ohayou88

iTrader: (7)

So I'll be replacing my diff mounts soon. My car is making really bad clunking sounds, vibrations etc. So i was looking at rear diff mounts. The delrin ones are extremely cheap vs the ones that are mazda comp.

I've done the search and the only differnce I can find is how stiff they are and transmit more vibration to the chassis.

Is it the delrins that transmit more vibration or the mazda comps?

Is there any other differnce?

Funkspectrum

iTrader: (5)

I like the mazdacomp mounts

ohayou88

iTrader: (7)

did u notice any vibrations when u put them on opposed to the stock ones. or are you the few that keep ripping their mounts?

Funkspectrum

iTrader: (5)

little vibration....no rippage.

7dust

iTrader: (14)

Betcha its not the rear mounts - its the front one OR it has cracked the subframe attachment tab where the front mount bolts into.

ohayou88

iTrader: (7)

yea i know its probally only the front mount. but I want to make sure so im gonna replace all of them. you know how it is with these cars. very paranoid

Valkyrie

according to the responses I got in the thread I made, delrin mounts are as good as solid, so they WILL cause a severe increase in NVH (noise vibrations hardness).

Now, the black hard plastic ones (not as hard as delrin?) I don't know about, but I'd say yes. Everyone I got an opinion from said they put hard ones on then went back to the stock ones.

Spraintz

iTrader: (1)

I have solid aluminum ones.............oh yes, there is PLENTY of vibrations
but I likem

ohayou88

iTrader: (7)

how noticeable is the vibration. Can you feel it or can it only be heard?

Valkyrie

I'd personally rather feel vibrations than here them...

ohayou88

iTrader: (7)

yea i would much rather feel than hear... so on the mazdacomp can they only be felt or heard?

DriftingB26RX7

iTrader: (4)

I have the mazda comp I like it but still feel vibration...I would like to change the 2 top diff mounts also then my motor mounts

7dust

iTrader: (14)

I turned my rear mounts upside down and welded a small plate across the front mount - effectively solid mounting the diff. In combination with my solid motor and tranny mounts I can feel everything the drivetrain does. Of course, the response is terrific when you romp on it.

ohayou88

iTrader: (7)

is the vibration very subtle or is extremely noticeable like a broken front diff mount

Spraintz

iTrader: (1)

not really subtle but nothing close to a broken diff mount.

I feel the vibration. I rode in a car that had the AL ones before I got mine. The vibration feel kinda weird like something is wrong if yer not expecting it, but the vibrations are mostly in the "takeoff"/0-3000 RPM area. after that it's pretty smooth and ya don't really notice it. I can tell you this, I have definately noticed the power transfer due to the solid mounts. gives a much "tighter" feel to acceleration and shifting.

I don't have the solid tranny mounts yet but I'm told that with them installed shifting improves even more.

Hot_Dog

I don't know about the delrin mounts, but I did install the Mazda Comp rear mounts on my 90 GXL a few years back when I put in an LSD. I do get some resonant vibrations in certain speed/rpm ranges. The vibrations become more pronounced when it gets cold outside. If I were to remove the differential again, I would probably go back to the stock Mazda mounts.

Hot_Dog
90 RX7 GXL