Help BC Racing Rear Height Adjustment?
01-19-2014 | 05:34 AM
#1
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BC Racing Rear Height Adjustment?
I just made an account because I cannot find help, I've searched and tried everything but i'm totally confused since they are OEM type coilovers.
First off, Is there a way to adjust my BC br type coilovers in the rear without messing up the set preload?
Also, HOW do I adjust the ride height on the rear? Do i adjust the strut? Do i adjust the spring? Both? I cannot figure out for the life of me whats going on with the rear of the car?
Any help would be appreciated.. Thanks.
First off, Is there a way to adjust my BC br type coilovers in the rear without messing up the set preload?
Also, HOW do I adjust the ride height on the rear? Do i adjust the strut? Do i adjust the spring? Both? I cannot figure out for the life of me whats going on with the rear of the car?
Any help would be appreciated.. Thanks.
01-19-2014 | 08:36 AM
#2
This post should help you out: BC BR Coilover Rear adjustment! Need help! - G35Driver
In short, The spring in the back is what changes the height. Once you adjust the spring to your desired height, you adjust the strut to set your preload. With the bottom bolt on the shock fork removed, you jack up the spring bucket just until the point that the spring has tension. You then adjust the shock by loosing the lock ring spinning the strut so that the fork hole is 5-8mm above lining up. You then jack the spring bucket up the additional 8mm aligning the holes, essentially pre-loading the spring. Hope this helps.
In short, The spring in the back is what changes the height. Once you adjust the spring to your desired height, you adjust the strut to set your preload. With the bottom bolt on the shock fork removed, you jack up the spring bucket just until the point that the spring has tension. You then adjust the shock by loosing the lock ring spinning the strut so that the fork hole is 5-8mm above lining up. You then jack the spring bucket up the additional 8mm aligning the holes, essentially pre-loading the spring. Hope this helps.
01-19-2014 | 11:34 PM
#4
This post should help you out: BC BR Coilover Rear adjustment! Need help! - G35Driver
In short, The spring in the back is what changes the height. Once you adjust the spring to your desired height, you adjust the strut to set your preload. With the bottom bolt on the shock fork removed, you jack up the spring bucket just until the point that the spring has tension. You then adjust the shock by loosing the lock ring spinning the strut so that the fork hole is 5-8mm above lining up. You then jack the spring bucket up the additional 8mm aligning the holes, essentially pre-loading the spring. Hope this helps.
In short, The spring in the back is what changes the height. Once you adjust the spring to your desired height, you adjust the strut to set your preload. With the bottom bolt on the shock fork removed, you jack up the spring bucket just until the point that the spring has tension. You then adjust the shock by loosing the lock ring spinning the strut so that the fork hole is 5-8mm above lining up. You then jack the spring bucket up the additional 8mm aligning the holes, essentially pre-loading the spring. Hope this helps.
01-19-2014 | 11:36 PM
#5
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This post should help you out: BC BR Coilover Rear adjustment! Need help! - G35Driver
In short, The spring in the back is what changes the height. Once you adjust the spring to your desired height, you adjust the strut to set your preload. With the bottom bolt on the shock fork removed, you jack up the spring bucket just until the point that the spring has tension. You then adjust the shock by loosing the lock ring spinning the strut so that the fork hole is 5-8mm above lining up. You then jack the spring bucket up the additional 8mm aligning the holes, essentially pre-loading the spring. Hope this helps.
In short, The spring in the back is what changes the height. Once you adjust the spring to your desired height, you adjust the strut to set your preload. With the bottom bolt on the shock fork removed, you jack up the spring bucket just until the point that the spring has tension. You then adjust the shock by loosing the lock ring spinning the strut so that the fork hole is 5-8mm above lining up. You then jack the spring bucket up the additional 8mm aligning the holes, essentially pre-loading the spring. Hope this helps.
ahahaha
01-20-2014 | 02:33 AM
#6
01-20-2014 | 06:55 PM
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01-20-2014 | 09:05 PM
#8
You'll have to put the rear on jack stands to keep the axle suspended, then after removing tires and removing rear spring and lower shock bolt, adjust spring collar up 1/3" tighten collar locks, you then preload spring about 1/4" to 1/3" then adjust shock to be fully extended, lock the collar rings on shock, mount lower shock bolt and that's it.
01-21-2014 | 11:21 AM
#9
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You'll have to put the rear on jack stands to keep the axle suspended, then after removing tires and removing rear spring and lower shock bolt, adjust spring collar up 1/3" tighten collar locks, you then preload spring about 1/4" to 1/3" then adjust shock to be fully extended, lock the collar rings on shock, mount lower shock bolt and that's it.
Wutttt? Do you mean the rear spring bucket bolt?!
This is hopeless. I'm a visual learner and no one has made any videos or pictured threads to help
01-21-2014 | 12:16 PM
#10
The bolt in the lower left point in the photo is where you'll jack up the spring for preload (it's the very end of the spring bucket), the height collar can be adjusted w/ the spring still on the car as long as you can get your wrenches in there, if not you'll have to remove the spring. And the lower shock bolt is removed to adjust the shock height. Hope that helps.
01-21-2014 | 04:51 PM
#11
I've talked to BC tech and according to them this is what you do, step by step once the cars on jacks.
Go to the spring. Those 2 lock rings on top. Move those up to lower (into cars chassis) or down to raise (floor). You said you want it 1/3 lower so you'd just take it up 1/3.
Once you've done that, unlock the collar on the strut and twist it right to left, until the spring is on sitting firmly on the 2 lock rings.
They said you do not have to unto the lower strut bolt as it doesn't really help with the G37's.
They did not mention anything about raising the spring bucket for preload as twisting the shock, you will eventually be creating preload when the spring starts to sit on the lock rings in their new position...
The 3rd number on your spring is how long your spring is in mm. If you want 8mm of preload, keep preloading with the strut until it is 8mm shorter then what is written.
(230-8 = 222mm) <-- that is what your spring height should be if you want 8mm..
EDIT : Also, Mark with a white sharpie, or something that will stay visible, where both the spring and strut is before you make any changes. Just in case you mess up.
Go to the spring. Those 2 lock rings on top. Move those up to lower (into cars chassis) or down to raise (floor). You said you want it 1/3 lower so you'd just take it up 1/3.
Once you've done that, unlock the collar on the strut and twist it right to left, until the spring is on sitting firmly on the 2 lock rings.
They said you do not have to unto the lower strut bolt as it doesn't really help with the G37's.
They did not mention anything about raising the spring bucket for preload as twisting the shock, you will eventually be creating preload when the spring starts to sit on the lock rings in their new position...
The 3rd number on your spring is how long your spring is in mm. If you want 8mm of preload, keep preloading with the strut until it is 8mm shorter then what is written.
(230-8 = 222mm) <-- that is what your spring height should be if you want 8mm..
EDIT : Also, Mark with a white sharpie, or something that will stay visible, where both the spring and strut is before you make any changes. Just in case you mess up.
Last edited by NoveL48; 01-21-2014 at 05:32 PM.
01-21-2014 | 05:22 PM
#12
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I've talked to BC tech and according to them this is what you do, step by step once the cars on jacks.
Go to the spring. Those 2 lock rings on top. Move those up to lower (into cars chassis) to lower or down to raise (floor). You said you want it 1/3 lower so you'd just take it up 1/3.
Once you've done that, unlock the collar on the strut and twist it right to left, until the spring is on sitting firmly on the 2 lock rings.
They said you do not have to unto the lower strut bolt as it doesn't really help with the G37's.
They did not mention anything about raising the spring bucket for preload as twisting the shock, you will eventually be creating preload when the spring starts to sit on the lock rings in their new position...
The 3rd number on your spring is how long your spring is in mm. If you want 8mm of preload, keep preloading with the strut until it is 8mm shorter then what is written.
(230-8 = 222mm) <-- that is what your spring height should be if you want 8mm..
Go to the spring. Those 2 lock rings on top. Move those up to lower (into cars chassis) to lower or down to raise (floor). You said you want it 1/3 lower so you'd just take it up 1/3.
Once you've done that, unlock the collar on the strut and twist it right to left, until the spring is on sitting firmly on the 2 lock rings.
They said you do not have to unto the lower strut bolt as it doesn't really help with the G37's.
They did not mention anything about raising the spring bucket for preload as twisting the shock, you will eventually be creating preload when the spring starts to sit on the lock rings in their new position...
The 3rd number on your spring is how long your spring is in mm. If you want 8mm of preload, keep preloading with the strut until it is 8mm shorter then what is written.
(230-8 = 222mm) <-- that is what your spring height should be if you want 8mm..
01-21-2014 | 06:12 PM
#13
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I had the same problem with my car, I did not understand how to lower the back or raise it. What i did was call bc racing directly and ask them step by step. What you do is:
Step 1: Raise car off the floor by the pumpkin in the back so there is no stress on the springs or shock, etc. Step 2: Take off wheels. Step 3: Measure what you have at the moment so you know what height you want. Step 4: If you want to go down you go counter clockwise on the spring. Loosen the top perch of the spring and raise it up how low you want to go. Then Bring the bigger bottom perch up until it meets with the smaller perch. Tighten that up and get the measurements so you can do the other side. Step 5: unlock perch on shock raise the perch up the exact measurement (so you raised your spring 1 inch you lower your shock 1 inch) to make sure you made the right adjustment to your shock you raise the perch w.e you raised the spring and then make the perch spin, you will have to spend the shock clock wise until the perch hit the bottom where it locks on. Step 5: lock all perches in together lower your car, drive it back in forth so the spring and shock settle and you should be good. I did this way and it worked, you dont have to remove anything. Hope it helps (remember if you want to go down go counter clock wise on spring and clock wise on the shock) If you want to go up do the opposite
Step 1: Raise car off the floor by the pumpkin in the back so there is no stress on the springs or shock, etc. Step 2: Take off wheels. Step 3: Measure what you have at the moment so you know what height you want. Step 4: If you want to go down you go counter clockwise on the spring. Loosen the top perch of the spring and raise it up how low you want to go. Then Bring the bigger bottom perch up until it meets with the smaller perch. Tighten that up and get the measurements so you can do the other side. Step 5: unlock perch on shock raise the perch up the exact measurement (so you raised your spring 1 inch you lower your shock 1 inch) to make sure you made the right adjustment to your shock you raise the perch w.e you raised the spring and then make the perch spin, you will have to spend the shock clock wise until the perch hit the bottom where it locks on. Step 5: lock all perches in together lower your car, drive it back in forth so the spring and shock settle and you should be good. I did this way and it worked, you dont have to remove anything. Hope it helps (remember if you want to go down go counter clock wise on spring and clock wise on the shock) If you want to go up do the opposite
01-21-2014 | 09:08 PM
#14
Sorry guys, tried to go by memory and being over 50 that's not always the best idea
There's a few ways to do this and it looks like I've spent a bit more time than I should have, lol.
Thanks for the improved details!
There's a few ways to do this and it looks like I've spent a bit more time than I should have, lol.
Thanks for the improved details!
01-22-2014 | 01:15 PM
#15
I had the same problem with my car, I did not understand how to lower the back or raise it. What i did was call bc racing directly and ask them step by step. What you do is:
Step 1: Raise car off the floor by the pumpkin in the back so there is no stress on the springs or shock, etc. Step 2: Take off wheels. Step 3: Measure what you have at the moment so you know what height you want. Step 4: If you want to go down you go counter clockwise on the spring. Loosen the top perch of the spring and raise it up how low you want to go. Then Bring the bigger bottom perch up until it meets with the smaller perch. Tighten that up and get the measurements so you can do the other side. Step 5: unlock perch on shock raise the perch up the exact measurement (so you raised your spring 1 inch you lower your shock 1 inch) to make sure you made the right adjustment to your shock you raise the perch w.e you raised the spring and then make the perch spin, you will have to spend the shock clock wise until the perch hit the bottom where it locks on. Step 5: lock all perches in together lower your car, drive it back in forth so the spring and shock settle and you should be good. I did this way and it worked, you dont have to remove anything. Hope it helps (remember if you want to go down go counter clock wise on spring and clock wise on the shock) If you want to go up do the opposite
Step 1: Raise car off the floor by the pumpkin in the back so there is no stress on the springs or shock, etc. Step 2: Take off wheels. Step 3: Measure what you have at the moment so you know what height you want. Step 4: If you want to go down you go counter clockwise on the spring. Loosen the top perch of the spring and raise it up how low you want to go. Then Bring the bigger bottom perch up until it meets with the smaller perch. Tighten that up and get the measurements so you can do the other side. Step 5: unlock perch on shock raise the perch up the exact measurement (so you raised your spring 1 inch you lower your shock 1 inch) to make sure you made the right adjustment to your shock you raise the perch w.e you raised the spring and then make the perch spin, you will have to spend the shock clock wise until the perch hit the bottom where it locks on. Step 5: lock all perches in together lower your car, drive it back in forth so the spring and shock settle and you should be good. I did this way and it worked, you dont have to remove anything. Hope it helps (remember if you want to go down go counter clock wise on spring and clock wise on the shock) If you want to go up do the opposite