This one gets a lot of interest, so here’s some ‘splaining. This is a Roadster Shop chassis equipped 67 Chevelle. At ride height, the instant center was 62” behind the centerline of the rear axle.
The instant center was BEHIND THE CAR.
No ride height adjustment would fix this.
This resulted in hard lifting under braking (like scrape the front bumper on brake apply) and heavy squatting under acceleration with zero traction at only 380 rear wheel horsepower and an automatic.
So we made new axle brackets that put the instant center where it should be in relation to the center of gravity and weight distribution of the car for the power output. The result? Perfectly flat under emergency braking, about .250” of lift on acceleration. Oh, and confidence and repeatability behind the wheel, with all the traction Michelin Pilot Super Sports can muster.
Also, we only use bayonet style coilovers anymore. We can tune the high frequency ride quality and control using different durometer bushings. Call for more info, we stamp stainless washers and have bushing durometers scienced out for different applications.
Even big builders don’t understand where and why suspension points go where they go. Wanna go fast? Have a ride quality that is as good or better than modern OE vehicles? Need safety, reliability and repeatability? Call, text or email the folks that can get you there, here at ACME. We also tune EVERY spring and shock for each application.
It’s all about ride quality
