Art Morrison IRS, 73 Camaro

[David Pozzi]

I don't have the roll center height data but they say it's very stable which is the main consideration, it moves 1:1 with the body.

We are starting from scratch on spring rates and shock valving. The motion ratios are different from the stick axle we had, more like the front now. We are at 450 in spring rate which is what Morrison runs on their 69 Camaro. It works very well, I doubt we will be far from that in a year from now, but time will tell.
We started with an aggressive toe steer setting (toe out in bump) we found that to be too much and backed it down to pretty close to what Morrison runs on their 69 right now. We will experiment further.
I'm not much up to speed on the "numbers" yet, we have been so busy just getting it into the car. I'm not sure my Performance Trends software can even handle this type of suspension. I kinda doubt it.

[mfain]

Originally Posted by David Pozzi

I don't have the roll center height data but they say it's very stable which is the main consideration, it moves 1:1 with the body.

We are starting from scratch on spring rates and shock valving. The motion ratios are different from the stick axle we had, more like the front now. We are at 450 in spring rate which is what Morrison runs on their 69 Camaro. It works very well, I doubt we will be far from that in a year from now, but time will tell.
We started with an aggressive toe steer setting (toe out in bump) we found that to be too much and backed it down to pretty close to what Morrison runs on their 69 right now. We will experiment further.
I'm not much up to speed on the "numbers" yet, we have been so busy just getting it into the car. I'm not sure my Performance Trends software can even handle this type of suspension. I kinda doubt it.

Thanks David. I use Performance Trends for various IRS designs. The data enters like a double a-arm front suspension with X,Y, and Z measurements of the pivot points. It will yield moment center, instant centers, camber gain, and the like. I am anxious to see Mary's car perform in person.

Pappy

[David Pozzi]

Originally Posted by mfain

Thanks David. I use Performance Trends for various IRS designs. The data enters like a double a-arm front suspension with X,Y, and Z measurements of the pivot points. It will yield moment center, instant centers, camber gain, and the like. I am anxious to see Mary's car perform in person.

Pappy

That's encouraging, I have to get all the measurements for it.