My Jag is an 06 XKR Victory Edition. I installed a Mina exhaust (and pulley and air intake). The exhaust runs from the center silencer back. It has a nice sound, but still fairly quiet and reserved so I had a Magna-Flow crossover ($85) installed for a charge of $85.

I like the new sound - still quiet while cruising, but more pronounced around town and accelerating. Sounds more towards a refined V8 or V12 than a loud boy toy.

Question – is the “screaming” from the supercharger normal when under full acceleration?

Here is the vido of the sound: Start up, fast accelerate away, accelerating drive by and then a clip from my "echo chamber" in the freeway underpass. Two sets - first with just the Mina, then with the crossover.

http://www.youtube.com/watch?v=RsyzrxNWifE

 

You should have a whine but not the scream. Sounds like the belt is slipping to me? I could be wrong I'm sure some one else will chime in.The exhaust sounds perfect though Paul

 

I would also guess you are getting belt slippage on your new pulley under heavy boost. Try a new supercharger belt. I think there is also a belt and pulley TSB upgrade. If someone knows if the improved one was already fitted on a 2006 they can chime in.

 

That screaming is belt slippage,if the supercharger pulley is made from aluminium they heat up with friction and make the belts slip and lose grip.

I think the newer supercharger belts and tensioner are ribbed on both sides.

 

Three things to consider. First, you have installed the Mina pulley upgrade so you are turning at a higher RPM. Next, and this has already been noted, it could be belt slip. Third, you may want to check the level of your SC oil and change it out while you are at it. I changed the oil in my 2005 XKR, SC recently and observed that it does run quieter at low and high RPM.

Nice exhaust sound but you are right the SC does seem to squeal too loud.

 

As already mentioned SC oil could be low,could even be the snout bearings are packing in.I changed my snout bearings to uprated ones as you will be spinning the SC considerably faster than normally.

I can advise further if it turns out to be the bearings.

 

FWIW, my R never screamed, just a whine at higher rpm under load.
Exhaust sounds good. Thanks for the trouble to record it.

 

exhaust does sound dayum good!

 

I want that exhaust! Or at least the sound of it.

 

I'm also a fan of that exhaust...very nice indeed! Great clips for others to judge how a similar modification will actually sound. Thanks for taking the time to document it and share.

 

I also have a 2006 XKR Victory Edition and the improved belt and pulley assembly was not fitted from factory. This TSB was performed on my car to eliminate cold start belt squeal. My SC is substantially quieter now to the point where I have to listen to hear it.

If I fitted your exhaust, that's probably all I would hear on my car! Hmmm, tempting....

 

Exhaust sounds great, screech sounds terrible. I'd bet it's belt slippage, however, I'd check the pulley as well, it may not be lubed properly or have other issues.

 

Auto parts sell stuff that you spray on belts to make them stickier. It might not be a permanent fix, but it will at least let you know for sure if it's a slipping belt.

By the way, I think the squealing supercharger is kinda cool. It's as if it is screaming "GTF outa my way!!!"

 

Hi James. Love the sound you have achieved. I have the mina exhaust with straight pipes and get a popping sound which I hate. I would love to try the X pipe and was wondering where you had it installed. I am thinking we are neighbors as I see your NH tag and that looks like rt 142 in Franconia? I'm in Whitefield and spotted a similar car to yours leaving the Lions club car show. Not many xk8's up here so I'm thinking that was again you. I would love to find a local mechanic up on these cars and would appreciate any help. walt

 

Provided you aren't getting to tricky with your system, most muffler shops should be able to install it. I had a hot rod shop down in NC put that plus two magnaflow cans on my XK8. Custom Jaguar XK8 exhaust - YouTube

With that car gone not sure what's next for the XKR I have now but finding a pipe bender shouldn't be hard, especially in NH where winter eats up exhaust systems like recycled beer cans. Keep in mind that part isn't expensive, it's the labor you're paying for: Magnaflow X Pipe

 

In addition to the other comments regarding belt slip, replacing the tensioner at this age is a good idea. Some ways to stop the belt slip are to replace the belt, replace the tensioner, replace the small pulley, check the supercharger drag to be sure that isn't the problem..

 

I also have the same screeching on my xkr.I replaced the belt with the alligator
belt which made no difference wonder if you or anyone has been able to fix or
know what the problem is and how to fix it ?Hope you found the answer and can let me know. PS looked all over YouTube
it seems you and I have the only ones that make this screeching sound.

 

Hi what was the outcome of the squealing belt and how is the car running today? Also what is the hp gains of the parts?

Would all these mods make our (I like saying this now! Lol) cars make at least 450hp with xpipes, exhaust, intake and pulley? Does any one have a realistic breakdown?

 

Nice exhaust note! I am definitely doing that Magnaflow x-pipe very soon, at least to start. It's got a very nice gurgle without being overtly obnoxious. I wouldn't even mind a little bit of modest popping.


Definitely sounds like belt squeal- mine whines but doesn't sound like a shrieking witch! Ack!

 

My '04 Portfolio squeals when I stomp it too. The spray-on pig snot seems to lubricate the belt so that it slips easier. I wonder if a new tensioner would help.