360 Ride Height Adjustment

My 360 Spider 04 although low mileage (4000) has dropped a bit (12mm 1/2" at the front end, and although the car is covered by extended warranty the dealer says they will not rectify it as a warranty item.
Does anyone know the motion ration of the spring lower perch nut on the front shocks, or in other words what each full turn will deliver in terms of height in millimeters?

Thanks in advance.

If the car has dropped 12.5 mm something is definately wrong*. There have been some 360 which have suffered from a spring tower collapse, most of these are cars that have seen lots of heavy braking. Get this investigated first (and set right).

However, the 360 responds with about 1.5mm of ride height change for each turn of the perch. When doing this, be sure to have the car corner weighted as you adjust the ride height so that each pair of wheels carries as close to 1/2 of tis axel load as possible. (and more importantly 1/2 the weight is on the left side of the car with the other 1/2 on the right.)

Then do a full alignment That much change in ride height will take an aligned suspension out of tollerance range.

And the above should be done (idealy) with new tires on the wheels.

[*] any chance that the front tires are an incorrect size (rolling radius)?

Mitch,
Thanks for the input. The service manager at the Ferrari dealership said that 'settling' of the front suspension, is quite common in Euro cars.
The tyres are Pirelli P Zero 215/45 as standard and are in good shape, having had no real hard driving.
What weight do you suggest as distributed weighting 1/2 and 1/2 left and right?

One does not first shoose a weight and then corner weight to those specs. One chooses to corner weight the car and lives with whatever weights end up on those wheels.

When corner weighting the car a scale is placed under each of the 4 tires. Reading these scales then tells one how much weight is one any given corner, the sum of the weights tells the total weight of the car. Comparing the weights LR to LF, RR to RF and LR_RF to RR+LF tells you how the weight is distributed arouns the wheels.

The most important weighting on the car is the diagonal. What we want is that the LR and RF carry the same total weight as the RR and LF carry. This makes the car so that it does not turn as brakes or power is applied.

My car carries 30 pounds more on one wheel than the other on the same axel (both ends) and this results in a scant 4 pound difference in the RR+LF measure.