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Old 05-14-2008, 05:05 PM   #1
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Default diff bushing options

my diff is being rebuilt, and I figured I would replace the busings at the same time. Its a race car and I'd like somethign stiff. Are the mazda comp bushings the only option or is there something else?
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Old 05-14-2008, 05:24 PM   #2
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there are a few options for solid mounts: MMR and drifting jellyfish.


suspension techniques has mounts as well.
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Old 05-14-2008, 05:24 PM   #3
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I think it might have been over on clubroadster, but someone was selling some from drifting jellyfish. Might want to search for them or something.
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Old 05-14-2008, 05:46 PM   #4
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Good question, I was thinking myself...I bought ES bushing set in the GB ang it came with a set of Diff mounts...Anyone know what difference between the ES ones and the regularly available mounts like the ones previously mentioned. I want stiff mounts, so I don't know if the ES ones will do, I'd hate to change those twice.
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Old 05-14-2008, 06:48 PM   #5
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These are what are available various places:

Standard Rubber
Comp harder rubber
Energy Urethane
Delrin
Aluminum (I think? Joe Perez will make these for you for $100 )

How hard do you want?
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Old 05-14-2008, 06:52 PM   #6
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good question. stiff is good, but I'm just looking for better control and response. I'm not looking for subframe tearing stiffness. I've been in Hondas and chevys with solid mounts and they were fine. i suspect no one here has had multiple sets, but I'm open to suggestions...

looks like the common ones used are
mazda comp (which will have OE fit and finish I assume)
Drifting Jelly fish ($40 shipped) cheap, but I don't really want to skimp of $15 if there is somethign better...
Energy - these look the most complete with metal sleeves, etc.

I'm guessing any are fine?
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Old 05-14-2008, 07:05 PM   #7
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Thanks y8s, that's kind of what i wanted to know, I don't think I want solid Aluminium mounts quiet yet. Is that what Joe has in his car? I wonder what the benefits are other than increased NVH, lol.
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Old 05-14-2008, 09:27 PM   #8
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Drifting Jellyfish are comparable in quality to MMR. I can scan my shops QC sheet and material batch numbers if people are worried. I think the only difference is that mine is a natural color instead of black and I don't sell them for as much. MMR has been around much longer than me and I hear they're good guys. Can't go wrong either way. If you need some, PM me. Link on the site is down until another order comes in.
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Old 05-14-2008, 10:55 PM   #9
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im running Jake's mounts.

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Old 05-14-2008, 11:18 PM   #10
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**** SOLID DIFF MOUNTS!!!!

I just finished swapping back my oem ones from ISC's delrin soild mounts, heres why.

They suck, the rattle (esp if you have a puck clutch), they whine (highway speeds they are annoying as ****), there are no worthwhile benefits in running these vs a stiff urethane mount (imo ofcoarse).

A cheap solution, get some 100% polyurethane in a caulking tube (home depot ect ect), then fill the **** out of your old rubber mounts with this ****, then wait for them to harden (about 4 days) and BAM stiff mounts with no highway noise, whining or clunking when shifting, all for $7!!

And after running the time attack yesterday I can say they are perfect for lapping, they keep the diff planted with no side effects.
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Old 05-14-2008, 11:21 PM   #11
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Quote:
Originally Posted by dc2696 View Post
A cheap solution, get some 100% polyurethane in a caulking tube (home depot ect ect), then fill the **** out of your old rubber mounts with this ****, then wait for them to harden (about 4 days) and BAM stiff mounts with no highway noise, whining or clunking when shifting, all for $7!!
I did this successfully for my VW Golf engine mounts! It's a good, cheap solution.
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Old 05-15-2008, 01:12 AM   #12
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Quote:
Originally Posted by dc2696 View Post
**** SOLID DIFF MOUNTS!!!!

I just finished swapping back my oem ones from ISC's delrin soild mounts, heres why.

They suck, the rattle (esp if you have a puck clutch), they whine (highway speeds they are annoying as ****), there are no worthwhile benefits in running these vs a stiff urethane mount (imo ofcoarse).

A cheap solution, get some 100% polyurethane in a caulking tube (home depot ect ect), then fill the **** out of your old rubber mounts with this ****, then wait for them to harden (about 4 days) and BAM stiff mounts with no highway noise, whining or clunking when shifting, all for $7!!

And after running the time attack yesterday I can say they are perfect for lapping, they keep the diff planted with no side effects.
so are your old ones forsale?
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Old 05-15-2008, 01:19 AM   #13
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So iow you don't think that my ES urethane mounts are anything to worry about since I already have them...No need to go to solid? These should be stiff enough and not noisy?
Thanks
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Old 05-15-2008, 10:41 AM   #14
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Quote:
Originally Posted by Zabac View Post
So iow you don't think that my ES urethane mounts are anything to worry about since I already have them...No need to go to solid? These should be stiff enough and not noisy?
Thanks
there prolly fine, if you already have em Id just go ahead and use them.
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Old 05-15-2008, 12:07 PM   #15
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I have mmr diff and engine mounts. I'm not going to use them, so let me know if you want them.

[email protected]
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Old 05-15-2008, 12:39 PM   #16
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Sure Matt u want them u can have em. Shipping plus 30bux sound good?
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Old 05-15-2008, 12:43 PM   #17
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Quote:
Originally Posted by jasonrobo02 View Post
I did this successfully for my VW Golf engine mounts! It's a good, cheap solution.
Doing this to my motor mounts and the wifes civic, and I still have half a tube of this **** left, it lasts forever lol.


Best $7 I ever spent.
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Old 02-16-2010, 09:25 AM   #18
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Care to share some more details on filling the stock bushings?

What did you actually buy at HD/etc.. I've heard of people using the windshield stuff but that **** is expensive!

Also, did you just fill the bushings that are pressed in the housing, or did you try and fill the 'caps with the bumps on them' as well?

Thanks

Tim
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Old 02-16-2010, 10:13 AM   #19
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I have the Energy bushings in my track car and love them.
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Old 02-16-2010, 01:04 PM   #20
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Hey Matt,

We have Mazda Comp rubber, Energy poly, and custom SS solid mounts in stock for the Miata diff.

Are you sticking with a Torsen or going to something else? I can't wait to try one of the Caddy Getrag Posi diffs in a high HP turbo Miata...

Jeremy
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