Hi all,
has anyone modded their 2nd gen airbox and if so, how. Lokking at a couple possibilities myself but thought i'd check to see if anyone else has done this yet. I have no idea how these engines can breath through the headlight? Can there be enough air getting through. I have been looking at possibly mounting a hood scoop on the lower front of the hood. Would more air help that much though?
TIA
Steve:pig: :tomcat: we're coming Osama, hold on

 

I took mine out and installed a K&N FIPK Kit. You might be able to do a deckplate mod on it if you get a deckplate that will fit on it. I didn't really do much research on that because I was nervous about cutting a hole in my airbox, and if it didn't work, i'd have to buy a new one. So I dropped the $200 and got the FIPK kit, and it definitely gave me a large performance gain. Despite what some people have said, I've had mine on for close to 8 months now, and I have not had one problem with it (well I did have a problem because my FIPK didn't come with the right size bolts, and after an offroading trip my FIPK was just held on by one bolt So I got the right size bolts and now all is well with it ) The only side effect is that when you're idling it sounds like your radiator is spilling over (air hissing pretty much) but from what i've heard it's normal.

It's not really a mod to the airbox, it just replaces it, but I still consider it a mod, and I think it's a good one that is worth the money if you need some extra horsepower and a nice sound (the sound goes VERY well with a new exhaust system )

Good luck with it!

-Braden

 

I've never heard of anybody modding the air box other than the full fipk kit or a snorkel. Either way, I doubt it will do much in terms of power. It's certainly not worth the trouble of installing a hood scoop.

The most bang for your buck for the 3.0 is headers, but that's a lot of bucks.

Steve

 

I do have a cone filter but there is so little room in the engine bay thatunless you can get more cool air in there i don't know if it's worth putting it on. How much of a boost would you say that your fipk kit added?

 

I do have a cone filter but there is so little room in the engine bay thatunless you can get more cool air in there i don't know if it's worth putting it on. How much of a boost would you say that your fipk kit added?

 

I have no idea what the actual horsepower gain was, but it is definitely a very noticeable difference. It's definitely helped me when i'm going from a dead stop, and it also has helped considerably while trying to pass on the freeway, or going up hills. In my '91 4Runner there's enough room the way the FIPK mounts up, all around the cone filter there is atleast 4" on all sides of it, and it gets plenty of air.

-Braden

 

I REALLY think you all should read this thread. It discusses the K & N Kit that you guys are talking about, and the deckplate mod that cuts a hole in the airbox. It has been proven that the deckplate mod with an Amsoil filter delivers more bang for the buck than the K & N FIPK kit. There have been also quite a few tests that show the stock filter setup doing better than a FIPK kit.

 

hmm, but, i havent heard of a deckplate mod being performed on a 2nd gen. also, i dont think that amsoil makes a filter to fit a 2nd gen either. then again, i could be completely wrong. ..just what i have heard. what other options are there besides the K&N FIPK kit?

 

cyber- The K&N FIPK Kit I've been talking about completely replaces the stock airbox. It's not just an airfilter, you completely take out the stock airbox and put add a new elbox connecting to the throttle body and then you attach a large cone air filter to the new hardware WITHOUT the airbox. No where in that thread does anyone mention a K&N FIPK Kit, they just talk about how an amsoil filter is better than a K&N Filter, which from what I've seen and read, I agree. BUT Amsoil doesn't and can't make a filter for 2nd Gen 4Runners, and the don't make one that will fit onto a K&N FIPK Kit that i'm aware of.

I don't have any dyno tests to prove this, but i'm going by how my truck handled before and after I installed the K&N FIPK Kit, and the K&N FIPK Kit completely blows away the stock filter setup. I gained quite a bit of power by installing it.

Here's a picture of the FIPK setup the top left is how the stock airbox works, and the bottom left shows how the K&N FIPK works, pretty much all cold air intakes work like this from what i've seen...

the top right is the setup that they make for 2nd Gen 4Runners despite the picture it also comes with a new elbow to connect to the throttle body, i'm not sure about the bottom right, but it's essentially the same thing, only with a heatshield built in, where that black plastic part behind the driver side headlight acts as somewhat of a heat shield.

I don't mean to sound argumentive here cyber, but you're wrong.

-Braden

 

I've had a FIPK on my 93 for at least 4 years. This thing has helped performance NOTICABLY. Will you get neck snapping acceleration from add it? No. It will be better off the line and through the mid range. I've noticed mine is similar to stock power levels when cruising at highway speeds and punching it. I have a Borla stainless cat back exhaust. I've been reasonably happy with the combo. My next step will be NWOR headers, high flow cat, and big bore throttle body from DOA Racing. Since were on the subject of 3VZE engine performance, what amount of overbore should I go with on the throttle body? DOA will do from 3mm to 6mm.

 

I'd like to install a FIPK like the one pictured, but I think it would suck up lots of mud and water when i take the truck offroad, dont you?

 

Adam,

I've only had water up to my frame rails before, no deeper. I haven't had a problem with mud. The filter is semi protected where the FIPK mounts it. I've thought about adding a shield on the engine side to protect it a little better, but I haven't had any issues yet. Is there some good wheelin' in Cinci?

 

Where I live (Southern California) we don't get lots of mud, and there aren't many places where I have to go through water. But yeah that is the one main problem that I've read about for the FIPK Kit. Where I go offroading it's mainly just dust that I have to worry about, but I usually clean the FIPK Filter every other oil change, and if i've done some offroading, i'll usually clean it the next oil change even if I had cleaned it with the last oil change. But yeah Adam if you plan on going through a lot of water and mud, then I wouldn't do the FIPK, I'd look into making a deckplate for it if it's possible.

-Braden

 

No good wheeling in Cincy, but 2.5 hours to Livingston Kentucky there is killer wheeling.


My engine bay gets COVERED in mud, and water sometimes gets up to the hood.

 

If your engine bay gets covered in mud, DON'T do the FIPK or any other intake where the filter is exposed (unless it's a deckplate where it's water tight). I'd probably look into doing a deckplate mod if you can, because that's the only other option that i'm aware of besides stock.

-Braden

 

Hey Cebby,

I've heard that a 3mm overbore is the max you want to do the Throttle body before you have to get into changing other stuff in a serious way. I think it may mention something on DOA's web-site to that effect.

Anyways, let me know how that works out for you as I"m looking to get that done too.

Warren

 

I just got an email back from them today where I asked the same question. He siad 3-4mm for street 5-6mm for race. If you do a 5-6mm, he siad it will have to idle around 1500rpm to keep running...:eek:

3mm sounds like the safe bet for drivability.

They are working on a weber carb conversion for the 3VZE (3 - two barrels) with a sheetmetal manifold. I wonder what kind of hp gains that will bring?

 

Check out Gadget's website about air induction. There are many dyno tests on there, one includes the FIPK. The results were that the FIPK has an average loss of .06 HP. The numbers don't lie.

 

Well Cyber, I'm not disputing the numbers, but on my truck, when I installed the FIPK on my truck, it gave me MORE power, not less. Also Gadget's test was on a 3rd Gen 4Runner (3.4L Engine with a Supercharger) I'm driving a 2nd Gen (3.0L Engine, with no supercharger) And on mine the FIPK gave me a very noticable power increase. I'm sorry to argue about this, but the performance gain after I installed the FIPK on a pretty much stock 2nd Gen 4Runner (1991) speaks for itself. I've read that it's not good to have the FIPK kit on a Supercharged engine, because it allows too much air in, and the engine doens't know what to do with it. But on a NON Supercharged Engine (Or maybe it's just because it's a different engine) the FIPK gives a very nice boost in power. So i'm sorry, but you're wrong in the case of 2nd Gen 4Runners. But yes I agree with you that I think that Gadget is right about the FIPK on a 3rd Gen Supercharged engine, but he didn't say anything about how it performs on a 2nd Gen, so that's what I (and Cebby) were stating here, how our FIPKs have given us a nice boost in power.

-Braden

 

Hey, I was just passing along the info that I had read, and not trying to say you are wrong. The data that I read does indicate that the tested configuration had a power loss. Your vehicle is obviously different if the engine (and any mods) are different from the one tested. I was mainly just checking on the data because I wanted to be sure that I got the best thing that I did for my vehicle. My father has the FIPK on his 99 and loves it.

Just trying to educate people that may benefit from knowing all the facts. Both your info and mine, has been helpful for somebody I'm sure

So the FIPK is great on the 2nd gen, and not as good on the 3rd or with a super charger. At least folks know that now!