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Old 03-26-2015, 11:59 PM
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2015 WK2 Summit Poor damping

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?

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  #2  
Old 03-27-2015, 04:09 AM
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Re: 2015 WK2 Summit Poor damping

I have the same issue. I do not like stock shocks for air lift suspension at all. The stocks ones are regressive damping shocks instead of being progressive. I mean shocks are too tough at low displacements (at low amplitude and high speed shifts on bumpy road ) and too soft when cornering at speed or high amplitude movements needed.....so converting a car into a boat sometimes. It should be vise versa. My wife's 2006" LR D3 doing that exercises much better with original and never replaced shocks.
I am also looking what to do.


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Old 03-27-2015, 04:38 AM
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Re: 2015 WK2 Summit Poor damping

Theoretically, the front ones could be disassembled to air struts and shocks. Similar to Mercedes ML or GL.
I wonder if new bilstein shocks for conventional suspension can be putted in. There a good chance that the shocks inside are the same.
But first of all I have to order bilsteins, disassemble my front assembly, check the sizes, etc, so its a big and expensive project and I am glued to what I have at the moment.

http://cart.bilsteinus.com/images/pr...4-225410_1.jpg


Part Number: 24-225410


Series: 4600 Series

*Collapsed Length (IN): 26.28
*Extended Length (IN): 31.48
*Collapsed Length (MM): 667.6
*Extended Length (MM): 799.6
*Compression @0.52m/s: 1120
*Rebound @0.52m/s: 1925
Finish: Zinc Plated
Reservoir: No
Body Design: 46mm ID Smooth Body (Non-Coilover)


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Old 03-27-2015, 10:30 AM
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Re: 2015 WK2 Summit Poor damping

Tires also make a difference...my Nittos feel totally different around "the bounce" than the OEM Forteras did. In some cases, better; and in some cases, worse.
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Old 03-27-2015, 10:35 AM
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Re: 2015 WK2 Summit Poor damping

What tires pressure do you guys run? Notice any difference between 35 and 40 psi?



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Old 03-27-2015, 11:07 AM
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Re: 2015 WK2 Summit Poor damping

I agree with Jim above on this tires can make a big difference. The forteras it comes with are mushy bouncy soft tires. When I first got my 2014 GC Summit there were times going down wavy roads with humps that I felt like the jeep was almost destabilizing it got to bouncing and rolling so much. later I found out that this was much due to the tires. I only kept the fotreras for 10k miles for a variety of reasons but the Tour HPs I put on were a much better and stable tire handling a lot better. You'll get dozens of different recommendations on tires on here, but in the end you have to buy them how you use them there is a different right tire for everyone. the Michelin Tour HPs that I got are an excellent highway cruiser that handles well and is smooth and quiet. if you are in a snowier climate take a look at the nokian WRG3 SUV a good all season with accent on snow climate.
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Old 03-27-2015, 02:06 PM
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Re: 2015 WK2 Summit Poor damping

I run mine at 37psi which is what DiscountTire suggested for the Nittos. The Forteras I ran at 38psi.
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Old 03-30-2015, 08:33 AM
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Re: 2015 WK2 Summit Poor damping

Thanks for the tire recommendations. I was thinking about that too but the idea of spending another $1500 on a brand new car rubs me the wrong way. I bought the car because last year I ended up renting a 2014 GC Limited and loved it. Handled confidently. But of course it didn't have Quadralift and most likely had 18" wheels and different tires.


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Old 03-30-2015, 08:49 AM
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Quote:
Originally Posted by higson View Post
Thanks for the tire recommendations. I was thinking about that too but the idea of spending another $1500 on a brand new car rubs me the wrong way. I bought the car because last year I ended up renting a 2014 GC Limited and loved it. Handled confidently. But of course it didn't have Quadralift and most likely had 18" wheels and different tires.

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I hear you about spending more money on tires after spending all that money on the GC i didnt like it either and i liked even less spending money on 2 bent rims but thats another story. But i think a good bit of that mush and bounce is more tire related than quadralift. To me the feel of the air suspension is not all that different than suvs without it. I actually think the GC handles pretty well for a heavy suv much more car like than i had expected cerntainly no sports sedan but its good for what it is. Maybe you will get used to it but whenever you decided tire time comes try a different one than the stock fortera.
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Old 03-30-2015, 10:15 AM
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Re: 2015 WK2 Summit Poor damping

I don't think this is tire related at all. The suspension is just floaty over crests in the road, very easy to feel while going around corners. When the Jeep comes down off a crest, it takes at least two oscillations before it settles itself. I'd say the shocks are just tuned for a soft ride, not sporty at all. Understandable since this is an off-road luxury vehicle basically.

I was hoping there would be a way to use the Eibach sport shocks that you can get with their lowering springs for the WK2, but it seems the shocks are integrated into the front struts, so we're probably screwed. Wish we could get the SRT shocks, but they are electronically controlled and I doubt any of that would transfer over.
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Old 03-30-2015, 11:06 AM
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Re: 2015 WK2 Summit Poor damping

I think everyone will have a different opinion on this but having driven on the forteras for 10k miles and now on the Tour HPs for 11k miles you do feel a difference with a stiffer tire they handle better and have less bounce. The bouncing unstabilizing feel of the forteras was on of the many reasons I dumped them early. You will feel more bumps in the road with a stiffer tire, so you really need to decided if you want mush and bounce or feeling a few more bumps but a more stable feeling tire. im not saying its entirely tire certainly this is an suv suspension and its going to be soft so don't compare it to driving a sports sedan. Certainly replacing tires early is an expense and someone would need to decided if it was worth it to replace early or just when they are ready but consider a different tire whenever the time comes. many people are ok with the fortera and many people hate them obviously I am one of the haters. just my opinion but its just to expensive of a machine to drive around for 40k miles on garbage like that.
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Old 03-31-2015, 06:34 PM
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Re: 2015 WK2 Summit Poor damping

This is probably a compound issue. Suspension tuning is not easy and many manufacturers get it wrong. With respect to the excessive bounce/poor damping, the tires, springs (air springs in this case), and shocks all contribute. Unfortunately they only bits that we can change are:

Tire Pressure
Tires
Rear Shocks (though I can't find any qualified replacements at the moment).

Just for grins I dropped my tire pressure on my Froteras to 36psi (factory spec on the driver door jamb). The ride is noticeably less bouncy than at 38-39psi, but still not where I want it.

The top ranked tires on TireRack are the Perelli Scorpion Verde Plus ($211 each) and Bridgestone Dueler H/L Alenza Plus ($204 each).

Anyone try these?

Anyone found replacement rear shocks?

I also noticed a number of TSBs about leaking shocks, though my dealer said he found no issues with my vehicle.


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