Intake tube resonator.
#1
Intake tube resonator.
The stock intake tube leading to the throttle body has a resonator chamber. Basically a hole routed to a square box. Now I am not sure if it is a pressurized chamber that regulates airflow, or just for sound deadening. I was looking on japanparts and noticed this overpriced cap. The brand is Revolution, which is a Japanese builder of plenty quick track RX-8's, RX-7's, and NSX's if that says anything.
http://www.japanparts.com/db/parts_d...&SEARCH_page=2
Has anyone removed the resonator and had ill effects?
http://www.japanparts.com/db/parts_d...&SEARCH_page=2
Has anyone removed the resonator and had ill effects?
Last edited by SayNoToPistons; 06-04-2012 at 02:03 AM.
#2
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We had a discussion about this a wihle back on one thread. Basically if you consider that the resonance chamber does nothing but add slightly more volume to the intake, there really is nothing to be gained from its removal except for more noise.
Here is the actual site for the product:
http://revo-tune.jp/catalogue/detail.php?id=255
Here is the actual site for the product:
http://revo-tune.jp/catalogue/detail.php?id=255
#6
We had a discussion about this a wihle back on one thread. Basically if you consider that the resonance chamber does nothing but add slightly more volume to the intake, there really is nothing to be gained from its removal except for more noise.
Here is the actual site for the product:
http://revo-tune.jp/catalogue/detail.php?id=255
Here is the actual site for the product:
http://revo-tune.jp/catalogue/detail.php?id=255
#11
Did a little more research on the resonator. I'll just leave this here.
http://www.brighthub.com/engineering...les/84316.aspx
And for us engineers out there that have taken high level physics and fluid/thermodynamics:
http://www.dinamoto.it/dinamoto/8_on...suonatore.html
http://www.brighthub.com/engineering...les/84316.aspx
And for us engineers out there that have taken high level physics and fluid/thermodynamics:
http://www.dinamoto.it/dinamoto/8_on...suonatore.html
Last edited by SayNoToPistons; 06-04-2012 at 07:23 AM.
#12
Out of NYC
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that piece is known to be a resonator. well team already post the page out.
if u want it to look "pretty", Odula Japan sells a piece to replace the stock tube + box thing. I saw it before when I was in Hong Kong and it looks pretty nice.
if u want nothing fancy, just do whatever u want or just do what team suggested.
if u want it to look "pretty", Odula Japan sells a piece to replace the stock tube + box thing. I saw it before when I was in Hong Kong and it looks pretty nice.
if u want nothing fancy, just do whatever u want or just do what team suggested.
#13
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Okay, I would hit up the local hardware stores first. Ideally, the cap would be:
-round and smooth sealing surface for the clamp
-proper size
-minimal to no internal volume
-long enough to get clamped down
I surmise that any amount of volume added at that specific area, would decrease the sound output. Maybe I am wrong though.
I would go to Dixieland or a plumbing store first, as their PVC selection is better:
-Home Depot option-
If all you have is Home Depot, you might have to settle for a 3/4'' elbow with threaded cap. Their cap would work if you inverted it and inserted, but as you can see it was ridged and might not have provided the best seal:
The best I could find at Home Depot was the 3/4'' elbow, despite having a somewhat large internal volume:
Note the angle of the dangle to mate with the curved rubber inlet:
Make sure to get the cap that is solid, not open at the end:
Rigged up:
-Dixieland/Other option-
Various assortment of caps versus Home Depot rig. Some caps were a bit too short, some had a ridge in the sealing surface to contend with:
Obviously, the best option was the Lasco 1'' cap. It had a stop to prevent it from going inside the intake, had a perfectly round sealing surface with no bumps, and was long enough to get clamped:
It did have a small bit of internal volume though as it was hollow:
Close size match:
Installed:
Internal view:
Comparisions with VFAD cap mod:
I think capping the VFAD helped to improve noise under heavy throttle. However, I believe the resonance chamber cap helped to improve noise under light throttle as well. As they are both cheap and easy to do, I would perform both for optimal sound increase and best rotary signature rrrrrrrrrrrrsss. Recently I have been obsessed with making the rx8 louder, these intake mods proved vital in addition to the muffler delete.
-metal cap options-
I tried the 3/4'' copper cap, but it was soo small. And the 1'' copper cap was too large. No go.
-filling options-
I considered filling the cap with some type of high temperature substance, but was concerned about heat degradation of the filler over time and possible particulate contamination as it broke down.
-sound quality-
This is subjective and personal preference. Obviously, Mazda decided that the normal intake sound was too awesome for the 4-seater sedan, baby and kid in the backseat customer. I would say it is not too loud, and the sound is not rough to the ears at all. It would be a good stock sound, if this was marketed at the 2-seater coupe market.
-round and smooth sealing surface for the clamp
-proper size
-minimal to no internal volume
-long enough to get clamped down
I surmise that any amount of volume added at that specific area, would decrease the sound output. Maybe I am wrong though.
I would go to Dixieland or a plumbing store first, as their PVC selection is better:
-Home Depot option-
If all you have is Home Depot, you might have to settle for a 3/4'' elbow with threaded cap. Their cap would work if you inverted it and inserted, but as you can see it was ridged and might not have provided the best seal:
The best I could find at Home Depot was the 3/4'' elbow, despite having a somewhat large internal volume:
Note the angle of the dangle to mate with the curved rubber inlet:
Make sure to get the cap that is solid, not open at the end:
Rigged up:
-Dixieland/Other option-
Various assortment of caps versus Home Depot rig. Some caps were a bit too short, some had a ridge in the sealing surface to contend with:
Obviously, the best option was the Lasco 1'' cap. It had a stop to prevent it from going inside the intake, had a perfectly round sealing surface with no bumps, and was long enough to get clamped:
It did have a small bit of internal volume though as it was hollow:
Close size match:
Installed:
Internal view:
Comparisions with VFAD cap mod:
I think capping the VFAD helped to improve noise under heavy throttle. However, I believe the resonance chamber cap helped to improve noise under light throttle as well. As they are both cheap and easy to do, I would perform both for optimal sound increase and best rotary signature rrrrrrrrrrrrsss. Recently I have been obsessed with making the rx8 louder, these intake mods proved vital in addition to the muffler delete.
-metal cap options-
I tried the 3/4'' copper cap, but it was soo small. And the 1'' copper cap was too large. No go.
-filling options-
I considered filling the cap with some type of high temperature substance, but was concerned about heat degradation of the filler over time and possible particulate contamination as it broke down.
-sound quality-
This is subjective and personal preference. Obviously, Mazda decided that the normal intake sound was too awesome for the 4-seater sedan, baby and kid in the backseat customer. I would say it is not too loud, and the sound is not rough to the ears at all. It would be a good stock sound, if this was marketed at the 2-seater coupe market.
Last edited by User24; 08-25-2012 at 03:40 PM.
#15
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the only issue with doing it that way is you still have an air flow disturbance cavity
not sure why I didn't think of this previously, but take off the accordion tube, place a piece of duct tape on the inside of the accordion tube over the opening to seal it off smoothly, then position the opening vertically and fill it directly with urethane. Once cured you can remove the duct tape and tighten the clamp down on the outside to keep the urethane plug in place just like the resonator.
it is only for intake noise abatement as stated in the factory literature
not sure why I didn't think of this previously, but take off the accordion tube, place a piece of duct tape on the inside of the accordion tube over the opening to seal it off smoothly, then position the opening vertically and fill it directly with urethane. Once cured you can remove the duct tape and tighten the clamp down on the outside to keep the urethane plug in place just like the resonator.
it is only for intake noise abatement as stated in the factory literature
Last edited by TeamRX8; 09-10-2012 at 02:01 AM.
#19
Danny Rotstein
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Reviving this thread.
I was looking at purchasing this:JDM Japanese Auto Parts specialists | japanparts.com
but I wanted to read about it first so I wound up at this thread. I read the posted link on volumetric efficiency. Has anyone who has removed the resonator noticed any loss in tq? Can it honestly even be noticeable, seeing as our cars have no tq as is?
Thanks
Edit: going back and reading more thoroughly the engine it's describing is a piston engine. How would the same concept of volumetric efficiency be applied to our rotaries?
I was looking at purchasing this:JDM Japanese Auto Parts specialists | japanparts.com
but I wanted to read about it first so I wound up at this thread. I read the posted link on volumetric efficiency. Has anyone who has removed the resonator noticed any loss in tq? Can it honestly even be noticeable, seeing as our cars have no tq as is?
Thanks
Edit: going back and reading more thoroughly the engine it's describing is a piston engine. How would the same concept of volumetric efficiency be applied to our rotaries?
Last edited by Danmn858; 07-25-2013 at 01:26 AM.