What's the best OSCAI setup?
 

I'm interested in going OSCAI. I don't care about the sound and I don't want to lose low end power this summer in exchange for growl. For those who have settled on OSCAI and have gotten great results, what type of tube are you using and what size is it? How is the tube secured in the engine compartment? Do I have to punch through the splash guard to get good results?

I did a quick write up on my set up....

http://forums.maxima.org/showthread.php?threadid=102082

If you're creative enough, you can get around any cutting. As for the type of tube you use, just make sure:
1) It doesn't crease when bent or else it could clog the airflow.
2) Not preforated on the inside to allow smooth air flow
3) Doesn't conduct heat, or it will heat up the air in the tube!

Re: What's the best OSCAI setup?
 

I'm using 3" shop vac hose and I've got the end resting inside the splash guard. While I realize this implementation is anathema to the OSCAI purist, it works just fine for me.

Here's mine - no splash guard cutting invloved and it works great along with a K&N!

OSCAI

Yeah. That works. What did you use to construct the OSCAI tube?

Same as Y2Kse, although I’m not sure it’s the best setup. When it’s dry I let the shop-vac hose hang straight down below the splash guard. When it’s wet, I tuck it up in there.

Not really sure it makes a difference either way. I felt a little bit more pull at higher RPM, but honestly it was barely noticeable.

Thinking of going cone, but then summer will be here soon. And Franken for some reason never (yet?) backed up their promises of dynoing a 2K-2K1 to prove to me it would be worth the $150.

Here's mine plus Empz's from about a year ago:

http://forums.maxima.org/showthread....threadid=38111

Orange crate screen is still holding up, btw :D

The way I did mine is a little involved and you can't really see all the detail on where/how exactly I cut the stock intake. The piping is basic 3" tin pipe found at Home Depot. They sell it in 5' sections for about 7 bucks! You'll find it close to the plumbing section. They also sell a curved section that can be rotated to just about any angle you want. You'll need tin snips as well if you don't already have them.
I incorporated the curved piece to better direct the air flow. Attaching this piece securely to the stock intake is the tricky part - I used two nuts/bolts, one on each side. I also used some insulating tape around where the curved piece joins the intake for a better seal. Join the pieces with a 3" to 3" rubber coupler. I made sure I had about 4" clearance between the pipe and the splash guard (in other words the pipe is about 4" inches above the splashguard). The main benefit of incorporating the curved piece is it leads to less turbulance within the stock intake and a smoother idle, compared to just using the straight piece. You may just want to use the straight piece since it'll be a lot easier to do.
I experimented a lot with different shop vac hoses, shop vac extensions, 3" dryer duct tubing, ect ect ect (I even went so far as using a home-made dynamometer, along with my vacuum cleaner to test air flow turbulance and pressure drops with the various set-ups!). This is the best OSCAI set-up I've come up with so far - performance and idle-wise.

One last thing I did was taper the inside edge of the opening on the stock airbox (where the stock scoop and airbox meet)- again all in the name of smoother airlow. You'd be surprised how stuff like this makes a difference on the intake side!