Sport air filter

Hello fellow diesel enthusiasts,

I plan to change my air filter system (to optimize the intake).
'In my Golf III TDI (AFN), I've had an open K&N 57i kit installed for two years.'
I believe I have solved the absolutely necessary ventilation issue quite well - or at least, I thought I had.
I just happened to read that an open system can significantly reduce the potential performance.
There is still a lot of warm air around.
Furthermore, there is no possibility of registration in Germany. The Austrian TÜV inspection report, which I always carry with me for precautionary reasons, is not relevant here.
For those who are interested: The engine sound, at least in my car, sounds sporty and powerful.
That's why I got it in the first place. But does that mean we should do without the ABE?

What I've discovered now is also an air filter kit, but this one comes with a TÜV (German technical inspection authority) approval certificate.
I'm planning to combine this kit with a Dynamic Air intake from Bonrath, and I'd like to get your opinions on that.
How does such a long air hose affect performance at slower speeds?
Will the engine be more stable at lower speeds? The engine responds quite readily with 57i.
Does supplying the pre-compressed air to the loader under full load reduce wear and tear on the loader?
You can view the filter at twister-kit.de.
I'm also grateful for any other great suggestions.

Regards,
Michael.

'I wouldn't spend 159 euros on something like that!'

K&N 57i kits are now available with TÜV approval, so you could keep your kit installed and obtain the approval document from somewhere + carry it with you = almost legal. I'm not sure if the approval document applies to the older 57i models, you should check that!


Someone must have modified the area around the 57i engine with a kind of enclosure to prevent warm engine air from entering. I've just forgotten the website address.
Build something similar, or use an aluminum tube running from the air intake at the front, up to the 57i.

An open K&N filter doesn't offer any benefits for TDI engines because it only improves cylinder filling, but the turbocharger already determines the amount of air entering the cylinders.

Only noticeable in areas where the loader is not active (1Z below 1800).

Everything else is nonsense... too much hot air, loss of performance, whether with or without the bucket... over time, the air distributes itself within the engine compartment, and that's why engineers draw air from the fender (which is fresh and cold).

Exactly!

'In my opinion, K&N kits are simply a waste of money and look tacky for a TDI. If you're going to replace the filter, I would choose a different brand, as K&N filters are far too expensive.' For example, King Dragon also makes good filters, and they fit better than the K&N ones (which require an extra gasket).
'You'll keep the original [item] then.' You'll have adequate air supply and won't have to worry about performance losses.

Is there a separate gasket available for the KN replacement filter? I'm hearing this for the first time, especially since I've had it installed myself for a few thousand kilometers.

Why would you need a separate seal there?

Hello, you need an extra gasket for the K&N filter because it's not manufactured to the correct size (it's too flat), they just messed up. Also, the quality of workmanship is quite poor. Initially, the K&N filter was shipped without a gasket, and then there were occasional leaks in the air filter box, so an extra gasket was added. However, you can also use weather stripping for windows or doors, which you can stick to the edge of the air filter box lid if necessary. Or, like I do, sell the K&N and buy a King Dragon.

I can confirm this statement; I had a similar filter installed myself (with a sealing ring). After my mass airflow sensor (MAF) was damaged, I switched back to the K&N filter.
removed (TDi not suitable)

Manuel.

Hello, I cannot confirm that TDI is not a worthwhile option. With a sports air filter, there is less soot production under load, and in some speed ranges, there is also better acceleration.

Furthermore, I'm not yet convinced that the mass airflow sensor (MAF) is damaged by a sports air filter. The MAF sensor is generally a problem in diesel vehicles. In naturally aspirated engines, this is almost not an issue, and sports air filters are often used there. It should also be noted that a ventilation hose from the crankcase enters the top of the air filter housing. This is above the air filter, so the air filter cannot protect the MAF sensor from potential oily fumes. Perhaps that's also why the LLMs are breaking down.

I have a KN filter installed, and you don't need any special gaskets or anything else; it fits perfectly. I can't really imagine that the air filter housing for the TDI should be that different (except for the cutout for the mass airflow sensor) from the one for the TD. After all, K&N filters are supplied for all Golf 3 models the same way, except for the round filter that comes with some small 1.4 gasoline engines.

No idea what you're talking about, but it fits perfectly.

Hello, the issue with the sealing ring only applies to Golf IV, Audi A3, and Skoda Octavia models. It's needed because K&N made a mistake in their design. For other VW models, the K&N filter fits without a sealing ring, but the poor manufacturing quality remains.

..., however, the poor quality of workmanship remains.

What are you referring to? You must be able to provide some justification. Has it ever fallen apart before? Did it suddenly develop holes? You can't just put something out there without providing any justification.

TDIs tend to break down at least every 1000 km. (Just as an example.)

Hi, when you compare K&N filters to King Dragon filters, the King Dragon simply makes a much more solid impression. It feels noticeably more stable in terms of build quality, and the workmanship is much cleaner. In all my previous experiences with K&N filters, I've seen marks from the metal mesh visible on some parts of the plastic frame, and the K&N feels more like a flimsy white bread when you hold it. I've never seen anything like that with a King Dragon. The workmanship on every part of the filter is first-class and consistent, and it feels much more stable and rigid when you hold it. Since the KD is also a few euros cheaper, this level of build quality seems possible in this price range. Therefore, if possible, I would always opt for KD. I find the K&N to be more expensive compared to other options, mainly because of its sloppy workmanship.

Hi,

I have to say, the idea with the bucket is definitely not bad.
Assuming that absolutely no more engine heat is being drawn in.
I believe that diesel engines already have so much torque at low RPMs that the 'lack of power when starting' caused by warm air is less of a problem for them.
During operation, this system is guaranteed to be more effective than the simple, open version.
Would the TÜV (German technical inspection agency) be as enthusiastic about this installation? Not all inspectors appreciate the humor, and some may not issue a TÜV sticker.
The trouble might not even arise until a check or inspection.

The K&N replacement filter for my Golf III costs about 66 euros.
The SANDTLER sprint filter (polyester fleece, oil-free) is already a bargain at 40 euros.

But I'm still thinking about getting the Twister kit.
With hose and aluminum casing.
It definitely looks very appealing and has a certificate of inspection.
It's so versatile that you'll never need another filter again, no matter what kind of car you drive. Or?
I would appreciate hearing your opinions on this, especially.

Regards,
Michael.