Thanks, should have paid attention! What is a length on the front and rear?
Not arguing, but that seems really extreme. Isn't that really soft in the rear and very hard in the front? I get that the springs stand up in the rear but 125lbs per spring per inch is when the engine alone weighs in at 400lbs. It just seems like the rear would roll in a turn.Sorry work has been crazy. 125 lb rear with 600 lb front is working very nice.
So if I understand this setup correctly, there is no crossover ring being used, only a floating spring divider, meaning that the front system has an effective linear spring rate of 120 lbs until the the Eibach tender is coil bound, at which point you have a 600 lb spring rate until the tender is no longer bound. Are you experiencing coil binding with the Eibach tender springs? If not, wouldn't it make more sense to run a single 120 lb spring?The 600# spring is 8" long ( makes it easier to install helper spring) Use Hypercoil HYP18DS100 adapter between main spring and helper. Helper spring is Eibach EIB0175-250-0150. Requires that main spring be compressed to install helper.
Any brand of 2.5x8x600 coilover spring will work.
The rear spring is a QA1 2.5x10x125. It is longer than original to give more consistent spring rate.
PS. you can use the Hypercoil CS100 as the helper spring, it is easier to install.
This setup seems work well but each car is different, and each driver want a different feel so it may not be perfect for every situation.
The reasoning for this setup is to take up the body roll control on the front wheels as the have very little load and not overload the rear in cornering so that they can put power down for acceleration out of the corner.
I ordered the 9HT300 springs, which on Summit are still the same price as QA1. Those 10" 150lbs springs are a great price!Thanks everyone thats contributed to this thread, has made ordering all the part really easy.
While getting my rear coilover parts all together, found that Summit Racing has the springs way cheaper than directly from QA1. The Cap was cheaper too, free shipping as well.