I'm pretty sure that you drill the holes on the side farthest to the left, as to avoid sucking hot air in. As much as possible,anyway. You can drill many, many small holes. Several medium holes, or a couple large holes. In groups such as Volkswagen, Honda and some Porsche, this is referred to as "Swiss cheese"ing your air box.i recall this being discussed years ago in modifying the air canister on the fuel injected X1/9s by drilling holes in it. I can’t find the link to this.
Can someone post pictures of this modification and detail on how they did this like drill bit size.
Thanks
didn't do much on my Mk2 GTi, with the same Bosch Jetronic. Can't imagine the X1/9 fairing any better. The sound does increase the sensation of performance gains. I think uprrated injectors, fuel pump and either a chip or other MAF modifications, would net more tangible results. Just my unsolicited $.02Does it make a difference?
I have a dual outlet Euro manifold with dual down pipe from a Yugo, into a catless system. I increased the exhaust diameter to 2.25in. The results were profound! The noise is noticeably improved as well. My X is a de-smogged carb'd car, so I'm not sure how the FI cars will react. Although, again on one of my old Mk2 GTi, I ran a Swiss cheesed Air box w/a free flowing 2.25 in exhaust, and there were definite improvements. The problem is that the Bosch ecu & afm are the limiting factors. Hence why I previously suggested installing a chip and uprrated injectors & pumpLooking at the restriction offered by the stock AFM, it is doubtful there would be much to gain by modifying the air box. Having said that, I would be interested in hearing a response from someone who has made the modification. I am curious if the exhaust side, namely the catalytic converter, is where there is a restriction. Is there any benefit to a higher flow cat?
Brian
I cut one big hole in mine.i recall this being discussed years ago in modifying the air canister on the fuel injected X1/9s by drilling holes in it. I can’t find the link to this.
Can someone post pictures of this modification and detail on how they did this like drill bit size.
Thanks