St185 suspension bushings

Suspension and other discussion

St185 suspension bushings

Postby Mr Alltrac » Fri Sep 26, 2014 4:23 pm

Looking to replace all my suspension bushings
http://m.ebay.com/itm/321508271981?nav=SEARCH
Is this everything?
I will also be buying oem spherical bushings.

Where is a good place to buy motor mounts?
What about the side mounts that support the weight of the motor/trans?

Where can you get the rear subframe bushings?
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Re: St185 suspension bushings

Postby underscore » Fri Sep 26, 2014 6:14 pm

Looks like the GT4 Racing kit, for motor mounts how solid do you want them to be? Same deal with the rear diff bushings.
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It's for sale! http://www.alltrac.net/phpBB2/viewtopic.php?f=64&t=52181
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Re: St185 suspension bushings

Postby Mr Alltrac » Fri Sep 26, 2014 9:04 pm

I really wouldn't mind it hard, my rear diff is welded right now so a solid mount from xiimotorsports wouldnt be bad. Never driven in a car with solid motor mounts so I don't know how bad the nvh is.
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Re: St185 suspension bushings

Postby klue » Fri Sep 26, 2014 9:19 pm

xiiimotorsports sells bushing kits as well as engine/subframe mounts

PM me for details

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Re: St185 suspension bushings

Postby Mr Alltrac » Sat Sep 27, 2014 12:31 am

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Re: St185 suspension bushings

Postby lumbercis » Sat Sep 27, 2014 5:08 pm

As someone who is at the end of a long saga with this, my advice is to use OEM for anything that is still available. But especially the motor mounts and the rear subframe mounts (the 4 large bushings that mount the subframe to the body). The suspension doesn't work well on the street if you solid mount (poly) these bushings. I'd only recommend poly mounts for these areas if you're doing a lot of track driving, which most alltrac owners are not.

If you want a little more shift feel then I'd recommend motor mount inserts for the front http://www.kirkosaurus.com/insertspagemain.html
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Re: St185 suspension bushings

Postby warracer » Sat Sep 27, 2014 10:31 pm

lumbercis wrote:As someone who is at the end of a long saga with this, my advice is to use OEM for anything that is still available. But especially the motor mounts and the rear subframe mounts (the 4 large bushings that mount the subframe to the body). The suspension doesn't work well on the street if you solid mount (poly) these bushings. I'd only recommend poly mounts for these areas if you're doing a lot of track driving, which most alltrac owners are not.

If you want a little more shift feel then I'd recommend motor mount inserts for the front http://www.kirkosaurus.com/insertspagemain.html


I don't agree, I daily mine with complete rear solid mount/poly (aside from the OEM spherical bearing).It runs on a set of BC coilover with swift springs and its just pure awesome. I can throw the car a 100mph in a curve and it feels solid and extremely stable. We have alot of very curvy/icy/damaged road and I have no complaints, sure its definitly stiffer but the car just feels more like it initially should've been. I mean its a sports car, and a damn good one even, it shouldn't feel like a camry on the road...
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ST185H A-Spec:
-IHI VF28 -BC Racing coilover
-Yonaka FMIC -Swift Spring
-ARP head stud -St205 rear end
-Cometic Metal HG -Supra TT Fuel Pump
-3'' SS straight pipe -Poly bushing
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Re: St185 suspension bushings

Postby underscore » Sun Sep 28, 2014 3:17 pm

When I went to the solid rear end kit I didn't feel any added harshness, poly motor mounts added a little vibration at idle but that's it.
★ 1991 GTFour RC ~ "Rebel Scum" ★
It's for sale! http://www.alltrac.net/phpBB2/viewtopic.php?f=64&t=52181
Build thread http://www.alltrac.net/phpBB2/viewtopic.php?f=44&t=44216
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Re: St185 suspension bushings

Postby lumbercis » Sun Sep 28, 2014 7:23 pm

My thoughts on this are summed up here viewtopic.php?p=272243 (esp the comments from paladek on how the rear subframe is designed to float) and here http://www.mr2oc.com/showthread.php?t=414661 and some of the comments from the OP here http://www.supraforums.com/forum/showth ... on-thread.. regarding handling for the street.

Be sure and read the links in those threads as well. My feeling is that the best performance replacement for most of our rubber bushings would be higher durometer rubber like TRD used to produce (would love to see some of our vendors offer this). At the other end of the scale, Porsche did the same thing for the new GT3, maybe the best handling car in the world http://www.elephantracing.com/tool-box/ ... erview.htm Note where they used higher durometer rubber rather than poly where the rear suspension arms mount to the chassis.

On our cars, since we don't have higher performance rubber mounts available, I'd use a combination. I think the most critical thing for road feel would be to use OEM front mounts with Kirk inserts rather than full poly and OEM rear subframe to body mounts. I think it's okay to use poly in other areas (except where OEM spherical bearings are called for) but I'd still use OEM where you can and where you can't go for the SuperPro bushes which seem to be a softer durometer than other offerings. I'd then tune your strut/spring combo and swaybars to get the relative amount of handling stiffness you prefer.
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