GEN 2 ICON .5-2.25" Attitude Adjustment Collar

[Slow6]

The rpg preload collar isn't a spacer it's a preload collar. The icon kit comes with a spacer and that is how they claim to increase ride height while keeping factory ride quality. They make it sound like more preload a bad thing even though everyone that has installed the rpg collars says the extra preload an improvement.


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Right but the 2.25 setting on the RPG a lot have said it's too stiff, so 1.75 with a pre-load and a .5 inch shim is just splitting the difference a half inch and taking some of the preload off. Is half an inch on top enough to cause any damage in the long run? I would think not for most people, and most that would have an issue would likely only be using this as a temporary solution to getting new front spring and shock assembly. I'd like to get one of the adjustable as an option, it might be temporary it might not.

Who I would really like to hear from is someone that has gone from a 2.25 perch kit to either Eibach or Geiser springs. Which is better for ride quality?

 

[xrocket21]

The

Right but the 2.25 setting on the RPG a lot have said it's too stiff, so 1.75 with a pre-load and a .5 inch shim is just splitting the difference a half inch and taking some of the preload off. Is half an inch on top enough to cause any damage in the long run? I would think not for most people, and most that would have an issue would likely only be using this as a temporary solution to getting new front springs. I'd like to get one of the adjustable as an option, it might be temporary it might not.

Who I would really like to hear from is someone that has gone from a 2.25 perch kit to either Eibach or Geiser springs. Which is better for ride quality?

The performance of springs is measure by something called "spring rate"

The stock springs are rated at 533lbs/inch. This means that if you put 533 lbs on the spring, it will compress 1"

Preload collars change ride height, but they do not affect spring rate. If you put 533 lbs on it, it will still compress 1"

There may be some minor changes due to different geometry, but the spring rate doesn't change.

Anyone who says that they enjoy how much stiffer the front is, or how much less it dives when braking is a victim of placebo affect.

2.25" collars aren't any stiffer feeling than 1.5" collars or stock.

This is a SUPER common misconception on this board...

 

[Slow6]

The


The performance of springs is measure by something called "spring rate"

The stock springs are rated at 533lbs/inch. This means that if you put 533 lbs on the spring, it will compress 1"

Preload collars change ride height, but they do not affect spring rate. If you put 533 lbs on it, it will still compress 1"

There may be some minor changes due to different geometry, but the spring rate doesn't change.

Anyone who says that they enjoy how much stiffer the front is, or how much less it dives when braking is a victim of placebo affect.

2.25" collars aren't any stiffer feeling than 1.5" collars or stock.

This is a SUPER common misconception on this board...

Good info.

Now I have another question. If it starts out already compressed 2.25 inches at what point does it take more than 533lbs to compress 1 inch? At some point it's gotta change, or would you bottom out somewhere else first? Anyone know the compression rate of the Geiser or Eibach springs?

 

[xrocket21]

Good info.

Now I have another question. If it starts out already compressed 2.25 inches at what point does it take more than 533lbs to compress 1 inch? At some point it's gotta change, or would you bottom out somewhere else first? Anyone know the compression rate of the Geiser or Eibach springs?

Its a linear spring, so it should be the same throughout its cycle. At some point it may change when its super compressed, but I cant remember.

The geiser is progressive, so as it compresses, the spring rate increases, say 533lbs per inch for the first inch, then 600 for the next inch, 650, etc (made up numbers)

Eibachs are linear as well with a spring rate of 583 lbs/inch.

 

[Slow6]

Good info again, I guess when the time comes I know what I'll do in the front. (maybe)

Thanks for the information

 

[xrocket21]

Good info again, I guess when the time comes I know what I'll do in the front. (maybe)

Thanks for the information

no problem. Knowledge is power!

for what it's worth, I run 2.25" collars up front and I have deaver +3 progressive springs on the way for the rear

 

[Slow6]

no problem. Knowledge is power!

for what it's worth, I run 2.25" collars up front and I have deaver +3 progressive springs on the way for the rear

What brand collar? Any plans for a spring swap or will you keep what you have?

 

[xrocket21]

I run rpg, but brad of collar doesnt matter really. I went from 1.5 to 2.25. Still some rake at 1.5. Very level at 2.25, so ill get some rake back with the +3 deavers, but im really looking forward to the reduced axle wrap and wheel hop.

I have no plans to change the front springs. Maybe if in the beginning if i had just gone +3s and geisers, but they werent out when i got started

 

[FullAuto]

That's just not correct. Once you compress it to a certain point you are placing the spring in in its rebound mode at ride height. There was a huge difference in feel from stock to 2.25 for me. It's not a placebo.

The


The performance of springs is measure by something called "spring rate"

The stock springs are rated at 533lbs/inch. This means that if you put 533 lbs on the spring, it will compress 1"

Preload collars change ride height, but they do not affect spring rate. If you put 533 lbs on it, it will still compress 1"

There may be some minor changes due to different geometry, but the spring rate doesn't change.

Anyone who says that they enjoy how much stiffer the front is, or how much less it dives when braking is a victim of placebo affect.

2.25" collars aren't any stiffer feeling than 1.5" collars or stock.

This is a SUPER common misconception on this board...

 

[Slow6]

Its a linear spring, so it should be the same throughout its cycle. At some point it may change when its super compressed, but I cant remember.

The geiser is progressive, so as it compresses, the spring rate increases, say 533lbs per inch for the first inch, then 600 for the next inch, 650, etc (made up numbers)

Eibachs are linear as well with a spring rate of 583 lbs/inch.

That's just not correct. Once you compress it to a certain point you are placing the spring in in its rebound mode at ride height. There was a huge difference in feel from stock to 2.25 for me. It's not a placebo.

I called Eibach and spoke to a rep, Spring is linear and 548 ponds per inch of compression. They didn't say to what point, I'm supposed to get an email follow up.

Geiser... Never answers the phone when I call. I've tried twice (from a over seas phone number maybe they won't answer).

Anyone know factory spring rate? I've seen anything from 550-720

I read an interesting write up from an ICON guy, he was talking about spring rate. Its dated 2011 post number 107
https://www.fordraptorforum.com/threads/guys-with-icons.26745/page-11#post-520822