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Author this is how to de-restrict an airbox!!!
Dave A
USER UNDER INVESTIGATION - DO NOT TRADE

Registered: 10th Dec 03
Location: County Durham
User status: Offline
9th Apr 05 at 19:49   View User's Profile U2U Member Reply With Quote

noticed lately that a lot of people are asking how to drill an airbox.

drilling the airbox alone wont give any power gains, although many people say that it feels more "responsive". ive tested a corsa gsi with a standard airbox and a drilled airbox on a rolling road and there was no difference at all!

There is one modification that you can do to your airbox to give small gains, and that is to de-restrict it. this is how its done:

take off the lid of the airbox


if you look in the lid you will see this


the tube coming from the top is a restrictive part of the airbox, it has a very narrow neck. to remove it, tap it gently with a hammer and it will slide off.



the next part to remove is inside the actual box itself. its the piece of tube that is bent 90' in the pic.


the purpose of this tube is to throw any water, dirt and grit into the side of the airbox away from the filter, but if you are willing to replace the filter regularly (or if u have a re-usable filter such as a K&N panel then clean it regularly) then this isnt a problem.

remove it by pushing the "lug" from the front of the box and sliding the tube upwards towards the top of the box. it can take a bit of force, but take your time.




some tubes are held to the bottom of the box with a rivet, try prying the tube from it, it doesnt matter if it snaps, you will be throwing it away!

re-assemble the box, and refit to the car. job done. dont expect huge gains from this, i only saw a gain of 3 bhp with this mod done, and that was on a highly tuned gsi. although it should give a slightly more responsive feel, and compliment other mods.


if you do wish to drill you box as well, (wont give any gain at all, but sounds nice:lol heres how to do it:

take a 20mm drill bit


drill holes in the bottom of the box away from the engine


and on the side away from the engine


a cold air feed to the bottom of the box will also be an advantage.

if youve got an earlier model car then you can just prise off the bottom of the box, and you wont have to drill it. again a cold air feed will be an advantage.


with any of the above, a free flowing panel filter will help as well, heres a K&N one insid my box from the gsi


hope this helps
Rob B
Member

Registered: 8th Jan 04
Location: Area Motorsport Drives: Race EP3
User status: Offline
9th Apr 05 at 20:05   View User's Profile U2U Member Reply With Quote

good tutorial mate
James R
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Registered: 4th Feb 03
Location: 205GTi16/306GTi16
User status: Offline
9th Apr 05 at 20:07   View User's Profile U2U Member Reply With Quote

Good guide.

Although a trumpeted inlet will flow air much better than a sharp edge.
so it might be worth leaving the top part in there, but I doubt theres much difference between in and out.
Dave A
USER UNDER INVESTIGATION - DO NOT TRADE

Registered: 10th Dec 03
Location: County Durham
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9th Apr 05 at 20:10   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by j1400
Good guide.

Although a trumpeted inlet will flow air much better than a sharp edge.
so it might be worth leaving the top part in there, but I doubt theres much difference between in and out.



did think about that, although the tube is very narrow at that point. the edge of the intake on the lid isnt that sharp anyway, still quite smooth.
R Lee
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Registered: 15th Aug 03
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9th Apr 05 at 20:35   View User's Profile U2U Member Reply With Quote

people say its more responsive because it sounds better with the holes.

all psychological.
Dave A
USER UNDER INVESTIGATION - DO NOT TRADE

Registered: 10th Dec 03
Location: County Durham
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9th Apr 05 at 21:21   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Richard Lee
people say its more responsive because it sounds better with the holes.

all psychological.


i agee, when it sounds better, people think its faster
Graham
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Registered: 12th Oct 03
Location: Lincoln.
User status: Offline
9th Apr 05 at 23:17   View User's Profile U2U Member Reply With Quote

finally a new one, this tutorial is way old but the last one had all its pics removed
well done though
Richie B
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Registered: 18th Apr 04
Location: Newcastle
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9th Apr 05 at 23:21   View User's Profile U2U Member Reply With Quote

really good tutorial that
waynep
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Registered: 20th Apr 02
Location: london
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30th Apr 05 at 08:22   View User's Profile U2U Member Reply With Quote

ttt for people as i like this thread
glennpanton
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Registered: 30th Jul 01
Location: west sussex
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30th Apr 05 at 08:30   View User's Profile U2U Member Reply With Quote

well done mate,done mine sounds almost as good as induction filter
RKS
Member

Registered: 2nd Mar 04
Location: Gloucestershire UK
User status: Offline
30th Apr 05 at 11:34   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by corsa808
quote:
Originally posted by Richard Lee
people say its more responsive because it sounds better with the holes.

all psychological.


i agee, when it sounds better, people think its faster


ill agree with that.... im always getting a bollocking @ work cuz apparently I ramp thru the car park as there is noise comin from my zorst

 
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