BC Suspension- RDX Coilovers

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Old Sep 5, 2014 | 10:49 AM
  #321  
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From: Moraga, CA
Simplyclean 44,

BC coilovers are good set up to go with for that slammed look (take a look at the Photobucket link I posted). They are around $1,000 new. Heel Toe and forum supported sells them. (Mine are sold to another forum member).

I am selling my wheels as well. PM me if you like the look.
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Old Sep 5, 2014 | 11:03 AM
  #322  
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Rotary are you selling your running boards? and if so would you ship them?
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Old Sep 20, 2014 | 05:39 PM
  #323  
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From: castle rock co
Where you get 1.75" bolts for rear
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Old Sep 20, 2014 | 10:20 PM
  #324  
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maybe im the first to mess up the install gotta see what code was set tomorrow but after installing the fronts im getting an abs/shawd/vsa light assist13. couldn't install the rears today my lower shock bolts are seized gonna have to cut them off :-(.


im thinking I messed up one of the abs sensor wires not sure they are both snugly in and not broke. hmmmm
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Old Sep 21, 2014 | 11:02 AM
  #325  
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was the bolt moving?? or is it the nut youre talking about?? cause some ot the nuts to the bolts are welded on and shouldnt move
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Old Sep 21, 2014 | 11:38 AM
  #326  
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definently messed up a sensor that has been confirmed.


ok so the rear bolt moves back and forth some but its seized beyond a certain point. pb all day didn't help, going to cut the bolts and try again.


now to get the twing sound to go away when steering :-(. gonna try to grease it up more.
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Old Sep 21, 2014 | 04:28 PM
  #327  
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Originally Posted by hypnotini
Where you get 1.75" bolts for rear
From my stock of nuts and bolts, but you should be able to get Metric bolts from Orchard or Ace.
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Old Sep 28, 2014 | 11:53 AM
  #328  
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From: castle rock co


this is mine lowered on the bc. ill post a pic of my alignment specs later but the -3.3 in the read is a lot ha ha, handles great though
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Old Sep 28, 2014 | 05:51 PM
  #329  
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From: tremont pa
Originally Posted by hypnotini


this is mine lowered on the bc. ill post a pic of my alignment specs later but the -3.3 in the read is a lot ha ha, handles great though
HEY you drive a brown one TOO do you notice that the speed nannies leave you alone as well I don't get to much grief from them.
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Old Sep 28, 2014 | 11:32 PM
  #330  
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From: castle rock co
Originally Posted by TheWrench116
HEY you drive a brown one TOO do you notice that the speed nannies leave you alone as well I don't get to much grief from them.

oh yeah its funny I go to the car meets and they never approach me....but since I have the cpe I made a nice recirc blow off sound in a parking garage and a cop chased down someone else rofl.
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Old Sep 29, 2014 | 07:50 AM
  #331  
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From: tremont pa
Originally Posted by hypnotini
oh yeah its funny I go to the car meets and they never approach me....but since I have the cpe I made a nice recirc blow off sound in a parking garage and a cop chased down someone else rofl.
its funny right? I still have the stock cat back and I'm at stock height so I get no looks until the next traffic light. then they are like wtf is that. I got some of those at the track the other night what is that what kind of motor is it stock? blah blah blah
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Old Sep 30, 2014 | 12:49 AM
  #332  
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yeah they don't expect it....had a guy demand to see my blow off rofl.
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Old Oct 8, 2014 | 12:22 AM
  #333  
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Carbon bronze pearl

Originally Posted by TheWrench116
HEY you drive a brown one TOO do you notice that the speed nannies leave you alone as well I don't get to much grief from them.
I knew I seen that color before, the color of your cars are Carbon Bronze Pearl.
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Old Mar 1, 2019 | 06:33 PM
  #334  
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Originally Posted by Rotary Rocket
BC Suspension- Installation of rear shocks and springs

1. Remove internal covers to expose top of rear shocks-- Access is through the trunk, use flat screw drive and pry off from the side and not top or bottom
2. Remove nuts completly (Deep 14mm socket)-- If stuck use 4mm allen and 14mm wrench
3. Jack up rear of car/remove wheels
4. Remove bottom shock bolt- 17mm rachet
5. Push body of shock up, move past suspension arm, remove shock
6. Use spring compressor (one inside spring towards center of car, one outside of spring towards the outside of car, see pics), take spring out
7. Remove bump stop 12mm socket with short extension
8. Install BC upper spring perch/height adjuster- Use 1.75 inch bolts instead of stock (I'll ask BC to include in final product)
9. Insert BC spring
10. Install BC shocks, tighten bottom bolt, jack up the suspension, tighen the top nut (BC uses 19mm nut)
11. Install wheels
12. Take car off jacks.

After putting the BCs on and taking them off, I learned that you can do without the spring compressor in step 6 if you slightly loosen the toe adjustment bolt and turn the cam bolt so the lower arm moves toward the center of the car and clears the knuckle. The lower arm will drop fully out of the way. It helps to place a jack underneath the arm so it doesn't fall.

Adjust the cam bolt during reinstallation to get the lower arm to knuckle bolt holes to line up again. A pry bar comes in handy.

For the front sway end links, both should be removed and installed at the same time so the bolt holes line up.
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Old Mar 8, 2019 | 08:13 PM
  #335  
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Thanks for the updated info, I have these installed as well. Check out my thread for pictures.
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Old Aug 13, 2020 | 08:10 PM
  #336  
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Finished the install on the fronts no problems (except seized sway bar link bolts on one side). Now need some guidance on the rear spring height adjustment installation. So I remove the stock bump stop and then need some help understanding how to install the spring/height adjuster.
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Old Aug 13, 2020 | 11:21 PM
  #337  
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How much stiffer than stick is this? My stock set up is stiff as all heck. LOL
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Old Aug 23, 2020 | 06:20 PM
  #338  
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Does even compare to stock makes stock feel like air suspension
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Old Aug 29, 2020 | 12:55 PM
  #339  
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Originally Posted by Midnight Mystery
How much stiffer than stick is this? My stock set up is stiff as all heck. LOL
Depends on the damper setting. They’re 30 way adjustable. On 1, they ride like an old caddy and feel like they’re underdamped for the spring rate, which aren’t that stiff off the shelf. On 30, they’re definitely stiffer than stock, like uncomfortable on the street. In the 15-20 range feels pretty close to the KYB/Eibach set up I had before the coil overs. 10-15 is pretty streetable/close to stock. I have RMs on the front, but I don’t think the shock dyno curve is any different between the BRs.
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Old Aug 29, 2020 | 01:37 PM
  #340  
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Originally Posted by Mr Hammond
Depends on the damper setting. They’re 30 way adjustable. On 1, they ride like an old caddy and feel like they’re underdamped for the spring rate, which aren’t that stiff off the shelf. On 30, they’re definitely stiffer than stock, like uncomfortable on the street. In the 15-20 range feels pretty close to the KYB/Eibach set up I had before the coil overs. 10-15 is pretty streetable/close to stock. I have RMs on the front, but I don’t think the shock dyno curve is any different between the BRs.
LOL. I forget they're adjustable. Sounds great!
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Old Sep 1, 2020 | 11:58 AM
  #341  
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Arrow

They have wrenches to adjust the ride height for each strut independently. Then they also have knobs to make each independent strut soft or hard dampening rate. Photo comparisons vs stock and installed photos of everything are available in my thread.
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Old Oct 13, 2025 | 08:07 PM
  #342  
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Figured I'd post in this thread to add some info for people looking to buy coilovers for their RDX.


I had planned on ordering the Megan Racing coilover setup for the RDX since I could get them at a discount with a coupon code. But when trying to order, I was informed that they were on backorder to 2ish months, and I wouldn't get them in time for the event I wanted them for. So I ended up ordering the BC coilover setup. You can read the specs on them on any of the multiple shops that sell them online. This post is my experience with them thus far, I can't compare them to any other brands that make a product for the RDX.


First off, I will say, BC has greatly upped their packaging game. I have helped friends install some years ago, and they were packaged like you would expect....each coilover wrapped, all in a box. These actually came in two boxes, a thick shipping box, and an inner prettier box. Each coilover was wrapped, with a ton of bagged foam peanuts placed strategically to keep everything in place during rough handling while in transit. The BC kit comes with everything you need....adjustment spanner wrenches, shorter front sway bar endlinks, and rubber bushings for the rear spring setup. The design of the components have been changed over the years compared to earlier variants, and I found them to be much beefier and utilizing thicker components than prior iterations.




Install wasn't anything particularly hard. Just make sure to not let the front knuckle drop and pop your axle joint apart (I did this and had to remove the axle and halfshaft to pop it back in). Front install is a breeze. The rear is also simple, but just takes a bit more time installing as the springs and shocks are separate. Setting the rear height takes a bit more time because of this.

Got everything installed, and got the height set to where I wanted it with my 19x9.5 +35 SSR GTX01s with 275/40 tires. Wheel fitment is great, I may try and and a 5-10mm spacer out back to get the fitment to match the front, but its not bad by any means.






The week after installing the coilovers I had the opportunity to take the RDX to the Tail Of The Dragon in TN/NC. I have taken it once before, with just my wheels and stock suspension. This trip I had the coilovers, and all my power-adding bolt-ons, so the experience was much more fun this time around. This gave me a good opportunity to test out the coilovers on a long highway drive, as well as on some tight and twisty roads.

On the highway, these BCs are phenomenal. They ride super smooth, much smoother than the worn factory suspension did. You can only tell its stiffer on really bad bumps. All the noises and clanking is gone. On the Dragon and twisty roads, I do wish the front was slightly stiffer. The coilovers came with 6k front and 12k rear spring rates. Ideally, an 8k rate up front would be the perfect compromise. A bit more stiffness without compromising ride quality. I currently have them adjusted about 2/3 stiff up front, and about 1/2 stiff in the rear. I do have a pair of 8k springs left over from a previous coilover setup, so I may install those in the future. This should let me soften the damping a bit as well, and keep a similar comfort level. I only rub very lightly on the front fender liners with my wheel/tire setup on large bumps. But its only on the plastic, and not anything metal.

I'd definitely recommend ordering your BCs with an 8k front spring setup (should be available at no extra cost if you use BC brand springs) if you can wait the bit of time it will take for them to assemble for you.



And an action shot via one of the photographers permanently setup at the Dragon. I'm pushing it pretty hard exiting this corner, and you can see the body roll is FAR less than stock.




Overall I'm extremely happy with my purchase, and handling should only improve with a front spring upgrade, and adding a Progress Technologies rear sway bar. Prior to the RDX, I messed around with 90s Hondas. This car will never be as nimble and tossable as one of those, but with the SH-AWD its still a blast to drive. Comfort is still there, while you gain a good amount of handling feel and lessened body roll.

Last edited by Corweena; Oct 13, 2025 at 08:10 PM.
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Old Oct 14, 2025 | 11:35 AM
  #343  
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I had the same experience with trying to order the Meagan kit first and it being backordered.

With the rear springs: did you re-use that small piece that holds the top of the spring (and its plastic seat) to the mounting point on the frame?

Asking because I didn't, figuring the weight of the car would keep the spring in place. But I get a very minor plastic-on-metal clunking or clattering noise when going over "lumpy" roads... I'm wondering if this is why. I did replace both plastic spring seats that sit between the springs and lower control arm.

How quiet is the suspension for you?
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Old Oct 16, 2025 | 03:49 PM
  #344  
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Originally Posted by EasyLoveRDX
I had the same experience with trying to order the Meagan kit first and it being backordered.

With the rear springs: did you re-use that small piece that holds the top of the spring (and its plastic seat) to the mounting point on the frame?

Asking because I didn't, figuring the weight of the car would keep the spring in place. But I get a very minor plastic-on-metal clunking or clattering noise when going over "lumpy" roads... I'm wondering if this is why. I did replace both plastic spring seats that sit between the springs and lower control arm.

How quiet is the suspension for you?
You definitely need to preload the rear springs.

You can't use the factory rubber upper spring isolator/centering piece. Its far to big for the sleeve of the BC coilover to fit over. But make sure you use the rubber piece that came with the BCs, that keeps the metal on metal grinding from happening. For the rear springs, I put about 10mm or so of tension, and then adjusted the shock height to line up with the control arm in that position. That way, at full extension, the shock is still holing a load on the springs.

Also, I would recommend adjusting the preload on the front springs as well. Mine came lightly preloaded, but after the springs settled for about a day, I noticed some significant noise from the front. The front springs were pretty much loose from the springs settling under the weight of the car. I re-did the preload to 10mm, and it has been much better since.
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Old Oct 17, 2025 | 11:33 AM
  #345  
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The upper spring seats I got are plastic, not rubber. I bet that's why I'm getting the clunk.

If it doesn't indicate a problem I'm fine with it, the noise itself doesn't bother me... I guess I'm just sensitive to noises after replacing basically everything suspension & steering-related in the front end.
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