Thank you sir, I hear it all the time in mine, but after 5 years worth of daily development on my Twin Screw Kit for the Porsche 928 a few years ago, I hear that TS whine in my sleep..LOL

Or maybe my ear is tuned to listen for it, and I do have crazy hearing!

Happy Monday,

Dave

 

please tell me you have found an answer to that. I have a 2015 F type R and installing a snowperformance stage 2E meth injection system on it. im planning to tap the boost reference sensor of the system in the symposer. Not sure if that will work. U’ve had any luck?

 

Uh, no?
A supercharger puts boost into the intake manifold, not the air intake. Any physical boost gauge would need to tap directly into the intake runners or plenum areas.
You DO know that the OBD2 has boost values, right?

 

but the symposer on the f type is behind the engine and not by the intake in front of it and velocityap told me that there is boosted air there (they called it symphonizer). I am just not sure how accurate the boost reading will be. And yes im aware that obd 2 has boost values, but snowperformance boost reference uses a pnuematic hose that u connect to any charged air source.

 

Okay, but that hose MUST be attached to a source with direct connection to the intake manifold. The compressed air goes directly FROM the supercharger into the Intake. That is the ONLY way it would work. If a supercharger caused any boost into the intake tubes, zero air of any sort would enter the engine.

 

I think you are mistaking the symposer / resonator with center intake duct. From the attached image, the symposer actually comes after the intake manifold and not before it like the intake tube. Am i missing anything?

 

Using my limited knowledge, the symposer is attached to and gets it's input from the low pressure/vacuum side of the blower. If I'm wrong, then I'm wrong. I wouldn't see why it'd be there on the HIGH pressure side because the "SUCK" sound wouldn't be there because No Suck to make sound. It'd be pressure.
On old Chevy's, people would flop their carb's air cleaner lids upside-down so all the air would go into the filter from the entire circumference instead of just the snorkel. That gave the Suck sound. Blowers don't make suck on the pressure side.

 

yes. I agree. It’s a very specific design question that we’re trying to answer. Anyway, i have sent an email to the engineering department in eaton (JLR SC providors) asking about the feasibility of using the SC outlet resonator as a boost reference. I have checked and they own the patent of this specific resonator design. We’ll see what they’ll say.

 

I’m actually having the symposer tube replaced on my 2010 tomorrow. The cracked tube threw P0171 & P0174 codes (banks 1 & 2 too lean).

 

Too Lean means a vacuum leak. No vacuum where boost would be measured.

 

Glad this old thread was revived. In my quest to make my 2010 XK (N/A) even quieter, this came at a good time. I just removed the "sound-tube" hose from the air intake "Tee" and plugged the plastic spigot where the hose attaches, and put the hose back on. I didn't want to remove the tube, as a future owner might want to re-activate the option.
A lot simpler system on the N/A/ engines...
When my head cold goes away I'm anxious to see how much noise reduction I get...

 

Here is a video of company the sells a blank off kit . The presenter is of the opinion that there is no noticeable change in sound with it deleted. I suspect people hear an improvement because they want to hear an improvement. Same as in high end audio, tell someone to focus on a certain aspect of sound and psychologically the will notice the difference. That said, if I were doing a service on the supercharger, I would remove it for fewer points of failure in a motor.
Anyhoo...

 

With my 2016 with manual transmission I can easily replicate conditions where I hear it activate and it's like throwing a switch for "disembodied drone." At least I could replicate it before first defeating it, then deleting it.

Some followed my defeat instructions and reported no noticeable difference.

https://www.jaguarforums.com/forum/f...defeat-171035/

Possible causes of that include a faulty symposer to begin with or that the automatic transmission masks the activation. Since it uses a solenoid, perhaps the system works in concert (pun intended) with transmission operation in a way that's not possible with the 6MT. In any case, the difference is quite noticeable on my car, and once defeated I've never looked back. Defeating takes two minutes, but removal was a royal pain. I've hear that on a supercharged V8 it's even worse due to reduced working room.

 

I recently removed the symposer in a 2010 xkr with supercharger in place

I used a blanking plate from “quality superchargers” on eBay

the old parts were brittle and some plastic cracked so wouldn’t recommend this job if you are trying to remove just for the sake of it. I permanently deleted

With the supercharger on, the trick is to unbolt / loosen the rear coolant crossover pipe like half an inch (you lose some coolant)

And then I just used pliers/snippets to cut everything - including hoses

no noticeable difference in sound/drone

 

Thanks for the great pics! I will definitely keep this in mind if I need to remove mine. Does it help at removing it for a suppercharger oil change?

 

For the V6, definitely. For the V8 I don't know since I don't have one. Probably? Maybe? Hopefully someone with a V8 can chime in.

 

I must be missing something. I don't understand the excitement about removing this thing... unless of course its broken and you don't want to replace it.

 

For my particular configuration it was very noticeable when it would switch on, and when it did I'd get a sudden drone in the cabin that seemed not have a clear source. Engine noise should come from the front, exhaust noises from the rear. Now I get that. I suppose it's possible that for those that notice no difference after doing the two-minute defeat process theirs were not functioning anyway. It's also possible that with the 6MT it just is set up differently and is more noticeable. I'd notice it under modest acceleration in 3rd or 4th, and at a particular RPM the drone just appears.

 

I was chasing a drone as well.

 

I think so as it clears up the area and can see the fill and drain screw.