355 Challenge race springs on road car?

Why not? See no problem. But why you want to do this?

 

The CHs are very hard on the road, not funny...

 

... very hard and very funny! a very pure experience!

 

I answered this question in the 348/355 forum: http://www.ferrarichat.com/forum/348-355-sponsored-bradan/546710-355-light-nose-speed.html

I suggest you drive an F355 Challenge and then make your decision whether or not to put Challenge springs on your road car.

Challenge springs come in two spring rate pair varieties:

1800 lb/in Front and 700 lb/in Rear
2200 lb/in Front and 900 lb/in Rear

 

Too stiff for Los Angeles roads.

 

I'm running even softer spring rates in my challenge and it still bounces all over the place, but I don't have to worry about it bottoming out like my two 308s did

 

I have 2200 lb/in Front and 900 lb/in Rear Challenge springs, John. It's like someone tack-welded the front shocks.

 

If you were to do this you would need to have the dampers revalved since the stock valving would be wholly inadequate for the stiffer spring rates.