Custom spring & 5100 adjustable strut combo (1.5-3.5 lift range)

[Matt]

PERFECT!!! Thanks

[Matt]

Now that I know the length, i did some quick calc's and think that stock spring rate from the OME catalog is low... time for an excel sheet so I can play with the numbers a bit.

[hoaxci5]

Does that pic give you everything you need? I should have some other angles if you need them, I have the rear spring pics also..

[Matt]

Does the 13.25 go to the top edge/tip of the last coil?

[hoaxci5]

It's been awhile since I took the pics/measurements but I'm pretty sure I stood the spring up and dropped the tape measure to the floor and read it at the highest part of the spring. All of the measurements were done with a tape measure and eyes so no fancy measuring devices so +/- human error/lazy eye/beer in hand?

[Matt]

lol sounds good. Tape measure accuracy is all i need for this project

[jjt250]

Hey Matt, I got stock WK CRD springs lying around. I'd be happy to take some measurements if you need any. For what it's worth, there was a noticeable different just by eye when I was comparing Hemi XK springs with my stock WK CRD springs so the OME catalog could be using any WK/XK spring.

[Matt]

Jacob could you post up more pictures of that spring? Need to estimate the number if effective coils so I can calculate the stock spring rate (assuming material properties similar to OME)

[Matt]

Just for giggles....

OME HD 14.37" free height, 8.9 coils, 630 lbf/in
HD 1/2 coil cut = 13.56" w/667 lbf/in = 10.61" = .64" less = 1.28" lower (1.78" lower w/spacer removed)
HD 1 coil cut = 12.75" w/710 lbf/in = 9.98" = 1.27" less = 2.54" lower

I feel like these figures are over-estimated... likely due to the difference between "coils" and "active coils" which does factor into the calculations (I've been assuming they're all active coils); let alone all the other guestimates i've been working with. I'm thinking the "free height" might also be measured from the center of the wire, not from the edges of the spring.... that'd definitely throw these figures off.

Case in point there are guys running a modified superlift with 1 coil cut off an HD spring. Using these assumptions/estimates cutting that one coil would nearly negate the initial lift achieved by that spring.

[Matt]

I think im gonna have to stop driving myself crazy and try taking a more qualitative approach..... then cut some damn springs and install them and see what happens

OME MD = 14.56" free height
OE Spring= 13.25" free height (1.31" less than OME)

Cut OME MD spring rate > OME MD spring rate (530) > stock spring rate ... so regardless of what it ends up being, its a heavier rate than stock.

I'll double check the measurements when I have the springs here, but if 1/2 coil cut off the OME MD gives a 13.75" free height, that's 1/2" over stock which should yield ~3" lift with the 5100s on the highest setting, not including additional lift from the increased spring rate.

So there it is, i've convinced myself to cut 1/2 coil again. Lets see if it sticks this time lol