Subaru Outback Forums banner
1 - 2 of 2 Posts

·
Registered
Joined
·
95 Posts
could be emissions related? - fuel supply will automatically adjust to available air supply based on exhaust O2, and an intake restriction effectively changes the range that the fuel system ideally operates across. idunno, seems like a weird way to restrict flow if that was the goal...
 

·
Registered
Joined
·
95 Posts
In this point, if fuel adjust to air, then both are burning so emissions would be moot. This effectively chokes the system as it reduces the area it can readily pull air from.


In this one, this "nozzle or snorkel" for lack of better description, was mounted in such a fashion that the flush rounded end was inside the throttle body's tube, coming out and up at an angle so that the angled end sat flush and in contact with the element. If somehow despite all engine design the element got wet, much less enough so to interfere with the engine, this snorkel would assuredly suck moisture through and off of it.

Genie from "Aladdin" comes to mind. "GREAT BIG AIR BOX!. little bitty sucking space."🧞‍♂️

Noise reduction may be it. Unless we get an answer from a designing engineer or someone as knowledgeable to tell, we'll never know. I'm sure we'll have to resort to torture to find out even then.
I started her today, and have to say at the high idle in the cool temps we're getting since I removed it, she does sound a bit more sport car growly like.
until we're running pure hydrogen the cleanest burning engines will still have regulated emissions that scale with fuel load, and manufacturers' fleet emissions calculations will depend on models staying within designated categories
 
1 - 2 of 2 Posts
Top