Air Filter Housing Restriction - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Lil bastard · 09-28-2008, 01:56 PM

Except that the Boxster doesn't use a Hot-wire sensor... it uses a Hot-film sensor similar to mylar, it is conductive and so can be heated. It is not however self-cleaning - at 1800 degrees, the film would simply melt.

blue2000s · 09-28-2008, 03:06 PM

Those screens have no discernible effect on the airflow through the intake. Removing it may make you feel like you've done a free mod, but really, it had no effect on the engine that you will ever notice. Send it to me and I'll put it on my flow bench to prove it to you.

This type of screen also is not used as any kind of a "flow conditioner" for feeding into the MAF. Screens that serve that purpose need to have "depth" in the direction of flow like a honeycomb-type screen.

My only guess is that this screen was added to prevent large particles from being ingested by the intake. I agree, that it's impossible for something to make it that far into the intake if the rest of the system is intact, but there must have been some significant "what if?" scenario that Porsche saw fit to protect from.

Send me a PM and I'll send you my address. You can put it in an envelope and I'll bench test it.

Jaxonalden · 09-28-2008, 04:00 PM

Will do, but first...I have my stack with the screen removed in now. You want to use the stack with the screen? Or do you just want the screen I removed so you can just wrap it around a tube that you already have base-lined?

LB,

I just compared the pictures of the OEM and the one in the article I read. Seemed the same one to me...I use the E-Gas model...especially after eating Mexican food.

Jaxonalden · 09-28-2008, 06:55 PM

For those interested, I'm sending Blue2000s my cutout screen in the morning and we should have flow bench results in about a week. I was just thinking, Blue2000S, if you use a clear tube can you light a cigarette or something that smokes and report on the looks of the airflow aft of the screen?

Thanks for taking this on for the forum.

Lil bastard · 09-28-2008, 09:27 PM

Quote:

Originally Posted by Jaxonalden

LB,

I just compared the pictures of the OEM and the one in the article I read. Seemed the same one to me...I use the E-Gas model...especially after eating Mexican food.

FYI, here's the description of the MAF from the DME Motronic 7.2 (E-Gas) Diagnostics manual:

"Mass Air Flow Sensor

The mass air flow sensor is installed between the air cleaner and the throttle valve, and measures the mass air flow taken in by the engine. An electrically heated platinum resistance film is cooled by the air flow. A control circuit corrects
the heating current in such a way that the temperature of the resistance film rises constantly in relation to the intake air temperature. The heating current is then a means of measuring the mass air flow. With this method of measurement, the air density is also taken into consideration, as it helps to determine the amount of heat emitted from the heated body into the air. A temperature sensor is integrated for measuring the intake air temperature."

Jaxonalden · 10-04-2008, 09:55 AM

Blue2000S has my old screen and will conduct the flow bench check through the screen next week he said. In the mean time, I've got a flow meter that I use to balance my sand rails twin 44 IDF's. I was thinking that I could put my snorkel back on and place the flow meter on the snorkel and measure the flow rate at idle. Then install the intake screen and read the meter again. There should be a delta, and that delta would be the restriction, at idle.