Rear trailing arm mount

[r_towle]

Does anyone know the correct angle that the torsion bar trailing arm bracket it mounted?

I found that on a VW it’s 15 degrees.

[HarryD]

Originally Posted by r_towle

Does anyone know the correct angle that the torsion bar trailing arm bracket it mounted?

I found that on a VW it’s 15 degrees.

The angle determines ride height. This tool may be helpful. https://www.elephantracing.com/tech-topics/spring-plate-angle-calculator/

[r_towle]

I may have phrased the question poorly.

The mounts welded onto the torsion tube in the rear that the two banana trailing arms bolt to.
Each arm is bolted with a single bolt.
These are the arms that have the hub and wheel mounted to (and the trailing arm/spring plate)

I am hoping to find an answer to the angle that the brackets are welded on to the torsion tube.

[HarryD]

Originally Posted by r_towle

I may have phrased the question poorly.

The mounts welded onto the torsion tube in the rear that the two banana trailing arms bolt to.
Each arm is bolted with a single bolt.
These are the arms that have the hub and wheel mounted to (and the trailing arm/spring plate)

I am hoping to find an answer to the angle that the brackets are welded on to the torsion tube.

This picture from a thread by Rothaus (https://forums.pelicanparts.com/porsche-911-technical-forum/1099657-rear-banana-arm-clearance.html) may be helpful.

[gled49]

My guess would be 0*. Turbo’s with the short trailing arms says the torsion tube is rotated up 1* I think, not at my manuals now. The pickup points are longer by 50mm as the arms are shorter, so complete different parts there. Non Turbo= Bolt centerline same as torsion tube centerline, 0 degrees.

[Tyson Schmidt]

I think he’s talking about the angle in plan-view.

So at what angle the trailing arm pickup point is mount rearward compared to the sprinplate pivot centerline.

From memory, it’s in the 12 degree range for 911.
Probably in the 16-18 degree range for RSR/930, but that’s just a guess.

[r_towle]

I’m wondering (and planning) to setup the trailing arm on a table to jig this out and find out.
I assumed it would be in a shop manual somewhere but all I found was (I don’t have shop manuals) a picture of how to check that the mounts are not bent.

[HarryD]

What year car?

Please add your car to your signature.

[r_towle]

I have too many Porsches
This is a custom project I need to get this angle…

Rich