are these mmr diff mounts goig to rattle my teeth out of my head? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 03-22-2008, 02:36 PM   #1
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Default are these mmr diff mounts goig to rattle my teeth out of my head?

My stock bushings are like brand-new, but I have the mmr delrin diff mounts. However, i don't want to deal with everything in the car shaking.


I have the engine mounts too, but I think that might be a bad move.
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Old 03-22-2008, 02:59 PM   #2
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with both it will create some pretty rediclius vibrations. For me its worth it. The instantious feel of the throttle is awesome. No wasted energy. Go with it For the benefits its worth it.
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Old 03-22-2008, 03:05 PM   #3
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Funny, I did not notice excess vibrations with the mmr engine mounts... my engine is balanced though, so maby that makes a difference.
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Old 03-22-2008, 03:06 PM   #4
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Don't forget that part of the diff bushings purpose is to transition power load to the rear from the drive (propellor) shaft. Remove the bushings and that nice crisp feeling is also a sign that gears (and rest of the driveline) are taking a bigger beating. It's no different that using an unsprung hub clutch disk with cerametallic pucks - it's no longer the "weak" link in the drive line.

I agree that it's definitely preventing power loss - but outside of competition, is it worth price?
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Old 03-22-2008, 03:11 PM   #5
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I cant wait to get my delrin diff bushings, stiff=good
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Old 03-22-2008, 03:15 PM   #6
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Also means more noise and vibration to...so you decide
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Old 03-22-2008, 03:25 PM   #7
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Buddy of mine, who is roommates with the guy that makes the MMR mounts said he just got the motor mounts. He also said it was the biggest mistake ever because at idle the car shakes so bad with them he can't stand it. He also said that the part of the roof that is bonded, the frame to the top sheet, has broken loose because of all the vibration.
So if a hardcore drift fanatic hates them I'm sure you will as well.
( Now watch rappa come in here and say something.)
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Old 03-22-2008, 04:10 PM   #8
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i notice lots of people going about the stiffer urethane mounts, but thwats the problem with the mazdaspeed ones? i wouldnt mind paying too much of a premium if they are better in terms of stiffness and still can maintain a quiet driving level, as comparable to installing the mazdaspeed motor mounts too.
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Old 03-22-2008, 05:06 PM   #9
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Do you drive the car on the street at all? It'll get old pretty quickly. The engine mounts may not be a difficult swap to just see what happens, but the diff mounts would be a pain. Try the engine mounts first to see if you can tolerate it, then go from there. If you're still running on OEM suspension bushings, then it may be a better idea to purchase the ES master kit, since you track the car.

It's been over a year since I installed the MS engine and diff mounts, but NVH is not an issue at all with them.
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Old 03-22-2008, 06:07 PM   #10
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I would move to the diff mounts before I did the motor mounts. For me, wheel spin leads to a bit of hop. I'm pretty sure it's not a blown shock...though it may lead to one. I'm almost certain its because of worn mounts.

From what I've heard the Mazdaspeed mounts don't really provide enough benefit to be worth the cost. If your old mounts are torn and you are replacing them anyway, perhaps. But if you are buying to up grade...not much of an upgrade.
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Old 03-22-2008, 07:14 PM   #11
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the diff came out of a car with 16k miles, so I left them in there and put shoe goo in them like the SM guys.

Where can I get the MS motor mounts cheap? I'll trade my mmr diff and engine mounts for the MS motor mounts...or maybe just new stockers.
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Old 03-22-2008, 07:31 PM   #12
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try corksport. i just ordered my set from them for 75 shipped.
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Old 03-22-2008, 08:23 PM   #13
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miataroadster has the mazdacomp mounts.

i have the MMR mounts and the car "feels" great. but i wouldnt do it if the car is a daily, it does get old when just driving the car normal
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Old 03-22-2008, 08:42 PM   #14
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Quote:
Originally Posted by cjernigan View Post
He also said that the part of the roof that is bonded, the frame to the top sheet, has broken loose because of all the vibration.
So if a hardcore drift fanatic hates them I'm sure you will as well.
( Now watch rappa come in here and say something.)
...thats why i responded first. they are no joke, they create some crazy vibrations. it all depends on what you want to do with your car. you have to ask yourself. full race car feel? with all the added response of solid mounts or the just 1% better feel that the mazdaspeeds did for me. over my broken mounts.
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Old 03-22-2008, 11:54 PM   #15
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dan didn't scott put those in his car?
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Old 03-23-2008, 12:18 AM   #16
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Ive got the MMR diff mounts on my car, i do track it but that is not why i went with them. I went with them because they came brand new with my torsen, although i wouldnt want it an other way. I daily drive my 90 and i love the feel of it, savington can vouch for them not being as vibrant as people say, they are more noisy than vibrant.
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Old 03-23-2008, 01:11 AM   #17
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Yeah scott installed them with his new diff swap.
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Old 03-23-2008, 02:46 AM   #18
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Got mine from corksport when they were a little cheaper, but they're worth it 100% IMHO. Only slightly more vibration than stock worn out broken mounts..
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Old 03-23-2008, 12:12 PM   #19
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I was considering installing the Mazda Competition Motor mounts and Differential mounts, time to replace all those 'little things' that have gotten old. They advertise a 40% improvment over stock.

So, will these ad much to vibrations in the overall? Considering that worn out motor mounts cause a lot of vibrations, what would really be the difference when getting rid of the old mounts and the vibrations they are probably causing vrs what new mounts that are slightly stiffer? At some point, even the new mounts should soften some, or am I in the wrong frame of thinking with the newer materials being used these days?
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Old 03-23-2008, 12:45 PM   #20
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Quote:
Originally Posted by 93inNM View Post
I was considering installing the Mazda Competition Motor mounts and Differential mounts, time to replace all those 'little things' that have gotten old. They advertise a 40% improvment over stock.

So, will these ad much to vibrations in the overall? Considering that worn out motor mounts cause a lot of vibrations, what would really be the difference when getting rid of the old mounts and the vibrations they are probably causing vrs what new mounts that are slightly stiffer? At some point, even the new mounts should soften some, or am I in the wrong frame of thinking with the newer materials being used these days?

read my above post...
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