can someone help me.... I’m getting conflicting advice from everywhere.

I have a filter relocation kit that takes my jetex filter into the bumper..i'm putting the airbox back in with a panel filter.

is there any point in drilling a few extra ventilation holes in the box with a large cold air feed or not???

i would say not as the resistance from the panel will be more than the standard air feed pipe anyway. although im not sure i entirely understand :think:

thats what i thorght, but it seams to be the thing golf owners are doing up in here the north east.

if these things improve the car, im sure manufacturer would have engineered it. drilled holes also make less pressure - while driving the air is forced up the hose, with holes that ramming effect is lost

More of a tip...

Go clean your snow filter in the air pipe to the stock air box. You'd truly be amazed at the rubbish that gets in there!

Or replace the original air pipe with another that runs down towards the bumper.

that’s the reason im putting the box back in, I clean it every service and it gets hacky as fook down there. its a mission to get off, I’ve got to undo the arch liner.

drilling the air box...a very bad idea.

the filter/box in the vrs is the same as in the tt 225 etc so all ive done is put a 4.5'' cold air feed pipe from the bumper grill to the airbox and inlarged the hole entering the box.it most help a little

the filter/box in the vrs is the same as in the tt 225 etc so all ive done is put a 4.5'' cold air feed pipe from the bumper grill to the airbox and inlarged the hole entering the box.it most help a little

this would be more sensible

cheers mr g... think thats what ill be doing then, as it seam a sensible mod. coz i dont fancy filling the bottom of the box full of holes.

I have a 3in pipe running from behind bumper grill up side of battery to a jabbasport induction kit,

basically makes a enclosed box in engine bay when bonnets closed

can someone help me.... I’m getting conflicting advice from everywhere.

I have a filter relocation kit that takes my jetex filter into the bumper..i'm putting the airbox back in with a panel filter.

is there any point in drilling a few extra ventilation holes in the box with a large cold air feed or not???

It depends on why you want to drill the airbox.

can someone help me.... I’m getting conflicting advice from everywhere.

I have a filter relocation kit that takes my jetex filter into the bumper..i'm putting the airbox back in with a panel filter.

is there any point in drilling a few extra ventilation holes in the box with a large cold air feed or not???

Sorry for double post using iPhone and fingers to large to type.

A lot of mk4 forums drill airbox for more induction noise and to hear the DV louder.

If you want performance then suggest don't drill airbox as this could let heat from engine into airbox which you don't want. I experimented doing various things to airbox as had 3 spare.

Best bet as stated and from others is hook up a feed of ducting to airbox to get as much cool air in as possible. The std pipe from inner wing is poor.

That said i never got any muck in air box with small holes drilled based on where it sits. Even my cone filter that sits behind bumper keeps reasonably clean.

Also if you have a relocation kit for your filer no reason why that should not work ok .

They did a dyno run on drilled vs stock vs cone filter on the golf forum. The one that came out on top and had the most gains was a standard pannel filter with the internals of the airbox smoothed and modded and a cold air feed. Il try n find a link

Here you go, different car I know but same princable

http://www.golfgtiforum.co.uk/index.php?topic=129025.0

More of a tip...

Go clean your snow filter in the air pipe to the stock air box. You'd truly be amazed at the rubbish that gets in there!

Or replace the original air pipe with another that runs down towards the bumper.

I might sound dumb here, but what do you mean by Snow filter?

i remember back in the day wen i had my first car (205 gti rep 1.2 8v) i drilled the box to make it sound like it had more grunt but it was even slower after that.

I am replacing my piper X cone with a std box (thanks to Gee-man) and then im going to follow "bowders1"'s thred (no hole drilling tho) to make an OEM+ air box.

http://www.briskoda....-and-3-pipping/

Marko

I might sound dumb here, but what do you mean by Snow filter?

The stock pipe running to the air box has a filter inside it. It generally gets full of crud/bugs/etc. Either removing it or cleaning it is recommended - but if you're going to the effort of removing it, you may as well replace with a different pipe full stop.

if these things improve the car, im sure manufacturer would have engineered it. drilled holes also make less pressure - while driving the air is forced up the hose, with holes that ramming effect is lost

Drilled holes do not change pressure (think of cone filters) although will induce more noise and potential heat soak from the engine bay.

Sealed air boxes are made for subtlety and practicality to suit the mass market - drilled holes may gain more air flow but any benefits would probably be outweighed by extra heat intake fro the engine bay.

Only do it if you want extra noise with no real extra go because the map won't be set up for the extra air intake anyhow - so its a pretty wasteful excercise, might as well keep it standard so that if you ever get a proper cold air intake, you can put the standard one back on if selling for example. A standard one with holes in would not be desirable to potential buyers

Edited 24 June, 201214 yr by Gtiracer

Nothing wrong with the totally standard intake. You'll find a lot of people just change things due to boredom and marketing.

You'll see better performance gains from making sure the engine is perfectly maintained.

+1 (full servis history is key)

Take a look at this,

http://www.briskoda....1414-induction/

Marko

the quickest and simple explanation :

The whole intake sistem was designed for a perfect linear air flow.That for a quick fill of the cilinders in the short time when the intake valve is open,in that time air admission must be very quck and efficient.

If you drill the intake air box hoping for more air ,you're wrong....because you'll get turbulent flow from new wholes.Turbulent air is chaos,low pressure and low speed...so the air intake in the cilinders will be less.

but doe's the same apply when a turbo is fitted where the air is sucked and blown in by the turbo spining rather then the pistons drawing it in by themselves on a N/A engine? :/

Edited 26 June, 201214 yr by MR G

No,the turbo chargers are designed for best laminar flow also.That's why they lool like a shell snail and is not like a pipe and a fan in it.