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just to add a bit on super vw's post...
springs and dampers must be calculated to the frequencies of the wheel movement (this would be suspension travel), the pick up points must be able to handle the increased loads on the suspension due to the bigger wheels, and then the chassis must be stiff enough, with good torsional rigidity, and bending stiffness. then the tricky part will be to setup the suspension geometry/ damping rates and spring stiffness ( equal f/r?, increasing and if to what rate?) so that the car's handling will be predictable...
This applies to every car being designed from scratch, and the limitations when redesigning a car to work with very different components ( ie wheels) are many. Also a bigger motor produces more loads (static on a chassis) and even more dynamic loads due to the highier torque output ( at least use uprated engine mounts)
Chris
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Aircooled 4ever
1973 1303 going towards GL
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