As I recall, an '88 - '91 CRX-Si weighed about 1900 pounds in race form. That's one of the reasons it was such an outstanding race car. But the Japanese origami with sheet metal comes with a cost. Thin things flex, and flexing things crack.
This is the rack assembly and rack support subframe. So what you are looking at is the bracket above and in front (to the left) of the aluminum steering rack.
Now notice the lower A arm below the rack. What could that be connected to? Yes, the lower A arm support is one and the same as the steering rack support. That means that when you stand the car on a hard right turn, you might have 1000 pounds force transmitted into the chassis using the same bracket.
Is this a problem for a street car? Not so much unless you are making a habit of bouncing your car off of curbs. Is it a problem for a race car, probably not if you are racing the chassis a couple of times per year.
Is it a problem for an endurance race car that runs a couple of 12 hour races a year? It sure can be!
Why, well that much force flexes things. And if you flex something enough it cracks.
And when the bracket cracks, the lower A arm mount starts moving. And when it starts moving, camber changes, toe in changes mid turns and your razor sharp steering starts going away.
Here's my Frankenstein rack mount with its many repairs from years of endurance racing. I fixed it and it kept on cracking. See the last crack I found? See the start of a crack at the red arrow?
Ok, lets take a look at the hidden side. That sure wasn't going to last another race. And when it breaks, you are done at best, hurt at worse....
I guess the lesson is when you notice that things change on your race car, you need to investigate what's up before it jumps up and bites you.
This is from Huey, the best most winningest race car I have ever had.
By the way one of these days its coming out of storage after 15 years and I'm taking it vintage racing!
We won that endurance race but that is another story.....