# what coils to use???

#### 4.0B2

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Do the math and you can figure out exactly how much it'll compress under the weight of your rig. 240 sounds right but idk about the height exactly.

#### 4.0B2

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Now on SAS, you may be okay with a softer rate.... Idk.

#### tomahawk350

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Im looking for a stiffer rate as I feel my RC springs are too soft. Yes I have a SAS so lengths are ok. What I don't know is a weight of the front end of my rig. Not easy to get either...

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#### 4.0B2

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If you know your compressed height, uncompressed height, and spring rate... You can figure out the other number.

#### tomahawk350

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Ahhh. I gotcha now.

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#### 4.0B2

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Get me the numbers and I'll help you out. When I get on my ipad or laptop tonight or tomorrow night I'll search for the post from Legoms with the explanation of how it works.

It's in my build thread somewhere

#### 4.0B2

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#### bobbywalter

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close enough

it sure as hell is not that perfect though.

with the softer coils, running the bags insidethem offers the max capacity from the setup.

worth consideration.

#### tomahawk350

##### Member
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Thx 4.0!! Here's what I came up with:

F=(190 lbs/in)(22.5 in - 16.5 in)

F=(190 lbs/in)(6 in)

F=1140 lbs

My B2 has its orig 2.9/5 spd with a D30 SAS from an XJ. Custom winch bumper and winch w steel cable. Does that number jive? If so, what PPI rate should I be running for best offroad stability/ride?