Coil perch ?

I have been dealing with getting the correct lift from a coil. It seems like I am one of the few to install these coils and not get the provided lift. There is an option to get a strut from the same company who makes them with the coil perch one inch higher than where the stock coil is. They do this to provide higher lift with heavier vehicles. I have been told that the one inch higher perch will translate into one inch higher lift. My question is that if you put 1/2 inch top plate spacer in it provides one inch of lift. Why is it then that a one inch higher coil perch provides a one inch higher lift? Isn’t it the same principle. I have two sets of coils now and trying to figure out what ones to put in. If it is truly a one inch gain then I know what to do. But I don’t want to put something in that will then double that inch. Hope this isn’t confusing.

 

It's because of the motion ratio.

https://en.m.wikipedia.org/wiki/Motion_ratio

The ratio is not exactly 2:1 but close so you can use that as a rough estimate. 1 inch at the shock does not equate to 1 inch at the wheel, it's closer to 2 inches

 

So it shouldn’t matter if the perch is higher vs a top plate spacer? They will have the same ratio? The strut is 1/2 in more travel as well.

 

Correct, it doesn't matter since they're both done at the shock location and the motion ratio is the same. You might get more lift with perch option since you are preloading the spring more. More travel doesn't do anything in this scenario.

FYI, we don't have struts in our vehicles, they are just shocks. Struts are shocks that double as the upper control arm, we have an upper control arm, therefore, we have shocks.

What shocks are you looking at? If I were you, I'd go with Bilstein 5100, they have multiple perche positions and you can mess around with getting the perfect ride height.

 

I have Dobinsons. I have been working with them and their customer service is top notch. I am the only one they have delt with that is not getting the lift out of there 3rd gen coil. They are sending me there shock that puts the perch one inch higher than stock. This is normally used in heavy front end application to acquire ride height. I will measure the perch over what I have now. So it’s safe to assume that if is one inch higher than what I have now it will give close to two inches over what I currently have? Thanks for the knowledge on the shock/strut clarification.