Quote:
Originally Posted by chrisbalich
Looks like the entire TB tube between the banana arm mounts is removed.
I don't see any reinforcements...at least not in this picture.
And that will be a lot of work to seal up for a street car. *Even though I exclusively associate winders with racing.
I'd also like to see some more pictures of the 'finished' chassis/tub modifications.
I'm also worried about what this would do to the tub's rigidity wihout a full cage.
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You are correct, the tube must be completely removed in that section! This is similar to how all of Porsches period race cars were modified like the 935s.
The control arm inner mount side of the bracket was removed and a new thicker piece of steel welded on in its place. The new parts are boxed onto the cut tube and to the opening cut into the sheet metal between the rear seat hump.
The lower control arm "banana arm" forward mount does significantly less work on a car with coilovers, so I'm not too concerned. I've considered making a hoop of cage tubing over the top of the control arm mounts but it's probably overkill.
As a bit of a test I supported the weight of the car on the control arm bracket after welding and measured zero deflection.
My car does have a rear bolt in cage and all, but seems to drive great, if anything feeling more ridged than before.
If you look at the 964 models and some of the race cars in detail, you can also see that mounting point or it's equivalent is pretty basic, it's now just where the arm swings from vs heavy load control.