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YOUR RESEARCHRemoving Hemlholtz resonator - capping of the hole in airbox
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Install car chemistry inserts
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Due to drone I installed Car Chemistry inserts which got rid of the drone, but must have changed the exhaust flow rates a little and I'm getting some of the sounds as described in the this other response.
Removing Hemlholtz resonator - capping of the hole in airbox
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Leading evidence: 'Install car chemistry inserts' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Install car chemistry inserts' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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I did the muffler delete, it was a bit too droney, so I installed the CC inserts.
Removing Hemlholtz resonator - capping of the hole in airbox
Install on this neck
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However then I will need something else to close the hole in the airbox as in the current situation the neck of the resonator sticks through the hole, the IPD cap is fitted on this neck.
Removing Hemlholtz resonator - capping of the hole in airbox
Run ipd competition plenum and 82mm throttle body
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I am running the IPD Competition plenum and 82mm throttle body.
Removing Hemlholtz resonator - capping of the hole in airbox
Use before starting this thread i came across this post
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after some googling with slight different keywords then I used before starting this thread I came across this post
Removing Hemlholtz resonator - capping of the hole in airbox
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Install car chemistry inserts
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Performed · outcome unconfirmed
Due to drone I installed Car Chemistry inserts which got rid of the drone, but must have changed the exhaust flow rates a little and I'm getting some of the sounds as described in the this other response.
Removing Hemlholtz resonator - capping of the hole in airbox
Install on this neck
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
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Read evidence and context
Discussions that performed work without a confirmed outcome
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
However then I will need something else to close the hole in the airbox as in the current situation the neck of the resonator sticks through the hole, the IPD cap is fitted on this neck.
Removing Hemlholtz resonator - capping of the hole in airbox
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I am running the IPD Competition plenum and 82mm throttle body.
The IPD-kit comes with a silicon hose to fit the bigger TB. This hose by-passes the Helmholtz resonator. There is a flexible silicone cap to close the open hole of resonator box. Just to prevent dirt to enter, as the box itself is closed off from the airbox itself.
The nicest solution would be to remove the resonator chamber complety from the inside of the air-filter box. as it will free up some space above the filter for air to flow. However then I will need something else to close the hole in the airbox as in the current situation the neck of the resonator sticks through the hole, the IPD cap is fitted on this neck. When removing the box there will be no support to mount something on.
I have seen the so called 'orange cap' suggested. But this cap is unavailable. Any other DIY alternatives that will work?
Fabspeed has a cap that comes with their intake hose kit.
http://www.fabspeed.com/996-carrera-...r-upgrade-kit/
It will fit from inside into the hole and screws into the existing holes where the renoator is fixed.
I removed the complete resonator, then Dremel-tooled the top of the old resonator to mimic the Fabspeed neck and bonded the neck to top of airbox cover. Hasn't budged after thousands of miles.
Okay ... after some googling with slight different keywords then I used before starting this thread I came across this post
https://rennlist.com/forums/996-foru...irbox-mod.html
Here a 2inch 'gripper' plug is used to cap the hole.
What is the up side or benefit from removing the guts versus just capping it?
I have the ipd comp plenum and just covered the opening with the provided cap. I’m always interested in tweaks to improve the car.
Thanks!
The resonator cancels certain frequencies in the lower rpm ranges. Capping the top cancels the effect and allows a more distinct engine "voice" and a little more growl. I removed the resonator, entirely, since I didn't see a need for the obstruction to airflow after the filter and before the butterfly valve. Isn't more airflow the primary purpose for the mod kit in the first place?
Question which might be solved by this... I did the muffler delete, it was a bit too droney, so I installed the CC inserts. It eliminated the drone, but when the car is decelerating in gear it gets this raspy sound(almost ricer like). Would this resonator removal get rid of this sound ?
Astro,
Are you referring to exhaust overrun burble noise? So you gutted the muffler or removed it? CC inserts? Any of these exhaust flow variables change flow rates, hence engine frequencies and noises. Exhaust noises are what you’re talking here. Resonator is intake side.
My car has a WRX-like rasp when decelerating as well, and it�s quite loud. It got loud after I did the Fister hack. It�s loudest when the ECU cuts fuel during decel, and when cold. I don�t really care for that sound, but it�s not a big deal. I figure I could always replace the mufflers at some point.
"Are you referring to exhaust overrun burble noise? So you gutted the muffler or removed it? CC inserts? Any of these exhaust flow variables change flow rates, hence engine frequencies and noises. Exhaust noises are what you�re talking here. Resonator is intake side."
Yes, I removed the mufflers and just have the bypass pipes. Due to drone I installed Car Chemistry inserts which got rid of the drone, but must have changed the exhaust flow rates a little and I'm getting some of the sounds as described in the this other response.
"My car has a WRX-like rasp when decelerating as well, and it�s quite loud. It got loud after I did the Fister hack. It�s loudest when the ECU cuts fuel during decel, and when cold. I don�t really care for that sound, but it�s not a big deal. I figure I could always replace the mufflers at some point."
So when I started looking for threads which might address this issue I came upon the resonator one...
If your car is running rich, or if you're running sport cats or catless, the backfiring will be much more pronounced. My C4 with sport cats and Tubi mufflers made fantastic noises between gears.
Unfortunately when I took them off I wrecked the brackets and mounting plates, so this is a costly repair and not really an option I want/need to pusue. I love the throatier sound and the deceleration burbles, etc... got rid of the drone, so it's just this minor annoyance rasp sound when letting off the gas(not a burble).
