Hello all and thank for let me Join the group.
i have a 2012 1.3l fit and few days ago i changed the springs and put tein green sdress and two days ago i changed the shoks and put koni shoks, but the car drops really hard in any bump, im concern why is that problem or maybe some of you have try this configuration or any advice, also the car is on 17" wheels with 205/45 profile, i apreciate your comments and help good day

 

Tein springs are soft. You might want to change to a higher rate springs

 

If 'drops hard' means it rides harshly compared to stock, that's going to be normal with pretty much any aftermarket lowering springs. It's a matter of how much, but they're all going to have a higher spring rate than stock. Running larger wheels means a shorter tire sidewall, too. Smaller wheels with more rubber tend to have more of a soft ride- I run 16" summer wheels/tires and I definitely notice the difference when I put the 15" winters on. Much softer.

If you mean the suspension bottoms out, like you're hitting the bump stops all the time, you might have defective shocks.