Nissan multilink static roll center

[260DET]

Seeing these rear suspension sub frame assemblies are being more commonly transplanted, I'm doing one into a S130, it may be useful to set out how a multilink static roll center may be calculated. As John C pointed out a while ago, the transplant of a suspension setup with an unknown roll center at one end of a car can lead to handling problems. At least thats how I recall what he said

 

Anyway the advice to hand is that calculating the multilink roll center may be compared with calculating that of a unequal length double wishbone setup. Which is discussed in most suspension books.

 

Then if you have your rear roll center a bit higher than the front it should be somewhere about right.

[260DET]

Another point concerning this suspension is that the subframe may be tilted forward or back to give different characteristics. Tilting it forward should aid traction by giving more squat. Tilting it back gives anti-squat, suitable for drifting for example.

[tannji]

Interesting point... I would love to see some testing on this, or even an adjustable subframe allowing for testing and extended tunability. One thing that would concern me immediately tho is the driveline angle...

[JMortensen]

I have read that one of the limitations of the Z32 as far as drag racing is that the design incorporated too much anti-squat. Just food for thought, if you start messing with that aspect of the geometry you probably don't want to do more just because you don't like squat in general. Get too much anti-squat and you'll just roast the tires coming out of corners instead of hooking and accelerating.

[260DET]

This is where the subframe tilt info came from, Whiteline put out a set of outrageously expensive 'packers' to do it. http://www.whiteline.com.au/docs/instructs/203a_KCA349.pdf