I have had my RCD lift installed for approximately 1 month now. I have noticed that over that month, the front of the truck has gradually dropped and the ride quality has steadily decreased. I am now practically sitting on my bump stops (ok, I am about a millimeter off of each one). The coil adjusters are cranked down to within a 1/2 inch of the end of the threads. When I measure the coils with the truck on level ground, they measure approximately 9". So... I am in the market for new springs. I know that I need a 12" long, 2.5" ID spring that has a rating of greater than 600#'s. It seems that most of the people that have posted on this issue have chosen to run the Hypercoils over the Eibach's. Is this because of color, price or performance?

For any of you that have made this modification to you RCD kit, which coil did you choose, why did you choose the brand and weight, and after making the swap how has it performed?

FWIW, I am frustrated with RCD and am not too pleased that their response was basically it is what it is. That being said, please do not hijack this thread and turn it into a Superlift vs. RCD discussion.

 

Ive never heard any substantial arguement why one is better than the other and Ive seen various groups swear by both...

 

750lb hypercoils.

 

How have you liked the 750# coils. I was thinking about going with 700# coils. How much preload did you have to run to get the truck to sit level?

 

i have #800lb hypercoils and they are still as a mother****er, but they have not sagged any at all. i like them, wish i would of went with the 750 thought

 

Trevor(TrePaul86) is RCD'd. And within the first 5k on his kit, the 600lb stockers were worn down, rather, they "settled". Basically he was also riding on his bumpstops. He upgraded to 750lb Hypercoils, and the truck rides beautiful. He's had maybe 1500 miles on them so far, and have noticed no "settling" of the springs.

I drove it as well...and it rides great.

 

Wow you guys are using some heavy springs! How do you stand the ride? I'm using 600lbs springs and I think mine is a little stiff...

 

Part of it may be that the RCD Bilstein shocks only use a 12" coil. With such a short coil, there is not much room for preload on such a light weight coil. I guess a 600# coil might be ok if the coil was prestressed and would not sag over time. I liked the ride quality when the spring was new but now it is horrible.

 

Adding preload just increases the rate. Ideally you want as little spring as is necessary to hold the vehicle at ride hight with zero preload.

That said mine have about 1/2" of preload in them, and that was just to make them fit the shock...

 

you have alot of extra width, and im sure you coil overs are are packaged in a way that utilizes the extra width and better geometry.

i ran 750# hypercoils and the rate was ok. i would have preferred 700's, but my supplier was out of stock and i was impatient.

 

My 600# coils are definately inadequate based on rngprerunners criterion. I have 3" of preload on my coils and am still riding on my bump stops. BTW, don't you have to have enough preload on the spring to allow for droop travel? I would assume that would be necessary to keep the spring seated in all conditions.

 

For the 3.0L I have I think the 750lb springs are a bit much, the 700s would probably be a little better. The 750s still ride nice though. I have the coils cranked about halfway down the shock body, but they haven't sagged a bit like the ones the come with the kit are notorious for.

 

Yup, you're right... I have more leverage on them, which would mean I would need a heavier coil for the same result on a stock truck...

I'm not saying it's wrong, it just baffles me how you guys are running such a heavy coil on that kit and not having your truck ride like complete ***...

 

jason my truck rides like complete *** with the 800s but still better than stock

 

My problem is that with my lower control arms resting on the bump stops even 800# coils would be an improvement. The bump stops are keeping me from having any up travel. I would be fine with the 600# springs if they were supporting the truck. More than likely the springs provided by Bilstein are just cheep crap and are not up to the same level of quality that you would get if you were doing a custom installation with Kings and or Fox shocks. Thanks for everyone's input.

 

I got 750Lbs coils..... They look cool, havent installed them yet but when i do, ill let you know!

 

Question: Why does RCD even give you those springs with such a low rate to start with?

 

Good question... 750lbs with our engines seems like the perfect fit. When the spring starts to settle(sag) a bit, you can always crank the spring up a tad to go back to normal.

 

i havent really gotten a close look at a DBR truck, but i would have imagined the C/O would be placed closer to the wheel than OEM thus requiring less spring to provide the same wheel rate. got any low angle, straight on pics of the front end?

the RCD locates the C/O in the same position as the factory shock, only about halfway down the LCA... sucks for spring rate and bushing bind, but its the only packaging option w/o custom arms