April 24, 2019, 03:49:19 AM

Author Topic: FC3S Differential Pinion Brace (By Ray Platek)  (Read 21559 times)

Offline atli126

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Re: FC3S Differential Pinion Brace (By Ray Platek)
« Reply #90 on: January 26, 2018, 12:06:49 AM »
Got the poly installed into the s4 rear sway bar link tonight.

Hoping it all goes back together and plays nice tomorrow but I'm sure it'll be a bitch. Ol Betty white is always a bitch to work on...



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-Bret
87 RX7 5.3/t56 TII Check it out >>>>http://www.502streetscene.net/forum/showthread.php?t=181938&page=4

"no one ever said it would be cheap and easy, they just said it would be worth it"

"Whatever you do, don't lose your passion. Without it who are you?" -Me

Offline atli126

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Re: FC3S Differential Pinion Brace (By Ray Platek)
« Reply #91 on: January 29, 2018, 09:53:09 PM »
So it was pretty tough but we got it back together. Went back to the mazdaspeed diff mount vs the lucky10 custom mount setup.

I know it might not look like the 2 nuts are on there enough but when we remade the new box and tabs we used 3/8 steel and almost made it too thick. So thats the best we could do but it's a very thick wheel nut or trailer nut, it's only about w threads off from being fully threaded. We also put the gooey red lock tite on it. So I think it'll hold.

Just gotta go back to my buddy's tomorrow and put the exhaust on and drive it home!

So now it has Mazdaspeed front and rear diff bushings, 3/8s steel box and tab, delrin subframe bushings, ronin stg2 camber dog bone, pinion snubber and the s4 sway bar link with poly bushings

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« Last Edit: January 30, 2018, 06:57:08 AM by atli126 »
-Bret
87 RX7 5.3/t56 TII Check it out >>>>http://www.502streetscene.net/forum/showthread.php?t=181938&page=4

"no one ever said it would be cheap and easy, they just said it would be worth it"

"Whatever you do, don't lose your passion. Without it who are you?" -Me

Offline atli126

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Re: FC3S Differential Pinion Brace (By Ray Platek)
« Reply #92 on: January 30, 2018, 10:28:30 PM »
Fc is solid... For now hah! drove it around and home tonight and it's pretty legit. Hopefully this setup will stay clunk free for a while... At least until maybe I can swing a ronin 8.8 kit like next winter

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-Bret
87 RX7 5.3/t56 TII Check it out >>>>http://www.502streetscene.net/forum/showthread.php?t=181938&page=4

"no one ever said it would be cheap and easy, they just said it would be worth it"

"Whatever you do, don't lose your passion. Without it who are you?" -Me

Offline DrivinSidewayz

Re: FC3S Differential Pinion Brace (By Ray Platek)
« Reply #93 on: December 31, 2018, 12:29:34 AM »
You CANNOT run a solid front diff mount with rubber subframe bushings. You will rip the mounting tabs off the subframe.if you want to keep it a street car, replace your mazdacomp front mount.

hey i have a solid diff mount, with rubber subframe bushings. the diff mount bracket on the subframe ripped off. are you saying i need poly subframe bushings? or solid? so that the front diff bracket wont rip off?

Offline SOB Racing

Re: FC3S Differential Pinion Brace (By Ray Platek)
« Reply #94 on: January 29, 2019, 03:52:11 PM »
I'can't keep this setup living on mine.   I've tried reinforcing the madzacomp mount, the mount welded off the bottom of the cradle, have a pinion snubber,  I've got poly cradle mount with aluminum plate retainers holding the diff to the body etc.    But the torque of the link bar bends both the rubber mount and the link bar mounts.

Has anyone seen a design that surrounds the front of the diff and has a link on the centerline of the diff so the force excerted is straight down?
1987 RX7  4G63T Swap with 20G 11.50@122.7
1985 944 Pending a 4g63T Swap

1992 Eagle Talon TSI Retired
12.27 @ 111 on 14B
12.27 @ 113.9 on Small !6g
SOB Racing   "Sitting On Blocks"
2006 HHR "The Hearse" Lowered

Offline atli126

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Re: FC3S Differential Pinion Brace (By Ray Platek)
« Reply #95 on: January 29, 2019, 03:54:57 PM »
Nope I think it's a temp fix until the Mazda comp breaks and you have to replace it. The first one I had lasted a few seasons and years of racing. But I think the best option is the ronin 8.8 setup

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-Bret
87 RX7 5.3/t56 TII Check it out >>>>http://www.502streetscene.net/forum/showthread.php?t=181938&page=4

"no one ever said it would be cheap and easy, they just said it would be worth it"

"Whatever you do, don't lose your passion. Without it who are you?" -Me

Offline SOB Racing

Re: FC3S Differential Pinion Brace (By Ray Platek)
« Reply #96 on: January 29, 2019, 05:26:49 PM »
I have no doubt the Ronin setup would be a good fix but $2k makes one look for other options.
1987 RX7  4G63T Swap with 20G 11.50@122.7
1985 944 Pending a 4g63T Swap

1992 Eagle Talon TSI Retired
12.27 @ 111 on 14B
12.27 @ 113.9 on Small !6g
SOB Racing   "Sitting On Blocks"
2006 HHR "The Hearse" Lowered