an easier way to calculate this would be to find the stock spring rate of your truck versus the spring rate of a 240as well as a comparative size(easier info to find) then you can make the comparison over how much more weight the 240 springs have to support. with coilovers though you could probably adjust the height of the upper mount in your truck bed to gain the extra inch or two.

 

Spun down meaning the coil is as low as it will go. I had coil overs on my Fc and understand fully how they work. But yes spring rate does have to do with how high/low the vehicle will sit. Thats why they have fucking rates. Not just be like "OMG JDM my rates higher than yours."

I know what I need, and I understand how it all works. I need the weight so I can figure everything in. Simple.

 

Coil springs arent figured the same as leaf springs bro. Thats why a need the weight of the 240. I know I can do it by raising the mount points which I will compensate for. But I want to know if I can do it with using the same mounting points as a 240, and being able to get away with using some other suspension stuff from the car.

 

actually.
spring rate has very little to do with height.
spring length does.

sure, if you put 500lb. springs in a car that should have 1000lb. it will be lower, but the springs will also be preloaded and have higher effective rate.
what you need to do, is figure out the height you need. then rate. and order custom springs.

and its not that i dont understand english, its that youre going about this incorrectly, and going way overboard.
hardbody with 240 suspension?
why, who cares?

 

Why, because I can. Why do people do anything to fucking cars? I got my truck and I will do what i want to it.

 

im still trying to figure out how to use my coils. glw this.

this was so funny

 

what are coils...........round here we just cut springs.

so just cut your leaf springs to the desired ride height

 

So cut my leaf springs? Then I will only have 1 mounting hole... Im sorry but Im no ghetto ass z31 owner.

 

regardless, paul is right. that is what you need to do. I think it would be neat to have a full blown suspension build on the truck, but for go fast reasons, not super low reasons. But to each his own.
Do what paul said and go from there.

Do you know where the 240 mount location is going to be relative to your truck? That should give you a place to start your measurement from.
Do you have the rear sub frame installed/in your possession?
Do you know how much the rear of your truck weights?
If you've got all of that, then you ought to be able to figure out what you need to order. You might get lucky and find that it is pretty close to what we already use, and not have to custom order anything.
I still think you've got this idea in your head about what you need to know and because of that, you aren't accepting the fact that this isn't really that hard.
If anything, call up tein or whoever you've going to get your springs from and ask them A) what they suggest to do to get the results you want and/or B) what they would need to know to make custom springs for you.

 

dude, hes got it under control. hes starting a shop you know.