Sure haven't...

So everyone that isn't getting performance from their cone filters, do you have na's? When i installed mine it pulled noticeably harder and then when it got cold outside (30 degrees) It was like a whole other car. But it does get heat soak easier cuz of no shield

It made a noticeable difference on my NA. Maybe my old filter was clogged but it does seem faster now.

there certainly is intake roar when its not muffled by a convoluted intake path designed to subdue the noise.

on my individually throttled fc, the intake was louder than the exhaust before I put an air box on it.

I actually posted an experiment where i put a thermocouple thermometer lead in right after the air filter in:

1. stock intake (unmodified)
2. cone filter in stock air-box location
3. fenderwell CAI

The stock intake had much more temp gain over ambient than both of those, with the fenderwell CAI only a few degrees above ambient temps. Needless to say i kept the CAI setup. :)

https://www.rx7club.com/showthread.p...ghlight=intake

I have the Bonez. I don't have a cold air box but I have managed to route two ducts/hoses from the front of the car(same opening the rad gets air from) to bring cool air to it. I'm sure it does work because after diving at highway speeds I can open the hood and the filter is quiet cool. Does nothing for heat soak in traffic or slow speeds I'm sure. This picture is old. Before I got the second hose in there. I need to build a cold air box, just never have. For me I don't veiw it as a waste of money but others may.

Interesting- never heard of a set up like that.

+1

To the original poster:

An intake is worth it if you take the time to do it right. Either have a cone filter and make a proper heat shield for it or make a true cai. But to yield maximum power from intake or exhaust upgrades, one would need proper fuel management and tuning as well. If you just put a cone filter in your engine bay sucking in hot air from your engine, you are dumb. There are a ton of threads on this subject, many of which have pictures, detailing peoples intake setups.

To Tunsoffun65: An exhaust upgrade on these cars would yield a much greater increase in power than an intake upgrade if what you are looking for is power. Exhaust is definitley more important than intake, although both need to be taken into consideration when your goal is getting maximum power from your car. Also, depending on which exhaust you go with, can drop quite a bit of weight at the same time, whereas with intake you maybe save 2lbs, if that.

^^^Yea thats why i did my entire exhaust system first- excellent bolt-on upgrade in terms of weight savings and power gains for an N/A fc

here is a cold air box setup, It's not cheap but there is a lot of work to make one of these.
http://www.rotaryengine.ca/productpa...9456intake.htm

thats rediculus, you could make one just as efficient for 1/3rd of that. just do a cai and a box. higher flow is better no matter what. i have a cai right now just sitting in the open right behind the headlight. i saw a power increase and better gas milesge. i even put the stock airbox back on for a week and there was a definate difference. im building a box out of aluminum right now. once i get schematics done ill post em.

Intake sounds are a VERY significant part of the overall sound your engine makes. Listen to any car that has open Individual Throttlebodies versus a car with stock, or CAI intake. There is a significant difference in sound an volume.


BC

You're comparing apples and oranges. ITB's aren't exactly the same thing as putting a cone on a car. Now, whether or not putting a cone on a car does change the sound enough for it to be distinguishable, I have no idea. But, you can't compare ITB's with cones/stock.

it makes more noise when you remove the air box and put a cone on it.... it also makes more noise when you just cut a hole in the top of the air box.

if you can't hear the difference your exhaust is too loud or you're deaf... with the air box cut open or a cone filter on an NA the front of the car will roar at WOT after the aux ports open up.

speaking from experience, and in this context i wouldnt consider bringing itbs into the picture apples to oranges, it's the same shit, just itbs are a shorter intake tract usually with less of the noise cancelling nonsense the stock intake puts between your ears and the intake ports.

It proves the point, which is all that matters, by jumping to the extreme opposite end of the spectrum. Switching to a cone or modding the intake slightly will just change the sound a little bit, generally the more stuff you remove from the intake tract, more of the sound gets to your ears.

The stock air box is designed to quiet down the intake, most of the techniques to quiet it down do hurt performance albeit pretty minimal especially on a stock car. All those ribs on the inside of your air box, they diffuse the sound waves (and make the box walls more rigid..)... just smoothing out the inside of the box will affect the sound of the intake... not as much as going to a cone or running an open box, but still alters it.

What do you think the DEI and VDI systems are taking advantage of? Those pulses that the intakes are tuned to harness are noisy when they get to your ears!

1. I run a straight through exhaust so I probably couldn't hear a difference. :p:

2. Thanks for posting up a good reply. That clears a lot up for me. :icon_tup:

Does the car in that picture have the same TID hardpipe that you get off of ebay? Or did he make that one?

woops....nvm.... i didn't scroll down to the bottum :squint:

Here's an idea that someone could try if the intake noise bothers them:

Almost all cars and trucks built nowadays use what is called a "resonance chamber" mounted somewhere along the intake tract. Most often it is a plastic "box" or a contoured plastic molded enclosure that is part of the intake piping or is clamped to it. The idea is to "cancel out" the sound waves, usually in the midbass region so you don't hear the "wooooooaaaaahh" sound during acceleration. I'd bet you can find several types of these chambers at salvage yards all day long. All that would need to be done is to "tee" it into the intake hose between the TB and filter. It shouldn't degrade power, as it is not a direct restriction. A good example of this box would be a 90's Mazda mx-6 or 626. It has a plastic box in between the air cleaner box and the TB. It's only purpose is noise cancellation.