rear suspension noise over tar strips

[911monty]

Isn't the purpose to have the rubber in the bushing in a neutral state with the car on it's wheels? Tightening with the wheels unsupported will continuously load the bushing while stationary and really load bushing in compression over bumps causing premature failure?. While a PITA I usually put on ramps before final torque.

[EJ-Fresno]

I agree with you Kram. I am curious about the difference?
I came to the conclusion that they were both the same and ordered some 986 ones...

[flaps10]

Not sure what the exact difference is, but beware that Pelican has a ton of "file photos" on their parts pages. I thought i had gotten the wrong clutch slave cylinder because of it.

On the subject of the track arm i watched the video from EPS about theirs with the urethane bushing. I like some EPS stuff but not that. If you watch him push the thing around you see the arm bending quite a bit. That track arm isn't designed to bend and with a ball in the end it never will. Look up "pin connected structures" in any statics book. Each member is statically determinant (just means a mortal can do the math on all pieces of the free body diagram) because they can only push or pull, exactly the job of a track arm. Counting on that flimsy forging to stiffen the ride is a suckers bet in the long run. I bet some of those will snap off a few inches from that end. That would be "interesting"

I have to agree with Brad Roberts on this one. I'm hoping he will explain the 987 arm better

[KRAM36]

I did not know they were interchangeable when I ordered mine. Normally when they are Porsche supersedes the part number. Maybe it's a build date issue, the 986 numbered track arms have been sitting around longer then the 987 ones? Once they run out of them they supersede the number?

Like if you go to Pelican to order a motor mount, you now get the 987-375-023-05 part number.

[healthservices]

There used to be some aftermarket replacements available with greasable spherical joints at very reasonanle prices here in the states. Wonder what happen to them?

Sent from my SM-T310 using Tapatalk

[healthservices]

here they are!


http://www.ebay.com/itm/Porsche-986-987-Boxster-Boxster-S-97-10-Adjustable-Rear-Track-Arm-Arms-/391099382619?hash=item5b0f56fb5b



Not as cheap as I remembered but I guess it a sign of me getting old...

[WillH]

Originally Posted by healthservices

here they are!


Porsche 986 987 Boxster Boxster s 97 10 Adjustable Rear Track Arm Arms | eBay

Not as cheap as I remembered but I guess it a sign of me getting old...

Has anyone here used these? Care to do a review?

They look heavy.

Is the ball joint free of plastic? Do they have the potential to outlive a stock set.

I'm planning on lowering the car and was looking at their toe control arms. Is there a need for adjustment on the trailing arms?

[san rensho]

Heres the link to the control arm repair procedure.

Boxster Control Arm Repair - 986 Boxster Suspension, Brakes, and Wheels - RennTech.org Community

[healthservices]

Well if it is all metal, It may not be as durable. Once a little play sets in I'm sure you will hear it.

[WillH]

Originally Posted by healthservices

Well if it is all metal, It may not be as durable. Once a little play sets in I'm sure you will hear it.

You're probably right.

Just blown away that a cars trailing arms are shot at 60 000 miles and the hole part has to be replaced. Would rather press in new joints. Seems wasteful.

[healthservices]

That is what is possible with the part I showed. Whether or not the rod end is easily available is something else. May want to contact the manufacturer or the seller to find out.

[Deserion]

And here I thought it was the clamshell making that racket at low-speed on rough surfaces.

[crooster]

Originally Posted by Deserion

And here I thought it was the clamshell making that racket at low-speed on rough surfaces.

Yeah - I have been thinking the same. Now I bet it's the track arms!

[Pdwight]

Clamshell ???

[crooster]

Originally Posted by Pdwight

Clamshell ???

The hard cover over the soft top...

[Pdwight]

Doh !!!!!!!!!!!!!!

[EJ-Fresno]

So one has to tighten the arms with the wheels on?

[911monty]

The car needs to be sitting on all 4 wheels. When you tighten the bolt thru the bushing, the bushing center shaft is held in that position by the bracket. Control arm movement up and down is enabled by the bushing rubber torquing/stretching around that center shaft. When you load the cars suspension before tightening, the rubber bushing is in a neutral/unloaded position. It can then stretch equally in both directions as the suspension compresses or rebounds. If you tighten without loading the suspension then once the car is on the ground the rubber bushing must stretch as the arm is compressed upward. This has the bushing loaded 100% of the time. When you hit a bump and the suspension compresses, the bushing must stretch even further than designed. The only time the bushing is relaxed is when the car leaves the pavement and is flying. Hope This makes sense.

[WillH]

From my understanding it was a bushing until '99 when they changed to ball. The manual also states that the old type are no longer being manufactured. I guess the vertex re-bush ones would count for those.
I can't see the ball being loaded or unloaded as it can be moved by hand. So I guess I'm saying that this doesn't make sense to me.

Edit.
Might make more sense for the trailing arm at the control arm, though not too sure about that either.

[WillH]

I'm guessing now that the manual is referring to the coffin arm/control arm as it makes no sense for the trailing arm/control arm.
Looking forward to noise free ride to work