Absolute Pace

Go Back   Club Cobra > Club Forums > Australian Cobra Club

Welcome to Club Cobra!  The World's largest non biased Shelby Cobra related site!

  •  » Representation from nearly all Cobra/Daytona/GT40 manufacturers
  •  » Help from all over the world for your questions
  •  » Build logs for you and all members
  •  » Blogs
  •  » Image Gallery
  •  » Many thousands of members and nearly 1 million posts! 

YES! I want to register an account for free right now!  p.s.: For registered members this ad will NOT show

MMG Superformance
Nevada Classics
Main Menu
Nevada Classics
Nevada Classics
MMG Superformance
Advertise at CC
Banner Ad Rates
Keith Craft Racing
MMG Superformance
MMG Superformance
March 2024
S M T W T F S
          1 2
3 4 5 6 7 8 9
10 11 12 13 14 15 16
17 18 19 20 21 22 23
24 25 26 27 28 29 30
31            

Kirkham Motorsports

Like Tree5Likes
  • 1 Post By stephen low
  • 3 Post By Treeve
  • 1 Post By joyridin'

Reply
 
LinkBack Thread Tools Rate Thread Display Modes
  #1 (permalink)  
Old 07-31-2019, 08:30 PM
CC Member
Visit my Photo Gallery

 
Join Date: Dec 2006
Location: Melbourne Australia, VIC
Cobra Make, Engine: RCM
Posts: 8
Not Ranked     
Default Jag IRS coilover setup

Hi guys.
Am setting up my suspension for an attempt at participating at the Nationals this year and at the moment am running stock jag coilovers.
Will be swapping over to adjustables with new springs.
Now for my question. Do I need to run 4 x coilovers or can you run just the one shock per side with the heavier spring and get away with it. Has this been done ?
Without issues.
Thanks in advance.
Reply With Quote
  #2 (permalink)  
Old 07-31-2019, 10:08 PM
CC Member
Visit my Photo Gallery

 
Join Date: Apr 2011
Location: Orange, NSW
Cobra Make, Engine: Dax
Posts: 429
Not Ranked     
Default

It’s been done but the 2 shocks setup is part of resisting torsional loads through this suspension. I always recommend people stick with it instead of trying to fit one that’s twice the size.
Reply With Quote
  #3 (permalink)  
Old 08-01-2019, 03:19 AM
Banned
Visit my Photo Gallery

 
Join Date: Sep 2015
Cobra Make, Engine: Rowan Replicars, 352 4V
Posts: 94
Not Ranked     
Default

When I installed a Jag Rear end on my replica, I researched using one shock per side. As stated, it's not worth the risk to save money, although some Hot Rod builders go that way. Jag LCRs have lots of weak spots, and proper balance at the shock mount is critical.
__________________

Rowan Replicars 1965 Cobra Replica
352 4V, T5, Jaguar Posi rear end with 3.30 gears.
https://www.facebook.com/pormgb/
Reply With Quote
  #4 (permalink)  
Old 08-01-2019, 05:01 AM
Gaz64's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2008
Location: Brisbane, QLD
Cobra Make, Engine:
Posts: 2,773
Not Ranked     
Default

Quote:
Originally Posted by Treeve View Post
It’s been done but the 2 shocks setup is part of resisting torsional loads through this suspension. I always recommend people stick with it instead of trying to fit one that’s twice the size.
Yes, fully agree, that is why they were designed that way.

The control arms don't have to fight against springs on only one end of the arms. Control arm bushes have no chance with only one heavy spring.

Gary
Reply With Quote
  #5 (permalink)  
Old 08-01-2019, 06:19 AM
CC Member
Visit my Photo Gallery

 
Join Date: Dec 2013
Cobra Make, Engine: Evans chassis, jag fr. & rear.
Posts: 149
Not Ranked     
Default

Great question Nick.

I won't even think of trying it based on the advice received above.
Cheers
Dave
Reply With Quote
  #6 (permalink)  
Old 08-01-2019, 10:47 AM
CC Member
Visit my Photo Gallery

 
Join Date: May 2013
Cobra Make, Engine:
Posts: 13
Not Ranked     
Default

what spring rate is everyone using? I went with #350 and it'sa little too firm.
Reply With Quote
  #7 (permalink)  
Old 08-01-2019, 06:19 PM
CC Member
Visit my Photo Gallery

 
Join Date: Dec 2006
Location: Melbourne Australia, VIC
Cobra Make, Engine: RCM
Posts: 8
Not Ranked     
Default

Quote:
Originally Posted by csx4995 View Post
what spring rate is everyone using? I went with #350 and it'sa little too firm.
Thanks for the input guys. Looks like 4 new coilovers.
Re spring rates if you get on the Ridetech website they have a handy springweight calculator. Based on the weights and dimensions of my car it came up with 500lbs per corner. So 2 x 250lbs springs per corner.
It must be accurate as the shock supplier came up with the same spring rate based on the same info I supplied them.
Reply With Quote
  #8 (permalink)  
Old 08-02-2019, 04:20 AM
stephen low's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Aug 2001
Location: Melbourne, Australia, Vic
Cobra Make, Engine: G-Force Mk I, 5L Windsor, TKO 600, enhanced Jag / Koni suspension & LSD Diff.
Posts: 2,298
Not Ranked     
Default

Nick

The advice above is no doubt accurate but there are plenty of Victorian cars that have had this conversion over a long time and I've not heard of any shock/suspension system failures.

It also has to be remembered that the cobra carries far less weight than the original Jaguar, perhaps this is a mitigating factor.

Anyway, my car's journey to date and I am happy with the handling and engineering.

Single adjustable shock with 400lb spring to rear of control arm. Original springs were 250lbs each.



Heavier drive shaft, double rose jointed training arm and adjustable lower hub to control arm adjustment. This combination made rear end alignment a dream



Inboard disc conversion to XJ308 outboard disc amendment with larger piston option. The car has significantly increased braking capacity as a result and no access issues to the rear brakes the inboards pose.



Anyway if you have build time, it would be worth a chat through the Victorian club on this option.

Cheers
Rob. Smith likes this.
__________________
slowy
Reply With Quote
  #9 (permalink)  
Old 08-02-2019, 05:41 AM
CC Member
Visit my Photo Gallery

 
Join Date: Nov 2016
Location: Brisbane, QLD
Cobra Make, Engine: G Force Cobra 347 stroker
Posts: 60
Not Ranked     
Default

Hi Nick. The rear arms look good. What brand shock are you using?
Thanks Neil
Reply With Quote
  #10 (permalink)  
Old 08-02-2019, 09:47 AM
Danr55's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: May 2007
Location: Mesa, AZ
Cobra Make, Engine: Contemporary Classic, 428 FE CCX 3069
Posts: 7,500
Not Ranked     
Default

If you are going to be accelerating hard, you will want at least 350# springs on all four. Anything less you risk rubbing the tires on the inside of the wheel well.
__________________


Dan in Arizona
CCX3209


"It's a great car and I love it, but it doesn't do 'SLOW' very well."
Reply With Quote
  #11 (permalink)  
Old 08-04-2019, 05:00 AM
CC Member
Visit my Photo Gallery

 
Join Date: Apr 2011
Location: Orange, NSW
Cobra Make, Engine: Dax
Posts: 429
Not Ranked     
Default

If you go to outboard discs then you really need to consider going to the original two spring setup. By removing one spring you are forcing the bushes etc to carry all of the acceleration loads. Then with the outboard brakes you are now putting your torsional loads back through a single spring too. Jag engineers didn’t put two springs for a laugh and to make their cars more expensive. They did it because they understood the load paths in their design.
Gaz64, citric acid and muzzza like this.
Reply With Quote
  #12 (permalink)  
Old 08-06-2019, 06:54 AM
CHANMADD's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Mar 2006
Location: San Marcos california, CA
Cobra Make, Engine: 1989 KCC from South Africa Right Hand Drive
Posts: 1,597
Not Ranked     
Default

You all missed the question. Is it ok to run one heavier spring per side. He did not say he was going to run only one spring ..just different rates.....Please read.In other words one stock Jag shock and spring and one adjustable per side.

Last edited by CHANMADD; 08-06-2019 at 06:57 AM..
Reply With Quote
  #13 (permalink)  
Old 08-06-2019, 01:15 PM
joyridin''s Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2009
Posts: 1,689
Not Ranked     
Default

Quote:
Originally Posted by CHANMADD View Post
You all missed the question. Is it ok to run one heavier spring per side. He did not say he was going to run only one spring ..just different rates.....Please read.In other words one stock Jag shock and spring and one adjustable per side.
From his last post "Thanks for the input guys. Looks like 4 new coilovers."

Sounds like 4 instead of 2 to me!
CHANMADD likes this.
Reply With Quote
  #14 (permalink)  
Old 08-09-2019, 08:26 PM
CC Member
Visit my Photo Gallery

 
Join Date: Dec 2006
Location: Melbourne Australia, VIC
Cobra Make, Engine: RCM
Posts: 8
Not Ranked     
Default

After speaking to several shock companies the idea of running 1 adjustable together with 1 standard jag shock per side was not recommended.

(As far as running one Adjustable and one standard shock, this is doable, but it may be difficult when you’re trying to get tuning sorted out. If the standard shocks are progressive valving while ours are digressive, you may not be getting the ride you want out of them)

Anyhow I pulled the trigger on 4 coilovers and 4 springs.

Thanks for all the input.
Reply With Quote
  #15 (permalink)  
Old 09-05-2019, 12:38 AM
Donunder's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Nov 2008
Location: Brisbane Australia. Cobra:Arntz Chev 454,
Posts: 847
Not Ranked     
Default

So, after all the research Nick, which shocks did you settle on?
I ask because my forty year old Jag originals are becoming a bit floaty and I'm also in the market.
The brand I keep hearing about are Vikings.
__________________
Don.
Reply With Quote
  #16 (permalink)  
Old 09-09-2019, 08:07 AM
CC Member
Visit my Photo Gallery

 
Join Date: Dec 2006
Location: Melbourne Australia, VIC
Cobra Make, Engine: RCM
Posts: 8
Not Ranked     
Default

I looked at a few brands (AVO,QA1,Gaz) purchased Vikings.
I got a deal on shocks and springs from the Castlemaine Rod Shop.
Haven’t tested them so can’t comment on ride yet.
Reply With Quote
Reply


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 12:32 PM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link: CC Policy