If you can knock out the box that sits just below the fenderwell, you ought to be able to just drop a cone filter there and run ducting up to the stock airbox. Eliminate the filter there and you'll have yourself the equivalent of a resonator. There's a lot of surplus plumbing in there, snorkels and whatnot.

 

hey thanks for the head up! i took a look at the setup of my model (aust) and the only snorkel is the one that leads from in front of the battery, down to the right of the battery, then directly into the airbox... therse no other resonator there that I could see...?

 

The actual resonator (at least it's called that by Toyota) is below where the hole is in the chassis. The airbox has that funky-shaped pipe out the bottom, and off the middle of that pipe is the snorkel thing that hangs in front of the battery. If you follow the other end of the pipe, it'll go down through the fender and behind the wheelwell, there's a big box down there that's got a scoop at one side (that's what you can kind of see when you look at the front of the car on the bottom R through the grill) and is connected to the pipe and the fender by a couple of bolts and a foam gasket.

 

ah ok, i took another look, are you talking about that pipe that goes around the battery to the air box, are you saying that there is another pipe that leads down to the chassis of the car to another resonator? where can one find access to this box/pipe?

 

There is another pipe that goes down, yes. You have to take a lot of stuff out...the entire airbox, the battery (it's not essential, but it really helps), the 'snorkel' thing, you'll start seeing the plumbing. It's a sort of flattish-contoured pipe that's got a couple of tees on it for (if I remember correctly) the snorkel, the airbox inlet, and then feeds down through the fender. The sub-fender assembly is held on with two bolts up through that chassis hole and then with a brace to the backside of the fenderwell plastics. It may take some time and effort to get out, but it would leave you nicely set up for a CAI...

 

wow okay so i took out the battery and all and saw that other pipe that leads down to that massive resonator which is under the chassis cover which was a bitch to get to, i tried and couldnt get under there, toyota sure did a good job hiding it i might ask the mechanic to try remove it at my next service...for now im going to use the stick setup with the k&n....

 

Jack up the car.
Take the wheel off.
Remove fender liner.
Smash a few holes in the resonator with a hammer.
Now you have made a stock CAI.

 

haha u cant be serious?!

 

As far as I know the box you refer to is not a resonator it's an air box. The resonator sits between the air cleaner housing and the trottle body. The resonator just helps keep the engine quiet.

 

^The part your talking about is also a resonator for the air entering the intake. I left mine alone. But I did remove the other resonator that is under the battery and leads to the air filter box. Both resonators serve the same purpose. To resonate the sound entering the intake.

 

Out of interest, has anyone ever actually tested if this increases air flow and lowers air temp or just makes more noise?

 

prolly just makes more noise. By shortening the distance, it would seem that this would improve performance or possibly fuel economy, but on the other hand, it's now sucking in air closer to the motor which may be alot hotter, so that would not help

 

Yes my lower fender air box was damaged in an accident and I replaced it. I did notice the car was quieter but didn't notice any loss of power.

 

i removed the intake snorkel, from the front down the battery and up the air filter box, now i have more power in mid and high RPM but i have a loss in lower RPM, normal bias or ???

the resonator near the wheel, how to get rid of it?

thanks!

 

Quite an old thread, but thought I'd clear up some common misconceptions about the standard plastic inlet resonator that goes between the throttle body and air filter, as a lot of people seem to think they're there to quieten down the intake roar.

Unlike some parts in the engine bay, they're not there just for the sake of it or to reduce emissions - They're actually designed to match the particular characteristics of the engine and can have a huge effect on the smoothness of the power delivery and bottom-end torque. Most of us remove this part when we replace our intakes with a nice shiny aluminum pipe and pod filter, but by doing this we are actually reducing power.

Removing the inlet resonator will see drops of around 3kW-5kW throughout the entire rev range, with things starting to return to normal around the 6000rpm mark. This has been tested many times on a dyno by technicians, and manufacturers such as ARC now even have inlet resonators side-branched off some of their inlet systems.

A larger inlet resonator will produce slightly better top end results, while a smaller inlet resonator will see slightly better performance in the lower rev range. The differences in power definitely aren't mind blowing, but you should notice better response depending on the size of your resonator. Bear in mind that you must have a clean air filter or you won't see any gains no matter what you do.

So at the end of the day, if you have the option to keep the inlet resonator, do it. If not, then it's no great loss, but a loss nevertheless.

 

including the big box behind the bumper???

 

I've never seen anything like that behind my front bumper so I can't really comment. Are you sure that it's an inlet resonator? Sounds strange because it should be part of the intake between the throttle body and air filter. As far as I know, Corollas only have one, in this country at least.

 

it's very difficult to see/locate.... front of fender LH behind splash guard

 

That box is to collect water that gets in the intake. Here's a pic

 

no, its there to dampen sound.

 

LOLzzzzz

 

Removing any of these boxes does not really do anything noticeable in terms of performance. On an otherwise stock Corolla at least.
The sound changes a tiny bit though. The resonator between the airbox and the throttle body eliminates a rather high pitch noise around (IIRC) 3000-3500RPM. The sound reminds a bit of a vacuum cleaner, although it is not nearly as loud. Well, it might be by itself, but with the engine running it is not that noticeable. Except when one is cruising at that particular RPM for a couple of minutes, then it gets bloody annoying

The bigger box under the fender cancels a deep tone between 2200 and 3000RPM. That tone can only be heard at full throttle.

 

without the little box near the throtle the power curve suffers from lack of torque at all RPM

 

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heres a pic of a CAI... but here is my experience with a CAI you lose low end torch but gain high end torch but not by a high degree you lose the low end torch because remeber it its not a high performance engine so being it has to suck air from all the way down below the wheel well area it takes a coupl secs before it really responds while in high end torch being cold air is coming in you gain a lil more. short ram is ok you have better low end torch bein more air is coming in from a shorter distance but you also induce alot of hot air from the engine so its really dence so i decide to take a leaf from honda and install mine rite nex to the battery just behind the headlight i'll have some pics soon to show you what i mean this way i have cooler air and only lose a slight amount of low end torch but its best of both worlds:thumbsup:

 

Yeah, that is exactly how I have my CAI. Well, in the summer. The air intake temperature is best at 53 degrees F. So, I run the SRI in the winter and the CAI in the summer

 

yea that sounds like a good move.