Speed Bump Clunk Front Left Wheel - Second Generation Nissan Xterra Forums (2005+)
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post #1 of 12 (permalink) Old 05-16-2017, 10:54 PM Thread Starter
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Speed Bump Clunk Front Left Wheel

Okay, so I have spent many hours researching what my problem is exactly. I have no other choice after an exhausted effort, but to just ask a question that has already been discussed before. This time specific for my situation. Here goes;

When I go over a speed bump it is most noticeable, but it was also on a dirt road that were washboard type when it presents itself. The noise is a very significant clunk. It happens when the wheel comes down after the bump. Sounds metal on metal but not a sharp sound really... I just recently put in new billstein 5100 adjustables at a 2" lift. I kept the original coils and from what I could tell nothing else in the suspension has been replaced in it's 160,xxx miles . I also put on new wheels and tires but I don't feel that would have any affect. I drove for roughly 300 miles before the noise started. Help me please.

Last edited by curtism; 05-16-2017 at 10:57 PM.
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post #2 of 12 (permalink) Old 05-16-2017, 11:06 PM
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If you have stock upper control arms, it is coil bucket contact due to the lift. When I put my 2" lit kit on for the first time I kept everything stock and I got the same "metal on metal" clunking. What happened is the lift causes the upper control arm to droop very close to where your coil mounts to the frame (coil bucket) and if you hit any sort of a bump, especially speed bumps, you get that clunking. I went and got myself aftermarket SPC Upper control arms and the clunking disappeared.

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post #3 of 12 (permalink) Old 05-17-2017, 12:25 PM
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Originally Posted by 05XGrant View Post
If you have stock upper control arms, it is coil bucket contact due to the lift. When I put my 2" lit kit on for the first time I kept everything stock and I got the same "metal on metal" clunking. What happened is the lift causes the upper control arm to droop very close to where your coil mounts to the frame (coil bucket) and if you hit any sort of a bump, especially speed bumps, you get that clunking. I went and got myself aftermarket SPC Upper control arms and the clunking disappeared.
Is this the infamous CBC? I'm having a tough time visualizing how it works, any good pics anywhere?
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post #4 of 12 (permalink) Old 05-17-2017, 12:38 PM
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Quote:
Originally Posted by curtism View Post
Okay, so I have spent many hours researching what my problem is exactly. I have no other choice after an exhausted effort, but to just ask a question that has already been discussed before. This time specific for my situation. Here goes;

When I go over a speed bump it is most noticeable, but it was also on a dirt road that were washboard type when it presents itself. The noise is a very significant clunk. It happens when the wheel comes down after the bump. Sounds metal on metal but not a sharp sound really... I just recently put in new billstein 5100 adjustables at a 2" lift. I kept the original coils and from what I could tell nothing else in the suspension has been replaced in it's 160,xxx miles . I also put on new wheels and tires but I don't feel that would have any affect. I drove for roughly 300 miles before the noise started. Help me please.
Get aftermarket UCA's, or you can put a bumpstop on the OEM UCA to reduce (eliminate in my case) the noise and metal on metal contact.
These are the bumpstops I used IIRC
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Is this the infamous CBC? I'm having a tough time visualizing how it works, any good pics anywhere?
This but minus the bumpstop.
(not my picture)
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post #5 of 12 (permalink) Old 05-17-2017, 03:05 PM
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Guys, no CBC with just 5100s... That only happens with spacer lifts.

OP, one of two things is probably happening.

1) The strut is assembled incorrectly. The bushing stack at the top is missing the collar and the shock shaft is going through upper mount causing the noise. This happens quite often as users/ techs don't read the directions and discard this collar thinking the washer is all that is needed. This should be addressed ASAP as it is unsafe.

2) You are hearing the shock top out. Since you lifted the truck with equally increasing wheel travel you have much less droop travel and you are now hearing the shock run out of stroke and hit the internal top out bumper. This will not cause damage but is annoying.
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post #6 of 12 (permalink) Old 05-17-2017, 07:04 PM
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Speed Bump Clunk Front Left Wheel

Quote:
Originally Posted by Glamisdude View Post
Guys, no CBC with just 5100s... That only happens with spacer lifts.



OP, one of two things is probably happening.



1) The strut is assembled incorrectly. The bushing stack at the top is missing the collar and the shock shaft is going through upper mount causing the noise. This happens quite often as users/ techs don't read the directions and discard this collar thinking the washer is all that is needed. This should be addressed ASAP as it is unsafe.



2) You are hearing the shock top out. Since you lifted the truck with equally increasing wheel travel you have much less droop travel and you are now hearing the shock run out of stroke and hit the internal top out bumper. This will not cause damage but is annoying.


This.

I don't get why everyone thinks 2" lift causes CBC no matter what. It doesn't. All depends on the length of coilover.
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Last edited by jsexton; 05-17-2017 at 07:07 PM.
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post #7 of 12 (permalink) Old 05-17-2017, 09:31 PM Thread Starter
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Okay, Lots of info. Thank You! I like all of the advise but getting new UCA's might be overkill if I don't have to use that as the fix. I for sure like the bump stop idea based on ease of install and price. I don't wheel very difficult stuff, in fact mostly just simple off roads trails with maybe some moderate level of difficulty. Would putting these bump stops on be sufficient? I know that they are installed correctly, I double checked when I put them on and it is as the instructions described.
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post #8 of 12 (permalink) Old 05-17-2017, 09:34 PM
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Quote:
Originally Posted by curtism View Post
Okay, Lots of info. Thank You! I like all of the advise but getting new UCA's might be overkill if I don't have to use that as the fix. I for sure like the bump stop idea based on ease of install and price. I don't wheel very difficult stuff, in fact mostly just simple off roads trails with maybe some moderate level of difficulty. Would putting these bump stops on be sufficient? I know that they are installed correctly, I double checked when I put them on and it is as the instructions described.


The only post you should be reading in this is glamisdudes.

If you are getting clunking, you either have coilovers assembled wrong, or you are topping out your shocks. Nothing with the uca will fix either.


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post #9 of 12 (permalink) Old 05-17-2017, 09:48 PM Thread Starter
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The only post you should be reading in this is glamisdudes.

If you are getting clunking, you either have coilovers assembled wrong, or you are topping out your shocks. Nothing with the uca will fix either.
So being that they are installed correctly, anytime this 2" lift is done with these shocks, you get a big clunk when going over bumps...? Please tell me there's a fix.
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post #10 of 12 (permalink) Old 05-17-2017, 09:57 PM
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Well, if that's what you are getting, dialing them back to 1" or 0.5" lift, adding a 1" or 1.5" top plate spacer, and aftermarket uca's would do it.

If you are getting CBC somehow (might be possible I suppose if your bushings are very very worn), you would see marks on the bottom of your uca and on top of the top hat.


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