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Old 05-28-2011, 01:03 PM   #1
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Default So i broke my diff today.

So i broke my new torsen diff today. I broke the aluminum mount just like this one here.




Im going to bring it to school and weld it back then LPI it for cracks with the zyglo we have at school then im going to weld some gussets were this thing broke.

Is this a comment place for these to brake and also any reason why they brake? I was only on 5 psi when this broke coming off a stop sign.
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Old 05-28-2011, 02:48 PM   #2
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My only guess would be excessive wheel hop causing too much stress.
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Old 05-28-2011, 03:06 PM   #3
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I bought a repaired carrier from partsgroup that broke at the same spot. Looks almost exactly how Brain's and yours broke too.
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Old 05-28-2011, 03:13 PM   #4
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no wheel hop just got on it half throttle and 5psi then snap.
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Old 05-28-2011, 03:26 PM   #5
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They're manufactured to break there, hence the little notch. Common breaking point.
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Old 05-28-2011, 03:27 PM   #6
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Quote:
Originally Posted by miatamike203 View Post
no wheel hop just got on it half throttle and 5psi then snap.
I know this is rocket surgeon ****, but did you let it wheel-hop ever?
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Old 05-28-2011, 06:14 PM   #7
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lol.

Solid diff mounts FTW.
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Old 05-28-2011, 09:00 PM   #8
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Did the diff come out of a car that was involved in a big frontal wreck? If you just got the diff from a dismantler, and it came from a car that was wrecked in the front, I bet it was cracked when you put it in.

The only way those things break is from big frontal impacts, or slamming the PPF over curbs over and over again.

FYI, the 2nd gen N/A FC housings bolt right up and don't have that little notch. You just have to use a Miata bushing set.
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Old 05-29-2011, 12:30 AM   #9
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I got the diff from sixshooter.

Im looking for one of those housings for now but im going to fix mine at school and beef it up.
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Old 05-29-2011, 01:28 AM   #10
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Dam, Mine hopped a lot till I changed engine and diff mounts.
4th gear clutch kicks in the wet in a straight line (N/A) it still hops, 3rd is ok though.

To no ones surprise I have 4 Broken 1.6 diffs in the shed.

Dann
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Old 05-29-2011, 11:48 AM   #11
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I also have extra bracing as im not running a ppf.



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Old 05-29-2011, 08:31 PM   #12
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Quote:
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I also have extra bracing as im not running a ppf.



I would think without the ppf it'd break at that point very easily. The PPF keeps is stable and straight, so I can definitely see it breaking at that weak spot.
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Old 05-29-2011, 11:00 PM   #13
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I fixed everything today im going to have pics on how i fixed it tomorrow when i go to put it in.
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Old 05-30-2011, 12:16 AM   #14
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As Dustin said, I would not be surprised if it broke again without the PPF in there.
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Old 05-30-2011, 12:23 AM   #15
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LS1 FD guys seem to not have issues nixing the PPF when they go LS1. Although they do add a new brace.
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Old 05-30-2011, 11:36 AM   #16
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Im going to have pic of the what i did to fix the broken diff.
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Old 05-30-2011, 04:20 PM   #17
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I'm going to post this piece of advice again:

If you dont want the diff to break at the notch, grind the material on the sides of the notch so it's a smooth curve instead of a sharp notch.
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Old 05-30-2011, 04:44 PM   #18
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Once you see the pics of how i did it, then you will be like ohhhh. lol

I eliminated the mounting wings and made a plate going over the top of the diff and pit bolts into the diff.
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Old 06-09-2011, 10:59 AM   #19
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wow i wouldn't have thought it would break there
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