Positively Maybe

Real tech discussion on design, fabrication, testing, development of custom or adapted parts for Pontiac Fieros. Not questions about the power a CAI will give.

Moderators: The Dark Side of Will, Series8217

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Honest Don
Posts: 469
Joined: Wed Aug 08, 2007 11:08 am

Positively Maybe

Post by Honest Don »

I needed to get away from the garage build and clear my head a bit.

First step is making a chuck bushing to clamp thin parts:
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Then I got some sintered iron/bronze and made a couple pieces:
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Honest Don
Posts: 469
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Re: Positively Maybe

Post by Honest Don »

The sintered pieces go between the case and the side gears.


Then I got one of these spring inserts. They’re going for around $20-$30 on ebay and claim to be intended for honda/bmw/whatever.
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My Benchmaster claims they fit Fiero/TH125c:
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Honest Don
Posts: 469
Joined: Wed Aug 08, 2007 11:08 am

Re: Positively Maybe

Post by Honest Don »

So far, so good.
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With the strap wrench on the output shaft, it takes a pretty good push to spin the spiders
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The diff is kind of a pain to get to, so I wanted to be sure. I tracked down a set of mold & die springs and replaced what the insert came with. Now the strap wrench doesn’t have enough bite to move the spiders at all.
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We’ll see how it works out in practice. I’m pretty optimistic though.
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Emc209i
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Re: Positively Maybe

Post by Emc209i »

In the spirit of positivity; great job!
ericjon262
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Re: Positively Maybe

Post by ericjon262 »

I look forward to hearing about your results.
"I am not what you so glibly call to be a civilized man. I have broken with society for reasons which I alone am able to appreciate. I am therefore not subject to it's stupid laws, and I ask you to never allude to them in my presence again."
The Dark Side of Will
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Re: Positively Maybe

Post by The Dark Side of Will »

So now you can hook up with both tires and blow your intermediate band on a WOT 1-2 upshift? :grin:

Sorry not sorry... you're running a TH125. :wink:

Is that a surface grinder you've repurposed as a horizontal machining center?

Those friction devices help prevent one wheel wonder burnouts... just keep in mind it's not actually a limited-slip device.
Honest Don
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Re: Positively Maybe

Post by Honest Don »

Emc209i wrote: Wed Oct 20, 2021 9:46 am In the spirit of positivity; great job!
Thanks!

ericjon262 wrote: Wed Oct 20, 2021 7:48 pm I look forward to hearing about your results.
It'll be a little while until I can get it installed. Going to try and trench for utilities this week.

The Dark Side of Will wrote: Wed Oct 20, 2021 8:25 pm So now you can hook up with both tires and blow your intermediate band on a WOT 1-2 upshift? :grin:

Sorry not sorry... you're running a TH125. :wink:
"Those things catch fire, don't they?" :wink:

The Dark Side of Will wrote: Wed Oct 20, 2021 8:25 pm Is that a surface grinder you've repurposed as a horizontal machining center?
It's always been a horizontal mill. However, the current motor is repurposed from a treadmill and the DRO is a repurposed phone mixed with arduino magic.

The Dark Side of Will wrote: Wed Oct 20, 2021 8:25 pm Those friction devices help prevent one wheel wonder burnouts... just keep in mind it's not actually a limited-slip device.
I figure it's worth a shot since I'm already going through the extra th125. I don't have traction problems now, but the turbo doesn't really come up until I'm almost at the 60' mark. I expect that to change when I get the new converter in. And I didn't want to put a new converter in an old transaxle, so here we are. I'll do a build thread when it's a little further along.
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