Air supply to air box

Strange issue for me this one.
I decided to install a pipe from air box to flexi pipe coming out of the inner wing on my 1.8 Freelander 1 as it was awol and due to some fording and puddle chasing my airbox was getting water in and also the air going in was from directly behind the radiator meaning hot not cold air in so changes afoot.
I connected pipes together and it almost stalled the engine.
test drive was worse as though the engine was starved of air.
removed the joint pipe and no issue.
stripped out the inner wing etc and removed a black box from behind the bumper which the flexi rubber pipe ran to thinking it may be clogged but upon inspection it was in fact AIR TIGHT no inlet no blockage just air tight.taped the airline in to it and it expanded the black box but no air came out.
Not to be beaten I simply modified the air box pipe to extend up to just below the bonnet ready to install my snorkel kit I am building so short term it's kind orlf rectified.

Big question remains.....what's the bloody point in the black box in the inner win?
I read on here it was the cold air feed But is it?

Thanks.

That black box is a resonator for the induction set-up. You could do what I did for a CAF:





It's all 65mm PVC spouting down pipe and glued together. The pipe fits neatly up through the hole for that resonator box!

htr said:

That black box is a resonator for the induction set-up.

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Coo lor lummee! You learn something every day. I've heard of tuned exhausts, but not a tuned intake!

I take it this is on a non turbo engine yes?

Yes a fairly st'd k series 1.8. The head, inlet and exhaust sides have had a bit of work amongst other things.

lenny1234 said:

Coo lor lummee! You learn something every day. I've heard of tuned exhausts, but not a tuned intake!

I take it this is on a non turbo engine yes?

Click to expand...

It's pretty common these days to have a tuned resonance chamber in the inlet. It can boost torque asked set points in the rev range and reduce induction noise too. The 1.8 Freelander has 3. Two small closed tubes close to the throttle body and one larger chamber in the inner wing

That looks really well.
I extended mine up for now out of the same stuff as didn't have as many bends kicking around as I thought.

As for the resonator- where should the air inlet be?

That resonator doesn't have an air inlet, only the connection where it goes up to the air intake. That's why when you connected you CAF pick-up to it the engine struggled to breathe.

Right then guess I had a pipe missing.
Cheers for that.
redundant now as am snorkeling it.
Cheers all