Going to order my front coiloverspring for my build I'm going to start in May. I'm planning on ordering 14" FOA 2.5" remOTE reservoir with med comp. Valve and light/med rebound valve. I was thinking of a 14" 250 over 16" 350 but I am not sure. Any ideas would be great.
It's a 98 zj 5.9l getting custom long arm lift, full internal cage, partial exo cage, prerunner style tube bumpers, AAM full width axles 37-38" tires.
Unless you plan for a ton of uptravel, those rates will be a bit high. And running the 16" lower will not allow you to dial it down. You will be stuck with 7-9" of uptravel.
Combined rate on that setup is 145 lbs/inch. So even if you shot for 50/50 at 7 up and 7 down. Fully engaged springs, which when using a 14 and a 16 on a 14" shock you would have no choice but to be fully engaged, may even have to prelaod a small bit.
So 7 x 145 = 1015 lbs per side to compress the shocks 7 inch each.
Lets take a 1 ton Zj with 38's and weigh it. Even with a V8, heavy tires, 14 bolt and a 60 you will top out at about an absolute 5500lbs. And thats going heavy.
1 ton front diff with tires, rims, suspension, comes in right about 1000 lbs.
Rear 1 ton with tires, suspension, etc etc, 700 lbs.
Leaves you with about 3800lbs of sprung weight. Lets give with 60/40 front to rear weight division.
3800 x .6 = 2280 lbs
2280/2 = 1140 lbs per side
1140lbs/145 lbs/" = 7.86" of compressed shock.
6.2" of uptravel.
If this worked out it would be just great, but I dont think you will come in that heavy and if you dont you will be left with not adjustment to dial out height.
Happens all the time when people start with heavy rates.
I have have a lot of 14" springs. You could borrow some, get your weights, and get a much more accurate idea of what you will need for a final rate.