Any insights on corner balancing for a G35?

 

You'll want to find a shop that can performe the service for you with the willingness to make the numbers as good as possible. You've got Cusco Zero2's what have ride height adjustment's seperate spring spring preload so that will help you (not a fan of more then minimum spring preload levels). The biggest challenge IIRC is the car's high left front scale readings.

 

Can a car without coilovers be corner balanced? I have been told that it can but I don't see how. Can someone explain how corner balancing is done?

 

It can be done without coilovers by moving things around, relocating battery, adding weight, removing weight, etc.

Corner balancing is a tedious process to say the least. There are plenty of good write ups on the internet, just Google "How to corner balance a car" or something like that.

*Important* When getting your car corner balanced, remember to disconnect the sway bars as they provide tension to the corners that can throw your numbers off. Also make sure that each time you drop it back to the ground after adjusting the ride height. Roll the car back and then forward again so the suspension gets settled in again.