370Z Motion Ratios

Brendan · 08-01-2019, 06:40 PM

That article is wrong. Motion ratio is about where the control arm has leverage over the spring. Where the strut attaches has nothing to do with it in a divorced setup like what is on the 370. The front is .65 and the rear is .55. This is from my independent measurements and I found it elsewhere as well.

edit: .55 rear motion ration if you are still divorced spring. if you are true type then it is in fact 1:1 (like a .98 or something if you want to get really particular)

gomer_110 · 08-01-2019, 07:03 PM

Quote:

Originally Posted by Brendan

That article is wrong. Motion ratio is about where the control arm has leverage over the spring. Where the strut attaches has nothing to do with it in a divorced setup like what is on the 370. The front is .65 and the rear is .55. This is from my independent measurements and I found it elsewhere as well.

edit: .55 rear motion ration if you are still divorced spring. if you are true type then it is in fact 1:1 (like a .98 or something if you want to get really particular)

@OP, assuming you're running the "full" suspension math the other big thing you'll need to know are the weights (corner and unsprung corner). These will most likely vary from car to car depending on what type of weight reduction methods you've done.

PharmDZ · 08-04-2019, 10:07 PM

Quote:

Originally Posted by gomer_110

@OP, assuming you're running the "full" suspension math the other big thing you'll need to know are the weights (corner and unsprung corner). These will most likely vary from car to car depending on what type of weight reduction methods you've done.

I have my corner weights from corner balancing the car, but how can I more accurately get the unsprung corner weight? What does that include anyways?

08-01-2019, 06:40 PM	#1 (permalink)
Brendan Track Member Join Date: Apr 2013 Location: Colorado Posts: 646 Drives: Poor man's Porsche Rep Power: 544	That article is wrong. Motion ratio is about where the control arm has leverage over the spring. Where the strut attaches has nothing to do with it in a divorced setup like what is on the 370. The front is .65 and the rear is .55. This is from my independent measurements and I found it elsewhere as well. edit: .55 rear motion ration if you are still divorced spring. if you are true type then it is in fact 1:1 (like a .98 or something if you want to get really particular) gomer_110, Rusty, Hotrodz and 2 others like this. Last edited by Brendan; 08-01-2019 at 06:46 PM.

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