aftermarket CAI Box with Airdoc Intake?
Super Moderator
Joined: Jul 2007
Posts: 13,105
From: Boat Town USA MI
I don't see where you gained performance? You still have 3'' inlet restriction from the air box, removed the resonator, and it appears you used a steel air pipe, which will absorb heat rather easily, and increase the temperature of the air flowing into the throttle body.
The I5s respond very well to an Intake.
Senior Member
Joined: Jul 2012
Posts: 9,024
From: C-Town
Didn't read my last post Aye? The source of the Air Charge, velocity and shape of the intake are far more important than the material out of which it is made. I drive with intake temp indicator on my dash, our intakes run within 2-3F of outside ambient temp. Been recording that for almost 12 years.
The I5s respond very well to an Intake.
The I5s respond very well to an Intake.
In the pic above, air flows through 3" tubing, then increases to 3-1/2".
That reduces velocity!
A leaf blower is an example of how to increase velocity:
The material used for the Air Charge is important!
Look at how a hot air gun operates, air pulls in and flows across a heating element and out through a nozzle.
Touch the handle or body and it stays cool, however if you touch the nozzle, you will get burned!
The I5 air intake tube is above the exhaust manifold, therefore anything metallic will absorb heat rather easily, and increase the temperature of the air flowing into the throttle body, which defeats the purpose of the CAI.
As I posted above: Increase the amount of cold air intake, to the airbox, then the velocity will increase on exit.
The main thing: keep the air cool!
Last edited by hummerz; Aug 12, 2019 at 07:16 PM.
Senior Member
Joined: Jul 2012
Posts: 9,024
From: C-Town
If you wan't to see the performance loss removing the resonator, check this out:
Senior Member
Joined: Jul 2012
Posts: 9,024
From: C-Town
Senior Member
Joined: May 2015
Posts: 210
From: Texas
Rush Limbaugh is worth $$500million$$ and a Republican, however this is not a political forum. 
Super Moderator
Joined: Jul 2007
Posts: 13,105
From: Boat Town USA MI
Above is not about the resonator, it's about CAI.
If you wan't to see the performance loss removing the resonator, check this out:
https://www.youtube.com/watch?v=OliY7_Iq9Aw
If you wan't to see the performance loss removing the resonator, check this out:
https://www.youtube.com/watch?v=OliY7_Iq9Aw
Doesn't look like an H3. So the relevance would be.... uhm......... zero.
Super Moderator
Joined: Jul 2007
Posts: 13,105
From: Boat Town USA MI
Your "it is metal therefore it transfers heat" is a common misconception.... just isn't fact. Spend some time testing that assumption and you will be embarrassed you made the comment.
Many other intake manufacturers make steel and aluminum intake pipes, material is not as important as shape and source, not even close.
Velocity and volume is increased by using a smooth inside surface vs the stock accordion couplers and resonator.
Many other intake manufacturers make steel and aluminum intake pipes, material is not as important as shape and source, not even close.
Velocity and volume is increased by using a smooth inside surface vs the stock accordion couplers and resonator.
