[ciburri]

Guys,
I just got a call from Dave from Eibach! Interesting info!
Get a load of this:

Eibach Pro kit
Front, linear 159 lbs/ft
Rear, progressive from 85-182 lbs/ft

Eibach Sport
Front, progressive from 114-182 lbs/ft
Rear, progressive from 74-205 lbs/ft


It was very nice from them to actually provide me with a range for their progressive springs and not just stiffest end like everybody else! If other's springs are indeed progressive as they claim!
Props to Eibach!

With Eibach's global experience in all fields of motorsport on 4 wheels, I find it intriguing that fronts on Pro Kit are linear and not progressive!
Driving wise I am perfectly content with front end - not to harsh or bouncy! It must be the fact that gas tank added to the front end load beside engine, tranny and a driver. Our little pigs are nose heavier than other vehicles thanks to rear "magic seats". That light back end has rates for golf carts almost! LOL! That must created some tough time for manufacturers since progressive rear springs have ridiculously wide rate range!
I get the point of Sport kit front end being progressive since it is up to 182 lbs/ft!
Looking at the numbers alone of manufacturers that have both Medium and Sport kit you can actually tell that Medium kits are dialed with more overall oversteer to help them rotate at slower speeds (AutoX-perfect & spirited daily use) than Sport Kits which are naturally stiffer for smoother track conditions and slightly less oversteer due to higher speeds they are intended for! Rear springs on Sport's have softer lower rate than Medium Kit to minimize inner rear wheel lift under extreme cornering speeds!
Good stuff!

This Eibach info is pure gold!

Ivan