if i install the delete kit will my engine be louder ??

 

No, it will just remove the droning sound that erupts nonlinearly in the cabin.

I stuffed my symposer pipe with foam from the discarded engine cover. However it didn't make enough of a difference for me so I'm going to replace the foam with a solid plug.

 

Exactly, the engine will sound the same, but you'll get rid of some artificial droning in the cabin. Makes a marked difference in the V6 cars where you can hear the exhaust in the cabin much better after the symposer mod. I've seen a bunch of V8 owners claiming that the mod did zero difference in their cars, so could be that the difference is less noticeable in the V8 cars because there's more in cabin engine noise.

I stuffed mine with a plug of fireproof insulation material wrapped in aluminum foil which worked great. Much easier than buying a delete kit.

 

I used a piece of tightly rolled ensolite to disable mine. The engine won't sound louder but you'll be able to hear it better. I've come to think the off/on transition of the symposer system is more noticeable with the 6MT since some of the 8AT folks haven't noticed much difference after the symposer defeat mod.

The ensolite plug was effective enough that I noticed no difference from it and the full delete; however, the full delete makes a supercharger oil change almost trivially simple (V6S) and opens up space behind the engine.

 

Someone who is more certain about this can perhaps confirm, but I believe the symposer plumbing is a potential vacuum leak source. Correct? If so, a complete delete removes a potential problem that could be PITA.

 

I haven't heard of any failures in the system causing noticeable vacuum leaks but for the record, complete removal is a complete PITA.

 

How much of a project is it to install the VAP blanking plate or OEM Rover adapter to install on a V8? I am considering this as instead of removing it.

 

Before anyone gets too carried away, I was gung ho on this modification, got the kit (metal thick plate), put the blanking plate on my car .....

You know what, I liked my car more with the symposer. V6. What some call drone I call "engine"....it sounds like a Lexus now and all you hear is the exhaust..no engine.


Sure it is a bit more refined, but those JLR engineers perhaps knew what they were doing. I am re-connecting the symposer as soon as the engine cools off.


I am really surprised by this - had really thought it was the way to go, more purist, etc. Well, I am into extra noise I guess. I re-attached the symposer.

 

The symposer is made up of a two tubes with a diaphragm chamber in the middle and a vacuum activate valve. the valve is vacuum actuated to allow sound to pass through to the chamber. By removing the symposer you potentially do two things. the third is for sure
1. You plug the vacuum line and remove a potential leak
2. you remove a plastic tube connected straight to the super charger which is a potential for boost leak and a CEL and who knows what else
3. Changes sound environment within the cabin

I have tried making one similar to a supercharger whine mod to be always on and it sounded horrible.
There is definitely some sound shaping within the diaphragm chamber.

Mine is gone and replaced with a 3d printed block off plate, but my exhaust and SC are so loud I don't think I could hear it anyway
VAP makes a block off plate out of aluminum

 

You can watch the VAP video on their web site or read over the dozens of threads on this subject right here and you will be good to go. In a nutshell, EASY.

 

I have yet to read anything on here or elsewhere about the NGPTSQ (successor to the symposer) such as how it works, whether it's adjustable as rumored. I know it's listed on the build sheet for my 2022 P450, but I can't tell if it adds sound thru the speakers as advertised.
Anyone have any recent information on the Next Generation Power Train Sound Quality feature?

 

Interesting, appreciate you taking the time to post that conclusion.

 

It's really easy to defeat the symposer in an easily reversible way, and it's about two minutes to do or undo. Given your observations, I'd encourage anyone considering the kit to try that first. Search for the "Symposer defeat" thread.

My current thinking is that the off/on point is more obnoxiously obvious with the manual transmission (steady throttle, slowly increasing RPM, it just comes on suddenly) but I don't have another car to test that theory. I don't really have the inclination either. I was happy with the defeat, and am happier now with the delete, but it was a royal pain to cleanly remove the symposer components.

 

I still cannot elicit a comment about the successor to the symposer, the NGPTSQ. Is there no one who knows anything about this technology? My dealership certainly doesn't.

 

Additional info from when I did mine 👍

DC

https://www.jaguarforums.com/forum/f...emoval-240551/

 

You can stop the noise effect simply by unplugging the solenoid that switches the noise on.

 

For the traditional symposer I think that'd work but my dim recollection is that it generates some kind of (harmless) error message. Blocking the hose as I describe does not and is easier to reach than that plug. When I did the full delete, i.e. removing the components and installing the blanking plate, I left the solenoid in place and plugged in, with a cap over the unused port. Complete removal of the main symposer unit does clean up the back of the engine compartment and aid serviceability.

Of the electronic successor, NGPTSQ, I know nothing. I'm sure there's no solenoid, vacuum lines, chambers, modulators, or encabulators (either turbo or retro). Maybe there is a red wire to cut, or maybe blue to disarm it, but I don't have a wiring diagram and lack the same motivation to investigate as I did for the accursed symposer. If I had a later car I *would* be motivated, thinking back on the derision I and others heaped on BMW for their system.

 

Forget half measures
buy the Vap Symposer delete kit
its quality and great fit and the bonus of a boost take off

 

Using the VAP "delete" kit but leaving all the parts in place is still a defeat, not a delete. Removing all the parts is the real delete, and it's no easy to do cleanly. The simplest defeat versus full delete is the difference between 2-3 minutes and half a day.

My suggestion was to try the simple delete and see if you like it before buying any parts and removing more than one bolt.