What Rate Springs With BC BR Coils?

Hybrids · 09-05-2021, 07:45 PM

Looking into getting the BC BR coilovers for my car. Not sure what rate springs I should get. They have 10-16k for the fronts and 8-14k for the rear. I am only looking to lower the car to get flush fitment and still have a good riding car i can drive on a trip if needed without beating myself to death in it.

Spooler · 09-10-2021, 10:43 AM

Are you going to stick with the factory Divorced setup in the rear or are you going true type coilovers in the rear?

1cleans13 · 10-07-2021, 11:14 AM

Quote:

Originally Posted by Spooler

Are you going to stick with the factory Divorced setup in the rear or are you going true type coilovers in the rear?

It have a question about that "Divorced" setup. If I go that route, are there
additional parts I need to purchase? Or is the area where the coil is currently
just stays empty? Sorry I am not familiar with it.

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cv129 · 10-07-2021, 11:44 AM

Quote:

Originally Posted by 1cleans13

It have a question about that "Divorced" setup. If I go that route, are there
additional parts I need to purchase? Or is the area where the coil is currently
just stays empty? Sorry I am not familiar with it.

Sent from my iPhone using Tapatalk

"Divorced" = spring and shocks mounted at different spot. Our OEM rear is divorced setup.

"True type" = the coil-spring surrounding the shocks, mounted as one unit. OEM front is this setup.

See pictures from a member's FS thread. Also how the oem rear suspension looks (from Edmunds.com). See the spring and shock are at different spot.

If one goes for the "true type" rears, then the spring would be mounted on the shock. That big spring bucket will just hold air.

Of course, one should have adjustable arms if switching to aftermarket spring and shocks.

abm89 · 10-07-2021, 11:44 AM

The spring buckets are replaced by toe arms.

abm89 · 10-07-2021, 11:45 AM

nvm, i got beat to the info.

1cleans13 · 10-07-2021, 12:47 PM

Quote:

Originally Posted by cv129

"Divorced" = spring and shocks mounted at different spot. Our OEM rear is divorced setup.

"True type" = the coil-spring surrounding the shocks, mounted as one unit. OEM front is this setup.

See pictures from a member's FS thread. Also how the oem rear suspension looks (from Edmunds.com). See the spring and shock are at different spot.

If one goes for the "true type" rears, then the spring would be mounted on the shock. That big spring bucket will just hold air.

Of course, one should have adjustable arms if switching to aftermarket spring and shocks.

WoW
Thank you for all the info. I am getting BC coilovers (true type) And I am thinking of picking up Z1 adjustable arm kit they offer. I barely drive the car and only drive it occasionally on weekends so I don’t see the point in spending thousands $$$$ on super high quality arms.
As much as i would love to.

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1cleans13 · 10-07-2021, 12:54 PM

Quote:

Originally Posted by cv129

"Divorced" = spring and shocks mounted at different spot. Our OEM rear is divorced setup.

"True type" = the coil-spring surrounding the shocks, mounted as one unit. OEM front is this setup.

See pictures from a member's FS thread. Also how the oem rear suspension looks (from Edmunds.com). See the spring and shock are at different spot.

If one goes for the "true type" rears, then the spring would be mounted on the shock. That big spring bucket will just hold air.

Of course, one should have adjustable arms if switching to aftermarket spring and shocks.

Another question,
In the picture with the standard oem set up(rear) what’s the name of the arm below, attached to the knuckle? I know i replaced it some years ago with an spl arm (before they were too expensive lol. maybe i could get away with keeping and not having to change those

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Evildky · 10-07-2021, 01:39 PM

What do you plan to do wiht the car? If you autocross or track the car you'll want much higher rates than a commuter car.

1cleans13 · 10-07-2021, 01:48 PM

Quote:

Originally Posted by Evildky

What do you plan to do wiht the car? If you autocross or track the car you'll want much higher rates than a commuter car.

Is mostly a street driven car on some weekends. If one day I decide to track it then I would reconsider the suspension set up.

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JARblue · 10-07-2021, 02:03 PM

Quote:

Originally Posted by 1cleans13

Another question,
In the picture with the standard oem set up(rear) what’s the name of the arm below, attached to the knuckle? I know i replaced it some years ago with an spl arm (before they were too expensive lol. maybe i could get away with keeping and not having to change those

Are you talking about the spring bucket? That is called the rear toe midlink. It should be replaced with adjustable toe arms if you go to a true-type coilover. See Posts #4 and #5.

Spring Bucket or Toe Midlinks for divorced-style (OEM) suspension:

( Click to show/hide )

Adjustable Toe Arms for true-type coilovers:

( Click to show/hide )

Evildky · 10-08-2021, 03:13 PM

Quote:

Originally Posted by 1cleans13

Is mostly a street driven car on some weekends. If one day I decide to track it then I would reconsider the suspension set up.

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Then you want softer springs. Stock rates are 392lb (7.1k) F, 441lb (7.9k)R.

09-05-2021, 07:45 PM	#1 (permalink)
Hybrids Base Member Join Date: Mar 2021 Location: USA Posts: 22 Drives: 2009 370z 6MT Rep Power: 4	What Rate Springs With BC BR Coils? Looking into getting the BC BR coilovers for my car. Not sure what rate springs I should get. They have 10-16k for the fronts and 8-14k for the rear. I am only looking to lower the car to get flush fitment and still have a good riding car i can drive on a trip if needed without beating myself to death in it.

09-10-2021, 10:43 AM	#2 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,834 Drives: 2013 Nismo 370z Rep Power: 2684392	Are you going to stick with the factory Divorced setup in the rear or are you going true type coilovers in the rear? JARblue, Rusty and Hotrodz like this.

10-07-2021, 11:44 AM	#5 (permalink)
abm89 A True Z Fanatic Join Date: Feb 2013 Location: Austin, Texas Posts: 1,386 Drives: 11 370Z \| 24 EL450 Rep Power: 64763	The spring buckets are replaced by toe arms. __________________ Complete Parts List: https://github.com/abm89/ztouge-build

10-07-2021, 11:45 AM	#6 (permalink)
abm89 A True Z Fanatic Join Date: Feb 2013 Location: Austin, Texas Posts: 1,386 Drives: 11 370Z \| 24 EL450 Rep Power: 64763	nvm, i got beat to the info. __________________ Complete Parts List: https://github.com/abm89/ztouge-build

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10-07-2021, 01:39 PM	#9 (permalink)
Evildky Base Member Join Date: Aug 2020 Location: Louisville, KY Posts: 89 Drives: 13 Nismo STU/T3 Rep Power: 10187	What do you plan to do wiht the car? If you autocross or track the car you'll want much higher rates than a commuter car.