K & N or stock air box?

[solex3274]

I would be interested in hearing from anyone regarding the use of a performance air filter on a 944 2.5L engine. This is a basic upgrade that would increase the performance of the engine right? Not according to a 944 racer that I recently talked with. According to the racer, he experienced a slight HP drop when the K & N filter was installed. In addition the filter paper should be dry, the oil from the K & N gets in the throttle body. Has anyone had a similar experience?

[jonvo]

Stock air box is supposed to be the best. It's a cold air with a large surface area filter.

Cold air intake?

[oliver88]

stick with a Mahle Microstar...K&N claims are way overblown and they do indeed allow fine particles through the media...you won't notice a difference in the butt dyno but your engine will thanks you.

[Rasta Monsta]

We need a sticky thread at the top of this forum.

HOW CAN I GET A BIG, CHEAP, BOLT-ON HORSEPOWER BOOST FROM MY 2.5 NA?

Answer: you can't.

[John_AZ]

Originally Posted by solex3274

I would be interested in hearing from anyone regarding the use of a performance air filter on a 944 2.5L engine. This is a basic upgrade that would increase the performance of the engine right? Not according to a 944 racer that I recently talked with. According to the racer, he experienced a slight HP drop when the K & N filter was installed. In addition the filter paper should be dry, the oil from the K & N gets in the throttle body. Has anyone had a similar experience?

solex is referring to the the stock air filter replaced with a K&N air filter and placed inside the stock air box.

This may have merit because I have used a K&N air filter that is sprayed with K&N filter oil. It is supposed to be washed and cleaned on a regular basis.

If the filter is oversprayed with K&N oil it may do what solex mentioned.

The oil could get into the TB or the ICV/ISV and clog up passages.

Bad AOS seals could do the same and blame could be placed on the K&N air filter.

Now I will go out and clean my K&N air filter....

John_AZ

[Gary2397]

You can buy the K&N air filter panel stock replacement at AutoZone and
try it out to feel the difference between the stock and K&N. If you are
not convince that engine breath easier and its performance greatly
improve, return it to the store in its original box and get your refund
after test drive.

I used it on my 1983 Porsche 944 NA since 1995. The filter is already
pre-oil that will last to 30K miles or more before cleaning.

[Paulyy]

I have a K&N pod filter on my turbo, i did notice some dust particals in the intake pipe, but my filter was dirty, that reminds me i need to clean it again

[solex3274]

I don't want to pick on K & N, or any other filter, but according to this source the stock air box setup results in better performance for this application. The reason is that the air box provides a source of cooler air, the performance filter only sucks in hot engine air.

[John_AZ]

Originally Posted by jonvo

Stock air box is supposed to be the best. It's a cold air with a large surface area filter.

Cold air intake?

Originally Posted by solex3274

I don't want to pick on K & N, or any other filter, but according to this source the stock air box setup results in better performance for this application. The reason is that the air box provides a source of cooler air, the performance filter only sucks in hot engine air.

jonvo had it right. solex is referring to the K&N CONE

[flash968]

intake temp and surface area determine the largest part of whether or not any filter works better than another for power - all other things being equal, put a bigger filter in a colder spot and the engine will perform better than with a smaller filter in a warmer spot

[krystar]

Originally Posted by Rasta Monsta

We need a sticky thread at the top of this forum.

HOW CAN I GET A BIG, CHEAP, BOLT-ON HORSEPOWER BOOST FROM MY 2.5 NA?

Answer: you can't.

yea there is. giggle gas