morganabowen

My '91 S-4 had been running poorly lately , and finally took it to the wrench. We changed several parts, and none of them made any difference. I finally called Dave over at 928Specialist. After discussing how my car was behaving, he asked me if I had a K&N air filter, and I responded yes. He immediately said the problem was the Mass air flow sensor . It seems the K&N air filter is not the best air filter for the 928 . I'm only posting this to warn my fellow 928ers before they spend the big bucks on the K&N air filters. I'll let you know how my car runs once I change the air filter and mass air flow sensor

tv

Thats been around in certain 928 circles for a while. Supposedly the oil gets on the wire. I was wondering what filters DR is using in his set-up for the superchargers. When i saw the pics i thought k&n.

Vilhuer

Oil used to lubricate those filters kills measuring wire in MAF. Has been discussed here many times.

morganabowen

Yeah, but it is one of those things that needs to be reposted occasionally, for the newbies, and for those like myself that need to be hit over the head with a hammer

Imo000

True, but only if the filter is over oiled. I ran mine for almost 4 years and had no problems. Never the less since it was proven that the K&N yields no HP gains, might as well go with a stock one.

DR

TV,

>Supposedly the oil gets on the wire. I was wondering what filters DR is using in his set-up for the >superchargers. When i saw the pics i thought k&n.

Too funny, I wondered how long it would take for some one to notice and bing that up!!

The main reason I see that the problems are so dramatic with the K&N filters in a stock 928 is that it is directly above the MAF and any oil from the K&N filters will "drip" (on a microscopic level) directly on the MAF. The Modified K&Ns currently in my SC system are a long way away from the MAF and are not above it. I have been monitoring the MAF closely for any oil contamination and so far I do not see any. We are also considering the "Green Filters" for our production kits as they seem to be a better filter anyway, it is a matter of getting them to make the correct size for us.

BTW, 9 out of 10 tech calls I get concerning MAF sensor failure problems are from 928s with K&N filters... you be the judge.

DR

Oh, I have an even funnier story concerning 928 K&N Filters!

I just bought a New Ford F-150 Supercrew with the FTX "Tonka" Concept truck package and it has a custom Dual Ram Air Hood.

Take a look at the Filter and see if it looks familiar...yep, it is a 928 filter!!

BTW, thanks Tom for the spare K&N for the truck :-)

Jim bailey - 928 International

Perhaps a more accurate statement is mass air sensors ALL GO BAD. Some cars which have K and N filters have had mass airflows fail. Each and every time you drive, on shut down the mass air wire is heated to red hot to burn off any impurities glows for about 1 second after a 4 second delay. In my opinion , more cars with stock air cleaners experience mass air flow failure than cars with K and N filters. Simply because more cars run stock filters !

tv

DR - I noticed the filters as soon as you posted the pics of those great looking kits, but i didn't want to introduce any negativity on such a fine effort. Are there any oil-less cone filters out there?

That truck looks awesome, does it use gas?

Is that blue filter 928 compatible? I have wanted something better like a fram airhog but there are those here that will say the stock flows as good as any.

tv

Hey JB for some reason i always have to SOS the rack on my BBQ even though it gets real hot there.

FlyingDog

DR, I though your ram scoops were 'dummies'?

tv, yes there are oil-less cone filters, but they don't seem to be made in as many sizes. K&N's ad hype has worked. One of my friends had an Exploder that imploded a couple aftermarket paper filters so he switched to a K&N. He very noticably lost power and the thing became very dirty very quickly both on the filter and past the filter in the intake tube. After having the K&N replaced he had the same problems. Finally he gave up on the K&N and went back to a factory paper filter. Power came back, filter stayed cleaner longer, and intake tube stayed clean.

Jim bailey - 928 International

Use K and N oil on the BBQ grill see how that works... your grill glows red hot ?

the flyin' scotsman

Dave.............any market for trading our slightly used 928 K&N air filters for some useful components? Perhaps w can stike a deal with Ford themselves.

James-man

I have had a K&N for nearly 10 years and my MAF has not yet buggered out. Not to say it isn't struggling... I simply don't know as I haven't tested it.

At the next dyno day I might run K&N versus stock. The neat thing about K&N is that you can thoroughly clean it whenever you want to, like, right before a dyno day. Stock filters you can try to blow out particles, but it is not the same degree of clean. I wonder how a K&N would do against a new stock orange filter and then against a used stock orangish brownish filter. You can bring a K&N to as new. If you want "as new" with orange filters you gotta keep buying new ones - a whole lotta them.

How often do you replace the oranges? Annually?

Dave Howerdel

Funny how these things hit all of us at the same time...


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