K&N cold air intake

James Chimney · James Chimney's Garage

I used a K&N RC-5052AR cold air intake and K&N 85-6001 adapter and re used the Gromit from the OEM air box snorkel where it goes into the fender well, PO just had an exposed filter in the engine bay, I have the OEM air box but like the room under the hood. More photos available, as it does sit a bit of an angle[IMG]

[/IMG]
[IMG]

[/IMG]

911tracker85 · 06-09-2016, 05:15 AM

hate to be debbie downer, but I have reverted all of my cars to stock paper air filters. even on the 450hp build I am doing for my 930.

kept seeing comments and did some research. unless you have some monster motor build that needs huge amounts of air, the K&N does not really improve performance.

and from a couple engine builders, they say they can tell if an engine had a K&N by the fine scouring of the cyl walls as K&N can allow fine dirt/dust to get by.

YMMV

but good work on what you did.

flash968 · 06-09-2016, 06:18 AM

i've dyno tested a few K&N filters on a different cars, and they all showed power increases. on the 968, it made about 5hp. it is critical though that the filter be separated from the hot engine bay air in order to get that increase.

as for dirt getting in, if the filter is PROPERLY oiled, it works just fine. if it is dry, dirt gets in. most people don't take care of the filter. it has to be regularly cleaned and oiled.

no free lunch

Rasta Monsta · Rasta Monsta's Garage

Interesting, that is the first aftermarket intake I have seen for a 944 that actually makes the effort to get cold air.

v2rocket_aka944 · 06-09-2016, 07:23 AM

When developing the "NA-tune" plug-and-play MAF kit for the 944, Rogue_Ant did back to back testing with a standard paper filter, a K&N filter, and no filter at all installed in the 944 air box...absolutely no power difference.

So on a 944 setup it doesn't do anything...but a 968 is a whole nother story.

Quote:

Originally Posted by flash968

i've dyno tested a few K&N filters on a different cars, and they all showed power increases. on the 968, it made about 5hp. it is critical though that the filter be separated from the hot engine bay air in order to get that increase.

as for dirt getting in, if the filter is PROPERLY oiled, it works just fine. if it is dry, dirt gets in. most people don't take care of the filter. it has to be regularly cleaned and oiled.

no free lunch

v2rocket_aka944 · 06-09-2016, 07:25 AM

When I ran the ROGUE MAF kit I logged intake air temps with a cone filter in place of the airbox, and then relocated over in the fender hole...

IAT only climbs when sitting still. As soon as the car gets moving the IAT is ambient within a few seconds.

Quote:

Originally Posted by Rasta Monsta

Interesting, that is the first aftermarket intake I have seen for a 944 that actually makes the effort to get cold air.

PHillary · PHillary's Garage

What kind of K&N cold intake is that? did you make it? part numbers please? Some people say the stock box is more than enough some people just like looking at aftermarket parts in the engine bay. I would like to at least try out this K&N filter that is under that hard plastic casing going directly to the fender. I think this would produce some cold air or at least shield it from hot air.

PHillary · PHillary's Garage

Sorry about that, didn't notice you posted the part numbers at the top of your post. Thanks.

flash968 · 06-09-2016, 02:59 PM

one of the key issues with any cold air intake and its ability to add power, is to ensure that the surface area of the filter is AT LEAST as large as stock. that filter in the first pic is almost certainly smaller than stock, and likely costs power. in the case of the 968, they make a direct fit filter, so it was easy to test and verify the increases.

i have seen even larger increases in my 06 yukon and 98 grand cherokee. other cars were easy to feel the difference, but i didn't test all of them. i've been running them on every car i set up forever, and would not think twice about it. it's almost the first thing i do, because it works, and in over 30 years, i have never seen any down side, when properly maintained and installed.

again though, the application is critical.

v2rocket_aka944 · 06-09-2016, 04:20 PM

Sounds like a "total flow area" question then?
If the filter is big enough then the substrate may not matter so much (like the 944NA has a big filter).

But if filter size is limited by packaging, then a higher-flowing filter should let the engine breathe better.

I wonder if 944S2 K&N is worth anything...those things have a HUUUUGE filter.

Quote:

Originally Posted by flash968

one of the key issues with any cold air intake and its ability to add power, is to ensure that the surface area of the filter is AT LEAST as large as stock. that filter in the first pic is almost certainly smaller than stock, and likely costs power. in the case of the 968, they make a direct fit filter, so it was easy to test and verify the increases.

i have seen even larger increases in my 06 yukon and 98 grand cherokee. other cars were easy to feel the difference, but i didn't test all of them. i've been running them on every car i set up forever, and would not think twice about it. it's almost the first thing i do, because it works, and in over 30 years, i have never seen any down side, when properly maintained and installed.

again though, the application is critical.

James Chimney · James Chimney's Garage

Quote:

Originally Posted by PHillary

What kind of K&N cold intake is that? did you make it? part numbers please? Some people say the stock box is more than enough some people just like looking at aftermarket parts in the engine bay. I would like to at least try out this K&N filter that is under that hard plastic casing going directly to the fender. I think this would produce some cold air or at least shield it from hot air.

KEEP in mind this set up is very tight, and I had to sand/grind the outlet of the K&N to sit a bit of an angle to get it to fit between the Coolant tank and Headlight arms. I have the original air box but I like having all that extra space in the bay (It looks nice too with the K&N) I have other photos of the install if needed. will post about how it feels to drive it soon.

flash968 · 06-10-2016, 05:33 AM

it is indeed a flow issue. we tested that with a manometer. it was not at all difficult to see the results. i actually had a magazine article published about it.

944 Ecology · 06-10-2016, 06:12 AM

Quote:

Originally Posted by flash968

it is indeed a flow issue. we tested that with a manometer. it was not at all difficult to see the results. i actually had a magazine article published about it.

What magazine? When?

Can you provide a pdf of the article?

sausagehacker · sausagehacker's Garage

I'd be very interested in seeing a test of the static pressure upstream versus downstream of an AFM (or any other intake component) across a variety of load/RPM sites. Would give an objective look about how much flow velocity is lost due to that component.

v2rocket_aka944 · 06-10-2016, 06:42 AM

You've got a MAP sensor, don't you?

Quote:

Originally Posted by sausagehacker

I'd be very interested in seeing a test of the static pressure upstream versus downstream of an AFM (or any other intake component) across a variety of load/RPM sites. Would give an objective look about how much flow velocity is lost due to that component.

Litesonic · Litesonic's Garage

It looks awesome.

I have been a fan of K&N filters for decades... and have definitely seen the benefits on many cars. I am really impressed by how contained it looks.

sausagehacker · sausagehacker's Garage

Quote:

Originally Posted by v2rocket_aka944

You've got a MAP sensor, don't you?

That little guy has to be behind the throttle body

I'm ordering a 2nd Megasquirt for the 951, and I actually think that would be a cool test I could do with it in "observation mode" while my NA is running.

flash968 · 06-10-2016, 07:41 AM

the article was in 9 magazine. it was about 10 years ago.

v2rocket_aka944 · 06-10-2016, 07:42 AM

Leave it where it is, but log your MAP as you drive now, and then log MAP with an AFM installed "dummy" in the intake tract.

You'll see a pressure drop.

This is the same way I intend to test my VEMS with and without the AFM in the tract for power output...I should be able to do a MAP log too.

sausagehacker · sausagehacker's Garage

Makes sense, it stands in the way of the manifold equalizing to atmospheric. I have a bad AFM I could drill into to make some test ports as well.... Bernoullis law would make it possible to calculate the exact flow loss due to it.

(sorry for OT)