TC Spring Chart
 

I put this together and my local guys found it helpful so thought I would post it here. This is a chart that lists TC springs by various manufacturers listed by order of magnitude. It is in lbs/in units. This way you can use different springs without having to guess their relative difference.

For XRAY, you're missing the following:

Blue-Green 15lb
Light Blue 20lb
Dark Blue 25lb
Light Purple 30lb
Light Red 35lb

Also, you can't always just go by the mfg rating, since the quality control varies from mfg to mfg. In other words, a 25lb rated spring might not be 25lb, but it might be 30lb, or even 20lb.

Nice quick reference chart, though.

here's one I did a while back and includes dyno comparisons too.

Spring charts for TC, Pan car & Buggy

oops, didn't attach.

Okay,
All Xray springs added.

Just thought I'd bring this back up so everybody saw it. if it's helpful post otherwise I'll let it drop.