Jump to content

Subframe noise


Ian
 Share

Recommended Posts

When people use solid rear subframe bushings, they often mention increased noise and harshness. What causes the noise/harshness?

Is it vibration of the metal bushing with the frame, or is it vibrations transmitted from the diff through the rest of the car?

Inquiring minds want to know!

Thanks,

Ian

Link to comment
Share on other sites

hmmm, could this be why my car is so noisy? I just bought it recently, still discovering everything. I've described it as sounding like a school bus on the inside. It's like a whiring, fairly high pitch sound that gets louder/higher pitch with more speed (although that was probably an obvious observation).

...or is the nature of an 02? I don't mind it, just trying to learn.

Link to comment
Share on other sites

hmmm, could this be why my car is so noisy? I just bought it recently, still discovering everything. I've described it as sounding like a school bus on the inside. It's like a whiring, fairly high pitch sound that gets louder/higher pitch with more speed (although that was probably an obvious observation).

...or is the nature of an 02? I don't mind it, just trying to learn.

Ask the PO if there are any urethane mounts ANYWHERE in the car (other than just end links) ..this will answer the question.

Link to comment
Share on other sites

Hey, Ian,

CD is right. A sound engineer could explain this better than I, but there's more potential for echochamber/resonance, especially w/o an interior and the sound deadening removed. On my Z Gremlin the N and V were augmented. Harshness was no different. Any drivetrain imbalance/misalignment gets unmasked-- I'll tell you about that sometime. It's nothing a little earlpug action won't cover.

Yes, you'll still be able to drive to the track.

No, take the e46 out on dates.

Happy fab'ing.

Mike

Link to comment
Share on other sites

Thanks, all. I'm just debating running tubing under my cage to connect the back of the car to the front. Either bolt or weld or use bushings to connect to the rear subframe.

I can figure out the pluses, just trying to scope out the minuses!

Ian

Link to comment
Share on other sites

hmmm, could this be why my car is so noisy? I just bought it recently, still discovering everything. I've described it as sounding like a school bus on the inside. It's like a whiring, fairly high pitch sound that gets louder/higher pitch with more speed (although that was probably an obvious observation).

...or is the nature of an 02? I don't mind it, just trying to learn.

this is more likely a noisy pinion bearing but who knows.

Doesnt mean its goibng to fail anytime soon. Ive driven the hell out of noisy diffs and they seem to just keep going

Link to comment
Share on other sites

this is more likely a noisy pinion bearing but who knows.

Doesnt mean its goibng to fail anytime soon. Ive driven the hell out of noisy diffs and they seem to just keep going

After a quick search I think you're right, thank you so much for the insight. I remember reading through some of the previous owner's threads and seeing something about a noisy differential.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...