XJ XJ8 / XJR ( X308 ) 1997 - 2003

X308 XJR without rear anti sway bar?

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Old 03-06-2016, 05:12 PM
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Question X308 XJR without rear anti sway bar?

A current eBay auction for a 2003 XJR shows it with no rear sway bar. Was the rear sway bar not always fitted to the X308 XJR? Or perhaps someone has taken it off of this car?

The rear anti sway bar was standard on the X300 XJR, so was just curious of that were different for the X308.

Jaguar XJR XJR | eBay


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Old 03-06-2016, 06:23 PM
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My '03 XJR has it. It does have the Milan package, but I thought all XJR's had it.

-Mike

ETA: From the pictures it looks really clean. Doesn't look like it ever had a rear bar.
 

Last edited by TXE36; 03-06-2016 at 06:35 PM.
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Old 03-06-2016, 06:44 PM
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It looks like the sway bar and links have been removed by someone.

The first pic is from the ad, the second is from my 2001 XJR when I changed my links and bushings.
Vector
 
Attached Thumbnails X308 XJR without rear anti sway bar?-z6whnz6yowfhy5v6d7o-rbnix3udj4l5gskuvpaaoghfmqax.jpg   X308 XJR without rear anti sway bar?-20141104_200023.jpg  
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Old 03-06-2016, 06:58 PM
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I guess someone really liked understeer.
 
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Old 03-06-2016, 08:35 PM
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Originally Posted by al_roethlisberger
A current eBay auction for a 2003 XJR shows it with no rear sway bar. Was the rear sway bar not always fitted to the X308 XJR? Or perhaps someone has taken it off of this car?

The rear anti sway bar was standard on the X300 XJR, so was just curious of that were different for the X308.

Jaguar XJR XJR | eBay


.
My '03 XJR has it. Previous owner must have taken it off. Don't know why he would take it off, but you don't need it unless you plan to throw the kitty hard around corners....
 
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Old 03-07-2016, 09:54 AM
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It probably never had a rear anti roll bar, since there's no mounting plate for the roll bar bushings (see attached pictures).
There are two versions of the wishbone tie assembly and I doubt that the preowner changed it to the "no anti roll bar"-version when removing the anti roll bar. So it's more likely that it didn't ever had an anti roll bar.
Even though I don't know of any XJR, which had no anti roll bar...I thought they'd been fitted as standard for every supercharged and XJ Sport version.
Maybe the car got a whole new rear suspension or differential mounting at some point?

Regards, Alexander
 
Attached Thumbnails X308 XJR without rear anti sway bar?-page154_1.jpg   X308 XJR without rear anti sway bar?-p1110624.jpg  
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Old 03-07-2016, 02:17 PM
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Only a VDP has no rear bar.
Vector
 
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Old 03-07-2016, 06:48 PM
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Originally Posted by xjr2014_de
It probably never had a rear anti roll bar, since there's no mounting plate for the roll bar bushings (see attached pictures).
There are two versions of the wishbone tie assembly and I doubt that the preowner changed it to the "no anti roll bar"-version when removing the anti roll bar. So it's more likely that it didn't ever had an anti roll bar.
Even though I don't know of any XJR, which had no anti roll bar...I thought they'd been fitted as standard for every supercharged and XJ Sport version.
Maybe the car got a whole new rear suspension or differential mounting at some point?

Regards, Alexander
Totally agree, no one would remove the wishbone assembly - this car, or this rear end never had one. Maybe the wrong rear assembly came down the line and into the car it went
 
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Old 03-07-2016, 06:53 PM
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No matter, the car is nearly perfect. . .
 
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Old 03-07-2016, 08:28 PM
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Nice, the ad details state they replaced ample suspension components.
 
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Old 03-07-2016, 09:40 PM
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Thanks for the quick replies, I concur and noticed the wishbone mounting tabs and lack of the correct central mounting plate, so it had me scratching my head too.

I can't imagine anyone removing the anti sway bar, and even if so also changing out the differential mounting plate, so it's an odd one. An interesting mystery.

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Old 03-08-2016, 12:58 PM
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The JDHT website lists the rear A/R bar as "Supercharged" for USA models, which would imply that the A/R bar was fitted as standard to the S/C models. It is quite possible that the wishbone tie has been replaced with a non A/R bar version (my old X300 failed an MOT once due to failed wishbone tie bushes and had to be replaced so it's not beyond the bounds of possibility). I don't know if the US has an equivalent to the Uk MOT roadworthiness certificate which has to be done anually but its quite possible a PO has had fitted a non A/R bar unit due to cost/availability most probably....
 
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Old 03-08-2016, 03:34 PM
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It did not come off the assembly line like that.

Lack of a rear sway bar may not make a lot of difference, but the XJR suspension was engineered to have it.

Kind of like having mismatched tires front and rear only worse.

Body roll in the back and not so much in the front in turns?

Wonder what else they did to the car?
Vector
 
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Old 03-10-2016, 04:15 PM
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Do you guys see the difference on the rear of what Vector posted? If you don't have the sway bar, you have the truss carrier like I have on my VDP. It literally is a truss like on a commercial building. This mounts to the body on the wide parts of it and down to the differential where it is attached. Thus replacing the old style sway bar.
I used yellow on the second pic to see it easier.





 

Last edited by Highhorse; 03-10-2016 at 04:33 PM.
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Old 03-10-2016, 05:39 PM
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I noticed the same although I don't see how the truss bar arrangement can replace and/or perform the same function as a rear anti-roll bar. Am I missing something?


Cheers
DD
 
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Old 03-10-2016, 05:50 PM
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Someone will probably need to clarify this, but I believe they use the truss system on the CATS system? The stiffening of the shocks when in sport mode compensates for the sway bar I believe?
I've taken 40 mph curves doing anywhere between 70-90 and she sticks like on rails with no roll and that's how I lost a Lexus 460 one night and then I came off the ramp onto the adjoining highway and powered off it doing 155 .....and I coasted the next 5 miles and never saw him again. Mind you I was running Michelin Pilot Sport 225's then. They are sticky like a spider web, but I only got 9500 miles out of them. I'm using 255 Goodyear Eagles now (with a 55k warranty), I don't trust them as much with the larger sidewall and harder compound. But they are still descent.
 

Last edited by Highhorse; 03-10-2016 at 06:04 PM.
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Old 03-10-2016, 05:54 PM
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Originally Posted by Highhorse
Someone will probably need to clarify this, but I believe they use the truss system on the CATS system? The stiffening of the shocks when in sport mode compensates for the sway bar I believe?

Ahhh. Seems plausible.

Cheers
DD
 
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Old 03-10-2016, 06:01 PM
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Originally Posted by Highhorse
Someone will probably need to clarify this, but I believe they use the truss system on the CATS system? The stiffening of the shocks when in sport mode compensates for the sway bar I believe?
I've taken 40 mph curves doing anywhere between 70-90 and she sticks like on rails with no roll and that's how I lost a Lexus 460 one night and then I came off the ramp onto the adjoining highway and powered off it doing 155 .....and I coasted the next 5 miles and never saw him again.
You left the ramp doing 155mph? Impressive. Perhaps you can tell me where the button is for the hitherto-unsuspected warp drive, on my XJR.
 
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Old 03-10-2016, 06:12 PM
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Originally Posted by Mark SF
You left the ramp doing 155mph? Impressive. Perhaps you can tell me where the button is for the hitherto-unsuspected warp drive, on my XJR.
....hahaha, I was almost maxed down to the speed control rubber mount under the pedal. It was awhile ago, but I remember looking down at the speedo after checking my mirror for that guy and I was like "DANG!" (insert other word).

BTW, the car for sale does have CATS, you can see the caps and leads on the front shock towers.

 

Last edited by Highhorse; 03-10-2016 at 06:29 PM.
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Old 03-11-2016, 07:04 AM
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Originally Posted by Highhorse
Someone will probably need to clarify this, but I believe they use the truss system on the CATS system? The stiffening of the shocks when in sport mode compensates for the sway bar I believe?
I've taken 40 mph curves doing anywhere between 70-90 and she sticks like on rails with no roll and that's how I lost a Lexus 460 one night and then I came off the ramp onto the adjoining highway and powered off it doing 155 .....and I coasted the next 5 miles and never saw him again. Mind you I was running Michelin Pilot Sport 225's then. They are sticky like a spider web, but I only got 9500 miles out of them. I'm using 255 Goodyear Eagles now (with a 55k warranty), I don't trust them as much with the larger sidewall and harder compound. But they are still descent.
Every version of the 308 uses the same truss. It has noting to do with the anti-roll bar. The CATS electronic shocks have a soft and a hard setting and all 4 shocks adjust together. They do not provide any anti-roll control.
 


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