12:05 Garage- ’70 Duster build

racerjoe said
It is bottoming out and it was before I even put this setup on the car. If you look close at the second picture, my inside rear is slightly off the ground. Ths only happens on high speed sharp turns. Denny supplies a 1" solid sway bar, the Hotchkis bar I used to run was 1.5" hollow. Using the Addco online sway bar stiffness calculator, there's a significant stiffness difference between the two. A member here, @bjkadron volunteered to help me do some mathing once I get him some weights for him. I'm going to make a splined end tubing type sway bar and I want to make sure I pick the right size tubing. Had he not volunteered, I would have just gone with the same size tubing the Hotchkis bar has, 1.5" x .188" wall. I may end up with that, but at least I'll have some math behind it instead of just guessing.

Interesting! Are you still running the 450 lb/in springs up front? I know I bought a set of 1.18's for my Duster, even on the street once I started running the Falken Azeni 615K's I was able to bring back some body roll that wasn't there when I was running the harder KDW2's. Your wheel rate at 300 lb/in may still be a bit light.

The NASCAR style splined sway bar is probably the way to go for competition, you could even get a couple different wall thicknesses if you wanted once you get the construction figured out for the car. Some of the kit cars had a similar set up with the splined sway bar. Definitely interested in what you end up doing, I've considered going that direction myself but the Hellwig's I run are just fine for the street for now. The '73+ K frame and the bar running through the K makes a straight splined bar a little entertaining to set up. Speedway sells some splined sway bar kits, they may have something that's in the ball park to start working from