stock air box mod!!!
 

I jus cut open the bottom half of my air box, and WOW!!! wat a difference! def something that should b done, picking up my k&n drop in later today. will post some pics

any pics??

I'm actually off my phone so I can't right now, but give me about an hour and ill hook some pics up.

pics????????????

Times up. Wheres the Pic?

pics are here! haha my handy work is not the best, but plan on making it look better.

http://i207.photobucket.com/albums/b...935-3-7003.jpg
http://i207.photobucket.com/albums/b...935-3-7002.jpg

stock air box mod
 

so this is now a modified short box intake?

what did you use a butcher knife? lol

Interesting... I suppose its a cheap way to make your Fit sound louder.. but as for performance gains.. I don't see this really working. The hole that is cut is directly over the transmission and that rad hose.. would that not just allow hot air to rise up into the intake?

I know other short rams kind of do the same thing, but the filter is more of an open element system...

I'd be curious to see that on a dyno!

haha I used a dremel tool, but the box has a wicked maze so it was hard to cut and make look pretty, and I feel the hp diff, not so restricted. I want to put it on a dyno soon to see any difference? Its jus something for now, until j's racing comes out with their usdm fitted intake

a lot of people do this to other hondas also, it's just as good as a short ram and it looks completely stock so cops cant hassle them.

I'm just the new guy here and this is my first post, but that can't be good. The air exiting your radiator is pretty hot and that's where it goes. You've just turned a relatively good CAI into a hot air intake.

this is how about 90% of short rams are placed at, and good cai? you should take a good look at how good this box was made, the main purpose was to cut noise which they did, which unfortunatley makes it very restrictive

Short ram intakes are generally hot air intakes, but they do work quite well as "performance" intakes. Now, the big quesion is ................. Is it better to make your intake more of a performance intake by the hole you made or does it do more harm by sucking in hot air. For every 3 degrees increase in intake air temp, you lose about 1 hp to the wheels. Air from where the stock Fit draws from should be about at road temp (a few degrees higher than ambient) but air coming out the back of a radiator once up to operating temps on a hot day can be as hot as 60 to 70 degrees. From an ambient of say, 25 degrees C, that's an increase of about 40 degrees. This would put your engine at a disadvantage of about 13 whp. Does your hole contribute that 13 hp back? No doubt you may achieve better throttle response with that hole, but that doesn't mean much if you're losing hp.

You sure about that?

Regarding the hack job, I've thought about hacking mine apart, but have so far refrained for resale purposes. I did break off that silencer bubble and capped it, which didn't do much...in general I don't think the stock intake is really that restrictive, but anywhere they gave up flow to reduce noise, I'd rather gain flow and live with the sound.

If you really wanted to, you could fashion some form of ducting to cold air from that big opening you just made. Then you may get the best of both worlds.

What is the source of the noise that it is muffling -- just the hiss of the intakes?

Resale value... if the cops can't see it, I guess the buyers can't either. :p

Am I sure that hotter air will adversely affect engine performance? This is pretty common knowledge. Why do you think superchargers and turbo work so much better with intercoolers and aftercoolers. Hot air is less dense. Less dense air has less usable oxygen. As the intake air temp rises, the IAT sensor on your engine will send a signal to your ECU. The ECU will then back off the timing. Guess what happens when the timing is backed off?
Look, I think it was a mistake for me to open my big mouth here. I'm not going to give you a physics lesson on how hot air affects engine performance. I've only got 6 years as the "How To" guy on S2Ki.com and now I've got my own mechanical advice forum on S2KCA.com. I guess I know nothing. I thought I'd come here to learn a few things about the Fit and when I saw this blatantly weird mod, I just had to say something. I apologize for telling you something you don't want to hear. I'll go back to just lurking. I don't need to prove myself all over again for you people. You have fun chopping up your cars because it "feels" good. Who am I to tell you otherwise. Carry on.

bahahahaha short rams give more hp. so I think your theory is wrong. sorry bud.

It's not a theory. You believe what you want to believe. I'm done here.

wow, you really jumped to conclusions there, didn't ya? one person says "you sure about that?" and you dropped the ball. take it easier, we don't all have powerful cars, we're a little more laid back.

I'll let "sonorliteman" explain what he meant by his statement. I may be wrong about it, but you don't really know what he meant either.
A little more "laid back". I come here trying to explain something to you and you guys jump on me for being wrong and telling you something you don't want to hear. How "laid back" is that. Sorry, it just ain't worth it.

Ai ya... i understand the hot air thing... lets see if he dyno's his car, if he gets gains then great. if not, then oh well... it didn't cost him anything to do it, besides having a hole in his stock air box.

This is not entirely the case. If you get the intake air temps hot enough, the a/f gets leaned out to the extent that it will begin to reach the threshold of knock. Then the timing gets affected. You merely put in an intermediary step. The result is the same.

omg I give up. haha we're all wrong you're right. that's why my car runs like shit right now. (its running the best its ever ran)

It's like talking to a sac of turnips.

xviper, i think you're completely right but this mod could almost be just as good as a short ram intake except that the air box is right behind the radiator, which is full of hot air and you're right that hot air really robs hp. for every 7-10 degrees F lost in intake temperature you gain 1% more power. but the thing is once the car starts moving there is not as much hot air coming off of the radiator so what ever power he loses though heat he can make up in better flow, but he can easily run a dryer duct from the airbox straight down and avoid the radiator's hot air

Thank you for at least understanding what I was trying to put forth and for having a bit of reading comprehension to not read only what you want to see. My degrees were in Celsius, so you have confirmed my information. I'm not going to argue this anymore.
I've been given a warning. That's enough for me. This is my last post here. I'm logging off and I will not return. My first foray into this forum has been most disappointing.

dude why do you have to be like that for man? this is what this site lacks is people like you that actually understand about cars. i've read your S2000 specs and it's super crazy and it really seems like what you are doing. Don't let the ignorant people on here keep you from expressing your knowledge about cars. they think that by putting on an intake they will gain like a thousand hp just because they can hear the difference and it plays tricks with their minds. but in reality they've only gain a few hp and a whole lot of noise. It's a shame to see you leave man.

hahahaa Finally he stops his bitching

Wow...didn't intend to start the flaming....xviper, all I was getting at was your statement of 3F per 1 hp. You are spot on in your argument, but my understanding was that it takes a bit more temperature to make that kind of impact, like 10-15 degrees or so, not a 3 degree change. That is all I was questioning (hence why I pinpointed this statement). I think you are correct in your concepts in general. There is a reason all OEMs are designing factory intakes to draw cold air. I'd even go so far as to argue that most new intakes are really not that restrictive either, for a stock engine. I have always wondered how much HP they really are giving up to reduce by x db interior noise. For some reason they think customers don't want to hear intake air. It doesn't bother me! :)

Sorry your first few posts have turned out this way....you'll find very quickly there are quite a few short fuses around here! Nonetheless, the forum is still very informative...just gotta turn on the 'nonsense filter'.

this site doesn't need ppl like him, we all enjoy new knowledge about our cars, but not in correct facts. it was more of an argument than some advice. and who said some1 was excepting a whole lot of hp? I was excepting more like 2-3 hp max, that's nothing big.

one of the 1st things i did to my Fit WAY back in the days... it made about 1.8 more to the wheels with cool sound... haha my hole was not that big though.

oh and about the whole timing issue... this is true if the intake temps get really excessive on the Fit IE fans come on, on a hot day while your sitting a train intersection with a locomotive that never ends. on subarus intake temps are very sensitive and i would see the timing table all over the place with a short ram, especailly after a fan cycle.

I would do this but car is still under warranty and the chances of getting shit into my engine would be doubled.

you cant see it at all from the top, would b kinda hard to catch, and nothing gets into the engine, thats wat the filter is for... ;)

But the pipe on the right. Isn't that the ducting which was used in conjunction with the stock airbox?

Are you planning to just run it the way it is now or are you going to use some piping so it feeds proper cold air into it rather then getting "warmish" air coming past the radiator.

no its jus another pipe which feeds air, I plan to leave that, and yes I plan to mod the box a bit so I dont get alot of that warm air. Just need to find something that will work with the box

air box
 

Wouldn't this also cause the filter to get dirty faster. What's the use of the filter if there is obstruction from all the dirt and dust particles. I don't want to clean the filter that much even if it is a K & N drop in filter.

Well you could always strap like a wire mesh grill underneath which will stop big items being wedged into the filter.

I'm tempted to do this but the fact of the matter is, I'm too weary of the amount of dirt that will enter the panel filter is double that of when the box isn't modded.

On another note, can you imagine the honda mechanic's face when he comes round to changing your filter when you take it in for service? LOL.

Oh yeah, george02, maybe this is something you might want to do. Looking at the picture, the edges of your work is a little rough, maybe it'd look a lot neater if you got like a black tube, cut it on one side and then wrap it around the edges so you get the rounded edge look. Just my 2p.