anyone tracknig with stock trailing arms?

martin82

At about 8-9K miles, this is what happened to my trailing arm bushings.

What are my choices for aftermarket:
SPL: very expensive lol
Kinetix: uses polybushings

Anything else out there?

Dwnshift

Actually we are as we are not allowed as of yet to change those arms.
Those bushings need to either be a delrin spherical or alum spherical
... Or the OEM rubber bushing.
Dwnshift

martin82

did you press in poly bushings in there? I have about 13K miles now, about 14-15 track days...

I know on my infiniti qx4 I had the same problem, the stock bushings were crap.... had to press in all new poly.

Dwnshift

Nope
Unfortunately we have to run that OEM arm as is.
We would like to change it out ... Are not allowed to at the moment.
That particular bushing needs to be free and have movement in an arch... So a straight poly bushing will bind the rear arm as is goes through its motion.... It's not just straight up and down... It twists ... Which is exactly why the rubber rips.
Dwnshift

martin82

my only option at the moment are these:
For about $100-150


or $300 for SPL

Dwnshift

Get the SPL ones or another set of OEM.
The SPL are fairly heavy but the spherical on the end will not bind.
The reason the arms are expensive is that spherical on the end..... They are not cheap.
A striaght bushing such as shown in the other arms will bind as it travels through its motion.
If we get arms approved we will design our own version but until then.....
Dwnshift

martin82

Thanks for the reply! I just wonder how these will feel as I DD the car and drive to and from the track...

Shamu

My car has all SPL in rear. No difference in feel. And I'd say they aren't that heavy either as indicated by other post. They are very close to stock weight but are far more beefy and well made.

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ChrisSlicks

I have the SPL pieces as well, no issues.

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Mike

This all had me worried, so I checked mine when swapping tires for this weekends event today.

19000 miles, at least 14000 on track, and the OEM are holding up just fine.

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martin82

Wow wtf is wrong with my car then

wstar

Nothing probably, just conditions vary a lot. More time parked outside? Bushing got more water exposure over time? More heat? Different tire/suspension/alignment config putting different stresses on it?

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Dwnshift

If you are using them... They will rip eventually.

cossie1600

You can always say that you are driving faster than everyone else, resulting in faster wear....

TopElement

Kinetix don't allow free range of motion.
SPL are not expensive and have a smooth spherical bearing, I just wish the "fork" was a little beefier. Not sure why they are double adjustable either, when the rod end could just use a single lock nut and fine adjustments made with the stock bolts.

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