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Old 09-08-2003, 09:13 PM   #1
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I was just wandering if there is anything I could do with my 1994 Model airbox to get more airflow into the engine? I already have a K&N Filter installed. Or should I just invest in a intake kit? I am just trying to thing of inexpensive ways to improve HP.
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Old 09-08-2003, 09:18 PM   #2
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You can gut the internals of the box, and ventilate it some.....but eventually, you'll have a custom intake with a cone filter (best option of all), so just jump on down to the Vendors forum, and read the thread titled 'return of ADTR'.
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Old 09-09-2003, 12:04 AM   #3
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I gutted both parts of my airbox. This gave me a nice little low whine at idle, and at acceleration. Might have added like 1-3 hp. The other thing you can do is get some piping under your front bumper and route it to the stock airbox. This might create a slight ram air effect.
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Old 09-09-2003, 12:05 AM   #4
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Don't mean to grab the topic, but willwren quick question?

Where can I drill the holes in the airbox, or is there no real point if I gutted it, and have the ram air setup?
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Old 09-09-2003, 12:08 AM   #5
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Grab away. We're on topic

Click on the SSEi logo in my sig, it'll take you to my webpage. Click on Bonnevilles, and look at the OLD pictures of my engine bay (current pics in the ADTR thread in the vendors forum).

The Series 2 airbox is different, but that'll give you an idea anyway. Three 3" diameter hoses piped out to 'colder' climates.
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Old 09-09-2003, 12:50 AM   #6
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Hmm, that looks pretty nice, but I would rather avoid cutting any holes into my airbox, I know that I can have a large scoop at the bottom of my car, that will then go to a smaller pipe that will run straight into my airbox (airbox has a 2" opening at the part behind the headlight). This should provide somewhat of a ram air effect. I will of course seal the portion between the pipe and the airbox.
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Old 09-09-2003, 01:08 AM   #7
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Bud.....do yourself a favor. 2" isn't **** for air volume. Gut that thing! Or go to a junkyard to get another to gut. Otherwise, go to a mandrel bent intake pipe with a cone. That K&N and your engine are both capable of pulling more air than the stock box can deliver. This is true for both the NA and SC models....ESPECIALLY the Series II.

Have you read the Techinfo article on airbox mods/maf screen removal?
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Old 09-09-2003, 01:51 AM   #8
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I have got to post the pics of my airbox. I pulled all the internals, and cut the entire front end off (where it'* about the size of a 2x4). I get a nice sound, and I at least think I get more power.
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Old 09-09-2003, 12:44 PM   #9
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willwren, my airbox is already gutted. I took out the plastic pipe pieces that are stock on the inside of the airbox. I was thinking of cutting away the last piece of the airbox that goes to the end behind my headlight, only problem is, it will not be a regular hole, but more of a cross between a circle and a rectangle. Is there something else you mean by gutting my airbox?
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Old 09-09-2003, 05:48 PM   #10
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I never had to gut my airbox. The Series I airbox was fairly unrestricted. From what I've heard, the Series II is horrible. There are some pics posted around here somewhere. I think Dr Seuss posted some.

The surface area of the stock filter or replacement K&N is really the weak point, not to mention the turbulent flow. You need more air, and it needs to be as laminar as possible.

The K&N replacement with a modified airbox is an improvement, but it'* only marginally better than stock.

If the stock setup had an airflow rating of 5 on a scale of 1-10, the modified airbox with a K&N would be a 7, the custom intake with a cone filter would be a 9, and adding a CAI would make you a 10. Just a rough example to give you an idea of the performance/efficiency gains that are possible. By the time you get your intake done, you'll really be ready to work on the exhaust. They go hand-in-hand. Breathe in, breathe out.
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