Performance Pack suspension bouncy?

[OzS550]

The Steeda progressive springs have improved the ride quality a ton. This includes the bounciness that would happen while 100% stock.

Todd, I'm confused. Are your Steeda springs progressive or linear? Your build thread links to Steeda's linear springs.

I'm trying to decide myself between the two options.

Thanks.

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[Norm Peterson]

In general, progressives give a slightly better ride while linear rate springs are preferred for serious cornering/handling.

There is this one other caveat. Among "progressive" springs, there are true progressives (whose rates do gradually vary as they are compressed) and what are actually dual-rate springs (that suddenly flip between their soft and firm rates over very short distances as the spaces between the closely spaced coils all open and close up at essentially the same time).


Norm

 

[Rv-Junke]

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:

Mine is still in the trunk, I feed her a little each day to maintain the 170 lbs.

 

[Todd15Fastback]

Todd, I'm confused. Are your Steeda springs progressive or linear? Your build thread links to Steeda's linear springs.

I'm trying to decide myself between the two options.

Thanks.

They're progressive.

I'll update my build thread

 

[Todd15Fastback]

Mine is still in the trunk, I feed her a little each day to maintain the 170 lbs.

:lol::lol::lol::lol:

 

[NVPony]

Mine is still in the trunk, I feed her a little each day to maintain the 170 lbs.

If you want to see who loves you the most, your Dog or your Wife, lock them both in the truck for 2 hours and see who is happy to see you when you open it.

 

[Rv-Junke]

If you want to see who loves you the most, your Dog or your Wife, lock them both in the truck for 2 hours and see who is happy to see you when you open it.

:lol:....OK, morning jokes over...I am going back to dealer today with 170lb in trunk and taking SM for a ride, then I will remove...let's see if I can get Ford to budge on this a little...

 

[RobBaker]

I've read thru this thread and I'm in 100% agreement that my 2015 Ecoboost PP is bouncy. I've been around cars (age 65) for a while I have a FFR Cobra and a 2008 Miata. Neither of my other two cars have this bounce to them. I do love my Mustang but the suspension is a flaw.

 

[transitmaster]

I've read thru this thread and I'm in 100% agreement that my 2015 Ecoboost PP is bouncy. I've been around cars (age 65) for a while I have a FFR Cobra and a 2008 Miata. Neither of my other two cars have this bounce to them. I do love my Mustang but the suspension is a flaw.

Same model as you and I tend to agree. It really stands out to me on long stretches of relatively smooth highway, which we have in abundance here in TX.

 

[ForTehNguyen]

I test drove a GT PP today and I even checked the tire pressure which was 41 psi. Didnt seem bouncy to me.

 

[Rv-Junke]

I test drove a GT PP today and I even checked the tire pressure which was 41 psi. Didnt seem bouncy to me.

I'm wondering if they have made changes already...

 

[RobBaker]

My theory is if you drive without any shocks you get a bouncy ride because your only running with the springs. If you have shocks that can't handle the compression of the heavier duty spring (PP) then the shock is the weak point.

Does anyone know of vendors with a better shock that can handle to load of these springs. Next week I'm going under the car to take some measurements.

Ford do you agree if your reading this thread?

 

[Rv-Junke]

My theory is if you drive without any shocks you get a bouncy ride because your only running with the springs. If you have shocks that can't handle the compression of the heavier duty spring (PP) then the shock is the weak point.

Does anyone know of vendors with a better shock that can handle to load of these springs. Next week I'm going under the car to take some measurements.

Ford do you agree if your reading this thread?

I am no engineer, but what you are saying feels correct, thus compressing the spring with weight in the trunk allows the shock to do its job. Lowering springs in essence do this as well takes the top part of the spring out of the equation. I have not found shocks yet other than BMR has Vicking, and the Ford Racing Handling Pack has all new coils and shocks as well as sway bar and other goodies. I am seriously leaning that way, just debating if I want to try and tackle the job of the install myself or not. It's really pissing me off I need to spend money on this, or I ratchet up the fight and flip the car back on lemon law.

 

[Norm Peterson]

I rather doubt that the PP shocks and/or struts are position-sensitive (damping that varies with ride height as well as with its piston speed - think "suspension speed", relatively slow in roll, squat, and brake dive but much faster when you hit a sharp bump).

What adding weight at just the rear does is slow down the rear suspension's natural frequency, and having the front and rear suspension frequencies in the proper relationship to each other does affect ride quality. Poorly chosen, it might feel like you're riding in an old pickup truck with nothing in the bed, were you get a lot of nose-up/tail-down and vice versa motion of the truck as a whole and front-to-back head-toss for you in particular.

If only the rear shocks aren't up to snuff you won't get as much head toss, but the rear suspension may feel like it'll never stop moving even though the front feels 'settled'. Anybody who has ever changed only the front shocks on a car knows how this feels.

This could be a little of both . . .


Norm

 

[VNMOUS1]

Mine feels like a 911 compared to my 07 GT500

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