PC-85-928S

Anyone ever remove the air intake tubes, and the air box, and run a cone style K&N Filter directly to the MAF?

What size and style fit?

Any difference in performance?

http://www.knfilters.com/universal/universal.htm

SeanR

Why would you want to? Hot air, more dirt, don't see any benefit for doing so.

joejoe

k/n oil can foul the MAF best not to use.

PC-85-928S

For a cleaner look
On an S4 you can actually see your powdercoated cam covers.

It is close to the base of the windshield.
Isn't that supposed to be a good area for air intake?

If the filter was tilted, the oil may not drop onto the MAF,
If you oiled it that much.

SeanR

There is a seal in between the engine and the windshield with the hood closed. You get cold air from the front of the car. Consider it a well designed cold air intake that was designed in the early 70's.

While it might look cool what you are proposing is going to do way more harm than any good that can be thought of.

Bilal928S4

Come on. How difficult can it be.
Just cut a whole in the hood and let the K&N cone stick out. Optimum location to get the fresh air.

geschwindig

PC, just buy some clear, see-through intake runners. Then you will see that when the motor is RUNNING, nothing "drops" into the MAF...it's sucked in at high velocity, K&N oil included. But, at least you will be able to see those beautiful cam covers! (Sorry, couldn't help it...)

M. Requin

This is just as much fun as "which oil"? I've been using the K&N that came with my 86.5 for the last 50K+ miles with absolutely no ill effect. BUT: I was a motorcycle dealer when K&N's became big, sold a lot of them, and learned that the cardinal sin in their usage is over-oiling them. You almost can't use too little. My car has 188K on it, and using maybe 1/4-1/2 cup of oil between its annual oil changes, and it is my DD with approx 8K miles a year, including very dusty ones (i have a farm,and that, BTW is why I stick to the K&N - Roger could retire on what I would pay him for stock filters over the years). YMMV.

geschwindig

Martin, you're absolutely right. People frequently just over oil them after cleaning. I still use them in some of my motorcycles, (I even over-oiled one last year and had red oil leaking out of the air box for days thinking I had a top end leak..), used one in my 79 928. I use stock now after considering the MAF contamination issues possible on the newer cars and the dyno tests I have read that show little or no improvement for a street engine. I always used the K&Ns in the dirt bikes for the dust reason you alluded to. Nice to see another veteran motorcyclist here. Is that your Velo?
Kevin

M. Requin

Kevin, that's a stock photo, but identical to mine (which I raced in the Alphabet until I bent it too much. The fishtail - with a big kink in it - still hangs in my shop). Also had a '48 KSS. Cool old English company, with, like a lot of them, some pretty strange ideas!

I would use a standard air filter except for my environment. I live down a gravel road, and the drive into the farm is .2 mile unpaved, so it's just not practical. This place is so dusty that when I built a new PC this year I put cleanable air filters on the intake fans (not K&N!) and used fan controls to keep positive pressure in the case, all for dust control. But that said, in >50K miles, total of 188 on the clock, I have not yet had MAF issues. Please note the "not yet."

BTW that bike of yours is some beast!

mark kibort

I did this. with a very high end cone filiter with an internal bell mouthed inlet. looked like it would be the ultimate in any potential gains............................net loss 5hp.
the stock air box is UNIQUE and very good, not only at flow managment, but grabbing higher pressure from the front of the car. I have mine vented from front and rear because its a race car, and I can.
stock car's setup wont really allow you to do that.

928mac

I use mine for around town and did not plan to get one for full time use.
The hot air under the hood and the loss of the forced induction will hurt the HP.
I do not believe that they filter as good as any factory filter as the factory spends millions on R&R, and also, the K&N filter was designed for less resistance first and filter second.

SO why is mine still on
see where I put my fuel pressure gauge, now I will have to mod my stock filter box and have not got to it yet.

BTW I do not have a MAF sensor, it use a GM map and temp sensor

whatudrivin

I thought it wasn't advisable to run a fuel pressure gauge full time?

Randy V

It's not.

whatudrivin

I remember seeing those pictures.... Be leery of this 928mac, I would hate to see a nice car be ruined over something like this.