3.5 RK progressive springs to a linear spring - Jeep Wrangler Forum

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Old 06-04-2014, 11:10 AM   #1
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3.5 RK progressive springs to a linear spring

I have run my RK 3.5 progressive springs for nearly two years now on a pretty light weight rig. No fenders, no spare, no top, very minimal rear bumper. I netted probably around 4-5 inches and I was pretty happy with the ride.

Now as I'm leaning more towards an overland rig I have added tire carrier, spare, roof rack, full MC fender setup, winch, Roof Top Tent... So I have certainly changed the characteristics of my ride as far as "sprung weight" is concerned. While the ride has softened up a bit I think I am now riding on some weird transition point where the tighter portion of the spring turns to a more loose coil. So now I am getting a very irritating groaning when my suspension cycles.

I am thinking about switching to a 5" linear spring. Thinking maybe Evo Plushrides, RK 5" linear, or maybe the curries.

Any thoughts on the groaning (almost positive it's from the coils), Or anyone go from progressive to linear or duel rate springs?

*as it may come up... The full setup is a full set of RK mid arms, Fox JK tuned 4"-6" Resi shocks, and a Currie Antirock.

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Old 06-04-2014, 11:47 AM   #2
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*Edit* The height is not really the concern as much as getting a better riding coil for the amount of weight I am running. With the added weight up top I am aware of the raised center of gravity, so I may not need a true 5" but I want to make sure when I get new coils they at least keep me in the 3.5" to 4" realm to keep this belly over the rocks.

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Old 06-04-2014, 01:06 PM   #3
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The RK coils are a well designed set of coils so I'm surprised you are having ride quality issues.

The progressive spring rate coils are ideally suited for overland travel particularly as speed increases (within reason) over rough terrain. If you are concerned with ride quality the linear coils will not improve it consistently across a range of terrain and speed. They will provide good performance but not consistent ride quality.

The EVO coils are a great choice as well as the AEV 4.5. AEV suspension is optimized for overland travel which inherently means heavier Jeeps.
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Old 06-04-2014, 01:09 PM   #4
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2nd gen RK coils are progressive front and linear rear.
They are now triple rate front and rear.
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Old 06-04-2014, 03:58 PM   #5
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Quote:
Originally Posted by spinlock View Post
The RK coils are a well designed set of coils so I'm surprised you are having ride quality issues.

The progressive spring rate coils are ideally suited for overland travel particularly as speed increases (within reason) over rough terrain. If you are concerned with ride quality the linear coils will not improve it consistently across a range of terrain and speed. They will provide good performance but not consistent ride quality.

The EVO coils are a great choice as well as the AEV 4.5. AEV suspension is optimized for overland travel which inherently means heavier Jeeps.

It's not a ride quality issue as much as the groaning I am now getting from my rear coils. The ride is pretty nice now actually.

KJeeper, that's a good point. Now that I think about it, I'm thinking I may be on the older gen coils in which I am already on linear coils out back. Maybe a switch to the new triple rate 3.5" coils would suit my needs.
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Old 06-04-2014, 04:05 PM   #6
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Big difference. The fronts are softer as well. I went from gen 2 to 3 on a 2 door. Love the new coils.

Oh .. There's still a market for gen 2's
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Old 06-04-2014, 04:18 PM   #7
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Not to high jack this thread...but can someone explain, progressive rate, triple rate etc?

And where do my Rubicon Express 3.5" springs fall into this? My ride is pretty good, but I bet it could be better.
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Old 06-04-2014, 05:05 PM   #8
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Coils are tough to explain. Somebody can explain better then I can.

Triple rate, dual rate are both a form of progressive coil. The rates change progressively through the length of the coil. Some transition, some have set rates each zone.
Linear coils are a set rate through the coil.

You can tell a progressive coil by the winds. They are not the same throughout the coil. RK's have a dead zone, soft zone (street), a transition and then firm rate.
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Old 06-04-2014, 05:14 PM   #9
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This is I think a MC dual rate and stock coil

What maters most for ride is the rating of the soft area of the coil. Iirc RK's is 175 lbs/in
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