Performance Pack suspension bouncy?

[David@Steeda]

I've recently purchased the Steeda progressive spring kit. I really had no desire to lower my EB, but I'm willing to do so if these springs will stop the bounciness. My initial plan is to install the rear springs only. Why?

- 90% of the bounce seems to come from the rear
- The rear springs are easier to install than the fronts

IF the Steeda progressive rear springs remove the bounce then I'll definitely install the front progressives as well. I realize the Steeda springs are a 'set' and work as a package, so if they work I'll obviously install the fronts so the 'set' works together as well keeping the drop equal front to back.

If not, then I'll remove the rear progressives and find a set of non-PP springs. Until then, I'll just keep a dead hooker in the trunk.... ;)

I'm confident it will help, let us know once you try our springs just in the rear.

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[mikeyjobu]

When I think of the word "bouncy" a secondary motion is implied -- I hope that's not what the consensus is here -- I didn't feel any of that on my test drive. I felt the bumps and joints in the road surface, but I never felt each one more than once, if that makes sense...

 

[dhardison]

When I think of the word "bouncy" a secondary motion is implied -- I hope that's not what the consensus is here -- I didn't feel any of that on my test drive. I felt the bumps and joints in the road surface, but I never felt each one more than once, if that makes sense...

My EB PP definitely has a secondary motion as a part of the bounce. It's only 'bouncy' on minor road imperfections/surfaces and on those type surfaces I'm bouncing up/down in the seat. Also when my headlights are on I can see them flashing up/down on the cars/signs in front of me as the rear of the car bounces. It feels like the rear shocks don't have control of the spring rebound for the first inch of travel.

 

[Rv-Junke]

+1^^^^^^

 

[mikeyjobu]

How many comments on here refer to the GT PP?

 

[jbailer]

Thanks for this. My ecoboost PP tires were also at 41 psi from the dealer. The sticker inside the door recommends 32. I just lowered mine and will hopefully get a chance to check it out this evening.

Tire pressure may be somewhat obvious, but considering the number of threads mentioning the extremely high tire pressures as delivered from the factory I figured it was worth a post.

After reading a number of other threads stating the tire pressure from the factory is set above the 40psi mark, I decided to check and sure enough all were 41psi on my Mustang. So I dropped them down to 32psi all around and it seems to have reduced the 'bounciness' ~30-40%. The ride is still firm as it should be with the PP suspension but now the daily drive is much nicer and as a result my tire wear should be much more even as well. It's worth a check!

 

[Stangnut]

First off, as you can see in my sig, I've had a Mustang or two, so I know what "stiff" suspension is. The 2015 isn't stiff at all. It's bouncy, plain and simple. It reminds me of riding in a lowered mini-truck with cheap springs like were common in the 80's.

I don't have the PP so I'm wondering if the 20" wheels has something in common with the PP that is causing the bouncing. I say this because with the 20's you also get the same strut tower bracket that comes on the PP cars. Not that I think that's causing it, just wondering what else could be the same.

 

[Rv-Junke]

First off, as you can see in my sig, I've had a Mustang or two, so I know what "stiff" suspension is. The 2015 isn't stiff at all. It's bouncy, plain and simple. It reminds me of riding in a lowered mini-truck with cheap springs like were common in the 80's.

I don't have the PP so I'm wondering if the 20" wheels has something in common with the PP that is causing the bouncing. I say this because with the 20's you also get the same strut tower bracket that comes on the PP cars. Not that I think that's causing it, just wondering what else could be the same.

THANK You...some have confused Bouncy to Stiff...From what it seems its the PP only both Eco and 5.0, I cannot comment on the 20" option. I can say my dead body (170lbs) in the trunk is still working like a champ!

 

[mikeyjobu]

okay -- just so we all understand that the EB PP is essentially a standard GT minus Coyote, plus the EB, plus 3.55 gears. So do we have any non-PP GT owners chiming in -- because it's the same suspension. The GT PP has numerous things to stiffen the chassis, different front springs, different rear dampers -- probably several other pertinent items not listed.

 

[BmacIL]

First off, as you can see in my sig, I've had a Mustang or two, so I know what "stiff" suspension is. The 2015 isn't stiff at all. It's bouncy, plain and simple. It reminds me of riding in a lowered mini-truck with cheap springs like were common in the 80's.

I don't have the PP so I'm wondering if the 20" wheels has something in common with the PP that is causing the bouncing. I say this because with the 20's you also get the same strut tower bracket that comes on the PP cars. Not that I think that's causing it, just wondering what else could be the same.

I added the upper K-brace and strut tower brace on my non-PP car with 18" wheels, and it became less bouncy. The bounciness is mostly coming from the rear end.

 

[mikeyjobu]

I'm wondering as I read this if the mass of the wheels is adversely affecting rear suspension performance? What are the weights of the 20" option versus the EB PP 19" versus the GT PP 19" 9.5 option? I think it has been posted that the GT PP rears weigh 33 pounds?

 

[jbailer]

I saw somewhere that the EB PP wheels (19") are 40 lbs. I don't think this is right though. It was on Ford Racing Parts but it says the same weight for every one I looked at.

I'm wondering as I read this if the mass of the wheels is adversely affecting rear suspension performance? What are the weights of the 20" option versus the EB PP 19" versus the GT PP 19" 9.5 option? I think it has been posted that the GT PP rears weigh 33 pounds?

 

[dhardison]

I added the upper K-brace and strut tower brace on my non-PP car with 18" wheels, and it became less bouncy. The bounciness is mostly coming from the rear end.

I have a set of 235/50/18 Pirelli P-Zero Nero all season tires on non-PP GT 18" wheels that I'll be using for winter wheels/tires. I considered installing these just to see if the 19" PP wheels/Pirelli P-Zeros might have something to do with the bounce (i.e wheel weight and/or shorter tire side-wall). It really feels more like a spring/shock issue to my butt/back though.....

 

[jbailer]

I just got back from going out to dinner. Unfortunately lowering the tire pressure to 32 psi did nothing for my bouncy ride. My wife couldn't tell a difference either. I thought about asking her if she would get in the trunk so I could test out the "body in the trunk" method but figured that wouldn't go over too well. :headbonk:

Thanks for this. My ecoboost PP tires were also at 41 psi from the dealer. The sticker inside the door recommends 32. I just lowered mine and will hopefully get a chance to check it out this evening.

 

[ForTehNguyen]

I saw somewhere that the EB PP wheels (19") are 40 lbs. I don't think this is right though. It was on Ford Racing Parts but it says the same weight for every one I looked at.

the 19" PP wheels are 33# each

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