Dobinson suspension - Page 2 - Jeep Garage - Jeep Forum

Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WK2 - > Export Grand Cherokee 2011+

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #13  
Old 11-26-2015, 05:31 AM
Barboots's Avatar
Senior Member
My Jeep: 2014 3.0L WK2
 
Join Date: Aug 2013
Location: Perth, Western Australia
Posts: 2,371
Thanks: 130
Thanked 329 Times in 282 Posts
Rep Power: 10602
Barboots has disabled reputation
Re: Dobinson suspension

Quote:
Originally Posted by Barboots View Post
... but what else was problematic and subsequently attributed to your fit out? List? Rake? Under-dampened or under-sprung? Something else?
Got a moment to expand on the issues with the system Simon?

Cheers,
Steve

__________________
2014 Overland CRD
Perth, Western Australia
Reply With Quote
Sponsored Links
Advertisement
 
  #14  
Old 11-26-2015, 08:37 AM
sironic's Avatar
Member
My Jeep: 2014 3.6L WK2
 
Join Date: Jun 2014
Location: Perth WA
Posts: 207
Thanks: 81
Thanked 44 Times in 32 Posts
Rep Power: 1123
sironic is on a distinguished road
Garage
Re: Dobinson suspension

Quote:
Originally Posted by MP14 View Post
Let me know how you go with Wangara tomorrow...I may be able to get the lift done earlier if they can do a package deal; let me know!



Are you looking to get the median or heavy duty springs? I've read others have gone the heavy duty springs to get the lift with skid plates but hopefully the ride isn't too harsh (as Wanderer stated previously).



The front end of our Jeep currently sags quite a bit and all Iíve got there are Chiefís recovery hooks. This could be due to early settling from Wilbinga. I also have the Chief sump protection plate but have not installed. ARB Osborne Park suggested going for the Bullbar front springs which assume a 50kg load which may lift the nose a bit higher.

I ended up with the heavy duty springs all round. Had sag even with the lift after the light duty springs were installed. The following accessories are installed - 2 Chief hooks, LFG, sump guard, transmission plate, Mopar underbody kit. Mopar tow hitch.

The ride is somewhat harsh over bumps in the road, but only at the rear. I should add I am running LT AT tyres.

I found that even with the HD rear springs, when I tow my Jayco Flamingo, the rear sags, causing angry oncoming drivers at night.

Im pretty happy with the handling on and off road, overall. Just have a knocking noise somewhere up front now, that is proving difficult to diagnose. My 11th visit to ARB since June is tomorrow... It's getting really old now.


Cheers, Simon
Reply With Quote
  #15  
Old 11-26-2015, 06:04 PM
sironic's Avatar
Member
My Jeep: 2014 3.6L WK2
 
Join Date: Jun 2014
Location: Perth WA
Posts: 207
Thanks: 81
Thanked 44 Times in 32 Posts
Rep Power: 1123
sironic is on a distinguished road
Garage
Re: Dobinson suspension

Quote:
Originally Posted by Barboots View Post
Sounds like a line to me Simon. I can't imagine bash plates, a fridge and the other "normal" touring stuff materially affecting suspension performance to the point you'd need to complain.

Obviously the link left off would produce negative effects, but what else was problematic and subsequently attributed to your fit out? List? Rake? Under-dampened or under-sprung? Something else?

Cheers,
Steve

Hi Steve
The condensed version
When I initially got the lift done, the front ride height with bullbar springs fitted was too high. The lighter springs were tried out up front and it was then way too low. I had the bullbar springs put back in, and then blew $800 on the Chief LFG after ARB told me to add more weight up front. It made no difference. After much rumination they decided to put the heavier duty springs at the rear, and at that point I had the correct ride height front and back (in line with the advertised ride heights for that lift).
Now I have the clunking noise. Jeep are telling me the angle of the tierod ends is too steep due to the lift, and that this is causing the knocking I have due to the steering hitting 'stops'. I'm dubious about this as they seemed to presume the noise only happens with steering wound on, but I told them the noise is also heard on the straight ahead. Plus I don't know that they even physically looked into the issue when I left it with them.
Back at ARB this morning for them to take another look. If they don't fix it today, I'm going to look for a decent suspension/steering shop and just fork out the cash to have them find the fault.


Cheers, Simon
Reply With Quote
  #16  
Old 11-26-2015, 08:50 PM
Barboots's Avatar
Senior Member
My Jeep: 2014 3.0L WK2
 
Join Date: Aug 2013
Location: Perth, Western Australia
Posts: 2,371
Thanks: 130
Thanked 329 Times in 282 Posts
Rep Power: 10602
Barboots has disabled reputation
Re: Dobinson suspension

Simon I really, really don't believe your fit out was in any way responsible for the ride height issues you've highlighted. There was a cock-up. Realistically, the protective parts are not that heavy when put in perspective with rear passengers and load.

Regarding the ride... IMO it can be very hard to pick what is responsible for overly harsh suspension performance. Soft is easier, well for me anyway! Consider working out the approximate kg/cm or pounds per inch of the coils for both the OME and Original Equipment. Whilst this data may be available for the OME, I suspect that it will be unobtainium for the OE part. The simple way to start getting to the guts of it would be to measure the rear suspension height of your car and an unmodified one with 3 or more (more the better) full jerrys in the boot. That will give you a comparison of spring rate. If they are similar, it's possible the shock's compression or rebound are too stiff, causing the harshness you are reporting. My gut feeling is that it's now slightly over-sprung.

Is the headlight "flaring" problem when towing all the time, or a function of undulating roads? What is the ball weight of your camper? Bear in mind you don't have load-levelling any more, and that would easily have masked the same effect with the OE spring rate.

The steering knock... is it as you strike a bump, or more as you leave a bump???

Cheers,
Steve
__________________
2014 Overland CRD
Perth, Western Australia
Reply With Quote
  #17  
Old 11-26-2015, 11:19 PM
sironic's Avatar
Member
My Jeep: 2014 3.6L WK2
 
Join Date: Jun 2014
Location: Perth WA
Posts: 207
Thanks: 81
Thanked 44 Times in 32 Posts
Rep Power: 1123
sironic is on a distinguished road
Garage
Dobinson suspension

Damaged front passenger side strut... Being replaced now, hoping that is the end of it.

Edit: wasn't the end of it. Both front struts were found to be damaged (installer fail) and replaced. They swapped in the diesel variant springs. Ride and handling feels better, front and rear ride height has dropped an inch.
And the same clunk is still there, but sounds more muted, and didn't seem to happen as readily.
Reply With Quote
  #18  
Old 11-28-2015, 09:08 PM
Member
My Jeep: 2013 3.0L WK2
 
Join Date: Aug 2012
Location: Western Australia
Posts: 26
Thanks: 1
Thanked 3 Times in 3 Posts
Rep Power: 1605
jesse270 is on a distinguished road
Re: Dobinson suspension

Mate that's a lot of issues, they must of really stuffed things up, not to sure but I have heard of some faulty springs, maybe a faulty batch going around.

I Had a talk to arb Wangara they say they have lifted a few wk2s with no issues and issues would be very rare. But I cant believe everything they say.

Also they didn't want to budge on price to much. Only 5% off $2186 if I get 2 cars in, but I didn't try push it, probably could get it cheaper if I was going to book my car in asap. But I don't know if I could get them down to $1870.

Sironic, when you got that price were you getting anything else done from them other than suspension?
Reply With Quote
  #19  
Old 11-29-2015, 12:07 AM
sironic's Avatar
Member
My Jeep: 2014 3.6L WK2
 
Join Date: Jun 2014
Location: Perth WA
Posts: 207
Thanks: 81
Thanked 44 Times in 32 Posts
Rep Power: 1123
sironic is on a distinguished road
Garage
Re: Dobinson suspension

Hi Jesse, no I just bought the suspension kit, nothing else. Because they had no competitor selling OME, I just told them I was looking at the Dobinsons, but would go with the OME if they gave me a price that was a bit closer to that of the Dobinson kit. Negotiation was done via email.
Hope this helps


Cheers, Simon
Reply With Quote
  #20  
Old 01-27-2016, 08:57 AM
Member
My Jeep: 2013 3.0L WK2
 
Join Date: Aug 2012
Location: Western Australia
Posts: 26
Thanks: 1
Thanked 3 Times in 3 Posts
Rep Power: 1605
jesse270 is on a distinguished road
Re: Dobinson suspension

Just giving an update. Returned most of my ARB kit today.

Didnt end up fitting the front. As I had the heavy duty springs and didnt want a 3inch lift front. (problems with the medium springs only lifting like 10mm)
Only gave me a 30mm lift in the rear (would prob drop even more over time).
Also wasnt to happy with the rear shocks they wearn't any longer than the stock ones.


Keeping the front struts as they are longer and just orderd some raised king springs for front and rear.
Kings only give 40mm lift. So going to put top out plates in the front and some on the stock load leveling rears to get about 50mm lift all around.

I suggest to stay away from arb at least to they sort there shit out.
Reply With Quote
The Following User Says Thank You to jesse270 For This Useful Post:
Reply

Tags
suspension

Thread Tools
Display Modes

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 Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
The complete (05-10) WK Grand Cherokee suspension thread Scottina06 Suspension/Brakes/Wheels/Tires 999 10-19-2016 05:19 PM
Suspension mods- is the Grand Cherokee suspension the same? Scottina06 2011+ Dodge Durango-WD 3 06-25-2012 02:53 PM
what to do for suspension jdubgrand Grand Cherokee - WK 1 10-31-2009 01:00 AM
WK suspension upgrade recommendations? scottydog Grand Cherokee - WK 11 09-01-2009 04:33 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 12:44 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by FCA US LLC. Chrysler, Dodge, Jeep, Ram, Mopar and SRT are registered trademarks of FCA US LLC.