Modification to standard Air Box - Will it work better?

[RocketRossUK]

Hey up guys,

Was looking under the hood today. I saw the intake side of my airbox and started thinking that looks a bad design.

Ok, so im no intake engineer and im sure the VW spent some time on it, but if you look at the picture below, the intake end had 3 different section where it can pull air through. One at the front, one at the back and one at the bottom.



So that gets me thinking, is that not pulling a lot warm air from the engine bay, and having that amount of holes cant give much suction pull.

Fair enough it will get a lot of air, but it will not all be as cold as it could be.

So i decide to use a CD sleeve and some good old electrical tape to mask the top and bottom air holes up and just leave the front section open where it pulls in air from outside the car.

Bad picture i know - this is it 2/3 sealed up.



So i popped it back in the car, took it for a run.....

Very hard to say if it made a difference, it seemed to really pull, but that could be because the air is cooler on a night, placebo effect, having it mapped last week......etc

So you guys who are running standard intake, what do you think of the standard intake, was it designed like that to keep it quite or for performance?

[Poached]

Nowt wrong with the stock intake imo, it sits at the front of the engine drawing in the air from outside which is more than can be said for some of these aftermarket intakes you see that flop inside the engine bay.

[wigit]

VW revised the top of he intake to be open, on first roccos they were closed, taping up the rear makes no difference as we did this for a laugh at VWR over four years ago when we were a bit bored

[RocketRossUK]

VW revised the top of he intake to be open, on first roccos they were closed, taping up the rear makes no difference as we did this for a laugh at VWR over four years ago when we were a bit bored

any reason they opened the top of it. it just seems like there would be no really pull for the cold air having it open at all side.

[andygo]

I would have though the larger the intake hole the more air can get in. Remember the air flow is limited by the aperture of the inlet near the MAF.