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Welcome to the guide on how to drill you airbox.

This guide was carried out on a 1.6sport but has also been done on an escort 1.8gti and a 1.4 corsa sport. The basic principles of the guide can be used to drill the airbox on any other car.

Tools
Drill
Drill bits.

Guide moved to https://tinyurl.com/y7z9sa4b
 

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i had an induction kit but it mad the car feel like it wos holding back.so il giv it a go see if its any better.:)
 

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Discussion Starter #6
The holding back may have been a flatspot caused by heat entering your engine.
At worst all this will do is make your car have a louder grunt to it so there's nothing to worry about.

Dearing5, my personal opinion is that it is better than a k&n.
A lot of owners of rs turbos prefer to drill the airbox instead of fitting induction kits. They swear by the method.
 

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But doesn't this just draw more Hot air in from the engine bay and give Less power??

Wouldn't it just be better to remove the pipe inside?

Max Power did a test ages ago, and out of a Cone filter, Drilled air box and De-restricted air box the most power was gained from the De-restricted one.
 

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That's why you drill the holes on the side furthest away from the engine, unless you have the cold air feed they will further away from the engine than the original inlet hole is. Although I imagine derestricting it as well as drilling it would surely gain the benefits of both? Out of interest what gains did Max Power get by derestricting it?
 

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Discussion Starter #11
De-restricting it is literally a case of tapping out a piece of plastic pipe that is attached to the top of the airbox lid. I have also done that to mine. The air sucked up through the drilled holes is mainly directed up from the area just behind the lower front bumper so the majority if not all will be cool.
It cuts out miles more hot air than an induction kit due to the enclosed box keeping the hot and cold air seperated.
There should also be a cold air feed from the front of the engine bay to the airbox but mine is missing. Make sure you keep this and re-attach it once the airbox is put back into place.
 

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Discussion Starter #12
I will also get a tutorial up about de-restricting the airbox asap.
 

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De-restricting it is literally a case of tapping out a piece of plastic pipe that is attached to the top of the airbox lid.
Isn't there also a bit of pipe attatched to the bottom of the airbox? A curly piece of pipe lol.
 

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Discussion Starter #15

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jus drilled my air box soundes better that the pipercross an k&n induction kits iv tryed an dosnt lose power live they do.cheers for all the help lee.drilling the box is the way forward lol.:)
 

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Discussion Starter #17
Glad to know I could be of help.
 

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Can I just point out that it's not possible to derestrict all airboxes on corsas? I know my old corsa (1.2 8v) didn't have any of that piping inside the airbox so I'm assuming it's not restricted in the first place? But the pipes are there on my current car. Just thought I'd point that out in case someone goes to do it and finds nothing to take out and gets confused lol. Out of interest does anyone know which airboxes are restricted and which ones arent?
 
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