The Problem:

While I think Infiniti did a good job of juggling the sporting versus luxury quotient overall on the G35 Sedan, I tend more towards the sporting side so I've been upgrading the brakes, exhaust, etc. already (see my car profile for details). However, after some racing at Road America and especially Gingerman Raceway, it became obvious that I needed to improve the handling a bit as well.

At the limit my G35 (with the new tires) sticks quite well, but also rolls a fair amount. At high speeds this roll means that the outside tires are also rolling, taking a lot of punishment while the insides loaf. You can see the difference here between myself and Damian's 330Ci at Gingerman:

Rick's G35

Damian's 330Ci

You can see that Damian's 330Ci has slightly less body roll, reducing some of the burden on the outer tire and better utilizing the inner one of each pair.

The Solution:

There are more than one ways than one to skin a cat, or improve you car's handling. One would be to replace the struts with firmer versions that would damp out and equalize cornering forces better. This also typically degrades the ride and is expen$ive ($800-1600). Different springs will also change how the car handles pitching and rolling, and reduce the height and therefore the center of gravity. This also makes for a choppy ride and results in a lot of grinding over bumps.

Or, the most direct and cheap way, is to upgrade the anti-roll bars on the car. This will help side-to-side rolling, but not front/back or damping, which means the ride is nearly 100% unaffected. I purchased a set of Stillen anti-roll (sway) bars and installed them myself, as you can see in the pictures below:

Stock and new bars	Stock and new bars
Front bars installed	Front bars installed	Front bars installed
Stock and new bars	Stock and new bars
Rear bars installed	Rear bars installed	Rear bars installed

The bars are three-way adjustable (technically six-way), and are currently set to be about 35-40% more stiff than stock. Setting them any more aggressive usually means you wear out other suspension bits like the end links that are connected to them. Still, the body roll is reduced and that should improve the cornering as well.

We'll just have to wait until the next track event! :)