Has anyone with an 07-08 Z installed Koni yellows and kept the stock springs? As has been mentioned herein, the rates of most of these aftermarket springs go lower than the stock rates, or are progressive which I'm not interested in for track use. I've been an M3 guy for years and this is my first Z so if anyone has track experience with this hypothetical setup I would be interested in impressions.

 

i worked with a guy who had koni yellows on stock springs in his 04.5...he was happy with it, stiffer better dampening same ride height was what he wanted, do that with some sways and you'd probably be happy from the sounds of it.

 

IMO, run a search under Koni, narrowed to this section of the board. Skip to the very first post's and read about owners with 03/04 cars. Yes, their car's have 27% softer rear springs and 17% softer front sway bars, but you'll get the owner comment's your looking for. I would also search Koni and narrow the search to the autocross/road racing section, though be carefull, some owners will talk about Koni's buy fail to mention they have been revalved.

Since you mention the issue with aftermarket springs, I did recently sell my custom Koni setup which used a aluminum 6061 front lower spring seats that I fabbed up myself to run 448lbs linear Tein tapered springs with oem 05 427lbs rear springs on cut down oem upper spring seats, gave about a .5" drop. So, for not too much it is possible to do better spring wise.

 

Thanks. My understanding is that my 08 has 427 lb rears in accordance with the change that occurred in 05-06. Is that incorrect? That would mean that our later cars have stiffer springs than and 03, not the other way around.

 

Correct, fixed my post to say "softer" instead of stiffer.

oem 2003-2004
314/342

oem 2004.5-2008
314/427