[mindovaanything]

From my understanding a rck corrects the suspension geometry & alignment on lowered cars. My question is how much lower than stock before the rck is needed/helpful?
I'm not sure if I've got this whole thing figured out just right and trying to decide how much benefit/need there is for me to get a rck. My thinking is that a rck on a car with stock height or close to stock height wouldn't be beneficial.

FYI I've got works springs so my car is .9inches lower than stock.

 

[Stark Industries]

well, you can either buy the tie rods and bushings for 200 bucks, or... you can wait til the inner wall of your tires is bald and pay a grand for 4 new tires.
If you really want to get an expert's opinion just call up whiteline and ask bud.

 

[SiliconTek]

I am lowered to 25" from fender to floor all the way around and my roll center is just now where it could benefit from a RCK, if I was tracking it. When I was lowered 1" from stock the a-arms were still parallel and sitting nice. If you only dropped .9" you should be fine.

You can call up a crack dealer and ask if he really thinks you need crack, I bet he will always say yes. :shades:

 

[Stark Industries]

good thing not every honest parts company sells crack.

 

[SiliconTek]

good thing not every honest parts company sells crack.

Do you honestly think if you called Whiteline up and said, "Hey, I have a lowered car, do I need a RCK?", they would say no?

 

[Stark Industries]

Ive asked other parts companies that had nothing to lose and they told me not to buy their parts until I met XX requirements. Just saying, its not like EVERYONE in the world is out to con you.

 

[SiliconTek]

Ive asked other parts companies that had nothing to lose and they told me not to buy their parts until I met XX requirements. Just saying, its not like EVERYONE in the world is out to con you.

I can agree with that. But with suspension there are many variables and there isn't really a cookie cutter configuration. Lowered with -1 camber, -2 camber, -3 camber, not lowered with the same, etc. My suspension shop wouldn't even tell me over the phone, they insisted on taking a look and measuring the suspension to find out if I needed it. You can actually visually see if you need it or not with the car on a lift.

 

[Stark Industries]

I went ahead and installed it with the Ohlins just for the hell of it. But the drop was significant from stock.

 

[verkion]

I think I've posted about the need for RCKs a million and a half times already. The short answer everyone gives is if it is less than a certain drop, it isn't needed. That is, technically, correct, but adding an RCK will reduce the Roll Couple which = GOOD = better steering transitions. This in particular, would help auto-x'ers or people on tracks with lots of transitions. I suppose if you're "NASCAR'ing", i.e. going in a circle one way the whole time, you might even want to increase the Roll Couple to help it lean one way...

If you want a more detailed explanation, I'll write it up again/dig up my old posts. Its really just some basic math/physics. I knew practically nothing about suspension geometry until people kept talking/asking about RCKs and so I went to find out and spent some time modelling it in some CAD/CAM software just to horse around. That said, at the end of the day, I suspect most people would be better off with $200 worth of driving instruction than $200 worth of RCK.

verkion

 

[mindovaanything]

thanks for the input guys, I'll be holding off on the rck until I'm getting coilovers, which won't be for a while. I've got a bunch of other mods planned before coils and driver mod (performance driving class at infineon is pretty high up on that list)

 

[jeffthter]

anything lower than stock, and a Roll center adjustment helps

 

[bigstakk]

RCK will help some even on .9" lowered but the "general" rule of thumb from my research is anything more than 1" would need it...

Side note...I have been looking into potentially getting some Works springs -How do you like them compared to stock? I love my Eibach springs but they are a little low for where I live (LA -which has crappy bumpy streets everywhere). Do you feel they handle better than stock, take bumps well and are overall smooth ride wise? Thanks and sorry to go off topic, it's just been hard to find people with these springs...

 

[mindovaanything]

I love the springs, I think the ride feels firm, and solid but isn't excessively stiff or anything. Very comfortable on highway cruising. Over bumps and rougher roads I really couldn't complain at all, I generally enjoy the stiffer somewhat bumpy/sporty feel in cars though. I bought the car with springs so I can't compare to stock and have also only gotten to spend two days with approx 300 miles of seat time in my car.

My EVO compared to the overall ride in a range from luxury suv's to gutted track cars I say this falls just a bit to the sportier side of dead center, great for DD soft & smooth enough for long trips yet you can totally feel the road, it's sporty & responsive, feels incredibly solid & planted on lane changes and through windy mountain roads, but thats more of my impression of the whole car vs just the springs since I don't have much other experience with EVOs aside from test driving new ones at the dealership. I really don't think that the ride is significantly rougher than stock but I could be wrong.

The height is great, I really don't understand how people drive around with their cars any lower especially for a DD, although I still managed to scrape my lip at a gas station exit.

I guess everyone's taste & tolerance is different, I want to ride along in some other evo's and see what some coilover setups feel like, sometimes I think I want them and other times I'm like why mess with a good thing and I don't think I'd be happy DD anything stiffer.

 

[MPofficer]

Is whiteline the only guys that make an RCK?

 

[bigstakk]

I love the springs, I think the ride feels firm, and solid but isn't excessively stiff or anything. Very comfortable on highway cruising. Over bumps and rougher roads I really couldn't complain at all, I generally enjoy the stiffer somewhat bumpy/sporty feel in cars though. I bought the car with springs so I can't compare to stock and have also only gotten to spend two days with approx 300 miles of seat time in my car.

My EVO compared to the overall ride in a range from luxury suv's to gutted track cars I say this falls just a bit to the sportier side of dead center, great for DD soft & smooth enough for long trips yet you can totally feel the road, it's sporty & responsive, feels incredibly solid & planted on lane changes and through windy mountain roads, but thats more of my impression of the whole car vs just the springs since I don't have much other experience with EVOs aside from test driving new ones at the dealership. I really don't think that the ride is significantly rougher than stock but I could be wrong.

The height is great, I really don't understand how people drive around with their cars any lower especially for a DD, although I still managed to scrape my lip at a gas station exit.

I guess everyone's taste & tolerance is different, I want to ride along in some other evo's and see what some coilover setups feel like, sometimes I think I want them and other times I'm like why mess with a good thing and I don't think I'd be happy DD anything stiffer.

Thanks for the review...thinking about getting these springs still.

 

[laksman91]

Is whiteline the only guys that make an RCK?

Nope, Moonface Japan does as well

 

[waltezee]

Also AMS makes a set to.

 

[Jkapinos]

Also AMS makes a set to.

I installed the whiteline RCK and without ever driving my car AMS released there's so now I have both. It sucks to install something to just have to change it before it done. But what can you do.

 

[waltezee]

Just out of curiosity why did you swap out the Whitelines which were already installed with the AMS RCK?

 

[Jkapinos]

Just out of curiosity why did you swap out the Whitelines which were already installed with the AMS RCK?

The AMS is adjustable and a better kit for the track. Since my car is 90% race car I felt it was a big improvement. I got both front parts as well as the rear. But it is ungodly exspensive. Look on the AMS web site and you will see what I mean. It comes with I think four different spacers.