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Upper Rear Shock Mounts - Broke 'em both

modernbeat

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This is very easy to test. Remove the rear spring, disconnect the swaybar and cycle the suspension through it's movement both with and without a wheel and tire.

We do this with every suspension we work with both to check and see if there are any issues with lengths and strokes, and also to see if we can improve on it by correcting the mounting height either in the adapters or in the camber plate or spherical mount.

Here I am working on the Subaru we took to Pikes peak checking bump, droop and tire clearance.








And if you follow our builds you will almost always see a photo of something like this, a car with a fully installed strut minus the spring. In this case they were prototype MCS suspension for the S550. I made a prototype set of camber plates for them during the install. We gave MCS some feedback to gain some stroke and some bump travel, and also some small detail items (that they were already aware of) that would make their struts easier to install and more compatible with the stock parts.



This alerts us to any issues with parts, so we know about lowering limits, mounting issues, what else has to be done to get the maximum out of the parts (moving lines, adding camber, relocating bump stops) or what the ride height sweet spot for the parts is, and what we can do to get it further up or down without giving up all the bump or droop travel. It tells us which parts are hopeless, without redemption. And which parts are appropriate for different purposes. They guy daily driving in Rhode Island shouldn't get the same parts recommended to him that a guy with a track-only car in Arizona gets.

Of course this involves some work. We actually have to get hold of the model car we are working on. We get to put the suspension on and off a few times, and assemble and disassemble the parts a few times. We have to take some measurements and know what they mean. And we get to keep track of all those measurements, forever, so when things change, or new combinations of parts come up we don't have to do the experiments all over again. But after you do it a few times it's easier.

Jason, that is very possible.

The body of the Viking is lower than the OEM piece, however they use an adapter up top to mount to the oem USM...
The body may be lower, but if the shock bottoms out internally before the body hits the mount, which is what I expect happened, then it will push the plastic bushing right out the top of the mount.
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BMR Tech

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Yes, we've been doing it for 20 years.

This particular situation, I sent them some oem shocks right when they were available from Ford. They sent me a bunch of prototype pieces and I also worked with them on a coilover kit (that I used for a few months)

The prototypes did not have the new upper piece they use on the production pieces.

With our pieces we tested initially, we had plenty of travel. Off the top of my head, I am pretty sure we had about 1.2" more compression travel than the oem pieces.

On that note, the PP shocks actually have less travel than the base model shocks for whatever reason. I've got a bunch of great data on the oem stuff, and it's interesting the differences of the base and PP versions, both valving and physically.

The moral of the story is, I'm going to address any issues that may be present with travel.

Luckily we have companies like Viking that are willing and able to quickly cater to their customer base.
 

Grimace427

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Here are some photos of the upper mount in case anyone was curious. Just did a Viking install on another member's 2015.


 

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Is there a bushing or rubber O ring in the Mount? I ask because when I go to install my new shocks and springs I was planning on powder coating the upper mount. I do my own powder coating and thought I would color match it to my springs and sway bar.
 

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BackinBlackS550

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Is there a bushing or rubber O ring in the Mount? I ask because when I go to install my new shocks and springs I was planning on powder coating the upper mount. I do my own powder coating and thought I would color match it to my springs and sway bar.
There is a rubber isolator sandwiched between the aluminum. You can see pics of it in my earlier posts of the broken mounts.
 

Project Whitemare

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Just broke mine last night.

Bottomed out at around 20mph. Really hard hit! Instantly broke the mount.

Already got a set on order here at work, with all new hardware.

I'll be first in line for an aftermarket replacement.

Pays off to work at Ford, but man what a bummer. Car is parked until I get the parts in.

How will I make lemonade out of these lemons, I think I will be dipping my wheels to add some temporary color while the car sits on jack stands.
 

Jmeo

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Just broke mine last night.

Bottomed out at around 20mph. Really hard hit! Instantly broke the mount.

Already got a set on order here at work, with all new hardware.

I'll be first in line for an aftermarket replacement.

Pays off to work at Ford, but man what a bummer. Car is parked until I get the parts in.

How will I make lemonade out of these lemons, I think I will be dipping my wheels to add some temporary color while the car sits on jack stands.


Wicked bummer :(


Were you using Viking shocks or OEM?
 

Jmeo

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Hes on air ride if i recall correctly.

Oh, I think it's looking like an aftermarket upper shock mount is getting pretty important. The two cases I have heard of were not using OEM shocks.
 

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mustang_guy

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I dont get how frpp gets away with their upgrade shocks and springs not breaking it. How did they not come across that during testing? I get the impression they do a nice bit of testing before putting stuff on the market. Maybe they dont. Hell. :shrug:
 

5.0 Probie

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Just wanted to say thank you to those finding the weak points in these S550's. Every vehicle has them. By the time our 2016 gets here it seems most of these little gems will be in aftermarket and ordered by yours truly!
 

DickR

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I dont get how frpp gets away with their upgrade shocks and springs not breaking it. How did they not come across that during testing? I get the impression they do a nice bit of testing before putting stuff on the market. Maybe they dont. Hell. :shrug:
Note the upper rear shock mount used for the Shelby GT350 MagneRide rear shocks in the attached screen capture from the video posted a few days ago.



New 2015 GT mount for reference. Note how similar it looks to the Shelby mount. It appears to be identical except the Shelby mount has a bracket for the cable.



Except for the bracket for the control/power cable the mounts look identical.

I'm sure Ford has tested the mount extensively with any shock/spring/bump stop combination that Ford sells.
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