Rear torsion bar position question

[moneymanager]

Have read deeply here about torsion bar settings but am still confused about one point. If
I like my ride height where it is, and I switch from a 23mm torsion bar to a 27mm bar, do I want to get the trailing arm angle as it was before the swap or somewhere different? Car is a 74. Thanks,

[Zeke]

Use this calculator.

[moneymanager]

Thanks Milt. I infer from the calculator that the angle is going to be different. Actually, reading his technical explanation makes it all pretty clear. Thanks again,

[DanS911]

What Milt says.......in other words it WILL be different

[Zeke]

Yep, setting the ride height by using the droop angle makes it different. In the end, the spring plate will be at the same angle with the car on the ground. Confusing.

[moneymanager]

So just to be completely clear, the droop angle I seek will be different with the new bar when the suspension is off the ground, but it will be the same as it was earlier when the car is on the ground bearing weight (and the body is in the same position relative to the wheel as it was when I started)?

[tyro]

Right.

As long as ride height stays the same, droop angle will be less as a bigger bar will twist less.

(in my experience with the bars on a 944)

[moneymanager]

Makes sense. Many thanks all.