cracked subframe

[Mike R]

Originally Posted by MisterCorn

I understand the coke can analogy, it is the collars which I can't see how they fit in to the equation. Whether the collars are in place or not, when the subframe is bolted on to the car there is no relative movement between the subframe and the chassis, the clamping forces of the bots see to this. I can see that the collars would allow a more precise initial alignment of the subframe on the chassis by taking out the slop in the holes, but once it is clamped together I can't see how it has any impact at all. Sure the chassis around the mounting can and does flex, but I can't see any way in which the collars would affect this.

For the coke can analogy would it not be like drilling a more snug hole in the can so that the bolt can be fitted more accurately in the first place?

I really feel like I am fundamentally missing the point of what the collars are supposed to do here, I'm not being deliberately thick, honest!!

MC

I just feel the collars do a belt and braces job. I have them on my S2000 and noticed an immediate improvement, so will be fitting them to the CSL as well.

I just think the elimination of any movement in this area is going to improve things and off the improvements that are stated in the above clip regarding geometry.

At the end of the day it is your car, but for the sake of £200 fitted, it seems a bit of a no-brainer to me (even if it only gives the geometry improvements) .