Quote:
retrorally wrote:
Something that you have to keep in mind is that by design the leaf spring rear end already has a built in roll centre. By fitting a pan hard,watts, Mumford or other, a fixed point of roll centre doesn't magically appear. The built in rc will still be there but you will be working with or against it depending on were you set the height.
You will probably find that you end up very close to where silly old mr Datsun set it 40+ years ago. I would say he was a pretty smart bloke.
When you add a lateral link, you don't end up with two conflicting roll centers. It changes the Rc location.
Mr Nissan designed it for the stock car's Cg, height, spring rate, 155SR12 tyre, and front Rc height. On a track car you do not want it anywhere near where Mr Nissan put it. But that's alright, because unless your car is standard height the roll center will no longer be where Mr Nissan designed it to be anyway. eg my 120Y: Stock rear Rc is about 38mm above the top of the axle housing. Lowering it 48mm moved the Rc 66mm lower than standard and about 285mm from the ground with a 185/60 R14 tyre.
Lateral location of the diff is nice if it's done properly, but there' no guarantee it will improve your lap times, and it certainly isn't important to provide a predictable handling car. You can (and should) have a perfectly predictable handling car without one. The instability Tom's car has is not because there's no lateral location members.
I'm with LOWTECH, I never had any need for one either from 116rwbhp L18 up to 300rwbhp CA18DET. No shortage of lateral grip or problems with stability here:
![Open in new window](javascript:CaricaFoto("http://datsun1200.com/uploads/photos/2754.jpg");)
![Open in new window](javascript:CaricaFoto("http://datsun1200.com/uploads/photos/16055.jpg");)
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