PistonSlap

many times? where are the other results? and isn't gadget supercharged? You can not compare the gains on a very tricked out motor to a stocker.

I do remember seeing a test from someone in Tn I think a few years ago on the old Tacoma board and results were so slight that there were points through the range that the closed box produced more. It did at peak show slightly more hp, but we are talking less than 5hp. You simply can not feel that. That is totally impossible. You can get that kind of gain in going from an old air filter to a new one.

As I have said before I did this trick and my truck ran like garbage. It was loud and I got horrible gas mileage. That was not in my head.

If you like the extra noise and you can trick yourself in to thinking you are feeling something you can't, enjoy. I am offering another view so that the others who experience similar results don't think they are crazy or there is something wrong with their truck when they try this.

MTL_4runner

Responses in red.

Beartracker

This is one of those things where you do what you believe works best for your engine. I'm not about to tell any of you that you are wrong but I will say this. Not all engines will always produce the same results and we all know that to be fact.
Some run better then others and if you tested several I would be willing to bet that you would see a spread from no gain in power to a possiable 5-20 hp.
Way to many things to consider when testing like the Elevation, weather, what brand gas , new or used sensors. last tuneup, filters used for test and so on. Just my openion on this subject ;0) Mike

midiwall

Jamie's got most of this handled, but to answer one specific question:

He wasn't when he ran the airbox dyno tests.

And, if the link isn't clear, he picked up 9hp from opening up the box (or pulling the elbow):


My dyno run showed +5hp (and I also did it pre s/c)... I can dig it up if you'd like.

Gangus2006

Wait...so a 6" DP will fit a 2000 4Runner 3.4L airbox right?

MTL_4runner

I think a 5" fit the best but they are tougher to find.
The 6" will go off the edge a bit but will seal up fine.

midiwall

Ditto, but Gangus, note the dyno chart and how Gadget found the same gains between opening the air box and just pulling the elbow.

The point being that there's a point of diminishing returns... A 6" deckplate is of course larger than a 4", but it won't get you any more air. A N/A engine will only use what it sucks based on the vacuum generated by the pistons on the intake stroke and limited by the size of the valves. Once you get to that point, anything more is moo.

There was a thread here a long while back (a year or more?) where someone did the math at just how much air the 3.4L can actually suck in. I think it was part of a thread where someone was trying to make a case for using one of the "electric leaf blower turbos" that you see on eBay.

Now of course this all goes to pot when you start talking about a S/C'd engine that's forcing air down through the intake and into the cylinders.

Gangus2006

Im only mentioning a 6" DP becuase thats the only thing I can find.

midiwall

Ahhh... carry on then!

Beartracker

This company sells about any size you need but here is there 4.5" for $7.00 plus shipping. Hope this helps, Mike
http://www.overtons.com/modperl/over...item_num=30771

Beartracker

I'm still trying to figure out how you gain anything by cutting the elbow off? You already have air flow so why cut it? Unless you make the hole bigger where the elbow was then the air flow would remain the same. Maybe I'm missing somthing here? Mike

Beartracker

After reading Gadgets artical again I see where he said the elbow restricks air flow due to the sharp bend. That makes sence to me now. He also stated that he got real close to the same results as cutting a hole in the box by just removing the elbow and recomends that rout instead of cutting a hole in the box.

From his site: "Now if you just cut open the front of the box you get 6.4 HP over the stock box for free or 9.6 over the K&N FIPK. Remember from the previous chart you will get basically the same results by removing the elbow as cutting open the box. I think this might be the way to go so you can pop it back in if you decide to go swimming."

Beartracker

I went with removing the elbow from the box and by cutting off the rivet holding it and trimming the little plastic tabs down so I could pull out the elbow. I screened in the hole in the box from the inside useing a piece of screen and silicone.
I left the wheel well flange for the elbow in tact and then I cut a trimmed the elbow so that I can pop it back in for off road or dusty days. Really works great!
I'll be taking a 700 miles trip next week and we'll see if I can feel any extra power or improved gas milage. We are allowed to do 70 mph on our expressway's here in WV. It does seem a little better on the hill leading to my driveway.