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Old 08-16-2010, 05:49 PM
ibid ibid is offline
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Default You know you are hard on your equipment when this happens......

Well, I had promised Andy we would be tracking the crap out of the car and putting tons of track miles (and we did and continue to do so) but after 60+ track days, 24k miles later, the rather unique setup in front of the p10 with that 3rd link took its toll on the AMR suspension. Andy said he's never seen anyone do this to his suspension in his entire career (go figure we manage to do this huh?) Anyway, I'm more thankful than ever that Andy stood behind his lifetime parts replacement warranty because we just installed the brand new replacements so we are ready to go another track day.

The bent ones are going back to Andy (as per warranty requirement) so he can test/study them accordingly.


Anyway, here are some fun photos of what happened in our case!

(Keep in mind we had used our own offset delrin upper control arm bushings --- offset to give us some negative camber in front)










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Old 08-17-2010, 06:48 AM
Matt93SE Matt93SE is offline
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DOH!!!
you need to remove the rubber up top and put a spherical in there. (unless there's one hiding under the rubber...)
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Old 08-17-2010, 07:34 AM
e1_griego e1_griego is online now
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That's because Andy is full of it and AMR is a joke.
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Old 08-17-2010, 07:49 AM
cdlong cdlong is offline
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What's the setup? Since you did the same thing to both sides, it seems more likely there's a design flaw.
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Old 08-17-2010, 04:18 PM
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That's not the first time some cheap Chinese/Taiwanese damper shaft has bent from normal suspension loads, won't be the last...
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  #6  
Old 08-17-2010, 07:54 PM
mmdb mmdb is offline
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Dayam... That's pretty amazing considering the rear is a multi link meaning the load is shared with the rear upper camber arms, lower, arm, etc. Guess you got your usage out of 'em though!
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Old 08-18-2010, 09:03 AM
Matt93SE Matt93SE is offline
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the big issue I see- and it's just a guess from those pics- is that there's no upper spring perch/spherical bearing etc to allow the spring to pivot at the top of the assembly. It appears the spring is just sitting on the upper mount, which puts a ton of bending force on the shock assembly as the suspension goes through its range of motion and the bottom of the shock travels in an arc.

with no pivot up top, there's no chance in those shocks lasting terribly long.

Ran into that years ago when a "privateer" tried to design some camber plates for the Maxima. he didn't put any sort of pivot at the top and the threaded portion at the top of the strut actually fatigued and snapped off while the guy was driving. modify for sphericals and the problem went away.
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Old 08-18-2010, 10:14 AM
AceInHole AceInHole is offline
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It looks like there's a rubber bushing up top similar to the stock mount to allow for some articulation, although it appears that it wasn't flexible enough.
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Old 08-18-2010, 10:49 AM
cdlong cdlong is offline
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But the top of the spring still sits flat on the plate. It needs to stay parallel to the shock, which isn't always perpendicular to the upper mounting plate. Even if the rubber bushing was soft enough (or had a spherical) the spring would still introduce bending loads on the shaft. Add a proper perch and you'd be all set. Though it looks like you'd lose some travel since you can't move the lower perch down to compensate for the additional spacing up top.
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Old 08-18-2010, 11:42 AM
Matt93SE Matt93SE is offline
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What he said.

being able to pivot the strut shaft is one thing, but you gotta have the spring pivot with it.
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