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It works great !! No negative effects and the sound is awesome !! I nicknamed it the Banshee !!...
I have a 99 Cab with full fabspeeds treatment, fabspeed headers, fabspeed x=pipe with 200 cell cats and fabspeed maxFlows, and prefer the sound of the my 99 Coupe with the factory exhaust and THIS intake setup .
Looks vacuum actuated too? Assuming that opens the valve at a particular RPM? What does that part do thats next to the vacuum unit?
Yes it's vacuum actuated. The vacuum line runs to a electric/mechanical vacuum changeover valve that is controlled with a wireless remote to turn off or on. (but it stays on all the time..lol)
It could possibly be controlled by RPM actuation like Porsche does it, but I see no instances where I would want it off. The remote control I put on was basically useless since I never want it off.
It's hard for me to believe that the 991 guys block this off cause they don't like the sound. To each their own I guess !!
Yes it's vacuum actuated. The vacuum line runs to a electric/mechanical vacuum changeover valve that is controlled with a wireless remote to turn off or on. (but it stays on all the time..lol)
It could possibly be controlled by RPM actuation like Porsche does it, but I see no instances where I would want it off. The remote control I put on was basically useless since I never want it off.
It's hard for me to believe that the 991 guys block this off cause they don't like the sound. To each their own I guess !!
It sounds like they are a different breed... No pun intended
It sounds like they are a different breed... No pun intended
Definitely a different breed . I remember my first impression of the 991 back in 2012, I thought yes, they got the sound right on this thing, not loud or obnoxious, but powerful and exotic sounding, higher pitch and nice timbre.
I have the IPD competition plenum with the larger throttle body which bypasses the resonator. I removed the resonator box from the air filter housing and used a 50mm gripper plug to cap the hole. No issues or whatsoever.
Porschetech3 is this image of a MK1 996 with a 997 engine and 997 deck lid?? I'm so confused!! Intake, power steering pump cap, fan and lid look 997 while the tail pipes, bumper overriders look 996!?
Porschetech3 is this image of a MK1 996 with a 997 engine and 997 deck lid?? I'm so confused!! Intake, power steering pump cap, fan and lid look 997 while the tail pipes, bumper overriders look 996!?
Sorry for the confusion, yea that fist pic was not my car, just one I had installed the same intake and sound symposer on. I was having trouble loading the pics..lol
That is a pic of a 997. I did a couple of 997's and a couple of 996's. The 997's have changed hands a few times but still have the "Banshee intake with Symposer" still installed, the 996's have not changed hands, one is mine, the second pic of the Polar Silver.
Last edited by Porschetech3; 05-24-2018 at 03:06 AM.
That is a pic of a 997. I did a couple of 997's and a couple of 996's. The 997's have changed hands a few times but still have the "Banshee intake with Symposer" still installed, the 996's have not changed hands, one is mine.
Ahhh I see, interesting tail pipes on that 997 then!
The automotive engineer's vocabulary is typically broad and precise, which makes it intriguing to hear the word "emotion" used increasingly when new technologies are introduced. In the case of Porsche's new 911, emotion was cited by engineers as a key factor in developing the car's acoustic signature.
"Sound was a major design and engineering focus," explained Wolfgang Hatz, Porsche's Main Board Member for Research and Development, who also heads VW Group's powertrain development.
At a recent technology workshop for the 2012 Carrera and Carrera S, Hatz and other Porsche engineers noted that creating a unique sound quality "between the engine and the tailpipe" has been a leading criterion for the 911 ever since the iconic sports car's 1963 debut. For the new Type 991 series (see http://www.sae.org/mags/aei/10167), the development team focused on “mechanical engine sounds characterized by high frequencies with tonal elements” together with low-frequency intake noises.
So significant is the 2012 car’s symphony as deemed by Porsche that the interplay between induction and exhaust was part of the car's design and engineering specification. Computer modeling mapping, as well as analysis of the configuration and dimensions of manifolds, pipework, catalytic converters, and mufflers, was carried out at the company’s Weissach Development Center.
The required sonic profile had to satisfy all possible operating states—from engine starting and idling (conveying power without disturbing the neighbors) to wide-open throttle on a racetrack. The goal was not only to deliver the aural “emotions” expected of a 911 but also to provide the driver with feedback about the car’s mechanical status while meeting Europe's 74 dB(A) drive-by noise requirements.
Electronically synthesized noise is not a Porsche solution, so the engineers developed a new Sound Symposer that is standard on both versions of the car. An acoustic channel picks up intake vibrations between the throttle valve and air filter and a membrane incorporated in the channel reinforces the vibrations and transmits them as an engine sound into the cabin. The system is driver activated or deactivated via a “Sport” button that controls a valve ahead of the membrane.
The result is a direct acoustic link between the cabin occupants and the engine, providing optimal transmission of the load-dependent sounds. The sound of gearshifts can also be enhanced.
The Sound Symposer incorporates a tunable Helmholtz resonator to achieve an harmonious sound pattern, damping out unpleasant noise occurring at around 5000 rpm.
If the Sound Symposer is deactivated, an aperture in the air filter housing still allows the basic engine and exhaust tones to be heard—"because we don’t want it to sound boring!” explained Dr. Bernhard Pfäfflin, General Manager of the Noise and Vibration Department.
Interesting, BMW calls their Helmholtz box a "muffler-silencer" in the parts catalog. My e39 had one on the intake boot and while quieting intake wooosh, it got in the way of anything you’re trying to do on the driver’s side of the engine. If you want to remove the airbox, you either have to remove everything from the intake to the fender wall as one piece or remove the 'muffler-silencer" box which is a PITA.
I guess BMW decided that the less genteel e46 owners didn’t need their wooosh silenced because the e46 part for the exact same engine, has no box. I went with the non-Helmholtz e46 intake boot.
05-23-2018, 12:42 AM
