Originally Posted by GZ3 (Post 633489)

Sorry man, M370 is what I **guesss** they are calling the intake manifold. As far as your question about ART which stand for Advanced Resonance tunning pipes...well they are like test pipes with an extra chamber. They make more power than HFC's and Straight pipes!! Here is the description from Hydrazaine as posted on another website when the ART pipes first came out:
In my early days as a rocket scientist designing the R-4D-16 dual mode rocket engine for JPL there were all kinds of challenges in ensuring the performance and reliability of our rocket engines.

One of the greatest challenges was designing an injector to produce smooth and stable combustion of the fuel and oxidizer in the combustion chamber. There were occasionally these acoustic instabilities (tangential modes) in the combustion chamber that could be excited and start a run away condition that could quickly destroy the engine. To address this problem I used Helmholtz resonators inside the rocket engine to damp out the acoustic tangential modes. A tangential mode is basically a shockwave that would spin around the inner circumference of the combustion chamber analogous to a supersonic tornado at 20K Hz. Not unlike detonation, this tangential mode would scrub off the boundary layer, radically increase the heat transfer into the chamber walls and result in a catastrophic failure.

Helmholtz resonators were the solution to these tangential waves. By properly tuning the Helmholtz resonator to the frequency of the tangential mode you could either magnify or eliminate the shockwave.

The R-4D-16 rocket engine design was (is) very successful and is being used by nearly every branch of the US military for Hydrazine / Nitrogen tetroxide liquid bi-propellant propellant systems. Many are in space flight now.

I co-authored a paper on the rocket engine and submitted it to the American Institute of Aeronautics and Astronautics (AIAA). The paper was published and ended up winning "Best Propulsion Paper of the Year" at the 2001 AIAA Joint Propulsion Conference. After studying the application of Helmholtz resonators in depth I began to see how they could be used in a range of different applications. Particularly in automotive. If you have ever studied the science/art of header design it becomes clear that it is all about the interaction of acoustics and engine dynamics. Headers are a way of resonance tuning acoustics to the engine.

By this same reasoning, a Helmholtz resonator could be designed to operate in phase or out of phase with the engine at any given RPM. By transferring the science of rocket propulsion based Helmholtz resonators to the automotive sciences, Advanced Resonance Tuning can be made to enhance performance on essentially any kind of reciprocating engine.

These can be used on a fully modified exhaust system to make additional power. Traditionally, if you already have an intake mod, headers, test pipes with a full catback exhaust and tune, that was the end of the line. There was no more left to gain. ...But not any more.


This is Motordyne's debut of the patent pending Advanced Resonance Tuning (TM). ART is a new way of enhancing the power curve on any engine.

They're not headers. They're not test pipes. They're ART pipes!

Originally Posted by Zsteve (Post 633595)

F ART pipes, we want performance pipes.

Originally Posted by GZ3 (Post 633601)

?

Originally Posted by GZ3 (Post 633646)

Oh, haha! Yes on 350z they made really good gains OVER test pipes. So for someone coming from stock cats, the Diff was Huuge. Mod for mod no other company on the 350z made more gains than motordyne. IIRC...so I can only imagine what they will do with the already very mod friendly 370Z!

Originally Posted by GZ3 (Post 633489)

Sorry man, M370 is what I **guesss** they are calling the intake manifold. As far as your question about ART which stand for Advanced Resonance tunning pipes...well they are like test pipes with an extra chamber. They make more power than HFC's and Straight pipes!! Here is the description from Hydrazaine as posted on another website when the ART pipes first came out:
In my early days as a rocket scientist designing the R-4D-16 dual mode rocket engine for JPL there were all kinds of challenges in ensuring the performance and reliability of our rocket engines.

One of the greatest challenges was designing an injector to produce smooth and stable combustion of the fuel and oxidizer in the combustion chamber. There were occasionally these acoustic instabilities (tangential modes) in the combustion chamber that could be excited and start a run away condition that could quickly destroy the engine. To address this problem I used Helmholtz resonators inside the rocket engine to damp out the acoustic tangential modes. A tangential mode is basically a shockwave that would spin around the inner circumference of the combustion chamber analogous to a supersonic tornado at 20K Hz. Not unlike detonation, this tangential mode would scrub off the boundary layer, radically increase the heat transfer into the chamber walls and result in a catastrophic failure.

Helmholtz resonators were the solution to these tangential waves. By properly tuning the Helmholtz resonator to the frequency of the tangential mode you could either magnify or eliminate the shockwave.

The R-4D-16 rocket engine design was (is) very successful and is being used by nearly every branch of the US military for Hydrazine / Nitrogen tetroxide liquid bi-propellant propellant systems. Many are in space flight now.

I co-authored a paper on the rocket engine and submitted it to the American Institute of Aeronautics and Astronautics (AIAA). The paper was published and ended up winning "Best Propulsion Paper of the Year" at the 2001 AIAA Joint Propulsion Conference. After studying the application of Helmholtz resonators in depth I began to see how they could be used in a range of different applications. Particularly in automotive. If you have ever studied the science/art of header design it becomes clear that it is all about the interaction of acoustics and engine dynamics. Headers are a way of resonance tuning acoustics to the engine.

By this same reasoning, a Helmholtz resonator could be designed to operate in phase or out of phase with the engine at any given RPM. By transferring the science of rocket propulsion based Helmholtz resonators to the automotive sciences, Advanced Resonance Tuning can be made to enhance performance on essentially any kind of reciprocating engine.

These can be used on a fully modified exhaust system to make additional power. Traditionally, if you already have an intake mod, headers, test pipes with a full catback exhaust and tune, that was the end of the line. There was no more left to gain. ...But not any more.


This is Motordyne's debut of the patent pending Advanced Resonance Tuning (TM). ART is a new way of enhancing the power curve on any engine.

They're not headers. They're not test pipes. They're ART pipes!

Originally Posted by NYBladeZ (Post 634956)

To be honest I definitely think the ART's will be superior over stock cats (isn't everything) and many test pipes out there but I've already bought proven long tube headers and I don't see any potential for huge differences. However I still need a catback and I'm going to wait on motordynes offering.