I know on the installation instructions of the spohn SFC's it says to install them with the vehicle at ride height. So, if I were going to get lowering springs, should I have them installed before I installed the SFC's? Would it make a difference, or does it not really matter? I was just wondering since the springs would change the ride height...

Been bored, thought up that question

 

"Ride height" hints to the car being on the ground or with all 4 wheels loaded, IE, not in the air on a frame lift. The car needs to be on the wheels somehow, in other words. The lowering springs will make no difference.

Ed

 

This continues to puzzle me. Why does the car need to on the wheels. Do these F-bodys have so much flex in them when raised on a lift? I have wondered if SFC were installed early on the original GM assembly line would all our cars be rolling down the road crooked?

 

If you weld in subframe connectors while the car is on a frame lift, when you set the car back down on it's wheels, the subframe connectors will be fighting against the subframe's tendency to 'settle', or sag, or flex, or whatever you wish to call it. You don't want the connectors fighting against the subframe itself. This will create pressure points and undesirable stresses when the car is just sitting still on a flat surface, and these stresses will only get magnified by the stresses seen when driving the vehicle. This will greatly increase the risk of cracks, and possibly other problems.

 

If you guys would, click on Steve Spohn's sticky on "dual cat SFCs" at the top of the forum. Find the pics he posted of the install. These show the car NOT on it's wheels, but supported under the ball joints on the a-arms and (I assume) the rear axle. This would give you the same effect of having the car on all 4 wheels.

Ed

And yeah, what Raskell said.

 

and yeah, what ebmiller said.