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11-26-2012 #28
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- Join Date
- Apr 2006
- Location
- Des Moines, IA
- Posts
- 599
There are two main reasons to NOT run a coil over on an OE lower control arm:
#1: Trunnions
You have to use a trunnion (t-bar, tie-bar, whatever you'd like to call it). The OE lower control arm will not live when all the force is applied to such a small area.
This is one of the reasons we designed our lower control arm to hold the coil over in double shear.
You are correct, there are aftermarket arms that use a trunnion. They typically use a thicker material in the mounting area.
#2: Stroke
We design all our parts to lower the vehicle. Not to be a jerk, but I don't see the value in coil overs if you cannot go lower than stock height. That being said, when lowering the car you typically do not have enough space between the OE upper mount and the OE lower control arm for proper shock stroke. You want 5 inches of wheel travel. So if shock (coil over) is at a 2:1 motion ratio the shock must have 2.5 inches of stroke minimum. Couple the short stroke with a monotube damper and you don't have enough room.
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