SOUL | Drone Reduction Sound Symposer Delete
08-31-2021, 12:15 PM
#211
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+1
It's gone and completely forgotten, don't miss it a bit!
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Alpha Ice (09-01-2021)
08-31-2021, 05:19 PM
#212
Yeah, that seems like the likely path !
08-31-2021, 09:01 PM
#213
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this hole does, in my mind correct the install of CG controller. Only in that you may not have to run wires under the engine cover seal. Just not a fan of that and why I went with the soul unit. Though ultimately I’m still not using that either, just going with softronic tune and will gain full control via the factory PSE button!
09-01-2021, 11:00 AM
#214
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Doesn't the hole for the Sound Symposer go from the engine compartment into the passenger compartment, whereas the wires from the Cargraphic Controller go from the engine compartment into the rear trunk area? I don't have the Cargraphic controller yet so I'm just asking.
If at the same time you are pulling out the Sound Symposer you could feed the CG controller wires through the firewall hole and have the controller box in the passenger compartment behind the seats. With this method you would need to fashion a seal to close the symposer hole around the wires. I mounted mine in the rear trunk, no issues what so ever.
Just to note this is the 2-mode controller not the 3-mode that requires external power.
Last edited by Westcoast; 09-01-2021 at 11:54 AM.
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nothingman (09-01-2021)
09-01-2021, 12:11 PM
#215
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HooosierDaddy (09-01-2021)
09-01-2021, 12:36 PM
#216
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09-01-2021, 12:39 PM
#217
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The controller antenna is just behind my seat, still in the engine compartment. So very short distance with the remote, it works fine.
Last edited by Spyderblack; 09-01-2021 at 01:04 PM.
09-01-2021, 10:38 PM
#218
EDIT: just realized you are in France, guess the source wouldn't help us in NA much
Last edited by HooosierDaddy; 09-01-2021 at 10:39 PM.
09-04-2021, 07:11 PM
#219
Well, although not what I would call dramatic the reduction in drone is noticeable... I removed the entire symposer tube and vacuum valve assemblies, plugging both the firewall opening and the chamber at the intake with 1" expansion plugs, my config is with Akra OAP's and JCR silenced Rear sections.
What I note is that any sound that was coming from the symposer is of course now gone, but sound coming into the cabin through chassis resonance remains. I feel that the effort and cost make it a worthwhile exercise but don't expect it to eliminate drone, at least in my opinion if your exhaust configuration drones then it will continue to do so but the symposer will not amplify its effect in the cabin. During top-up drives the cabin drone was better and you could easily tell it was reduced, but lug the engine in a high gear between 2000-2600 RPM and it will drone. What was easier to determine was the frequency change between valves open (higher) and valves closed (lower), but I would say the volume was similar in either setting.
Comparatively a buddy with a GT4 and completely OEM exhaust system felt it was a game changer, what was before tiring and unbearable while cruising was nearly cured by this mod, he said he could have a normal conversation in the car where as before it was not possible.
So at this point your results may vary depending on GT4 versus Spyder (top up/down) and if you exhaust is stock or modified.
What I note is that any sound that was coming from the symposer is of course now gone, but sound coming into the cabin through chassis resonance remains. I feel that the effort and cost make it a worthwhile exercise but don't expect it to eliminate drone, at least in my opinion if your exhaust configuration drones then it will continue to do so but the symposer will not amplify its effect in the cabin. During top-up drives the cabin drone was better and you could easily tell it was reduced, but lug the engine in a high gear between 2000-2600 RPM and it will drone. What was easier to determine was the frequency change between valves open (higher) and valves closed (lower), but I would say the volume was similar in either setting.
Comparatively a buddy with a GT4 and completely OEM exhaust system felt it was a game changer, what was before tiring and unbearable while cruising was nearly cured by this mod, he said he could have a normal conversation in the car where as before it was not possible.
So at this point your results may vary depending on GT4 versus Spyder (top up/down) and if you exhaust is stock or modified.
Worth noting that the high RPM scenario of Akra OAP and JCR is really really good. But the low rpm drone makes reasonable city driving a challenge (to me).
09-04-2021, 08:00 PM
#220
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I have tried the setup of Akra OAP with JCR silenced race pipe and the drone was really too much. Found myself modulating the throttle to avoid it rather than drive the car as I please. I went back to stock OAP with the PF's with the JCR silenced race pipe and it massively improved the unbearable drone. I am yet to delete the symposer, but reading your comment I thought to share the experience with you to give it a try if you haven't yet.
Worth noting that the high RPM scenario of Akra OAP and JCR is really really good. But the low rpm drone makes reasonable city driving a challenge (to me).
Worth noting that the high RPM scenario of Akra OAP and JCR is really really good. But the low rpm drone makes reasonable city driving a challenge (to me).
09-04-2021, 08:32 PM
#221
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I have tried the setup of Akra OAP with JCR silenced race pipe and the drone was really too much. Found myself modulating the throttle to avoid it rather than drive the car as I please. I went back to stock OAP with the PF's with the JCR silenced race pipe and it massively improved the unbearable drone. I am yet to delete the symposer, but reading your comment I thought to share the experience with you to give it a try if you haven't yet.
Worth noting that the high RPM scenario of Akra OAP and JCR is really really good. But the low rpm drone makes reasonable city driving a challenge (to me).
Worth noting that the high RPM scenario of Akra OAP and JCR is really really good. But the low rpm drone makes reasonable city driving a challenge (to me).
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UncleDude (09-05-2021)
09-04-2021, 08:47 PM
#222
Given the above posts, and since I haven’t taken the symposer out yet, I’m wondering if anyone with a JCR exhaust (that’s it) has had significant positive results removing it ?
jCR exhausts have a beefy mounting plate for the assembly, just wondering if that makes the low RPM drone / resonance harder to reduce…
hoping to do this in the next week….
jCR exhausts have a beefy mounting plate for the assembly, just wondering if that makes the low RPM drone / resonance harder to reduce…
hoping to do this in the next week….
09-05-2021, 10:07 PM
#223
Given the above posts, and since I haven’t taken the symposer out yet, I’m wondering if anyone with a JCR exhaust (that’s it) has had significant positive results removing it ?
jCR exhausts have a beefy mounting plate for the assembly, just wondering if that makes the low RPM drone / resonance harder to reduce…
hoping to do this in the next week….
jCR exhausts have a beefy mounting plate for the assembly, just wondering if that makes the low RPM drone / resonance harder to reduce…
hoping to do this in the next week….
Mine has the resonance/drone at 2000 rpm without that relatively thick plate installed.
09-05-2021, 11:15 PM
#224
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Now that you mention that plate (a seperate plate with the jcr logo on it iirc), the installer couldn't find out figure out where that plate would fit, so left it aside and installed it without. Anyone knows where that plate should fit?
Mine has the resonance/drone at 2000 rpm without that relatively thick plate installed.
Mine has the resonance/drone at 2000 rpm without that relatively thick plate installed.
, IMHO it is a crucial part of the overall mount, otherwise the rear section is floating and only attached to the OAP's, not a good plan as it is essentially able to pull up/down on all of the welds and joints all of the way back to the headers mounted to the engine.Does this picture help?, I have more...
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mprog (09-05-2021)
09-05-2021, 11:22 PM
#225
Email Jonny because I seem to recall there were 2 versions of the Mount, meant to track different versions of the car’s hardware.