Ralph,
Struggling with your dropbox files but it seems that individual rear suspension parts aside - hub carriers and hubs, control arms, ARB, driveshafts, etc. unique to the GT4 - the biggest difference appears to be in the additional stiffeners running side-to-side behind the ARB and at the leading edge of the triangular shaped bracket on the underside. These mods appear to be aimed at distributing the transverse suspension loads more effectively across the rear end of the car to the body pick-up locations to minimise local body distortion.
The inverted rear struts are stiffer in bending and are therefore more resistant to buckling loads and with this in mind, I note that additional body stiffening has been incorporated at the top mount location by the use of (glued and riveted?) steel plates.
Presumably Weissach felt the need to incorporated these stiffening mods bearing in mind the intended use of the car for multiple track days.
Just my take on it of course.
Jeff
Struggling with your dropbox files but it seems that individual rear suspension parts aside - hub carriers and hubs, control arms, ARB, driveshafts, etc. unique to the GT4 - the biggest difference appears to be in the additional stiffeners running side-to-side behind the ARB and at the leading edge of the triangular shaped bracket on the underside. These mods appear to be aimed at distributing the transverse suspension loads more effectively across the rear end of the car to the body pick-up locations to minimise local body distortion.
The inverted rear struts are stiffer in bending and are therefore more resistant to buckling loads and with this in mind, I note that additional body stiffening has been incorporated at the top mount location by the use of (glued and riveted?) steel plates.
Presumably Weissach felt the need to incorporated these stiffening mods bearing in mind the intended use of the car for multiple track days.
Just my take on it of course.
Jeff