Air filter replacement issue - K&N
11-02-2018, 01:17 PM
#1
Air filter replacement issue - K&N
I have a Fabspeed intake, and one of the filters needed to be replaced. I put on a K&N filter I got locally - and after a week or two started getting engine codes. After spending a bunch of cash - it was found that by putting the old Fabspeed filter back on made the codes not happen. Specifically, codes P0172 and P0175.
just wanted to post this in an effort to stop someone else spending a pile of money and frustration on the same issue. If anyone wants to know, I can post the K&N model #. Maybe I bought the wrong thing out of ignorance.
Apologies if this was covered before, I didn’t see anything.
just wanted to post this in an effort to stop someone else spending a pile of money and frustration on the same issue. If anyone wants to know, I can post the K&N model #. Maybe I bought the wrong thing out of ignorance.
Apologies if this was covered before, I didn’t see anything.
11-02-2018, 01:45 PM
#2
Rennlist Member
interesting. Subscribed. Would love to see Fabspeed weigh in. I have the FS wishbone config. I just cleaned and lightly re-oiled mine.
11-02-2018, 02:12 PM
#3
My sad assessment is it a porsche tolerance/K&N filter issue. Fabspeed has a solution inside Porsche tolerance... but what do I know... I am the sucker that just paid a huge bill to find out he bought the wrong filter! Probably K&N has one inside spec - but wasn’t the one I got.
11-02-2018, 03:37 PM
#4
Rennlist Member
It never ceases to amaze me that in the unending quest for "more" of everything,
people take risks that are not really paying off. Porsche has wrung out all possible
power out of the 997 engines. Nothing short of an expensive "tune" will increase
power. All the gimmicks in the world won't help and most of the time are incompatible.
If an oiled air filter led to hp increases, Porsche would long ago have adopted them.
It really is that simple.
people take risks that are not really paying off. Porsche has wrung out all possible
power out of the 997 engines. Nothing short of an expensive "tune" will increase
power. All the gimmicks in the world won't help and most of the time are incompatible.
If an oiled air filter led to hp increases, Porsche would long ago have adopted them.
It really is that simple.
11-02-2018, 05:26 PM
#5
It never ceases to amaze me that in the unending quest for "more" of everything,
people take risks that are not really paying off. Porsche has wrung out all possible
power out of the 997 engines. Nothing short of an expensive "tune" will increase
power. All the gimmicks in the world won't help and most of the time are incompatible.
If an oiled air filter led to hp increases, Porsche would long ago have adopted them.
It really is that simple.
people take risks that are not really paying off. Porsche has wrung out all possible
power out of the 997 engines. Nothing short of an expensive "tune" will increase
power. All the gimmicks in the world won't help and most of the time are incompatible.
If an oiled air filter led to hp increases, Porsche would long ago have adopted them.
It really is that simple.
The best improvement you can do to a Porsche is to improve the driver! Get a few high speed classes and some tracks days with an instructor. The car is way more capable than any of us will ever be.
Yves
11-02-2018, 05:28 PM
#6
I don't disagree, but I bought the car with it and it didn't come with the factory intake in the frunk.. so I, and undoubtedly others, have the problem/concern unless they want to shell out more cash to get it back to stock.
T
T
11-02-2018, 06:23 PM
#7
Rennlist Member
I do disagree with Ogun's sentiments. This is an unending debate, however, and one side cannot ever convince the other. It is like politics. Porsche designs for specific goals, with gas mileage being one of those primary goals, which always overrides performance. So the aftermarket thrives with things that allow the owner to obtain the additional performance metrics that the manufacturer leaves on the table. Except for true super cars, every manufacturer does this. In short, even a CAI and tune add hp and torque. Believe it or not.
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11-03-2018, 12:57 AM
#8
The slightly odd thing with the codes issued is that they are indicating a rich mixture (Bank 1 and Bank 2), which would be strange for a low restriction oiled fiber filter like K&N on the MAF side, but maybe a bit of excess light oil is being drawn into the intake and not burning resulting in high readings of "unburned fuel" on the exhaust side. If you allowed the filter to off-gas for a while (not on the car), I think it would probably eliminate the issue.
11-03-2018, 09:22 AM
#9
..nice. ok.. it is off the car now, I'll get it out of the box and leave it for a month on the shelf, and give it a try. The weird thing ( and why I wasn't smart enough to figure it out) is that it didn't throw the codes for about 3 weeks after putting it on. I had assumed that K&N was less flow then the Fabspeed, and a bit of gunk started fill up the filter and it went out of tolerance.
11-03-2018, 09:57 AM
#10
Rennlist Member
Interesting. Is this a .1 or .2? I have had K&N's on my 997.2 C2S since I bought it March 2017 and it never threw a code or ran rough. Have put about 6k miles on.
11-03-2018, 10:00 AM
#11
Rennlist Member
11-04-2018, 01:58 AM
#14
RL Community Team
Rennlist Member
Rennlist Member
I have run K&N filters both as part of an open CAI and as replacements in my OEM airboxes for 30 years in a carbed 914, supercharged 928, two 997s, a GMC Truck, a Saab Turbo, an Indmar Marine Engines, and a Cayenne Turbo, and the filter has never caused me any runnability, filtering (I get low silica levels in my UOAs), and I've never replaced a MAF due to oil contamination. All of these vehicles have modified motors which is why I went to an aftermarket intake in the first place, and I run them with a K&N Hydrophobic pre-filter on them as well so that if driven in the rain, the filter media doesn't become saturated with water. The trick is to not overoil the filters when cleaning and reinstalling them, and IMO, a brand new filter that comes from K&N is actually over-oiled when you remove it from the cellophane wrapper.
You can search for some of my posts on this topic that include copies of my UOA reports from different vehicles.
You can search for some of my posts on this topic that include copies of my UOA reports from different vehicles.
11-04-2018, 08:40 AM
#15
Rennlist Member
997.2 intake from fabspeed uses afe brand filters. They have a proprietary part number but you can get an over the counter with the same specs.
afe-21-30016
I run these with no issues.
afe-21-30016
I run these with no issues.