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Z1 Subframe Collars: Snake Oil or Viable Shortcut?

Came across these the other day while looking at differential bushings: https://www.z1motorsports.com/transm...r-p-12015.html The principle is simple enough. Rather than drilling out old bushings to fit poly/solid bushings, fill the gaps

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Old 10-11-2017, 04:21 PM   #1 (permalink)
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Default Z1 Subframe Collars: Snake Oil or Viable Shortcut?

Came across these the other day while looking at differential bushings:

https://www.z1motorsports.com/transm...r-p-12015.html

The principle is simple enough. Rather than drilling out old bushings to fit poly/solid bushings, fill the gaps in the original rubber pieces to prevent less movement and offer more feedback. At first blush its deceptively obvious - if this solution actually works, why didn't anyone develop it before?
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Old 10-11-2017, 04:38 PM   #2 (permalink)
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They aren't snake oil and they aren't the first people to do collars for rear sub-frames.

Their design though does fill in the inner voids down in the bushing where it can, haven't seen collars like that before.

Viable short cut for sure.
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Old 10-11-2017, 10:26 PM   #3 (permalink)
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Agreed, not snake oil at all. However for our chassis it is not needed as much compared to cars that have modular 2 piece subframes like on VW's and Honda's (s2k, vw golf most notably).

With this, it's more of a bushing insert for reducing drive train slop, this doesn't work in the same fashion as bolt isolators to reduce excessive alignment changes. which increases steering and suspension slop.

In this case this is not a serious upgrade.
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Old 10-12-2017, 01:21 AM   #4 (permalink)
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Quote:
Originally Posted by MaysEffect View Post
Agreed, not snake oil at all. However for our chassis it is not needed as much compared to cars that have modular 2 piece subframes like on VW's and Honda's (s2k, vw golf most notably).

With this, it's more of a bushing insert for reducing drive train slop, this doesn't work in the same fashion as bolt isolators to reduce excessive alignment changes. which increases steering and suspension slop.

In this case this is not a serious upgrade.
Disagree. Even the video shows why its a legitimate upgrade.....
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Old 10-13-2017, 12:56 PM   #5 (permalink)
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I didn't say it wasn't legitimate, i said not as serious as for some other cars.
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Old 10-13-2017, 01:11 PM   #6 (permalink)
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I've already ordered mine, but I'll be doing a number of things at the same time. Their Diff bushing, transmission bushing, and doing the clicking axle fix.
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Old 10-13-2017, 05:01 PM   #7 (permalink)
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Keeping my one little good eye on the product reviews.
Seems like a viable easy low cost upgrade to solidify the suspension.
Don't know how well it will do for racing or drifting.
Everyday handling mode... maybe

I've got the Diff bushings, Engine mounts and trans mounts done with a notable difference in how more solid acceleration is and with much more vibrations in the interior.
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Old 10-14-2017, 02:39 AM   #8 (permalink)
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Quote:
Originally Posted by Senna-F1 View Post
I've already ordered mine, but I'll be doing a number of things at the same time. Their Diff bushing, transmission bushing, and doing the clicking axle fix.
How do u fix a clicking axle.
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Old 10-14-2017, 08:56 AM   #9 (permalink)
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How do u fix a clicking axle.


FIXED: Rear axle click clunk noise


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Old 10-17-2017, 10:44 PM   #10 (permalink)
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Quote:
Originally Posted by Senna-F1 View Post
I've already ordered mine, but I'll be doing a number of things at the same time. Their Diff bushing, transmission bushing, and doing the clicking axle fix.
Definitely report back on before/after and first impressions of all these mods. Have had my eyes on these mods for a while.
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Old 02-12-2018, 11:48 PM   #11 (permalink)
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Bump any updates?
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Old 02-13-2018, 02:26 PM   #12 (permalink)
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Installed these a few weeks ago. I like them as a mod, but as far as offering a truly dramatic difference, I haven't noticed that. I'm a little more stable with a little less wheel hop, and that's a good thing. I also haven't really been able to test the limits thanks to cold/wet conditions in eastern PA lately. This was a pretty easy mod to do, and fairly cheap.
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Old 02-13-2018, 02:57 PM   #13 (permalink)
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I have installed them very recently, however, I am not sure how exactly it affected the car as the whole car feels stiffer with less flex (changed the bushes to poly + solid diff bushes + Z1 collars).
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Old 02-15-2018, 12:10 PM   #14 (permalink)
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I just added a review of these here...
Z1 Subframe Bushing Insert/Collar Review
Hope this helps!
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Old 04-04-2018, 12:37 PM   #15 (permalink)
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Installed mine this week but can't give a unbiased opinion as I also installed 11" wheels wrapped in 325 rubber which I only drove on for 5 miles before tossing the collars in.
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