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[feeutfo]

any pics?

[Albatross]

any pics?

Pics as requested. I think that the answer is (according to the other thread - http://www.omegaowners.com/forum/YaBB.pl?num=1229377845) that it is there to quieten the induction noise and does nothing to the performance either way. I didn't notice any difference in noise actually since I took it out though.

[SP_3.2]

Had a check on my one as it,s only a few mins to remove the Air box lid not sure if it would make a diff but when i checked the inside of the box there was not the 6" of feed at the bottem of the box just flush with the box. Also had a look at the trupet on it and mine has 4 holes on each side ?.

[feeutfo]

woo, dunno what thats for.... dja, bin it. On the other hand they must do it for a reason.
I wonder what vx call it on their system? Maybe that would give a clue, "a pipe" or some useless description probably. I wonder if its some sort of baffle so the bag pipes draw on still(er) air? Maybe...

 Is the intake narrower than the exit hole? I cant picture which way round it goes.
Might have a look later.

[SP_3.2]

Yep it.s narrower on the intake ( inside the box and opens up as it comes out toward the Maf. I did not even know it was there .

[VXL V6]

Vectra's had something very similar in the airbox as well. I *think* it's purpose was to cause a vacuum at the other end of the airbox to the air feed so that a wider surface area of the filter was used.

Still took it out though!

[Kevin Wood]

Hmm. Interesting. Looking at the pictures the bell mouthed end might be there to smooth the airflow into the intake duct, as such a shape will cause less turbulence and, if carefully designed, better flow than a simple "hole" with sharp corners.

I would wonder if it's there to provide a smooth, uniform airflow into the maf if there wasn't a 90 degree bend straight after it which will undo the good work. The fact that it has holes around the edge makes me wonder if it's been designed to cut out some resonances in the intake tract. :-/

We're at the stage where we need to borrow a rolling road to do "before and after" tests to notice any difference, I imagine.

Kevin

[Albatross]

I just called UK Chipped back and asked them about this. They said "remove it; it creates surge, and whilst you're at it cut the 6" fibrous spiral tube that comes into the bottom of the air-box off so that it is flush to the inside of the air-box too, that also creates surge".

So I have been out with a very sharp bread knife and done exactly that with the bottom ducting and just taken it out for a drive...

(No / flush fibrous ducting in the bottom half of air-box and no trumpet. Standard GM (very clean) air-filter)

There's a short stretch of dual carriageway near me and I know exactly how far I have gone down the road before I hit 100mph. That has just been cut by about 50 yards!

[feeutfo]

right, out with the kitchen tools when i get home then. :-)

[SP_3.2]

Just thinking about a rolling road if we could make use of the one at Chipped up as i recall that they do this type of things for car clubs and alike.

I think when i was done there a few years ago they had some of the guys for a BMW club there testing there cars. They also haev very good equipment and know how to interpret the reading  i.e auto drag as most of use of autos.

I could have a look into it if,s of any intrest.

[Martin_1962]

2.6 auto, air box mods as mentioned 0-60 7.8 seconds

I am considering some tuning, definately 3.0 cams. But even thinking of 3.2 lump.

But if I can get > 200bhp with simple mods I'll stick to 2.6

[Martin_1962]

I'm not far from them!

Bromsgrove is about 10-20 minutes from home

[Albatross]

I'd be up for a rolling road. It might be a useful and independent judgment before the mods.

I'll be on a rolling road when I get the final stage remap done so it will be a good comparison.

Thing is that I am already on the road to improvements now that I have the cat-back exhaust and the new air-box modifications.

[Kevin Wood]

I have an AP22 data logger which is quite useful for comparisons if you can find a quiet long straight backroad private test facility.

Kevin

[SP_3.2]

There's a short stretch of dual carriageway near me and I know exactly how far I have gone down the road before I hit 100mph. That has just been cut by about 50 yards!

Think that the Dual carriageway that i took your car out on a drive afew months ago checking out the mv6 springs and dampens. .

Have you noiced any change in noise  :question