is the MAF is measuring it all before the turbo and intercooler. Cold damp air is denser than hot air, so surely it is still a bit hit and miss, as it does not actually know what air is going into the engine.

 

[rayf3262]

I can see that, but what I do not understand, is the MAF is measuring it all before the turbo and intercooler. Cold damp air is denser than hot air, so surely it is still a bit hit and miss, as it does not actually know what air is going into the engine.

All air that goes into the engine passes the MAF (unless there's a leak!).
The airflow seen by the MAF will be directly influenced by the turbo, even though the MAF is measuring the air input to the turbo. That's why the ECU is able to indicate an over-boost error when the measured volume of air falls outside of the MAP curve by a predefined amount.
The MAF will become saturated (maxed out) at engine speeds in excess of ~3000 RPM, so any increase in airflow above this sort of engine speed is effectively no longer metered anyhow.
Hit and miss or not, it's how the majority of modern diesels operate. VAG have a MAF upstream of the turbo too, although they do also have a manifold absolute pressure sensor too which makes it a little less hit & miss. The ZD30 also has a MAP sensor in addition to the MAF, however, this plays no part in the management process other than to check for excess boost pressure from the VNT.

 

[Lazy-Ferret]

All air that goes into the engine passes the MAF (unless there's a leak!).
The airflow seen by the MAF will be directly influenced by the turbo, even though the MAF is measuring the air input to the turbo. That's why the ECU is able to indicate an over-boost error when the measured volume of air falls outside of the MAP curve by a predefined amount.
The MAF will become saturated (maxed out) at engine speeds in excess of ~3000 RPM, so any increase in airflow above this sort of engine speed is effectively no longer metered anyhow.
Hit and miss or not, it's how the majority of modern diesels operate. VAG have a MAF upstream of the turbo too, although they do also have a manifold absolute pressure sensor too which makes it a little less hit & miss. The ZD30 also has a MAP sensor in addition to the MAF, however, this plays no part in the management process other than to check for excess boost pressure from the VNT.

I see... as you say it works, but you can't help but wonder who had the hair brained idea in the first place, and managed to get away with it...:lol

 

[geoffdown]

I see... as you say it works, but you can't help but wonder who had the hair brained idea in the first place, and managed to get away with it...:lol

have u seen how much oil can go throught the intercooler where it is its much cleaner:thumb2