Custom Airbox???

1BadTitan · 04-15-2004, 10:05 AM

Has anyone ever taken their stock airbox and used a holesaw to cut maybe 3 or 4 two inch holes in the back of it to gain airflow. I'm wondering about doing that and having my K&N filter, if it would show any type of gain. I know some honda guys do it, and it's done all the time on atv's. I'm not comparing our titans to hondas or atv's, but shouldn't the results be the same? And no, it's not any type of "rigging". I've seen it done alot, just wonder what it might do for the titan.

Sammy Sandbag · 04-15-2004, 12:32 PM

Quote:

Originally Posted by 1BadTitan

Has anyone ever taken their stock airbox and used a holesaw to cut maybe 3 or 4 two inch holes in the back of it to gain airflow. I'm wondering about doing that and having my K&N filter, if it would show any type of gain. I know some honda guys do it, and it's done all the time on atv's. I'm not comparing our titans to hondas or atv's, but shouldn't the results be the same? And no, it's not any type of "rigging". I've seen it done alot, just wonder what it might do for the titan.

I did it on my Blazer by cutting about 5 holes in the bottom of the airbox using a drill press. The butt dyno couldn't tell a difference, but it might have added a tad more power. Of course, the blazer had a lousy mass air flow sensor and a bad intake through the gap between the head lights and turn signals. You might achieve better results with the Titan. The good thing about doing this mod is if you lose power, you can simply take some aluminum duct tape and seal off the holes.

juma · 04-16-2004, 03:59 AM

if you cut the holes on the grill side of the airbox and remove that flap of material to outboard of the windshield washer tank to let in more cold air from the grill, you might get a little more punch out of it....juma

1BadTitan · 04-16-2004, 04:15 AM

I did it last night at work. I installed the K&N and used a 2" holesaw to drill 4 holes in the bottom of the airbox. I also let the ecu reset. No one will believe this but it really works. Only downside is, its loud when you get into it. It almost sounds like there is exhaust already on it. It pulls harder through 1st and 2nd. The rest doesn't feel any different.

Sammy Sandbag · 04-20-2004, 08:24 PM

I finally got around to the ol' Sandbag mod too. I figured why not, if it doesn't work, I can still seal it up or even upgrade to a "real" CAI. Well I drilled several 1 7/8"s holes on the front side of the box. The butt dyno sez it moves out quicker, slightly but noticible. I'm still debating on whether or not to just cut the entire airbox from the round tube and install a K&N conical filter on it. It would be about a $50 mod versus $300. I just need to figure out what size inlet to get. The OD of the tube apears to be ~3", but that's just measuring with a tape measure from the box side. Does anyone have an outside caliper they can check the size with?

Optimist · 04-20-2004, 08:56 PM

If you wish to check out how others have gone about this here is a good site for the 4Runner. Further testing has provided some interesting findings regarding K&N & a few other after market induction products, still the information is specific to the 4Runner.

http://www.gadgetonline.com/airinduction.htm

juma · 04-21-2004, 02:02 AM

Quote:

Originally Posted by sammy sandbag

I finally got around to the ol' Sandbag mod too. I figured why not, if it doesn't work, I can still seal it up or even upgrade to a "real" CAI. Well I drilled several 1 7/8"s holes on the front side of the box. The butt dyno sez it moves out quicker, slightly but noticible. I'm still debating on whether or not to just cut the entire airbox from the round tube and install a K&N conical filter on it. It would be about a $50 mod versus $300. I just need to figure out what size inlet to get. The OD of the tube apears to be ~3", but that's just measuring with a tape measure from the box side. Does anyone have an outside caliper they can check the size with?

measure the circumference and divide by 3.14 to get the diameter. a K&N will compress a bit if its a little bigger. juma

Sammy Sandbag · 04-21-2004, 04:53 AM

I thought about doing that, but I'd really like to get as accurate a measurement as possible. K&N has a wide selection of inlet sizes, so I'd want to get it as close as possible. I also have to devise a way of supporting the filter to keep it from flopping around. I could fab up a heat shield, but I'm not all too convinced that they provide anything other than a support for the filter.

bestatchess · 04-21-2004, 11:16 AM

Quote:

Originally Posted by 1BadTitan

Has anyone ever taken their stock airbox and used a holesaw to cut maybe 3 or 4 two inch holes in the back of it to gain airflow. I'm wondering about doing that and having my K&N filter, if it would show any type of gain. I know some honda guys do it, and it's done all the time on atv's. I'm not comparing our titans to hondas or atv's, but shouldn't the results be the same? And no, it's not any type of "rigging". I've seen it done alot, just wonder what it might do for the titan.

Yes, I thought that the whole air box - filter arrangement was way too restrictive. So I took a piece of 12" PVC sewer pipe, connected it to the air pipe with a big funnel, then sawed a big hole in the hood and ran the sewer pipe out through the hood. Works great, nice sound. Sucks in a few birds now and then, but the 1" mesh screen I put in there catches them.

Then I got to thinking about the way too restrictive stock exhaust. I took a torch and cut off the pipe just under the driver's seat, and connected it to some flexible 8" galvanized and then cut a big hole in the floor and ran it up into the cab. If the fumes get too thick, I have to open the sunroof, but the sound is awesome!!!!

HDVa · 04-21-2004, 11:24 AM

Quote:

Originally Posted by bestatchess

Yes, I thought that the whole air box - filter arrangement was way too restrictive. So I took a piece of 12" PVC sewer pipe, connected it to the air pipe with a big funnel, then sawed a big hole in the hood and ran the sewer pipe out through the hood. Works great, nice sound. Sucks in a few birds now and then, but the 1" mesh screen I put in there catches them.

Then I got to thinking about the way too restrictive stock exhaust. I took a torch and cut off the pipe just under the driver's seat, and connected it to some flexible 8" galvanized and then cut a big hole in the floor and ran it up into the cab. If the fumes get too thick, I have to open the sunroof, but the sound is awesome!!!!

OMG, you are way too funny. I think I just swallowed my tonsils!!!

TurboDieselTitan · 04-03-2006, 01:30 AM

Quote:

Originally Posted by bestatchess

Yes, I thought that the whole air box - filter arrangement was way too restrictive. So I took a piece of 12" PVC sewer pipe, connected it to the air pipe with a big funnel, then sawed a big hole in the hood and ran the sewer pipe out through the hood. Works great, nice sound. Sucks in a few birds now and then, but the 1" mesh screen I put in there catches them.

Then I got to thinking about the way too restrictive stock exhaust. I took a torch and cut off the pipe just under the driver's seat, and connected it to some flexible 8" galvanized and then cut a big hole in the floor and ran it up into the cab. If the fumes get too thick, I have to open the sunroof, but the sound is awesome!!!!

ahhahahahahhahahaha