Upgraded differential bushings and whine
07-02-2009, 03:30 PM
#1
Elite Member
Thread Starter
iTrader: (33)
Join Date: Jan 2007
Location: Newnan, GA
Posts: 2,518
Total Cats: 30
Upgraded differential bushings and whine
First off, in seaching, I found one thread that had some pertinent information: https://www.miataturbo.net/forum/t33852/ and the following quote is from it.
I have the same bushings installed from the master kit I bought (also have MazdaSpeed Miata engine mounts), and I have noticed that from about 45-50mph and up, I can also hear a whine, it's seemingly RPM based, and is only present when my foot is on the accelerator. No gas = no noise. I haven't been able to pinpoint it's location, but my assumption is that it's R&P/diff related. I can hear it with or without the tops because I know what I'm listening for, just easier to hear with the hardtop, it's not very loud at all. Anyone else have this noise? Is this an indication of a problem or just noise produced by the stiffer mounts?
I had my 3.636 gears installed by the same machine shop that did my engine work, they used the FSM, and reported no issues at all. ZX-Tex, if you see this, did you have any diff work done during your build?
And just as a sidenote, haven't really noticed any increased vibrations from the mounts, but my car was never really smooth to start with.
I have these from FM
Flyin' Miata : Chassis : Bushings : Energy Suspension differential bushings
According to them they are a good compromise between the stock or MSM mounts and the Delrin types. Much stiffer than rubber, but not nearly as noisy as delrin.
I can hear the differential R&P whine a bit now but it is not bad at all, no big deal for me. And this is in a DD with a hard top (quiet). I would do the same thing again if I had to do it over. FWIW I also have Mazda competition engine mounts.
Flyin' Miata : Chassis : Bushings : Energy Suspension differential bushings
According to them they are a good compromise between the stock or MSM mounts and the Delrin types. Much stiffer than rubber, but not nearly as noisy as delrin.
I can hear the differential R&P whine a bit now but it is not bad at all, no big deal for me. And this is in a DD with a hard top (quiet). I would do the same thing again if I had to do it over. FWIW I also have Mazda competition engine mounts.
I had my 3.636 gears installed by the same machine shop that did my engine work, they used the FSM, and reported no issues at all. ZX-Tex, if you see this, did you have any diff work done during your build?
And just as a sidenote, haven't really noticed any increased vibrations from the mounts, but my car was never really smooth to start with.
Reply
0
0
07-02-2009, 03:35 PM
#4
I'm guessing that the stiffer mounts are just doing a better job transmitting the noise and vibration that was always there through the car to you like a screwdriver handle pressed up against your ear when you are listening for engine noise. No gas = no noise makes sense as well. Sure, they are still turning but not being pushed so no noise. My tranny is whiney even without stiffer mounts. I'm sure it would be worse with the stiffer mounts.
Last edited by Stein; 07-02-2009 at 03:53 PM.
Reply
0
0
07-02-2009, 04:41 PM
#8
If it makes you feel any better I recently installed a set of urethane diff mounts along with a 3.63 R&P. I have a whine similar to yours in the 50-65 mph range.
My car is not currently running, so I haven't had an official diagnosis, but the person who installed the R&P said its probably the mounts.
My car is not currently running, so I haven't had an official diagnosis, but the person who installed the R&P said its probably the mounts.
Reply
0
0
Thread
Thread Starter
Forum
Replies
Last Post
Frank_and_Beans
Supercharger Discussion
13
09-12-2016 08:17 PM
