A strut bar is basically a method of stiffening up the chassis by placing a bar between the points where the struts attach to the body. A sway bar, on the other hand, is a bar that attaches to the moving parts of the suspension to lower the amount of body roll you feel when you corner.
A strut bar won't do a whole lot unless other parts of your suspension are stiffened up already (i.e. springs, shocks, sway bars)
I've had experience tuning these components, only it was on 1/10th scale.
Thicker Sway bar = less body roll left/right. Too thick and it reduces suspension movement to a point that you'll lose some traction.
Strut Brace = more structural rigidity or less chassis flex. Too much of this too can be a bad thing depending on the application. You are essentially forcing the springs/shock setup to function as the sole suspension the more braces you put on. This may not be desirable in some cases since chassis flex acts as a form of suspension. Sometimes the shocks & springs were tuned to account for the chassis flex and this could be thrown off... (Maybe not in our car though)
I'm just saying: "Strict segregation of function is not necessarily the best setup."
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