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Old 08-26-2013, 09:56 PM   #1
1969to2010
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Suspension issue again HELP!

I had posted my last suspension nightmare a few months ago that turned out to be a trailing arm bushing now another issue awesome ( Ty again JDP )

My car had slight bump steer for a while wasn't too bad hitting bumps and going around curves the car would shimmy kind of like wobble back and fourth motion like a sway

Anyway took the car to Detroit and back for Bbomg5 now the car is 100 times worse cars moving a lot out on the road def not cool.

The car
1SS 76 mil turbo
Pfadt springs 1.25 drop
Sphon tunnel brace
BMR trailing arms
BMR toe rods
BMR full poly subframe bushings
9 inch forgestars 11 inch rears
Pfadt sway bars front and rear
Stock end links
Cars alignment is perfect tire pressures fine
Not a balancing issue bc them it would vibrate and shake

Is it the poly subframe bushings ? i have heard they move.
Any help or ideas would be greatly appreciated
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Old 08-26-2013, 10:25 PM   #2
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Do you have the adjustable BMR toe rods?

When I had issues like you are stating, it was the toe rods loosened causing the toe to be really off...to the point you couldn't drive it...
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Old 08-26-2013, 10:26 PM   #3
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No I have the non adjustables

But the toe is fine alignment is perfect
I plan to check all the bolts as well
Thnx
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Old 08-26-2013, 10:42 PM   #4
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ive had a similar issue with a challanger i just need to remember what it was
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Old 08-27-2013, 11:27 AM   #5
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It is very unlikely that the rear cradle bushings are creating the issue you are having. The BMR rear cradle bushings are a physically large bushing and they would have to wear considerably to create the symptoms you are having and I honestly just don't see that happening with them since there is very little movement when they are installed in the rear cradle. I would inspect the bushings in the toe rods and trailing arms and make sure there isn't any unwanted movement. I would also look at the rear sway bar and make everything looks kosher there. Once you narrow it down a little bit more let us know what you find.
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Old 08-27-2013, 12:03 PM   #6
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Sway bar is fine springs are seated right as well
Trailing arm bushings have been replaced already from the last issue
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Old 08-27-2013, 01:32 PM   #7
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Sounds like something is loose or possibly an end link disconnected? I would climb under there and start by putting a wrench on every nut and bolt you can get to. Keep us updated!

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Old 08-27-2013, 01:46 PM   #8
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Ill try that as soon as time allows ,
The rear end links are fine the fronts I'm pretty sure are as well

If something's loose that's an issue as well why would that happen ?


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Old 08-27-2013, 02:11 PM   #9
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Ill try that as soon as time allows ,
The rear end links are fine the fronts I'm pretty sure are as well

If something's loose that's an issue as well why would that happen ?


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It can happen from time to time if you did not use loctite during the install.

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Old 08-27-2013, 03:45 PM   #10
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Interested in this... I do also have an elusive alignment issue after installing my full BMR suspension kit, BMR rear tie rods, and trailing arms. I'm lowered on LG springs and have LG sway bar and endlinks.

To be fair, the issue became noticeable when I upgraded to the LG Z28 20x10F, 20x11R wheels. I think the weight of the wheels and tires may be "stretching" the suspension a bit. I just bought a bumpsteer correction kit today that replaces the front/outer tie rod.

I'm getting deflection under hard acceleration and braking. The car also tends to tramline quite a bit on uneven roads. Tires are 275F and 315R.

Good luck!
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Old 08-28-2013, 09:33 AM   #11
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Originally Posted by patroklai View Post
Interested in this... I do also have an elusive alignment issue after installing my full BMR suspension kit, BMR rear tie rods, and trailing arms. I'm lowered on LG springs and have LG sway bar and endlinks.

To be fair, the issue became noticeable when I upgraded to the LG Z28 20x10F, 20x11R wheels. I think the weight of the wheels and tires may be "stretching" the suspension a bit. I just bought a bumpsteer correction kit today that replaces the front/outer tie rod.

I'm getting deflection under hard acceleration and braking. The car also tends to tramline quite a bit on uneven roads. Tires are 275F and 315R.

Good luck!
The size and weight of the wheels will effect the suspension a bit but it shouldn't be as noticeable as you are saying. Have you gotten under the car and inspected everything to make sure nothing is loose or looks out of place.

With the new wheels/tires that have the bigger contact patch I am not surprised that you are noticing it tramline a bit more than it previously was with the factory wheels/tires.
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Old 08-28-2013, 09:58 AM   #12
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The size and weight of the wheels will effect the suspension a bit but it shouldn't be as noticeable as you are saying. Have you gotten under the car and inspected everything to make sure nothing is loose or looks out of place.

With the new wheels/tires that have the bigger contact patch I am not surprised that you are noticing it tramline a bit more than it previously was with the factory wheels/tires.
Thanks Kyle - I'm also going to likely do a full inspection of all the bushings since I'm wondering is something wasn't torqued all the way.

Thanks!
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Old 08-28-2013, 10:06 AM   #13
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Thanks Kyle - I'm also going to likely do a full inspection of all the bushings since I'm wondering is something wasn't torqued all the way.

Thanks!
No problem, it is hard to do anything but guess until you get up under the car and dig around a little bit. Let us know what you find.
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Old 08-29-2013, 08:00 AM   #14
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going to put her on a lift tonight and just check everything and lock tite and tighten the bolts hope that works
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Old 08-29-2013, 02:58 PM   #15
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going to put her on a lift tonight and just check everything and lock tite and tighten the bolts hope that works
I hope you find the problem! Let us know!
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Old 08-31-2013, 08:39 AM   #16
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went through it nothing was really loose . but we hit everything to make it as tight as it can be, adjusted the spring perch in the rear because it was a little tiny bit off. Car felt fine at first then the next day it started doing it again.
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Old 08-31-2013, 08:46 AM   #17
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Quote:
Originally Posted by BMR Sales View Post
It is very unlikely that the rear cradle bushings are creating the issue you are having. The BMR rear cradle bushings are a physically large bushing and they would have to wear considerably to create the symptoms you are having and I honestly just don't see that happening with them since there is very little movement when they are installed in the rear cradle. I would inspect the bushings in the toe rods and trailing arms and make sure there isn't any unwanted movement. I would also look at the rear sway bar and make everything looks kosher there. Once you narrow it down a little bit more let us know what you find.
my trailing arm bushings were replaced already because of the last issue I had
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Old 08-31-2013, 08:48 AM   #18
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That sucks man! Is there any evidence of the cradle moving around? I had a similar issue but more when I accelerated the tail end would wag. I replaced my BMR cradle inserts with Pedders full bushings and problem solved!
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Old 08-31-2013, 08:52 AM   #19
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nothing that I can see so far,
time to start swapping parts is coming just was hoping It was an easy fix.
really hate spending money and time on parts I already replaced.
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Old 08-31-2013, 09:42 AM   #20
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you are not going to find the problem with the suspension under no load. it wont show up
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Old 08-31-2013, 09:47 AM   #21
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you are not going to find the problem with the suspension under no load. it wont show up
Maybe not but at least he knows everything is tight! OP, how far are you from Wretched Motorsports? They're in Enfield CT. Just a suggestion, call Rob and see if he can check it out for you!
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Old 08-31-2013, 10:42 AM   #22
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after every adjustment we made the car was road tested

getting time to head up there is the issue but ill keep it in mind Thnx
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Old 09-03-2013, 10:46 AM   #23
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my trailing arm bushings were replaced already because of the last issue I had
If you didn't replace the bushings in the trailing arms themselves I would at least take the time to check them out. It doesn't take too much time to verify if the poly-urethane bushings are good or not in the trailing arms and toe rods.

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That sucks man! Is there any evidence of the cradle moving around? I had a similar issue but more when I accelerated the tail end would wag. I replaced my BMR cradle inserts with Pedders full bushings and problem solved!
The cradle inserts only do so much to control that movement back there since they work in conjunction with the factory rear cradle bushings. Going with full poly-urethane replacement rear cradle bushings is always a better option and will control the rear cradle substantially better.
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Old 09-03-2013, 03:08 PM   #24
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If you didn't replace the bushings in the trailing arms themselves I would at least take the time to check them out. It doesn't take too much time to verify if the poly-urethane bushings are good or not in the trailing arms and toe rods.



The cradle inserts only do so much to control that movement back there since they work in conjunction with the factory rear cradle bushings. Going with full poly-urethane replacement rear cradle bushings is always a better option and will control the rear cradle substantially better.
Agreed!
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Old 09-12-2013, 05:06 PM   #25
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So wht was the problem ?
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