Plushest riding Spring...

[Rock Krawler Suspension]

Does your 2.5" lift the front higher to delete factory rake?

Absolutely, it does!

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[MikeJLUR]

Anyone make a 1.5 lift for JLUR? Complete system?

 

[maaark]

Our spring rates are listed on their product pages as well.
https://www.synergymfg.com/synergy-jeep-jl-jlu-front-lift-coil-springs.html
https://www.synergymfg.com/synergy-jeep-jl-jlu-rear-lift-coil-springs.html

It's awesome you post this information. For those of us who meticulously evaluate all of our upgrades prior to making any decisions/purchases this saves so much time not having to call or email manufacturers to get these specs.

 

[RubiRob]

I've been looking into spring rates a little bit now and here's what I've read:

Front / Rear

JLU Sport : 117 / 172
JLU Rubi : 125 / 174
Mopar lift : 132 / 181
Synergy : 120
Teraflex : 140
RK 2.5 : 137 / 175
RK 3.5 : 140 / 185
EVO Soft : they wouldn't tell me

 

[AllJumpStyle]

Synergy primary rates are 120 front and 175 rear except for the 2-door 2" springs which are 150 rear.

 

[RubiRob]

Synergy primary rates are 120 front and 175 rear except for the 2-door 2" springs which are 150 rear.

Sorry I just averaged the two numbers you have on the website 110/120

 

[AllJumpStyle]

Got it. Averaging the numbers for multi-rate springs is not correct. The spring's ride rate, the rate that actually matters while you're driving, is the primary rate and for your intents and purposes, is what I would recommend using. The initial rate is softer and allows us to get a longer free length, but this rate is not what is being used while driving.

 

[RubiRob]

Got it. Averaging the numbers for multi-rate springs is not correct. The spring's ride rate, the rate that actually matters while you're driving, is the primary rate and for your intents and purposes, is what I would recommend using. The initial rate is softer and allows us to get a longer free length, but this rate is not what is being used while driving.

Fair enough, just trying to figure out the numbers. Thank you for being one of the few that actually post rates.

 

[cmb396]

Got it. Averaging the numbers for multi-rate springs is not correct. The spring's ride rate, the rate that actually matters while you're driving, is the primary rate and for your intents and purposes, is what I would recommend using. The initial rate is softer and allows us to get a longer free length, but this rate is not what is being used while driving.

So, I would be interested in your 3" springs, I don't feel 2" would give me the lift I need for the 37's I am currently running. Do the 3" yield a true 3" front and rear, or are the rears shorter to compensate for rake?

How will they work with Falcon 3.3s?

 

[AllJumpStyle]

Of course. I just want to make sure you are comparing apples to apples. Springs can get complicated very quickly.

Most dual rate setups sit in the primary rate at ride height, but it really depends on how the springs are designed. Having a spring change spring rates substantially throughout the travel is not ideal unless you have a position sensitive shock matched to it (bypass shocks for example). Well-tuned shocks are tuned to the spring rate, so if the spring rate changes, the shock's tune will only be matched to it through some of the travel and not through the rest. Most of this comes down to getting every last bit of performance out of the system, but it will affect how the ride feels and how predictable the vehicle is as well. Most pay more attention to compression damping, but rebound damping is just as important, if not more important, to ride quality and where a large change in spring rate can really unsettle a vehicle.

 

[AllJumpStyle]

So, I would be interested in your 3" springs, I don't feel 2" would give me the lift I need for the 37's I am currently running. Do the 3" yield a true 3" front and rear, or are the rears shorter to compensate for rake?

How will they work with Falcon 3.3s?

We included a LOT of information on our coil spring product pages to try and answer most of these questions plus provide some additional insight into why we did what we did.

Our advertised lift heights are based on a loaded Rubicon model. If you have one of these, you will get the lift height stated. If you have a non-Rubicon or a lighter build package, you will get more lift.

We keep the stock rake of the vehicle (based on the Rubicon) to retain load-carrying capacity. If you want the vehicle to sit level, coil spacers can be added to the front.

 

[AllJumpStyle]

How will they work with Falcon 3.3s?

I don't love the Falcon 3.3's because their low-speed damping is too aggressive for me. We have one of the lighter spring rates out there, so if anything, they probably ride better with our springs than most others.

 

[Alanscott1]

I don't love the Falcon 3.3's because their low-speed damping is too aggressive for me. We have one of the lighter spring rates out there, so if anything, they probably ride better with our springs than most others.

I’ve inquired with @TeraFlex today to see if I can get mine revalved for just the reason you mentioned above. I have a lighter JLR and the low speed compression damping is brutal.

 

[cmb396]

I’ve inquired with @TeraFlex today to see if I can get mine revalved for just the reason you mentioned above. I have a lighter JLR and the low speed compression damping is brutal.

Please post back with what they say! I would entertain doing this, as I agree. Anything under 20mph is very harsh!

I don't love the Falcon 3.3's because their low-speed damping is too aggressive for me. We have one of the lighter spring rates out there, so if anything, they probably ride better with our springs than most others.

Agree on the low speed dampening.
Which spring would you recommend for me? Factory steel bumpers with winch. Rear tire delete, so no a lot of weight from add ons.
I have 2.5” spacers right now, exactly 2.5” over factory JLUR height, and would like more clearance for the 37s while wheeling.

 

[AllJumpStyle]

Please post back with what they say! I would entertain doing this, as I agree. Anything under 20mph is very harsh!


Agree on the low speed dampening.
Which spring would you recommend for me? Factory steel bumpers with winch. Rear tire delete, so no a lot of weight from add ons.
I have 2.5” spacers right now, exactly 2.5” over factory JLUR height, and would like more clearance for the 37s while wheeling.

Without knowing what else you are running suspension-wise, it is hard to say. 37's will fit with 2" springs and 2" bump stop spacers with high clearance fenders. If you want 3" springs, I would make sure you have the supporting components which come with most quality 3" suspension systems. We don't have our Stage 1-3 systems out yet, but they are coming soon and include everything required for 2" or 3" of lift.

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