430 Anyone put Scud springs on a stock US-Spec F430?

H&R springs lower the car depending on how you set your shocks.

You don’t have to drop it by 25 mm; you can go lower or less

 

The first thing to know is that you must always maintain the chassis level between the front and the rear.


H&R springs are shorter than the original ones, but they are also stiffer.


When you lower your car, the spring extends: the more you decompress it, the lower the car sits.


On a coilover system like on the F430, the adjustment is done via the collar located under the spring. By loosening it, you decompress the spring and lower the car. By tightening it, you compress the spring and raise the car.

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I think you're overthinking it. Think of the perch as the baseline. The springs do not know where the perch is set, in fact it's completely irrelevant to their operation (assuming as long as there is threads available for adjustment.)

 

You need to lower it at a minimum, so the spring must be decompressed; otherwise, the damping could be too soft

 

Being Titanium they are much lighter, but still far too soft - even for the road.

 

I had a Ferrari mechanic lower my 430 around 3/4 inch IIRC on the stock springs. It's plenty low, if not too low. This was done at least a dozen years ago. No adverse effects noticed of any kind, other than scraping the front bumper occasionally. I'll try to find a photo.