Early_S_Man, I'm sure you have more experiance with 911 (semi) trailing arms than I do, however:
I've studied the construction of 944 front and rear steel vs. aluminum control arms...
The aluminum arms flex MUCH less, they weight significantly less. (keep in mind these rear semi-trailing arms are quite similar to the 911 units)
Also, I've never had them on scale, but the aluminum 911 semi-trailing arms weigh MUCH less than the steel ones. Significantly less? I think so, but that's objectional.
Also, aluminum arms are more expensive to manufacture (in the 944s case), and the steel arms are pressed by machines!
Ahmet
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It's all the driver...
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