Tuning menu spring rates have never made any sense to me in Forza Motorsport when trying to compare them to actual cars and their tuning parts. I finally tried changing game’s units to imperial to see if it makes any more sense and it really does. If I understand this correctly then metric units show 10x too big value. On the picture front spring rate is set to 500 LB/IN using imperial units and then the game is changed back to metric units. Isn’t this supposed to be 8.93 KGF/MM?
You are absolutely correct.
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I confirm that the values should be 10 times smaller. Was confused by this too until I found out that there is an error. Oh gosh, I hope at least everything is correct in the physics model and it’s just the UI 
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We’re closing this thread due to low reports / reproductions. If you are still experiencing this issue you can create a new topic. At the time of the closing this topic had 8 votes.