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Hi
Your not a dummy - that much I can tell, I dont claim to know everything.
But your last post is a bit confusing?? - perhaps its a language barrier between Aust and US
What do coils have anything to do with it? Coils have a direct relationship between the height/ lift between the body and the axle(arm) - if the coil is sagging (ie 20 yr old car) the camber will change as the car is lower and wear will occur on the inside - do you want me to draw a picture to explain?
Unless he's wanting to change the springs. Confusing??? There are no leaf springs in the Z? I must assume that you are referring to coil springs - in Aust we call them coils or coil springs - generally springs refer to leaf type which are not present. However I also understand that there are coils in springs hence coil springs - I wasnt referring to the amount of coils in the spring but rather the height of the coil/ spring under load - see previous post.
And even then, there is no way to adjust the number of coils in the springs. Correct you cannot adjust the height, the number of coils in a sized spring can change depending on manufacturer and type (cold /hot/ performance), having said that there is a determined amount of coils in the specs of the manufacturer this also includes thickness.
Alignment shops NEVER touch springs. They just can't. This is correct!!
There is nothing to do to adjust them. This is correct!!
So since the stock Z31 is only capable of having the toe adjusted, there isn't much he can do about them. This is not quite correct as the castor can be adjusted as well.
NOTE: If the coil spring is sagging after twenty years of use then they need replacing due to the wear from the camber change (will be negative camber causing wear on inner of tyre)
Only if he slots the rear crossmember can the camber be adjusted. Yes but if the coil is sagging you need to replace the coil - slotting will only give you an adjustment - it will not replace the stiffness that the coil has lost - he needs to fix the problem (sagging coil) as this effects the ride itself and places more load on the shocks to absorb the excessive bounce on a bumpy road - slotting is good if the coils are not quite to specs as it can compensate the camber missing from the height adjustment (negative/ or positive)
Hope this helps
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