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  #13  
Old 03-31-2015, 09:49 PM
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Re: 2015 WK2 Summit Poor damping

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Originally Posted by higson View Post
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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I dropped the forteras at 10k and went to the alenza because of those tire rack ratings and it was a big mistake they could not get them to stop shaking also felt like driving on rocks, tire place tried countless road force balancing's replaced 3 of the 4 tires over a 2 month period but finally I could not take anymore. I had them put on the Michelin latitude tour HPs they were smooth as glass first time out the door. very happy with the HPs smooth, quiet, handle well and no more bouncing unstable feeling, have 11k on them and all is well. I did a write up on that alenza experience on here about a year ago.

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  #14  
Old 03-31-2015, 10:20 PM
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Re: 2015 WK2 Summit Poor damping

Wow thanks a lot. I've been running Bridgestone Potenza Pole Positions on my cars for years so I was inclined to stay with the brand. Will definitely check out the Michelin HPs and your earlier post.


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  #15  
Old 03-31-2015, 10:42 PM
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Re: 2015 WK2 Summit Poor damping

Quote:
Originally Posted by higson View Post
Wow thanks a lot. I've been running Bridgestone Potenza Pole Positions on my cars for years so I was inclined to stay with the brand. Will definitely check out the Michelin HPs and your earlier post.


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the Michelin Latitude Tour HPs are a very good highway cruiser, smooth, quiet and handle well. They are an all season tire but not a snow tire but I was doing fine in 8 inches of snow on unplowed streets this winter so do ok in snow also. If you are in a heavier snow climate I would recommend the nokian WRG3 SUV a good all season tire with an accent on snow climate. Nokians a little better on snow but may be a little noisier. The Tour HPs a little quieter but not as good as nokians in heavier snow climate.


Also just to clarify I had all the trouble with the alenza not the alenza plus. they are the same tread pattern and almost same tire, alenza plus is a different compound(probably harder) to make it last longer is the difference
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  #16  
Old 03-31-2015, 11:50 PM
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Re: 2015 WK2 Summit Poor damping

You may want to focus on the dampers (shock absorbers). In Australia we get the upgraded suspension pack which feels great at higher speeds (legal speed limits ). My build sheet from Jeep shows it has the Export Tuned Suspension option. I believe this is firmer dampening.
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  #17  
Old 04-01-2015, 12:06 AM
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2015 WK2 Summit Poor damping

1) just drive it for a couple of months. you may be surprised you don't feel the same way after you get used to it.

2) try driving in sport mode. it lowers half an inch and otherwise changes the demeanor.

my previous car was an Infiniti G35C 6MT and my wife's ride is an '08 RDX which has a sporty suspension and I don't mind my '14 Overland w/QL at all (and that's with 18" wheels and 32" AT tires). And even less so in sport mode.

remember she's a heavy beast.

good luck,

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  #18  
Old 04-01-2015, 12:27 AM
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2015 WK2 Summit Poor damping

Quote:
Originally Posted by higson View Post
Wow thanks a lot. I've been running Bridgestone Potenza Pole Positions on my cars for years so I was inclined to stay with the brand. Will definitely check out the Michelin HPs and your earlier post.


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I ran S02 PP and then S03 PP and liked them a lot. The Dueler Revo AT2 uses the same duel compound rubber and it's all I have run on our SUVs for many, many years.

-john

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  #19  
Old 04-01-2015, 07:41 PM
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Re: 2015 WK2 Summit Poor damping

I came from a Lexus GX which had a very comfy bouncy ride. But at the end of the day I prefer the way my Summit handles. Corners great and has a nice tight feel to it. Definitely a firm ride but I like it.

I wouldn't change a thing. Well...maybe a softer seat.

But to each their own.

Cheers
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  #20  
Old 04-02-2015, 10:58 PM
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Re: 2015 WK2 Summit Poor damping

The Export Tuned Suspension is interesting. Definitely different Mopar part numbers. Still can't risk dropping $4k to upgrade all 4corners and most likely void my lifetime warranty.

Really surprised there aren't many aftermarket suspension bits.


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  #21  
Old 04-03-2015, 09:14 AM
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Re: 2015 WK2 Summit Poor damping

ARGH, I can't stand it! I'm getting a ton of high frequency vibration through the steering wheel (and my seat). Yeah I know this isn't a sport sedan, but it's not a luxury cruiser either if I can feel every tiny road imperfection. Bigger bumps, like speed bumps, are handled fine, but the high-frequency vibration is driving me nuts.

I have to ask: Am I nuts? Don't think so but for some reason this is REALLY getting to me...

After I parked the car, I tried to rock the car back and forth manually and see where the movement and bounce is coming from. Couldn't see any movement in the suspension, but a lot in the tire, including multiple oscillations. These Forteras appear to have very little sidewall strength and zero intrinsic damping.

Seems like the air suspension is designed such that it doesn't/can't soak up high-frequency oscillations.

I keep coming back to the tires...


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  #22  
Old 04-03-2015, 12:08 PM
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Re: 2015 WK2 Summit Poor damping

Quote:
Originally Posted by higson View Post
ARGH, I can't stand it! I'm getting a ton of high frequency vibration through the steering wheel (and my seat). Yeah I know this isn't a sport sedan, but it's not a luxury cruiser either if I can feel every tiny road imperfection. Bigger bumps, like speed bumps, are handled fine, but the high-frequency vibration is driving me nuts.

I have to ask: Am I nuts? Don't think so but for some reason this is REALLY getting to me...

After I parked the car, I tried to rock the car back and forth manually and see where the movement and bounce is coming from. Couldn't see any movement in the suspension, but a lot in the tire, including multiple oscillations. These Forteras appear to have very little sidewall strength and zero intrinsic damping.

Seems like the air suspension is designed such that it doesn't/can't soak up high-frequency oscillations.

I keep coming back to the tires...


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Do you have the steering wheel vibration all of the time or do you mean only when you hit road imperfections you get the vibration? If its all the time try going in for a road for balance you may have a balance issue or god forbid a bent rim. if its only the road imperfections when it vibrates, that type of feedback into the steering wheel is just how it is unfortunately, tires will not likely make much difference, the forteras are about as soft and mushy as you are going to find in that size. Stiffer better performing tires like I mentioned above improves the handling and stops the bouncing like a basketball feeling the forteras have but you will still get steering wheel feedback on those smaller bumps.
Agree the suspension is not giving you the majority of that bounce feeling maybe some but its more the tires. i have had my 2014 summit 2 years and 21, 000 miles and already been through the shaking, the bouncing, tire changing and all that and looked at it every which way.

If you want the softer, mushier, bouncier ride stay with the forteras, if you happen to have ones that don't shake that is. If you want a better handling, no bouncing ride with more road feel then change the tires into some of the more quality tires mentioned.
You will likely have the steering wheel feedback over minor bumps with either one of them that is likely just a characteristic of the suspension you will need to get used to.
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  #23  
Old 04-03-2015, 12:59 PM
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Re: 2015 WK2 Summit Poor damping

Vibration into your steering is more likely tire/wheel related. If you have the OEM Forteras, there have been reported issues with this for years now. I never had that over the almost 40K miles I drove on them, but others have.
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  #24  
Old 04-03-2015, 01:40 PM
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Re: 2015 WK2 Summit Poor damping

Those tires have got to go. Need something with firmer sidewalls/better handling & damping.


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