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Thread: Drilled Airbox

  1. #1
    fran-s3's Avatar
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    Drilled Airbox

    Well I took the plunge yesterday as I really wanted my S3 to sound more meatier and drilled some small holes in my airbox. (http://www.wak-tt.com/mods/ramair/cheapinduction.htm) Also cleanned out my green panel!

    I did these on the front and the bottom. I was expecting a bit of a loss of performance to be honest but was prepared to sacrifice that. Anyway drove to bedford last night on some dualys and my goodness what a difference. It didnt make it much more louder a little, can hear the DV a bit more. But my days does it pull better top end, was really surprissed by the difference! Throttle response was better to.

    Although I took the oppurntunity to smooth out my airbox to while I was at it i.e taking out all the ridges at the bottom with a plastic cutter so not sure if this the reason. Anyhow im chuffed to bits - im sure im gonna slated for doing it and by told it's all in my head but I honestly can feel a noticeable improvement.
    Last edited by fran-s3; 22nd March 2009 at 11:44.

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    Mr.G's Avatar
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    Thanks for letting us know mate. Might be worthwhile for some if they wanna do it cheaply.

    G

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    Dani_B19's Avatar
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    So what does smoothing out the airbox consist of? Im sure its pretty smooth anyway!
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    Dani, its a case of taking away the fins which aid water ducting i beleive...were water to get in there some how then it wouldnt be channelled as efficiently, thats my understanding
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    Quote Originally Posted by 1animal1 View Post
    Dani, its a case of taking away the fins which aid water ducting i beleive...were water to get in there some how then it wouldnt be channelled as efficiently, thats my understanding
    Yes spot on there on the bottom half of the airbox.

  7. #6
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    hmmmmm interesting.

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    so what happens if you drive through a big puddle or it floods (that will never happen in this country) and you get water in there without the fins ?
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    humm interesting this.

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    You'd be up Shhhh......creek with out a paddle or S3!

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    If the flood or puddle is high enough to reach the airbox or indeed the intake which is located at top of the passenger wheel arch, I'd say you have bigger problems to worry about out!!

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    hmmmmm interesting.

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    i guess so, the only reason it came to mind was that i drove through a river by mistake and the water came up over the bonnet for a short while and i ended up with a water level in both my fogs and main lights but despite this the engine didnt flood...

    i cant begin to impress upon you how scared i was a the time - the bow wave was kept as far away as possible !

    Oh i also ended up with some reeds and some aquatic animals in the engine compartment. The interior didnt flood at all - was only several seconds of driving in the river but still.

    I was very impressed by the car not dying on me - lucky.
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    Quote Originally Posted by fran-s3 View Post
    But my days does it pull better top end, was really surprissed by the difference! Throttle response was better to.

    Although I took the oppurntunity to smooth out my airbox to while I was at it
    The improvement you've seen is almost certainly due to smoothing the airbox, and not the silly holes you've drilled in it.

    Adding holes will only allow it to pull in warmer air from inside the engine bay, and is a complete waste of time.

    What you're best off doing, is removing the standard cold air feed into the airbox, and replacing it with some larger 80-100mm ducting routed down into the front bumper for a proper cold air feed.

    Quote Originally Posted by cjhill View Post
    i drove through a river by mistake
    That comment just made my day :D
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    s3 tys

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    can u buy a carboni cold intake for an s3

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    leshkin's Avatar
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    Quote Originally Posted by cjhill View Post
    .. i drove through a river by mistake...
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    HTC
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    Water ducting.........excuse me....really? Smoothing the box does help. Seen MAF logs to prove this.

    Holes won't make much difference except for noise if you want it. I wouldn't worry about the negligible warmer air. The the air gets squished within an inch of it's life and heats up anyway in the turbo, thus your intercooler. Wouldn't advise on a NA car.

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    1animal1's Avatar
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    if theres definate improvements HTC then im all for it.... the water ducting was something i read ages ago and was the only thing stopping me taking the thing off
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    Is the wider cold feed ducting worth doing, does it make much difference to performance/throttle response/anything?
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    I personally think the OEM feed is more than adequate as it's short so not a lot of sucking to be done by the engine, and it's striaght in the wing arch where the intercooler sits so it is a cooler area...

    Do you really think your gonna get a ram-air effect using a longer air feed? For one if you want a decent position for your feed your gonna have to remove a fog light as believe me there's no decent air supply in the engine bay. If your thinking why not use the OEM location well the hole in the arch isn't big at all and you'll struggle to fit a airfeed pipe in the unless your propered to drill it or use a demell on your bodywork to enlarge it... .. And even if you do manage it the wheel fender is directly under it so your limited for room unless you want to sacrifice youu wheels fender LOL! (not a good idea!)

    Personally I don't think there's any benefit unless your doing about 70mph + and by the time thr air has travelled up the way up all airbox it's gonna have slowed down by the time it gets to the airbox I think... (This is just my opinion please don't slate me for it I'm not saying any one else's is wrong it's up to you what you believe!) Tell you what why not test the theory... If you have a airfeed stick out your car window when you doing a decent speed and point the other end inside and feel how much air being drawn in.. I've done it and it's crap! (ok not exactly scientific test conditions but it's as close as I can recreate!) May be achievable though just be warned!

    But yes as HTC said the air gets warmed up big time in the turbo I understand... I'm still really impressed with my setup but hey ho that's just my experience and opinion. I wanted a meatier sound and I've got one, the engine sounds more alive to me. Don't have any rolling road to prove the throttle response or pick that is better at higher speed though. One thing is for sure I def have not lost performance, but we'll wait and see what happens in the summer months.
    Last edited by fran-s3; 25th March 2009 at 11:14.

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    im sure Glen fitted a 4inch air feed in place of his driver SMIC when he had his..... be interesting to get his take on it as id assume he would have tested the requirment first.....
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    Its a very pikey mod drilling the airbox. Im going to be looking at the induction side of things in the summer. Needs to have a look at these fins everyone talks about.

    The standard feed just look quite restrictive though from a glance.

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    Yeah your right tim but i think it was the passenger side he had his due to his side intercooler been removed, and im pretty sure he didnt have to remove a fog light either
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    1animal1's Avatar
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    na he definately didnt mate.......
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  24. #23
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    Quote Originally Posted by HTC View Post
    Smoothing the box does help. Seen MAF logs to prove this.
    HTC, do you have the logs to hand? I would love to see what improvement I can expect if I do this on mine. Thanks

  25. #24
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    Quote Originally Posted by leshkin View Post
    HTC, do you have the logs to hand? I would love to see what improvement I can expect if I do this on mine. Thanks
    this might help:

    http://uk-mkivs.net/forums/t/8476.aspx?PageIndex=1
    ^^ In my opinion


  26. #25
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    im doing mine this afternoon if i can get the thermostat and crank sensor fitted in time (assuming that cures my issues)
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    1animal1's Avatar
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    interesting this.... read the geocities Bora article on the smoothing....the guide suggests drilling some drain holes which would lead me to beelive that the water ducting 'thing' isnt so much of a bad idea
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  28. #27
    fran-s3's Avatar
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    what at the bottom of the airbox Tim? (which is in effect what I've done!)

  29. #28
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    yes mate, check out the vwvortex link and onto page 2, theres 2 links, ones for the modded air box with 3 small holes drillled for drainage and one link is for modded pipe going into airbox...although it does say drainage holes only needed if modded pipe being added so id guess the existing pipe would have some sort of holes present or a pre filter if such thing exists on cars
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    Ive been reading through this lot and its very interesting:

    http://www.autospeed.com/cms/article.html?&A=0652

    Especially the bit about removing the mesh from the MAF.
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    Quote Originally Posted by Westle View Post
    Ive been reading through this lot and its very interesting:

    http://www.autospeed.com/cms/article.html?&A=0652

    Especially the bit about removing the mesh from the MAF.
    Yep interesting read, not sure I'd ever be willing to remove the mesh from the MAF though...

    The 'just in case' feeling would always be there. Although any restriction that could cause damage would have to pass through the airfilter which would seem highly unlikely! Wonder if it really does make that much of a difference past 4000rpm as reported.

    Anyone brave enough to try it LOL?

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    Looks like I found a weekend project to keep me busy

    Westle, you considering removing the MAF mesh? I'm really starting to hate that negative boost they're talking about

  33. #32
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    Quote Originally Posted by fran-s3 View Post
    Anyone brave enough to try it LOL?
    It's tempting

  34. #33
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    Quote Originally Posted by leshkin View Post
    It's tempting
    Post your finding if you do!!!!!!

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    Quote Originally Posted by Westle View Post

    Especially the bit about removing the mesh from the MAF.
    I did this many many years ago on a 300+ bhp astra turbo and had no problems at all.

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    Yeah I'm up for removing it. Like someone said the chances of something getting throught the air filter in the first place are very slim. The risk is very low for the gain it gives.
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    Cant really say i noticed any gains when i did it,but it all helps.

  38. #37
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    Quote Originally Posted by Westle View Post
    Yeah I'm up for removing it. Like someone said the chances of something getting throught the air filter in the first place are very slim. The risk is very low for the gain it gives.
    Yeah for something to make it through your airbox and punch through your filter is very slim indeed, in fact near impossible I'd say! Cool, let us know how you get on if you do.

    Just be extra carefull removing the mech as we all know how delicate MAF's are! If you sneeze it'll prob break!

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    Westy's Avatar
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    I only scanned through that guide but didn't see anything about taking out the ridges in the box like someone mentioned!
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  40. #39
    1animal1's Avatar
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    i removed the box today and honestly cannot be arsed to remove the fins.... they arent that big in the first place and think any gains will be minimal regardless of the testing that has been done...not for me im afraid
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  41. #40
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    1animal1 - shame I really can feel the difference in something ive done be that the holes or removal of the fins.. Take you no more than half an hour with wire cutters mate go on! DO it while ur watching telly LOL!

    Read this regarding the mesh on the MAF 'its purpose is as a flow straightener for air prior to the MAF, thus, in theory providing a more accurate read' which kinda makes sense for me and prob why I think it potentially could be a bad idea removing it guys.

 

 
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