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In that thread are a couple videos, lots of discussion, some installs and reviews. But it boils down to this:
From the factory subframes are installed quickly so as not to slow down the production line. This is done with ill fitting bolts that leaves an inconsistent mating surface between vital components. Mazda RX-7 [FD3S] Subframe Collars install between the subframe and the chassis and take up the slack left by these undersized bolts. The result is improved handling, more consistent camber settings, less vibration and improved braking.
Install Requires Lowering of Subframes (NOT Removal). Each "collar" is slid into place and the bolts are re-tightened.
Each set covers both front and rear subframes and includes 14 inserts.
Last edited by FourtyOunce; 07-15-19 at 09:33 AM.
Reason: vendor request
The collars that have one side completely flat.... what are those supposed to do?
Each one slips into a specific bolt / stud location in the subframe. The flat ones fit into the subframe where the opposite side is body (and thus flat). Those are the front four positions (A) of the front subframe and the front four positions (A) of the rear subframe.
The inserts that extend both ways fill in the area around a bolt / stud that has an area to fill on both sides. It's all very self explanatory when you get in there.
FRONT
REAR
...I can also see why that picture causes confusion - you aren't seeing the OTHER side.
Hi guys,
I'm supplying these to a shop to install, but I admit I can't figure them out based on the pictures. Do they go BETWEEN the chassis and the subframe, or on the outside of the subframe between it and the bolt head?
If the location uses a bolt, I could see just prying the subframe away enough to slip them in between the subframe and the chassis, but if it's a location with a stud, those things are long, so you'd pretty much need to drop the subframe to be able to get them in between the subframe and the body. The instructions are all in Japanese, so it's not clear which are the "A" vs. the "B" and "C" collars.
Hi guys,
I'm supplying these to a shop to install, but I admit I can't figure them out based on the pictures. Do they go BETWEEN the chassis and the subframe, or on the outside of the subframe between it and the bolt head?
If the location uses a bolt, I could see just prying the subframe away enough to slip them in between the subframe and the chassis, but if it's a location with a stud, those things are long, so you'd pretty much need to drop the subframe to be able to get them in between the subframe and the body. The instructions are all in Japanese, so it's not clear which are the "A" vs. the "B" and "C" collars.
Thanks!
BETWEEN the chassis and the subframe.
TYPE A
TYPE B
TYPE C
Peter - shoot me a PM with your e-mail address. I can send some more detailed info.
09-19-18, 11:21 AM
![[GarageAlpha] Subframe Collars for Chassis Stiffening-tnuzz3t.gif](https://www.rx7club.com/attachments/garage-alpha-336/748290d1683131800-%5Bgaragealpha%5D-subframe-collars-chassis-stiffening-tnuzz3t.gif)
![[GarageAlpha] Subframe Collars for Chassis Stiffening-b2eehp7.gif](https://www.rx7club.com/attachments/garage-alpha-336/748291d1683131800-%5Bgaragealpha%5D-subframe-collars-chassis-stiffening-b2eehp7.gif)
![[GarageAlpha] Subframe Collars for Chassis Stiffening-s110asm.gif](https://www.rx7club.com/attachments/garage-alpha-336/748292d1683131800-%5Bgaragealpha%5D-subframe-collars-chassis-stiffening-s110asm.gif)
