Using a 20MM Q45a swaybar and the Base Q45 29MM swaybar together Question.

[Infinitiguy19]

I want to get the 20MM Q45a rear sway bar but I don't want to buy the 28MM swaybar off a Q45a or Q45t because its only 1MM thinner.

So could I use both my factory installed 29MM and 20MM swaybar together without any dangerious side effects such as understeer?

Or can I just use Polyurathane bushings in the rear bar to sort of equal out the effects?

By the way after reading this:

"By the way some of my driving bent the bar an 3/4" permanently part of the reason why the rear subframe needed replacement. "

Is the Q45a rear swaybar worth the risk?

But:

"If you don’t have access to it easily, its not worth the upgrade to the 28mm bar. Making the front bar smaller is in essence making the rear bar stiffer. "

If I lose some stiffness in the rear because of the above, well I can live with that.

Source: http://q45.org/swaybar.html
Modified by Paul Wall at 1:39 AM 7/10/2009

[Q45tech]

The difference is only 6.5% EFFECTIVE which might result in a 1% difference in handling GAIN less than 0.01G.

When the engineers designed the active they had a clean slate so their selection of front and rear bars was optimum for factors we cannot imagine.

Remember above 0.55G the active is frozen dynamically and the Q depends on springs and shocks to achieve the ultimate limit. [set by tires and body weight].The major problem is the selected aftermarket tires may not be up to or follow oem designs.

If we reverse engineered the spring stiffness to emulate the active system added stiffness [zero body roll statically at 0.45 g] when a standard springed Q would have rolled 1.75-2.0"..............you are looking at some really stiff springs, bars and combination.

Doubling spring stiffness only halves the roll in inches, but can knock your fillings out on bumps. Where would we find shocks to match such stiff springs.

Always remember every passenger vehicle has way too stiff front sway bars as it comes from factory to protect untrained naive drivers from themselves especially in wet weather.