DIY: Extra air to stock airbox

wstar

I think it would be hard to tell whether that was helping or hurting. It probably depends on the effective pressure differential between the main openings and the tube openings. They're both going to get a little pressure bump from being in nose cavity. If the tubes get more pressure than the main openings (or even the same really), I could easily see the sideways airflow from the tubes disrupting the flow of the main inlet and leading to overall loss. Could be that in the end it actually helps flow though. It's just sort of impossible to know unless you can replicate real conditions (XX mph airflow onto the whole face of the car) and actually measure the difference in airflow (MAF sensor maybe?).

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TreeSemdyZee

Be VERY careful driving in the rain. I had the bumper tube on my 350z and sucked water into the engine and killed it. Mind you, there was massive amounts of rain at the time (6" in a few hours), but it's always something to be leery of.

Mandingo

Thanks for the heads up. I feel like airflow would be %100 coming through the large main inlet once the small tube saw any kind of restriction from water. The path of least resistance would become the large stock inlet up top instead of sucking water up the little hose like a straw.

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CDepp

Negative, Ghostrider.

You can never suck that much water up the hose to kill the car unless you have deleted a bypass. Water is denser than air and you'll always avoid pulling water up if air is allowed to get in through the bypass. To accomplish this, you'd have to submerge parts listed: 5, 6, 11, 21.

And, as some of the older generation turbo-nuts here know, you periodically want a spray of water in an engine to 'steam-knock' carbon buildup off valves. I've even seen technicians take a spray bottle of water directly to the throttlebody inlet. Old turbo-prop planes would blow water into the intake to do this.

Something else was going on with your setup.

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-CDepp-
2011 MB Base+S M6 | Invidia Exhaust | TommyKairaHebiBeibi | H&R Spacers 15/20 | GTR Start | 305hp/240tq

Mandingo

Thats true. The whole time I was working on this I was thinking about how both inlets would have the same pressure being inside the nose. There could, however, be a difference in pressures at each inlet as you said. I know very little about fluid dynamics so I'm not sure how the sideways flow could affect the flow in the airbox at speed. I need a wind tunnel with a dyno inside

Like I said, I'm pretty skeptical when it comes to using the ole butt dyno. I must say though, it really doesn't feel like I've lost power anywhere. If anything, it seems a little stronger on the highway when trying to pass.

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