Quote: Incorrect. The spring and the Caltrack pivot from the same point, the front spring mount, so that is the IC and it can't be changed.
What you are saying is true, IC is simply defined as the pivot point that the rear wheels rotate about. We both agree on that.
Imagine what happens when you experience spring wrap up under hard acceleration... your IC moves backwards. I hope you agree with that.
Now with Caltracs preventing spring wrap up, it simply means the IC doesn't move backwards as much... with me so far?
With the 2-hole setup, you can select the amount of force the spring stop pushes down with. So in other words you have 2 IC's to choose from. 1) back from the front mount and 2) back a little further from the front mount.
Because springs flex under hard acceleration, you'll not ever get your IC truly at the front mount, it'll be behind it by some amount.
Now when I said it emulates a 4-link, I didn't mean mechanically. I meant it emulates a 4-link in the fashion where if you select the top hole your IC is further back, and if you select the bottom hole your IC is further forward. But in either case your IC will never be in front of the front mount.
Hopefully I explained myself better this time! :-)
If you're looking for IC adjustibility, 4-link is the way to go. I was only refuting the original comment that Caltracs had zero adjustibility for IC... I was saying it wasn't zero. :-)
