Abby Normal

A cold air intake would not be very hard to do. Someone should take the point on doing one!!! It would by no means be rocket science to design. The design that I will be using for the Superscharger comes to mind and a K&N already exists for the fit.....
Would like to see someone give it a shot!

John Struthers

Greg,
Does make you wonder how the elephant got thru the keyhole. Some of the stuff simply has to be dropped in by 'US', some from the box edges/bad seal, and some of the fine stuff through the element of any filter. But the stuff on the MAF screen that's plain scary and needs to be cured.
When did that "Hand me down my walking cane:
Hand me down my hat... " the rubberband man song come out? It may have influenced the Germans and the 928 filter retention system.
While I do like the idea Carlos, you, and others suggest of a cold/pipe filter system
there was a post about cutting the intake pipes on page 4 that fanned out into, practically, an engineering paper with some good poop on the intake system. Covered everything from ambient air temp.,cool air VS warm for efficient combustion,to noise abatement rules in Germany that might have some applicable impact on the design and installation of the system under the sHARk hood. Experimentaion is in order Herr DocKtor

Ed,
Thanks for the Dyno update but flowing air more efficiently didn't improve HP ANYWHERE?
Yikes! Hey I noticed on your 7july post to that intake post above you mentioned raising the box -no! I ain't tying that into the debris debate- Did you have any hood clearance problems? How thick and where did you get that insulation matierial for the tubes?
Sarge,
Thanx for your additional info. Nice looking S4. Is that the stock rear wing? looks good in any case. Honestly, I think I have on ocassion accidently knocked a little trash loose when removing the filter.
Abby,
BUT, we were waiting for 'YOU' to do ALL of the hard work.....
Again Tanks all of you.
John S 82' Auto. 'Pattycakes'

2V4V

Ed,

Really, really, really. I DO believe you. I have NO doubt you are telling the truth in your scenario. I also am quite a believer in YMMV (and I know what it means, I too use it often). :-)

I am still hoping some others weigh in on this topic - as John said "stuff on the MAF screen is plain scary" and I would be scared too if I had seen anything resembling that in my car.

I wonder if perhaps the difference may lie in the "lip" around the outside seal of the filter. As I recall (correct me if I'm wrong here) there is a lip on the OEM style filter that is far more pronounced (ie, it protrudes farther) than on the K&N.

As to HP, well that is as YMMV a topic as you can possibly have with ANY bolt-on. You may, or may not gain significant HP with any number of mods. I have done before and afters on a coupla my other cars, and have had mixed results with K&N as a stand-alone mod. So that will probably always remain a (semi) point of open discourse.

(as always) Peace,

Greg

Carlos

While I was out of town yesterday I came to the same conclusion as gryron. I think the rubber bands may be a large part of the problem. Before I spend $120 to replace them I'll be engineering some kind of replacement. Hell spendng $120 on rubbers should result in more fun than that.

Abby, mention it to Marcus next time you talk to him.

Ed Ruiz

I only raised the filter box 1/4" and there are no clearance problems. I found some thin rubber sheets that I cut to fit. I'm looking to replace the rubber with thin (aluminum) insulation which I think would work much better. YMMV.

Abby Normal

John,
I would love to be working on mine!! Because if I could that would mean my engine would be in my car instead of California..

GFoster

Have you ever wondered why K & N makes a filter for the 928....Jerry Mall the owner ownes a 928 ...Jerry and his sons and the rest of K & N people are real people and really do not need to hype a filter for a low production automobile...Just thought you might want to know.
Gary Foster

Carlos

G I sure wish they made a cold air kit so we could get rid of that lame air box.

John Struthers

I suppose the air box/K&N issue will never
never die a peaceful death with testimonials running both ways and don't forget the rubber band issue.
BUT,

When the Porsche folks tell you in the OWNERS MANUAL to CLEAN the intake box I REST MY CASE.
Carlos I am still looking around for some prefabed shapes to use as the foundation for a HI Flow cool air system. Space is at a premium under our hoods and a large volume central box seems to be the way to go. Any of you flow dynamics type jump in here:
1. Would it be better to remote mount the box with the possible attendant problem of air leak/vacuuming dirt aft of the relocated box?
2. Is there an appriciable/measureable loss of air flow velocity, and volume compared to stock system if you mount the new box and filter well forward of its current location?
If so, what is the advantage of the closed snorkle systems available for a variety of vehicles from a number of vendors, HYPE?
John S. 82' Weissach, Auto. 'Pattycakes

Carlos

A cone is the answer. If we can get a tube & a cone we should be much better off.

TJQuill

Hey Guys - Ed, you said that you "modified my straps so that they provide a tight and good fit over the filter" - just curious as to what you did as mine could certainly use a little tightening.

Anybody else out there have a fix or a non-OEM replacement?

For whoever's counting, I have a shiny new OEM filter and I have found chunks of bugs and other debris too large to fit through the filter in the bottome of my air box.

I've been on the email list for almost two years now, but just discovered this board - much more contentious over here.

Ed Ruiz

All I did was place some insulating rubber foam (1/8" thick) between the straps and the air-filter cover. That added amount keeps the straps tigthly in place. YMMV.

W.A.Mozart

About cover straps: they go 2 ways. The conventional way, and the opposite way, in other words folding the clip under itself instead of over. That method provides a good deal more pressure, and I find it holds my filter down better. Of course it too will stretch the rubber and in the end, need Ed's method, or a replacement.

FWIW I have seen several sharks with the filter box top not properly on. This is more common in 928's with good engine mounts since there is so little room at the firewall to see if there is a misfit. Just an observation. I run K&N on one S4 and on another, stock (I have 2), and I find no difference at all except that the K&N edge is harder and isn't easily damaged. Best regards

Rich

Pulled my K&N last weekend. The box was clean as a "whistle." Found a nice chunk of wet leafy !@#$ that the K&N handled nicely, not even a drop of water in the box. With the 928 nose acting like a super vacuum cleaner, I can only suggest checking strap tightness and cleaning the filter OFTEN. I'll stick with my K&N for now.
Rich
'82 928

Darren '85S

Since, we are beating the dead horse (BTDH) , I have found stuff under the stock filter such as leaves. It was probably due to me being careless when putting the filter housing back together. On mine, if I'm not careful the lip of the upper housing will slip over the filter. Anyhow, here is an interesting solution that has been installed on 928s http://www.electricsupercharger.com/. Someone needs to integrate it with a cold air system.