Trailing arm

[911S PORSCHE]

Hello everyone, I have off set problem with my car and don't know what the problem could be, i added SC flairs both sides but the left side i know for sure its not the problem because i added the whole left quarter but on the right side just the flair, now to make it more complicated i have 2 different trailing arm left side is from a more modern car and the right is from an old car but both are aluminum, now if i match the trailing arm do you think i'll solve the problem?? Thanks
does the trailing arm make the wheel goes in or out ???

[911pcars]

Aluminum trailing arm geometry is the same, early or late version. Sway bar drop link attachments are different (ball vs. threaded hole).

A couple of possibilities:

• One trailing arm is bent (you would have other symptoms as well)
• SC flares not installed symmetrically. Can you measure and compare distance to flare from some reference point (e.g. inner fender?).

Sherwood

[AlfonsoR]

Another measurement that might be helpful is from one of the locations on the end of the trailing arm (for example, near shock mounting point) measure to a known center reference point, such as the center of the driveling, for example transmission or engine casing. Do a several measurements carefully with a tape measure, and compare left side to right side. You should be able to determine if you have an offset due to bent or different trailing arms.

Why are the trailing arms different? Is it possible that one of these trailing arms is from a car that was involved in a collision? Kinda drawing a blank, not sure how they can be so different and you don't have any other problems?? This should show up as uneven wear on your tires, but you don't make any mention of this.

Maybe there is a problem in stack up height, installation of rotor, different rotor?

[911S PORSCHE]

Thanks for the impute I was going to buy another trailing but now i don't know if i should but thanks anyway

[AlfonsoR]

To be more clear, what I am proposing is that you take a diagonal measurement and compare left to right to determine if the trailing arm is plumb (perpendicular) to the drive center line. This assumes that your engine and transmission mounts are good and that your drive train is perpendicular to the rear suspension. I've never taken this type of measurement before, but I would think that the drive-train should be reasonably perpendicular. And by the difference you're indicating in the photos, the diagonal measurement should be sufficient to conclude whether or not you have a significant difference in the trailing arm.

So let me see if I can do a caveman drawing..

..........o trailing edge of right side trailing arm
............\
.............\
------------o mid-point of engine or nearby easily referenced point on the engine case flange
............../
............/
..........o trailing edge of left side trailing arm

The "o" is an easily reference point on the trailing arms and on the engine. The "\" and the "/" indicates tape measure. Does that make sense?

[911S PORSCHE]

wow you guys are very good thanks.

[feelyx]

Check the offset on your rims, you might have 2 different ones.
Tim

[911S PORSCHE]

Yes the car was involved in an accident but i changed the broken trailing arm (right ) now I am thinking the left could be bent too?? The SC flair i don't think is 100% symmetric but the difference is not too big, the flairs maybe is off by less than 5 mm, I not sure. I am going to take the measurements just to by sure, but thanks very much for you help!!!

[Jon B]

Have the rear wheel cambers and toe been checked? That would certainly indicate whether the problem is in your trailing arms. There are factory tools to check rear trailing arms for deformation...

[Flieger]

The Aluminum arms generally crack or break with impact rather than bending. The steel will bend.

[911S PORSCHE]

This tread has helped me a lot thanks for all the help.
How accurate is the measurements of this poster. I got this from The-blueprints.com, and i was doing another research about the offset of the wheels, they say 16X7 the offset is 23.3 the only offset it was made???