[Ron Sutton]

Originally Posted by SSLance

Sure thing Ron, the current front sway bar is from an F-body 36 mm dia, 0.220" wall tubing.

The new Ridetech MuscleBar will be 1.5" dia (38.1 mm) and 0.250" wall tubing.

I'm running a 1" solid rear bar and 162 pound springs.

Okie Dokie Lance ...

When I worked up your current suspension package, we decided to run it a tick on the free side so there was no push (unless you turn in & apex too early).

For those following along with us, TRS (Total Roll Stiffness) is an accurate calculation that takes into account front & rear track width, roll centers, CG, spring rates & sway bar rates to provide a total roll resistance number.

The TRS number ONLY tells us the car's average roll angle at specific G-force numbers ... not front & rear roll angles. That's where the FLLD & RLLD percentages come in. These acronyms stand for Front & Rear Lateral Load Distribution. That's an engineering term for how are we splitting up this roll resistance front & rear ... stated in a percentage. We need more roll in the rear than the front for neutral/balanced handling.

We worked out your current FLLD as 54.0% FLLD & 46.0% RLLD. That's with:
Front Springs: 600#
Front Sway Bar: 36mm x .220" wall
Rear Springs: 162#
Rear Sway Bar: 1" Solid

If you just changed to the XHD Ridetech Muscle Bar with no rear changes, the 1.5" x .250" wall sway bar alone would change your FLLD/RLLD to 56.6%/43.4% and tighten the car up. You'd have more rear grip and when the track is really grippy from proper temp & good rubber laid down, it would be tight. Tight means harder to turn, but not pushing ... but borderline. That would be ok for road courses ... as long as you run big sweeping corners with wide entry & exit lines ... but it wouldn't like tight corners & it certainly wouldn't autocross well at all.

So you'll want to change the rear springs at the same time you change the bar. Ridetech sells the rear springs you need, so I suggest you get them with your new sway bar. You'll need 250# rear springs.

So with ...
Front Springs: 600# (Same)
Front Sway Bar: 1.5" OD x .250" wall (Custom XHD Muscle Bar)
Rear Springs: 250# (New)
Rear Sway Bar: 1" Solid (Same)

Your new FLLD/RLLD will be 53.9%/ 46.1% ... within .1% of your previous set-up. But of course the whole car will run flatter ... less roll angle ... and work the inside tires better.