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BMR Turbo-K, BMR upper/lower control arms.....LOUD BANG when backing up......
So, one of my last items to rectify after my new engine install and these suspension parts went in.
When I back up and turn the wheel either way, there's a big *** bang. Like something is loading up and then letting go with a quick bang......and its friggin loud.
There is absolutely nothing we can find as damage spots, or impact spots....nothing. One time only did it do this while moving forward at maybe jogging speed when I had to hit my breaks real fast (idiot started walking across the street as the light turned gree). I heard the big *** bang as I hit the breaks.
While driving forward its all normal, never had any noise or feeling anything abnormal.
Anyone had anything like this with these installed parts?
I'm thinking its the sway bar because its the only thing that can move......
Question:
Can I remove my front sway bar and safely go for a normal city drive? Back up, turn, hit the breaks....... To see if that bang doesn't happen?
You can drive without the sway bar but I don’t think that is going make the noise go away. When my sway bar end links were bad the sway bar would bang around when going over bumps, so it was pretty much making noise all the time.
You can drive without the sway bar but I don’t think that is going make the noise go away. When my sway bar end links were bad the sway bar would bang around when going over bumps, so it was pretty much making noise all the time.
This noise sounds like the end of the world when it makes that bang sound.
My end links are brand new.
I noticed one day the drivers side end of the seat bar, the very tip where the end links are, was about 3-4 millimeters from my shock. Then the next time I was under the car it was maybe 3 inches away. Siting up on my front end ramps like the time before when the sway bar end was millimeters away.
It must be something that is able to move, every other part is torqued to BMR specs and they’ve all been visually checked for movement or impact damage.
We cant find anything.
Maybe a bad alignment?
I’ll remove the sway bar to see what happens. It’s all I can think of to try.
This noise sounds like the end of the world when it makes that bang sound.
My end links are brand new.
I noticed one day the drivers side end of the seat bar, the very tip where the end links are, was about 3-4 millimeters from my shock. Then the next time I was under the car it was maybe 3 inches away. Siting up on my front end ramps like the time before when the sway bar end was millimeters away.
It must be something that is able to move, every other part is torqued to BMR specs and they’ve all been visually checked for movement or impact damage.
We cant find anything.
Maybe a bad alignment?
I’ll remove the sway bar to see what happens. It’s all I can think of to try.
They’re good. But something loose with the brakes I would expect the noise to be with any movement. This is really only backing up while turning the steering wheel either way.
I also forgot…..I did hear it a couple times just backing out of the driveway straight and the two front tires hit that little rainwater kind of thing at the end of the driveway……going slow and it’s a tiny little bounce.
Also……if I turn the steering wheel all the way to the RIGHT it feels like the front right tire is kind of trying to hop-hop-hop-hop…… Take some steering out and it stops.
Are the upper control arms installed on thier correct sides?
Jeez, I hope so.
Can you tell me the easiest way I can verify that?
I also have these from BMR, but they’ve been there for several years before I installed the BMR turbo-k and BMR upper/lower control arms and everything was perfectly fine.
Can you tell me the easiest way I can verify that?
I also have these from BMR, but they’ve been there for several years before I installed the BMR turbo-k and BMR upper/lower control arms and everything was perfectly fine.
Straight tube on the upper is to the rear and the bent portion to the front. I don’t know if it’s possible to assemble them on opposite sides but you never know.
Straight tube on the upper is to the rear and the bent portion to the front. I don’t know if it’s possible to assemble them on opposite sides but you never know.
ok I’ll check as soon as I get home, car is up on front end ramps because I just replaced the alternator and A/C belt.
Ill check, thanks, it’s probably gonna be something simple like that.
I have the same K member and mine does the same thing. Check your control arms. My k member have witness marks like the control arms are sliding back and forth. I think the bolts and washers included are not a good design.
I have the same K member and mine does the same thing. Check your control arms. My k member have witness marks like the control arms are sliding back and forth. I think the bolts and washers included are not a good design.
I spoke to BMR since all of this is their parts. They sounded like they never heard of this before, which is impossible because my car never did this before with the factory stock kmember and control arms. We can;t be the first few people with this issue.
Surprised BMR hasn't chimed in here they obviously saw the thread title.
We'll check closer to look for witness marks when it gets aligned....now on Friday.
Since this bang only happens while backing up AND while turning the steering wheel any amount…..much worse when turned all the way…..you think it could be that as you turn the steering wheel the BMR parts cause the tires to temporarily go out of alignment causing both tires to start fighting each other loading up, on whichever side does the bang, it’s the entire strut tower releasing that load and making the bang?
If two tires are pulling in different directions that’s a big load being applied to everything. The side making the bang could be that tire skipping as it bangs towards where the other tire is going.
I think I’ll take the car n a big area and turn the wheel so I can keep backing up non-stop in a big circle. See if it keeps reloading and banging, then reloading and another bang, and so on. That will confirm it’s a “loading up” issue. Which to me, means the tires are tracking in different directions as the steering wheel is turned and backing up.
which means they probably go out of alignment going forward to, but not as much load.
When I do the alignment on Friday if it’s not fixed I’ll have my friend walk near the front tire as I back up with steering wheel turned to see if the tire/rim suddenly jerks when the bang happens.
If this is not fixable BMR will need to take the car and figure it out. I’m relatively close to their shop. It’s 100% their parts causing this as none of it was present with my factory parts. And all other parts combined with my entire front end are factory.
my formula a 99 made this sound after an alignment , it was the bolts for the lower control arm were not tight enough , only did it when backing up and turning , it was real bad when parking for a car show , backing into a spot with a road that had a crown to it . IT needed another alignment and someone to tighten the control arm bolts a little more than factory spec. Fyi i was on stock k member and control arms but they were new control arms upper and lower. I hope it just you car needs someone to pay attention when aligning it and everything will be good.
my formula a 99 made this sound after an alignment , it was the bolts for the lower control arm were not tight enough , only did it when backing up and turning , it was real bad when parking for a car show , backing into a spot with a road that had a crown to it . IT needed another alignment and someone to tighten the control arm bolts a little more than factory spec. Fyi i was on stock k member and control arms but they were new control arms upper and lower. I hope it just you car needs someone to pay attention when aligning it and everything will be good.
interesting, thanks.
Which bolts were the loose ones. The vertical or horizontal bolts?
Cant hurt to snug all of them a little beyond spec I guess.
So you think that loud bang each time is the lower control arm actually slipping position ever so slightly and it’s that loud? Mine is like a gun shot.
Drove it today. Its doing something new. back out of the driveway......same old BANG. Then as soon as I put it in drive and start to idle forward with the wheel straigh, it BANGS back to (I presume) where it was before the first backing-up BANG. Did it like that every time today.
I just wanted to see if it would keep banging and it only does one bang backing up and one bang going forward. So with this info and what "ramairetransam" said, it actually might be slipping to its most rearward limit and then back to the most forward limit, or whever it was. Can't belive its that damn loud from something moving a matter of millimeters.
06-20-2024, 10:54 PM
BMR Turbo-K, BMR upper/lower control arms.....LOUD BANG when backing up...... 
