Why hasn't anyone made LCA relocation brackets that work with the stock/GT500 LCAs?
All of the ones I've seen say they require aftermarket LCAs.
Simple packaging... The stock LCAs are shaped like a dog-bone, with bulbous ends and narrow middles. When installing the brackets, you need to use a bolt in the stock position to hold them in place (unless welding, but even then, you need SOMETHING in there to keep the bracket and mount from torquing or collapsing inward). That bolt, then, prevents any part of a LCA from occupying the same space.
There are hundreds of people out there running our relocation brackets with factory LCA. We were recently doing some NVH testing for a new compound bushing in the works, and were running the stock LCA for a little over a month:
Here is a good idea of the clearance. You cannot run the upper most position of the BMR brackets, due to the "through" bolt that Dave was speaking about. Now, if you weld the brackets in, you can remove that through bolt. You can also use the upper most position, if you modify the factory LCA - I have road course customers who do this.
Really, all you're looking to do is move the arm mounting point down an inch or so, but if the radius of the end of the arm is greater than that, it will interfere with the hardware used to attach the bracket to the car.
It is not possible to drop down 1" from the stock position, without serious modification of the stock axle LCA mount, as well as fabbing up some custom brackets, plates or tabs.
That said, a car that is dropped 1"+ from the stock ride height, can typically benefit from dropping the LCA down about 2" (that would be the first hole in our bracket)
2" down is about as close as you can get, to the factory mounting point with an aftermarket bracket.
For a car that is lowered 1.5"...especially an 05-10 car.....a 2" drop in LCA angle will work much better in corner exit, than a stock position LCA.
The recent fad, is, customers (handling specific) are calling me and ordering the 2011+ UCA Mount and our relocation brackets. They are using the 1" longer UCA (they grab a stocker form ebay), and our Upper Mount actually has a position that is 1/4" higher than the factory - so this alleviates some of the erratic axle movement due to the aggressive AS%. They pair that position with the Middle position of our brackets, and it is working extremely well.
The 1" longer UCA, paired with a higher UCA mount.....can do wonders. You can go more aggressive on AS% - specifically adjusted by LCA, and not suffer as much from an erratic rear axle.
