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  #25  
Old 04-03-2015, 01:44 PM
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Re: 2015 WK2 Summit Poor damping

Replacing tires after 1800 miles is just sad.


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  #26  
Old 04-03-2015, 05:19 PM
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Re: 2015 WK2 Summit Poor damping

At 1800 miles with that kind of shake, rattle and roll...it would be the dealer replacing them.
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  #27  
Old 04-04-2015, 07:42 PM
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Quote:
Originally Posted by higson View Post
Replacing tires after 1800 miles is just sad.

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It is sad but you would be surprised how many people on here change them out early because they dont like the fortera. I put up with them until 10k before dropping them. Not much value to them, they are a low grade low cost tire to start and as used just not much value there. You could try to sell them as used if you could find someone to buy them and wanted to try and mess with shipping but dont expect much. I dumped mine on a used tire dealer for about $80 for all four, not worth the time to me to try and sell.

Dealer wont help you out unless they are defective and out of round which a lot are. But if you just plain dont like them its on your nickel to replace them
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  #28  
Old 04-04-2015, 10:51 PM
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Re: 2015 WK2 Summit Poor damping

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Originally Posted by higson View Post
Just got my 2015 Summit 5.7 about 3 months ago (my first Jeep). Love the car overall, but the amount of bounce/wobble (not death wobble) I get when driving at low speeds over bumps is just way more than what I'm used to (granted I switched to the jeep from an Acura TSX).

Reading other threads, it seems like this is a design issue rather than a problem with my particular jeep.

I'd like to get to the root cause and then a possible fix:

* Is this caused by the QuadraLift?
* Is this caused by poor rear shocks?
* Is this caused by sway bars that aren't stiff enough?

In trying to research possible fixes, all I've come across is to replace the sway bars with SRT bars and links. I can't find aftermarket replacements for the rear shocks (fronts are a non-starter since they're integral with the QL system).

Anyone else experiencing this and/or found a fix?

What you pointed out is quite interesting. I may have a similar situation. Here is what I discovered in my Summit- mind you, this is coming from my personal perspective and maybe quite different from others.

1. The car is better at absorbing bumps and minor potholes at higher speeds than lower ones. The faster I go, the better it responds. At lower speeds, I can feel it a bit more- kind of a rickety, disjointed feeling.

2. It still takes regular bumps with better ease and comfort than many cars- suspension travel is good in normal ride position. It does not ride as smooth as a Caddy but it is quite responsive- tighter and sportier suspension- thanks to the Mercedes Benz foundation.

3. This is the one you may find in common: although it absorbs bumps decently, there is still a bit of a bouncy, jaunty ride especially when going over any kind of imperfection in the road. It is almost like a ship's movement rolling over rougher waves- you don't really feel the shocks impacting you like a lowered suspension in a sports car, but you feel the car in a "Rodeo" mode going from left to right in a smooth but totally bouncy way on roads that are not quite flat.

I am quite used to this by now and can live with it especially after coming from the Moton suspension of some Sports cars I have modded over the years. No matter what shocks or springs or coilover set-up you put on the Jeep, there is little improvement over this feeling (No.3) except in better times on the track! Tires can improve the ability to absorb a little more of the bumps, or give more feedback or less, or provide better cornering and lateral movement and grip, but does very little for this slight bouncy movement. It is part of the character of the Quadra-Lift suspension I guess. There are worst things that one can live with and this is just the nature of the beast.
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  #29  
Old 04-05-2015, 09:23 AM
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Re: 2015 WK2 Summit Poor damping

I suppose that the issue what we are discussing is definitely initial shocks tune problem, an issue specific for Q-lift suspension.
I have two set of wheels, one is 18" with soft winter Nokia tires 265/60/R18 and the second summer one is 20" with enought rigid Kumho tires. And might be European specification as well (suppose there are no real difference in shocks adjustments)
Yes, of course , the winter's sets provides more smooth bumping, but the overall impression is the same. Too hard on road unevenness and too soft and floaty when its not needed like highway cornering, etc.
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  #30  
Old 04-16-2015, 06:14 PM
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2015 WK2 Summit Poor damping

I jacked my tire pressure back up to 40 and at least my rig doesn't feel like I'm driving on gumballs anymore...

Thinking of upsizing my tires (and rims?) to SRT 295s. The stock Summit rims are only 8" wide and even the 265s seem to be a bit of a stretch.

Any suggestions? Maybe a straight swap for a set of SRT rims and tires?

EDIT: Sorry I know the SRT wheel swap is already well covered in other threads.


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  #31  
Old 05-01-2015, 02:39 PM
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Re: 2015 WK2 Summit Poor damping

I'm not sure if it's a tire issue or not, had my 2015 GC Altitude with Goodyear re balanced and there was no change. After really paying attention to the steering movement it seems more based on the roughness of the road then a balance issue.

The only thing I want to add to this is mine didn't start till around 5000 miles steering was solid and felt very controlled. Now it just seems to be sloppy it reacts to every bump in the road, dealer says it's normal well then way now and not from day one. It's not the worse out vehicles I've owned but why now
it was a dream for until after 5000 miles or so.
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  #32  
Old 05-07-2015, 02:29 PM
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Re: 2015 WK2 Summit Poor damping

Does anyone know if Jeep has there own forum where are voices are heard and gives them a chance to reply. I ask this because GMC does, and after reading on some issues they have, there's been reply from customer support personal.


This forum has been great source for helping us all solve issues, but I just wish there was a more direct way of them knowing how owners of there product feel instead of us running to dealers and getting nothing but the run around with I never heard of this before or they all do it !
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  #33  
Old 08-02-2015, 10:33 PM
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Re: 2015 WK2 Summit Poor damping

Still haven't switched out the Forteras yet, but I did notice that the ride of my Summit gets noticeably better (less bouncy, better damped) in OR1 compared to NRH or Aero. Anyone else noticed that?


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  #34  
Old 08-03-2015, 08:47 AM
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Re: 2015 WK2 Summit Poor damping

Quote:
Originally Posted by higson View Post
... I did notice that the ride of my Summit gets noticeably better (less bouncy, better damped) in OR1 compared to NRH or Aero. Anyone else noticed that?
Yep... this is a shortcoming of Quadralift in my opinion. I'd love some better shocks up the back.

Cheers,
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  #35  
Old 08-03-2015, 04:11 PM
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Re: 2015 WK2 Summit Poor damping

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Originally Posted by Barboots View Post
Yep... this is a shortcoming of Quadralift in my opinion. I'd love some better shocks up the back.

Cheers,
Steve
The rear shocks are easily replaceable, even on QL. The fronts are the ones we can't change because they are an air strut with the airbag integrated into the shock body itself.
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  #36  
Old 08-03-2015, 04:29 PM
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Re: 2015 WK2 Summit Poor damping

Know of any aftermarket rear shocks that will fit QL? I can't seem to find any.


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