Knocking sounds from lowering springs?

[bbaik]

I recently installed Mach V lowering springs on my Fr-s. Ever since, I've been getting some relatively loud knocking noises whenever I go over uneven ground or bumps. The car seems to drive fine but the noises definitely raise suspicion since the car has only been dropped an inch. Most of the noises seem to be coming from the front, right strut but its hard to be certain.

I haven't trimmed my bumpstop yet. Mach V recommends that users trim the OEM bumpstop by 1 inch. Could this be the problem? I don't want to trim the bumpstop since I may have to return to the stock springs.

This is how front spring sits with the wheel on the ground. Should the fact that the top coils touch raise any concerns?

[wholeeoh]

i have the same issue now with my sportlines lol...only think i can imagine is that i didnt completely tighten my front endlinks?

[Mach V Dan]

Originally Posted by bbaik

I recently installed Mach V lowering springs on my Fr-s. Ever since, I've been getting some relatively loud knocking noises whenever I go over uneven ground or bumps.

The most common problem we've seen is that you haven't got the top nut on the shock fully tightened. If it's loose, the top of the stock will rattle around relative to the top mount.

I haven't trimmed my bumpstop yet. Mach V recommends that users trim the OEM bumpstop by 1 inch. Could this be the problem?

No. If you don't trim it, you're just going to run into the stop sooner, effectively limiting travel. But there won't be any clunking in either case.

I don't want to trim the bumpstop since I may have to return to the stock springs.

At that point you could just buy new ones from the dealer, or from us. They only cost a few bucks.

This is how front spring sits with the wheel on the ground. Should the fact that the top coils touch raise any concerns?

No. They are designed that way, so the spring remains in tension under suspension droop.

Get the car up in the air and wiggle around the strut, sway bars, and other moving parts of the suspension. My guess is that something is loose that should be snug and tight.

--Dan
Mach V

[Jive Turkey]

what dan said. if the top nut isn't tight, it will make all kinds of noises. the bump stop shouldn't be the problem at all.

[bakerr6]

I plan on installing mine when it gets a little warmer out (and I'm not working 6 days a week haha). You could always also buy the bumpstops from eibach and install those

[bbaik]

Originally Posted by wholeeoh

i have the same issue now with my sportlines lol...only think i can imagine is that i didnt completely tighten my front endlinks?

This was actually it. Was about to take out the entire strut and realized the endlink was a bit loose.

Originally Posted by Mach V Dan

The most common problem we've seen is that you haven't got the top nut on the shock fully tightened. If it's loose, the top of the stock will rattle around relative to the top mount.


No. If you don't trim it, you're just going to run into the stop sooner, effectively limiting travel. But there won't be any clunking in either case.


At that point you could just buy new ones from the dealer, or from us. They only cost a few bucks.


No. They are designed that way, so the spring remains in tension under suspension droop.

Get the car up in the air and wiggle around the strut, sway bars, and other moving parts of the suspension. My guess is that something is loose that should be snug and tight.

--Dan
Mach V

Thank you for the help! The springs are running fine now.

[wholeeoh]

Originally Posted by bbaik

This was actually it. Was about to take out the entire strut and realized the endlink was a bit loose.



Thank you for the help! The springs are running fine now.

that was also the problem in my case lmfao

[636]

My BC Racing coilovers are making a knocking sound from the rear, y'all think it's the top nut?