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Old 12-20-2009, 01:01 PM   #11 (permalink)
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Quote:
Originally Posted by Christ View Post
It's not even close. You'd actually have to see it to understand why it's necessary.
Very interesting... Do you know where one could find pictures? Might even be something that could be engineered to fit vehicles that don't come with this stock (mine). Like I said before, whatever works..

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Old 12-20-2009, 01:06 PM   #12 (permalink)
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Look up DPFI intake for a D15B2 engine in a Honda Civic.

I don't think I have any more of the plenums laying around.

Basically, the intake pipe intersects so that the air is forced to move in a spiral pattern through the round plenum, creating a vortex in the intake throat (whirlpool shape) that allows air to pack into the intake slightly pressurized. The piece of metal in there is to ensure that after one full turn, the spinning air doesn't mix with the incoming, instable air, defeating the whole intake setup.

If you remove it, Centrifugal force keeps the air moving outward instead of directing it into the throat, so the swirled air collides with the incoming air, making a huge restriction.

The throat is at a 90* angle to the intake pipe, which is why they made the design that way.
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Old 12-20-2009, 03:08 PM   #13 (permalink)
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Quote:
Originally Posted by JasonG View Post
On Saturn S series, it really makes them sound good.
In the winter it raises the IAT a bit but not like a real WAI.
I took mine off to use as the intake for my WAI :



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Old 12-20-2009, 10:56 PM   #14 (permalink)
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This mod is very common with the European owners of Vectra and Astra cars.
the "doof , doof" baseball cap backwards wearing brigade.

It is generally known as the "three pipe mod" when all three resonators are removed and the the intake pipe sealed.

The upside is...
1) it makes more noise ,
2) there are bragging rights
("I've done the three pipe mod you know" - ie "I worked out with a hacksaw and a roll of duct tape what the engineers at GM with dynomometer cells and Cray super computers couldn't")
3) weight reduction !

The downside is...
1) it makes more noise , and
2) it makes LESS power.

GM have actually worked all this out before the put the car in the show room!

Keep in mind too EVERY bit of plastic costs money to make and install.
If it is there it is most likely there for a good reason.

Pete.

Last edited by Peter7307; 12-20-2009 at 11:03 PM..
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Old 12-20-2009, 11:51 PM   #15 (permalink)
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Quote:
Originally Posted by Peter7307 View Post
This mod is very common with the European owners of Vectra and Astra cars.
the "doof , doof" baseball cap backwards wearing brigade.

It is generally known as the "three pipe mod" when all three resonators are removed and the the intake pipe sealed.

The upside is...
1) it makes more noise ,
2) there are bragging rights
("I've done the three pipe mod you know" - ie "I worked out with a hacksaw and a roll of duct tape what the engineers at GM with dynomometer cells and Cray super computers couldn't")
3) weight reduction !

The downside is...
1) it makes more noise , and
2) it makes LESS power.

GM have actually worked all this out before the put the car in the show room!

Keep in mind too EVERY bit of plastic costs money to make and install.
If it is there it is most likely there for a good reason.

Pete.
The reason is NVH. Noise, Vibration, Harshness. It has little if anything to do with power, since the resonators are usually placed in such a way that they don't restrict airflow at all, only allowing sonic waves a place to reflect into each other, canceling themselves out.

You're right, GM has worked this stuff out, and they've turned it, like everything else, into a compromise. They spend the pennies to win the dollars, my friend. Many people won't buy a car that makes noise under the hood. That would be perceived as something "wrong" with the car by most.
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Old 12-21-2009, 11:29 PM   #16 (permalink)
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Quote:
Originally Posted by Rainh2o View Post
Anyone ever removed the air intake resonator on their car? Did it improve mpg or just get noisy?
in my own it got very noisy, but the ecu learned a new curve, for same fuel.
It had to be removed once porting and opeing air/fuel stuff to larger. it seems a precise muffle...
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Old 01-24-2012, 10:28 PM   #17 (permalink)
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Quote:
Originally Posted by RobertSmalls View Post
Someone once did a semi-scientific study of this on the Insight, climbing a hill repeatedly with and without the resonator. Removing the resonator reduces horsepower at any given throttle angle between 1000-1500RPM, but has no discernable impact on engine efficiency.

I tell you what, though, once I removed mine, I could hear the engine better. It's hard to tell what the engine is up to when you can barely hear it.
Hey Robert, this is old stuff I realize, but I'm wondering if you worked any with a warm air intake after removing the resonator?

Jim E

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