BC Coilovers Question

Fairlady_Zeto · 10-22-2016, 01:53 PM

Hey so im starting to get really frustrated with my coilovers (BC BR). They arent anything special just ordered as they come (Mistake).I have found that i cant get high enough in the rear even when they are adjusted all the way up, it sits way too low and as soon as i start moving its dips down even further. (Am i doing something wrong?) Because the rear is where it is the front is slammed to prevent getting a reverse raked look (front up rear down) which causes the car to feel like **** and would look terrible. Ive done some research and found that the BC stock spring rates are 10k Front 8k Rear. Stocks are 7.5k front and 8.1k rear. In discovering this i realize thats part of my problem already, softer than stock springs in the rear. My question is if i get 10k rear springs that are maybe slightly longer will that through off the geometry in a negative way or would that completely fix my problem? Background info, 370z base with just the bc's no other suspension mods. They have maybe around 10-15k miles on them. Any input would be greatly appreciated

PJ23 · 10-22-2016, 01:58 PM

Do you have the rear springs installed correctly? I had BCs on my G35 with the extreme drop and could still have it to within a 1/2inch of stock height.

cv129 · 10-22-2016, 04:02 PM

I think, for better reference, could you take a picture and measurements on just how low it is now?

Side note: are the BC ER rears the "true type" (coil spring over the shock, instead of separate like OEM)? If "true type", you can't compare spring rate directly. And 0.1 kg/mm difference isn't going to cause dramatic difference in height anyway.

Fairlady_Zeto · 10-22-2016, 05:54 PM

Quote:

Originally Posted by PJ23

Do you have the rear springs installed correctly? I had BCs on my G35 with the extreme drop and could still have it to within a 1/2inch of stock height.

They only fit on the car one way because you have to seat it in the spring mount.. Thats what i thought my spring might be but now im not so sure.

Fairlady_Zeto · 10-22-2016, 06:01 PM

Quote:

Originally Posted by cv129

I think, for better reference, could you take a picture and measurements on just how low it is now?

Side note: are the BC ER rears the "true type" (coil spring over the shock, instead of separate like OEM)? If "true type", you can't compare spring rate directly. And 0.1 kg/mm difference isn't going to cause dramatic difference in height anyway.

Yeah ill take a pic and measurement of the drop specifically when i get home today.. Mine are the BR type or OEM style. I know the difference in rates wont cause a huge difference in height but at such a low rate and already being lowered once there is power being put down it sqauts too hard causing the rear to dip lower than id like.

Zoren 370 · 10-22-2016, 07:26 PM

The rear springs have a perch ring adjustment to compress the spring and push your rear upwards. You need to adjust both the spring perch and the strut adjustment to lift or lower the car in the rear. Since yours is not a true type of coils.

Zoren 370 · 10-22-2016, 07:43 PM

Zoren 370 · 10-22-2016, 07:44 PM

You need to preload the spring watch the video. Hope this helps.

Fairlady_Zeto · 10-22-2016, 08:22 PM

Quote:

Originally Posted by Zoren 370

You need to preload the spring watch the video. Hope this helps.

Ok so the strut does adjust height as well? I was told (maybe incorrectly) that only the spring is used to adjust height and the strut is for preload adjustments only. Them working hand in hand does make more sense though after watching the video. This is the first time ive done full coilovers (on a Z), my other ones i just went spring and strut combo (so much easier) lol

sandersd · 10-23-2016, 11:09 AM

I installed BC coil overs on my car. Maybe this will help?

BC ER, SPL Install and Adjust

Fairlady_Zeto · 10-23-2016, 01:40 PM

Quote:

Originally Posted by sandersd

I installed BC coil overs on my car. Maybe this will help?

BC ER, SPL Install and Adjust

Yeah it did thanks.. This wednesday im going to go back in and preload the springs and see if that helps with the adjustment issue. Ill check back in once its done to update you guys.. I appreciate everyones help REP POINTS!

Fairlady_Zeto · 10-28-2016, 12:34 PM

So this next wednesday now

My buddy with a garage flaked on letting me use it.. I HATE living in an apartment complex!.. Ill check back in after its done regardless of when i get a chance. To Be Continued.......

Fairlady_Zeto · 12-02-2016, 12:59 PM

Finally got around to adjusting (properly) and it definitely did fix the issues i was having.. still low at the highest setting but at least now its exactly where i want it.. Big thanks to Zoren 370 & sandersd for providing their assistance rep to you!

Jhill · 12-02-2016, 05:18 PM

Hmm looks like I need to add a little preload to my rear on my powertrix. Been feeling good but just a slight bit of noise over speed bumps. I just threaded the shock bodies up until all spring play was gone but didn't actually preload it and I too am a bit lower than I had anticipated for how high I set the collars (also not exactly even side to side). Going to do one more final adjustment Sunday before track event on Monday. Going to be a little harder to measure my exact spring compression since it still uses the oem seat but I'll get it close.

teggy · 12-02-2016, 06:14 PM

simple question so you can adjust the front without having too touch the preload again, but the back anytime you make an adjustment the preload has too be adjusted again?

10-22-2016, 01:53 PM	#1 (permalink)
Fairlady_Zeto Base Member Join Date: Nov 2015 Location: Walnut Creek, CA. Posts: 101 Drives: 09-370Z-PG-6MT Rep Power: 10	BC Coilovers Question Hey so im starting to get really frustrated with my coilovers (BC BR). They arent anything special just ordered as they come (Mistake).I have found that i cant get high enough in the rear even when they are adjusted all the way up, it sits way too low and as soon as i start moving its dips down even further. (Am i doing something wrong?) Because the rear is where it is the front is slammed to prevent getting a reverse raked look (front up rear down) which causes the car to feel like **** and would look terrible. Ive done some research and found that the BC stock spring rates are 10k Front 8k Rear. Stocks are 7.5k front and 8.1k rear. In discovering this i realize thats part of my problem already, softer than stock springs in the rear. My question is if i get 10k rear springs that are maybe slightly longer will that through off the geometry in a negative way or would that completely fix my problem? Background info, 370z base with just the bc's no other suspension mods. They have maybe around 10-15k miles on them. Any input would be greatly appreciated

10-22-2016, 04:02 PM	#3 (permalink)
cv129 A True Z Fanatic Join Date: Jul 2011 Location: Dallas, TX Posts: 3,246 Drives: 09 Nismo, 16 Nismo Rep Power: 163995	I think, for better reference, could you take a picture and measurements on just how low it is now? Side note: are the BC ER rears the "true type" (coil spring over the shock, instead of separate like OEM)? If "true type", you can't compare spring rate directly. And 0.1 kg/mm difference isn't going to cause dramatic difference in height anyway. __________________ Setrab \| RE-71 \| SPL \| JRZ \| Nismo \| ARK \| Whiteline \| RacingBrake \| CJM Oil Pan \| Ti shield

10-22-2016, 07:26 PM	#6 (permalink)
Zoren 370 A True Z Fanatic Join Date: Mar 2012 Location: FL Posts: 11,018 Drives: 11 Nissan 370 M6 Rep Power: 1913653	The rear springs have a perch ring adjustment to compress the spring and push your rear upwards. You need to adjust both the spring perch and the strut adjustment to lift or lower the car in the rear. Since yours is not a true type of coils. Smokey Nagata likes this.

10-23-2016, 11:09 AM	#10 (permalink)
sandersd Enthusiast Member Join Date: May 2014 Location: Houston, TX, USA Posts: 280 Drives: 2014 370z Nismo Rep Power: 11	I installed BC coil overs on my car. Maybe this will help? BC ER, SPL Install and Adjust __________________ 2014 370Z NISMO -- HKS Hi-Power Exhaust -- Swift Springs -- BC ER Coilovers -- SPL Suspension Components -- Nismo R-Tune Intake -- Seibon BD CF Hood

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10-22-2016, 01:58 PM	#2 (permalink)
PJ23 Base Member Join Date: Sep 2016 Location: Kentarolina Posts: 67 Drives: 370z Rep Power: 9	Do you have the rear springs installed correctly? I had BCs on my G35 with the extreme drop and could still have it to within a 1/2inch of stock height.

10-22-2016, 07:43 PM	#7 (permalink)
Zoren 370 A True Z Fanatic Join Date: Mar 2012 Location: FL Posts: 11,018 Drives: 11 Nissan 370 M6 Rep Power: 1913653

10-22-2016, 07:44 PM	#8 (permalink)
Zoren 370 A True Z Fanatic Join Date: Mar 2012 Location: FL Posts: 11,018 Drives: 11 Nissan 370 M6 Rep Power: 1913653	You need to preload the spring watch the video. Hope this helps.

10-28-2016, 12:34 PM	#12 (permalink)
Fairlady_Zeto Base Member Join Date: Nov 2015 Location: Walnut Creek, CA. Posts: 101 Drives: 09-370Z-PG-6MT Rep Power: 10	So this next wednesday now My buddy with a garage flaked on letting me use it.. I HATE living in an apartment complex!.. Ill check back in after its done regardless of when i get a chance. To Be Continued.......

12-02-2016, 12:59 PM	#13 (permalink)
Fairlady_Zeto Base Member Join Date: Nov 2015 Location: Walnut Creek, CA. Posts: 101 Drives: 09-370Z-PG-6MT Rep Power: 10	Finally got around to adjusting (properly) and it definitely did fix the issues i was having.. still low at the highest setting but at least now its exactly where i want it.. Big thanks to Zoren 370 & sandersd for providing their assistance rep to you!

12-02-2016, 05:18 PM	#14 (permalink)
Jhill Track Member Join Date: Mar 2016 Location: San jose Posts: 854 Drives: 2013 370z sport Rep Power: 3384	Hmm looks like I need to add a little preload to my rear on my powertrix. Been feeling good but just a slight bit of noise over speed bumps. I just threaded the shock bodies up until all spring play was gone but didn't actually preload it and I too am a bit lower than I had anticipated for how high I set the collars (also not exactly even side to side). Going to do one more final adjustment Sunday before track event on Monday. Going to be a little harder to measure my exact spring compression since it still uses the oem seat but I'll get it close.

12-02-2016, 06:14 PM	#15 (permalink)
teggy Base Member Join Date: Mar 2012 Location: canada Posts: 126 Drives: 06 350z track Rep Power: 13	simple question so you can adjust the front without having too touch the preload again, but the back anytime you make an adjustment the preload has too be adjusted again?