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Old 08-04-2018, 02:13 PM   #3595
Racecomp Engineering
 
Join Date: Nov 2011
Drives: 2016 BRZ, 2012 Paris Di2 & 2018 STI
Location: Severn, MD
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Quote:
Originally Posted by cjopant View Post
I'd love to understand how to reduce how much my ride height sags with weight fluctuations. If I have a full tank of gas and a trunk full of jerry cans, the ride height in the rear will be noticeably lower. Is this a result of soft springs?

Here's my setup in part:
  • KW V3 Coils - (Not 100% on the spring rate, but they're from 2017 so I think they're 230/285)
  • -2.5 camber all around on Verus plates
  • 18x9.5 +38 wheels w/ 255/35R18 MPSS
  • Verus rear control arms
  • Verus rear toe arms
  • Pretty low - less than a finger gap all around
  • Pretty stiff - I recently had the rear compression stiffened in an attempt to stop the sag (and subsequent rubbing), but it's not really working and the ride is now a little too harsh for the street.

Here's a pic of how it's currently sitting. I'll likely raise it up a bit, and go back to my previous compression settings but I've had this problem (and rubbing) at higher ride heights too.




Are my springs too soft?
Am I feeling the 2mm difference between my +38 setup and the +40 that most other folks seem to run?
Am I too low? (probably?)

Any guidance would be greatly appreciated!
The change in ride height due to changing weight is a function of spring rate.

Changing compression settings will not affect this in any way, so don't do it for that reason.

Your car looks a little low IMO.

- Andrew
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