OP - I really appreciate you gathering all that information together and posting it. It should be a good resource, especially if we can fill in the missing blanks. The thing is (and maybe it's just me) but I think that chart raises more questions then it answers?
I say that because obviously people look to a chart like that to help them pick the right springs for their rig. With that in mind, I think the spring rate info is valuable but what most people are looking for is, If I use spring "X", what should I expect "Y" in the amount of lift.
I don't think you can really deduce that information from that chart? If you compare the OEM T4R springs against say the OME 884's, the spring rate and wire dia. are very similar but the OME's are 1.58" longer. One might see that and assume the OME's will give about a 1.5" lift but the reading I've done seems to indicate that the 884's generally give 2-2.5" of lift?
Very good points, and you are correct. The main purpose of this thread was to point out coil rates between Moog and OEM FJ coils are not the same (this has come up in numerous threads lately). Even though Moog's are a "OEM" replacement, the specs are different and you shouldn't expect the same results (lift height and ride quality) as those running the OEM FJ coils. I then expanded the chart to include a few other common coil choices that I had readily available. I was hoping this would show show the varying coil rates and to help select the right coil if you're adding weight such as a steel bumper. I wasn't really intending on it as a guide for calculating lift height (it would be very difficult to do so with all the lift options out there). I did do something like this for the FJ swap (link in sig if you're interested), and even with just this coil there were a lot of factors to consider, and still only a "guide". Individual results could vary quite a bit.
So, here's a couple examples of how I felt this info would be beneficial:
First example (using rounded numbers for ease of calculation): I'm adding a steel front bumper that weighs 150 pounds. I currently have a 15" spring that's 580 lb / in. To properly support this weight and maintain current height, I need a 15" spring that's 590 lb / in (15" coil X 10 lb /in increase = 150 lbs). This still isn't set it stone, because there are other benefits to an increased spring rate. Folks using the FJ coils which is slightly stiffer agree the ride quality is improved. A stiffer spring would also provide lift, which is why a lot of us make the switch. I'll also say while 10 lb / in may not seem like much, over a 14" or 15" coil it can add up and make a significant difference in height.
Second example: A lot of folks want to run a full OME setup because of their reputation and price. It's a good kit and a good value. The front works very well for most. However, based on the specs of the rear coils, they are probably too stiff for most of us. Unless you have a lot of weight added to the rear (drawer system, steel bumper, tire carrier, etc). Something like the Toytecs, Icons, or All Pros may be a better fit (I've seen a number of folks make this switch after having OME rear coils).
So, this was intended to be used as a general reference to help select the right coil, and not necessarily lift amounts. I've researched this, and the main issue I found is that when people are measuring lift amounts, most measure fender to ground. This measurement is affected by tire size, so the numbers aren't as meaningful. A center of hub to fender measure is much more accurate to determine lift height. I think something like this thread is what you're after, but unfortunately there hasn't been a lot of participation. If there was, maybe someone could organize the results into one post (similar to my FJ swap thread, link in sig).
http://www.toyota-4runner.org/4th-gen-t4rs/144737-lift-vs-ride-height-list.html
