Simply questions to dispell all the theories floating around here in regards to the airfilter. Those airfilters will clamp directly to the opening on the turbo. So if the turbo can only suck the amount of air that will go through the hole in the turbo and the filters are larger than that how can it be restrictive? On the other hand we make a huge hole at the front of the air box that allows in more air than the turbos can use but we put in a flat filter that won't flow as much air as the turbo can pull through them, that is better? I don't understand the logic there.
Simple area comparisons do not apply when there's a couple screaming turbos in the mix.
Apples and oranges.
And there ain't gonna be no "air can move slowly in an unconstricted manner to the turbo inlets" pace. Except maybe at idle. It's gonna be pandemonium..
Sorry Carl, I wouldn't use that on a mild n/a engine.
Since you've modified much of the car anyway, you might as well start considering getting air in through the hood just above turbos.
This is the thing about the air filter entries into the airbox that's nagging at me.
All "cross sections" are not equal. That's where calculators lie to you. When air is flowing straight it does not need as much cross sectional area as air that is turning. You get much lower cfm per square inch of area when the air is turning, as in the photo of the air filters/airbox junction.
If you go back and look at how the air from the filter enters the airbox you can see that there is a sharp 90 degree turn that has to be made. If there were some big radii there it would help the air make the turn without losing so much velocity. Another filter would lower demand on each entry too.
This is the thing about the air filter entries into the airbox that's nagging at me.
All "cross sections" are not equal. That's where calculators lie to you. When air is flowing straight it does not need as much cross sectional area as air that is turning. You get much lower cfm per square inch of area when the air is turning, as in the photo of the air filters/airbox junction.
If you go back and look at how the air from the filter enters the airbox you can see that there is a sharp 90 degree turn that has to be made. If there were some big radii there it would help the air make the turn without losing so much velocity. Another filter would lower demand on each entry too.
Exactly!
I'm no fan of the airbox and would run straight filters.
The problem is all the plumbing that goes into running straight filters on the front mount system. The air box is a great idea it just has a few bugs that will need worked out. My suggestion would be to put a box on the bottom of the air box where the filters mount. It could have a radius pc on the back side and allow the air to travel an easier path.
I am sure Carl will get this figured out. He has done a great job so far.
I just would fear hydrolocking the engine after sucking in lot of water when driving in heavy rain (damn heravy rains can happen here even after leaving at perfect weather.....)
Last edited by Austrian Viper : May 31st, 2008 at 11:38 PM.
I just would fear hydrolocking the engine after sucking in lot of water when driving in heavy rain (damn heravy rains can happen here even after leaving at perfect weather.....)
Just dyno the car and run the heck out of the car at the track. If it meets all of your expectations, don't even mess with the current airbox setup. Good luck.
