On Alfa number 15
AO Platinum Member
Join Date: Dec 2005
Location: United Kingdom
The Spider does corner in a similar fashion to the GTV, just it feels softer.
A strut brace may help, but they only keep the strut tops locked together, and the steering geometry more constant. The Spider flexes along its whole length not just at the suspension mountings.
Top Gear (old top gear) came up with a great anaolgy. Imagine a shoe box with a lid. It is nice and rigid, and cannot be twisted.
However, remove the lid and it will twist a lot more easily, and that is very difficult to eradicate, unless a car is designed as a soft-top from the very beginning.
Like I said before though, the Spider flex is not as bad as some magazine testers at the time would have you believe, but it is noticeable on a rough road. Especially compared to a Maxda MX-5, Honda S2000 etc which were designed as a soft top from the outset.
You will never be cool driving a Vauxhall.