THE Air Intake Thread

[SeaWolfLestat]

I wanna thank Apex Chase, Apex Victoria and the authors of the follwing threads:
http://www.camaro5.com/forums/showth...24#post4097924
http://www.camaro5.com/forums/showth...iy+washer+tank
Edgar3 and KlutchCargo. These threads were very helpful.

[Apex Motorsports]

Originally Posted by SeaWolfLestat

Installed my Vmax TB, CAI cai, and Apex scoop and washer resevoir relocate kit this week.
Looks really good and I can feel an improvement in throttle response and power.
Still not getting the neck snapping torque I was hoping for.
The car is soooooo smooth.
I feel like I'm driving a Cadillac... A Cadillac wth a loud exhaust..
But a Caddy none-the-less.

Originally Posted by SeaWolfLestat

I wanna thank Apex Chase, Apex Victoria and the authors of the follwing threads:
http://www.camaro5.com/forums/showth...24#post4097924
http://www.camaro5.com/forums/showth...iy+washer+tank
Edgar3 and KlutchCargo. These threads were very helpful.

Glad to hear that you are enjoying the mods and the thread was helpful. Congrats on the upgrade.

[Sales @ CAI Inc]

Originally Posted by SeaWolfLestat

I wanna thank Apex Chase, Apex Victoria and the authors of the follwing threads:
http://www.camaro5.com/forums/showth...24#post4097924
http://www.camaro5.com/forums/showth...iy+washer+tank
Edgar3 and KlutchCargo. These threads were very helpful.

Thanks for choosing Cold Air Inductions Inc., it looks great!!

Don't forget to remove the label covering up the badge on the CAI lid, I just noticed it in the pics you posted

Thanks and take care!

[SeaWolfLestat]

Originally Posted by Sales @ CAI Inc

Thanks for choosing Cold Air Inductions Inc., it looks great!!

Don't forget to remove the label covering up the badge on the CAI lid, I just noticed it in the pics you posted

Thanks and take care!

I am not quite finished. Need to add the catch can and a few other tweaks.
Once i do that I will detail the bay and THEN, I will remove the sticker to
announce to the world who my cai's manufacturer is.

It is a beautiful product and it definately makes the car more powerful.
I love the way I can hear the air box depressurize when I turn the ignition off.

[911medic]

Originally Posted by SeaWolfLestat

I love the way I can hear the air box depressurize when I turn the ignition off.

Please explain. The whole bottom of the box is open to take air in from outside the engine bay, correct? There's no way for it to hold pressure (or vacuum, for that matter, which is really what would happen).

[Apex Motorsports]

Originally Posted by 911medic

Please explain. The whole bottom of the box is open to take air in from outside the engine bay, correct? There's no way for it to hold pressure (or vacuum, for that matter, which is really what would happen).

Immediately after you turn off the car there is a "PSSSsssss" sound from the intake. That sound is probably what he is referring to.

[911medic]

I have not heard that before. I wonder what the source is.

[rontammy0]

Originally Posted by 911medic

I have not heard that before. I wonder what the source is.

It's the air trapped in the tube escaping out the filter once the tb is closed I believe.

[Firefighter]

I have that too. It also became more pronounced with the Ported TB.

ADM Race Intake with a Vmax TB on an LS3.

Sent from my DROID RAZR HD using Tapatalk

[911medic]

Originally Posted by rontammy0

It's the air trapped in the tube escaping out the filter once the tb is closed I believe.

Hmmm. I'm trying to understand the physics here, and can't wrap my analytical brain around it.

Until you get to the intake valves themselves, nothing in the intake is sealed to any degree that would hold pressure or trap air. The air box is open to outside air. The air filter media allows air to freely pass through. The throttle body plate does not seal when closed--particularly the ported TB, which has more gap around the plate edge than the stock TB, thanks to the porting process.

I'm not saying it doesn't happen, I just don't get why it does.

I wonder instead if it's some fuel pressure bleed off that's occurring, and echoing back out the more open intake.

[rontammy0]

Originally Posted by 911medic

Hmmm. I'm trying to understand the physics here, and can't wrap my analytical brain around it.

Until you get to the intake valves themselves, nothing in the intake is sealed to any degree that would hold pressure or trap air. The air box is open to outside air. The air filter media allows air to freely pass through. The throttle body plate does not seal when closed--particularly the ported TB, which has more gap around the plate edge than the stock TB, thanks to the porting process.

I'm not saying it doesn't happen, I just don't get why it does.

I wonder instead if it's some fuel pressure bleed off that's occurring, and echoing back out the more open intake.

I researched this before when I heard it myself..I didn't hear it inside the car but when my wife pulled the car into the garage one night I heard it. Maybe it's not from the tb closing but just the amount of air being pulled into the tube ..once the car is shut off that air has to go somewhere. You could be right for sure. I can't find where I read that...that why I ended with I believe. I've really no seen much posted about this..if anyone knows for sure the will educate us

[Apex Motorsports]

I contacted a few of the intake manufacturers yesterday and none of them had a solid answer to what the cause of that sound is. Just theories but none of them ever had any reason to research it in depth. In my experience it is something that occurs with any aftermarket intake system. I have noticed it on every kind of vehicle from Saturns to Silverados. I would be interested to know the answer though.

[SeaWolfLestat]

Originally Posted by Apex Chase

I contacted a few of the intake manufacturers yesterday and none of them had a solid answer to what the cause of that sound is. Just theories but none of them ever had any reason to research it in depth. In my experience it is something that occurs with any aftermarket intake system. I have noticed it on every kind of vehicle from Saturns to Silverados. I would be interested to know the answer though.

The fact that u have one air mass is actively being pulled into the intake
and another air mass surrounding it will cause a pressure differential.

This is in fact what allows aircraft to fly:
If you have faster moving air on top of the wing and slower moving air under the wing.
The faster moving air is at a lower pressure than the slower air under the wing, which is at a higher pressure producing lift.
Its called the Bernoulli effect.

I am certain the pressure inside the intake and air box is lower than the air surronding it outside the car and inside the engine bay.

I can see the higher pressure air rushing to the lower pressure air mass creating this sound.

[911medic]

While I get your meaning, I don't think it applies here. Air at atmospheric pressure is rushing into the vacuum created by the intake continuously while the motor runs. This produces, in part, the intake noise we hear, and which is more pronounced with a cold air intake.

However, as soon as the engine vacuum is turned off, the intake returns to atmospheric pressure immediately. There is no sealed area that has to bleed off over the course of a few seconds, and as such this return to atmospheric pressure is virtually instantaneous, and should not generate a noise that persists after the engine is turned off.

While I have had college level physics courses (including learning about Bernoulli's principle), I am not a physicist, and certainly could be wrong. But if air pressure or vacuum bleed off is the source of this sound, I have to think it's produced by something other than the air box, intake tube, or intake manifold.