Air box mods.

[kevin01]

Has anybody done any modifications to the stock airbox? I have a few ideas in the making, to get more air into the box.
I have read one post where some one wanted to add a pipe up to the front.
Just curious if this improves performance & gas milage.
I just have a hard time spending a few hundred bucks on a CAI, & this does not seem cost effective.

[Classick]

There is a mod where, especially on big square airboxes like the frontiers, you can cut a hole in the top or side ( i recommend side) and mount a marine deck plate into it. these deck plates have a circular piece that can screw out and let more air in... HOWEVER... this mod was/is for 2nd and first Gen Tacos and Runners which do NOT have a stock CAI ( like the frontier) so by doing this mod, you might be hurting you performance by creating a port release instead of the vaccume effect.

ill see if i can find the link to the write up, and you can decide for yourself

[kevin01]

That is what I am afraid of. I don't want to create a vacuum or vortex in the airbox & ruin the airflow.
Then I also have thought if I can have enough air inside the box, the filter should straighten the airflow out.
Where are our engineers at?

[Mainerunr]

pretty sure somebody on here cut out half the bottom of his airbox and a bunch of others cut off the silencer tube inside the airbox to reduce the restriction.

[kevin01]

I Have made the modifications to my air box. This is a real easy project, with minimal expense.
I used Schedule 40 PVC pipe , that I threaded the end, about 1 1/4" of threads . I made a screen out of a 2 liter bottle carrying case, that can be found in many dumpsters behind convenient stores. The nuts that I have are from the electrical dept. of home depot. I used a roto-zip to remove the thread stop on the inside nut. The airbox was drilled out with a 2 3/8" hole saw. Project time= 1 hour.

I took a short test drive after the installation, & the engine has a nice growl at WOT, that was not there before. Yes, I have modified my silencer tube

I am going to run the stock air filter for two tanks of gas, to see if fuel economy has improved or remained the same. I will then switch to a K&N air filter.

I will post my results.

[REDNISMOCRU]

I removed my silencer a few months ago. It has a sweet growl with the K&N along with a little more pep and slightly better fuel economy. See attached:

[Donahue57]

I hacked out the inner part of the tube plus most of the front panel of the air box. No change in MPG, however I ended up with a decent amount of sound. If you want pics I will post them.

[Nismo54]

Seems like a pretty simple mod to let more air in. Wondering if it would help even more to use a larger tube or add a 2nd tube to the right?

[kevin01]

Originally Posted by Nismo54

Seems like a pretty simple mod to let more air in. Wondering if it would help even more to use a larger tube or add a 2nd tube to the right?

There is room to add another tube on the right side of the box.

[BABYBUSA01]

i was one of the guys that suggested a ram air system. unfortunately, i decided to squash the project, but not entirely. now, i am thinking about running a box/pipe behind the upper grille to the side wall where the oem intake is feeding itself currently and blowing a 3" hole to provide some real fresh air.