XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

rear sway bars

 
  #1  
Old 04-30-2012, 10:33 PM
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Default rear sway bars

Need some pictures of rear swaybars and how they mount so i can figure out how to make my upgrades trailing arms and differential support mount. Anything would be helpfull
 
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Old 04-30-2012, 10:37 PM
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........ there arent any. at least, no one on this forum has an XJS thats old enough to have rear sways.


Mish's xjs might be old enough, but i dont think so.
 
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Old 04-30-2012, 10:55 PM
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You might already the two stud plates in the floorboard that the U-brackets bolt to. If so, you just need to weld a couple tabs to the trailing arms to accept the end links.

Here are some pics. I'll try to find others

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Not sure what you mean by "differential support mount"

Cheers
DD
 
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Old 04-30-2012, 11:09 PM
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Here's a good pic of the rear arms with the little brackets on the small end

Jaguar XJS Rear Radius Arm Assembly with Bushes (C41831*) | JustJagsUK.com


Cheers
DD
 
  #5  
Old 05-01-2012, 07:06 AM
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Originally Posted by calvindoesntknow View Post
Need some pictures of rear swaybars and how they mount so i can figure out how to make my upgrades trailing arms and differential support mount. Anything would be helpfull
As standard, from the factory, the presence or absence of rear anti-roll (USA = sway) bars, was a continuing story of fitted and not fitted. Only the 6 cylinder cars with sports pack suspension were always fitted with them.

As Doug said, the bar was fixed to the body above the diff/prop shaft, on the sloping bit of the body in front of the rear axle, by two brackets just like the front ones, that were fitted to studs protruding from this part of the body, with rubber bushes round the bar. The bar had a right angle backwards at each side the end of which bolted to the radius arm as shown in Doug's link photo.

FWIW, I believe the V12 handles much better without the rear bars, providing that the rear ride height is not too high and providing that the rear wheels have 1/2 to 3/4 of a degree of negative camber (adjusted by removing shims from the inboard driveshaft to diff coupling flanges). On my car this combination gave very progressive break away characteristics and very responsive adjustment to steering and power inputs.

Greg
 
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Old 05-01-2012, 07:38 AM
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Originally Posted by Greg in France View Post
FWIW, I believe the V12 handles much better without the rear bars, providing that the rear ride height is not too high and providing that the rear wheels have 1/2 to 3/4 of a degree of negative camber (adjusted by removing shims from the inboard driveshaft to diff coupling flanges). On my car this combination gave very progressive break away characteristics and very responsive adjustment to steering and power inputs.

Greg


Many agree.

I prefer the flatter stance so the rear bar was good for me. I'll say from experience though that a too-big rear bar is definately a bad thing on an XJS.....unless you *enjoy* very sudden breakaway at the limit!

I found that if a 4000 pound Jag gets away from me it's very hard to reel it back in :-)

After experimenting with different bars, if I had to do it all over again, I stick with the smaller standard bar...which was only 9/16th inch as I recall. You'll still get much flatter cornering and less understeer...but the car will remain predictable.

Cheers
DD
 
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Old 05-01-2012, 11:49 AM
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i was going to go with the one from fasterjags, and i already have the trailing arms, but i was planing on making trailing arms that mounted trianguraly to the frame rails of the car to make the rear suspension have strait up and down travel. If i can find a pic ill post it
 
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Old 01-27-2019, 09:44 PM
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This thread is the best I've found so far with regards to pictures (via the Jag-Lovers link) on where the Rear ARB (Sway) Bar Brackets should be located. That said I'd really appreciate it if anyone either the original fit or an aftermarket fit Rear ARB fitted to their XJS/6/12, if they could post up some more pictures and or dimensions of the brackets in relation to the chassis.

Yo very much appreciated!

Woz
 
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Old 01-27-2019, 11:06 PM
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See post #4 in this thread.....although not much is revealed

https://www.jaguarforums.com/forum/x...tinued-177670/

Cheers
DD
 
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Old 01-28-2019, 12:12 AM
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I wouldn't be surprised of the mounting holes are already there. My 94 V12 came from the factory with a rear bar. The rear ARB seemed to be an on and off again thing, depending on market and year. All the parts except the bar itself are available from Jaguar. https://www.jaguarclassicparts.com/u...bar-sportspack
 
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Old 01-28-2019, 03:32 AM
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My 1989 has the body mounts for the rear sway bar but not the radius arm mounts.

The body mounts will up under the back seat.
 
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Old 01-28-2019, 04:01 AM
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My car is an S1 XJ6, and I canít see any bolt holes or an area where the bracket would mount.

Doug, thanks for the pic ref. Thatís helps.
 
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Old 01-28-2019, 04:06 AM
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Originally Posted by Woznaldo View Post
My car is an S1 XJ6, and I canít see any bolt holes or an area where the bracket would mount.
All XJS coupes, or at least all I have seen, have studs, not bolt holes for the rear ARB, placed as Warrjon said, in the forward slope of the rear axle hump in the bodywork. Your series 1 XJS very likely did not have these studs fitted.
The radius arms, for the XJS at least, can be bought with or without the fixings for the ARB droplinks.

 
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Old 01-28-2019, 04:20 AM
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Hereís the underside of my car:



If I had dimensions I could mark everything out. Even the distance (Centre of bracket to centre of bracket) would really help.
 
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Old 01-28-2019, 06:50 AM
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Unlike the XJS, a rear bar was never intended for the Series I-II-III sedans so Jaguar never bothered to pre-install any of the hardware.

If opportunity permits in the next few days I'll take some location measurements from my installation.....which, frankly, wasn't the least bit scientific. I did a mock-up and drilled holes for the U-brackets taking into consideration where the surface of the floor pan was flattest, clearance for the ends of the bar, and other things which I've forgotten at the moment.

Cheers
DD
 
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Old 01-28-2019, 07:42 AM
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These pictures are not great, but show the location I used on a S1

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PS I have rear original bar for sale.

Rob
 
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Old 01-28-2019, 07:57 AM
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My 95 4.0 XJS coupe does not have the studs fitted in the floor under the rear seat, nor is the reinforcing steel plate installed on the underside of the body for the "U" brackets. My radius arms do have the mounting ears for the sway bar down links.
 
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Old 01-28-2019, 11:00 AM
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Best I can measure, the mounting brackets are 31" apart, center to center.
 

Last edited by Jagboi64; 01-28-2019 at 11:09 AM.
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Old 01-28-2019, 05:28 PM
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my XJS had the ARB , fitted 1978 V12, but talking with some local guys who raced the early XJS said to take it off,it will handle better!
so i been runnin round that way for 26yrs! i never drove the car when it was fitted , so i donno!
ron
 
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Old 01-29-2019, 07:28 AM
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Originally Posted by ronbros View Post
my XJS had the ARB , fitted 1978 V12, but talking with some local guys who raced the early XJS said to take it off,it will handle better!
so i been runnin round that way for 26yrs! i never drove the car when it was fitted , so i donno!
ron
Same old story, though. What works well on the track might not be ideal for street use. I feel safe in saying that the vast majority of people who add or upgrade anti-roll bars (on any car) are happy with the result. It's certainly possible to go overboard, though.

Jaguar itself apparently had difficulty deciding if the rear bar was worthwhile. All the pre-HE cars had one. After the HE was introduced the engineers (or accountants?) were very selective about using 'em.

Cheers
​​​​​​​DD

 
The following 2 users liked this post by Doug:
Greg in France (01-29-2019), ronbros (01-29-2019)

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