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04-06 Ralliart Engine/Drivetrain (no forced induction)

Limited slip (good news)

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Old Dec 19, 2012 | 07:24 AM
  #31  
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Originally Posted by RalliartN
Thank you Cranswick. btw, just received an oil cooler, sandwich plate, hose, and fittings from Ziggy.
what are those for, Nick? pressure monitor or feed source?

Originally Posted by lanzerralliart
So it sounds like I'll be looking for a stock differential soon. Any thoughts on cryo-treating the diff. ?
my bet is the diff carrier could be a weak link when the diff is "locked" as there would be more load on the carrier than on the gear set when the whole diff becomes a solid unit, and torque is delivered to both wheels at once...wouldn't be a bad idea if it's not terribly expensive...

my thoughts continued:

as you can see, the "thin spots" that connect one side of the diff carrier to the other, or the "spider gear housing" (where the axles connect to the diff)...this would likely be a weak spot if any...



Also, as you see by the design of the transmission, it is unlikely that any large chunks of metal, even if it were to explode, would be unlikely to pass the differential drive gear...and enter the workings of the gear shafts. in my mind a blown diff would not cause the transmission to be completely destroyed...




Last edited by CrAnSwIcK; Dec 19, 2012 at 07:26 AM.
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Old Dec 20, 2012 | 09:49 AM
  #32  
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UPDATE:

Ziggy recieved the my diff, and will be taking measurements this weekend
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Old Dec 20, 2012 | 10:51 AM
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Originally Posted by CrAnSwIcK
UPDATE:

Ziggy recieved the my diff, and will be taking measurements this weekend
Awesome!

Im stoked.
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Old Dec 20, 2012 | 10:52 AM
  #34  
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excited
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Old Dec 20, 2012 | 11:29 AM
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Nice.....

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Old Dec 27, 2012 | 09:51 PM
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by Ziggy @ RTM Racing » Thu Dec 27, 2012 9:37 am
Well, I have some good news! The DSM LSD units will fit your diff. It seems they are SLIGHTLY snug on the width. I need to pull it back out, and determine whether there are tiny burrs on your gears that just need to be stoned off (that is my guess), or else I can just grind them about .001 - .002 narrower for your diffs....
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Old Dec 28, 2012 | 07:37 AM
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Originally Posted by CrAnSwIcK
by Ziggy @ RTM Racing » Thu Dec 27, 2012 9:37 am
Well, I have some good news! The DSM LSD units will fit your diff. It seems they are SLIGHTLY snug on the width. I need to pull it back out, and determine whether there are tiny burrs on your gears that just need to be stoned off (that is my guess), or else I can just grind them about .001 - .002 narrower for your diffs....
Effin' Sweet!!! Sign me up!
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Old Dec 29, 2012 | 10:32 AM
  #38  
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Awesome effort, Garrett. Ziggy rules!

With respect to longevity of the bearing surfaces (LSD plate-to-back-of-gear), I recall from my design days that hard material rubbing against hard material isn't good, it's better to have soft-on-hard which doesn't wear nearly as quickly. I assume the spider gears are case hardened. Therefore, given it is strong enough, is the mild steel LSD unit a better choice over tool steel?

And no, the parts I just got from RTM aren't for intravenous feeding - I have good whiskey for that, like you guys showed in the Merry Christmas thread.

Last edited by RalliartN; Dec 29, 2012 at 10:36 AM.
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Old Dec 29, 2012 | 12:53 PM
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that's a good point, but what kind of material are we talking about here? strictly mild steel? what about other alloys?
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Old Dec 29, 2012 | 05:58 PM
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yeah, just talking about the two material choices Ziggy offers.

p.s. I got some car stuff being shipped here, and when they arrive we'll start (if no one else has) a thread about parts we got for Christmas .

Last edited by RalliartN; Dec 29, 2012 at 06:04 PM.
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Old Dec 30, 2012 | 12:18 AM
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can't wait, i didn't get anything, i got computer stuff :P
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Old Dec 30, 2012 | 04:28 PM
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Originally Posted by RalliartN
Awesome effort, Garrett. Ziggy rules!

With respect to longevity of the bearing surfaces (LSD plate-to-back-of-gear), I recall from my design days that hard material rubbing against hard material isn't good, it's better to have soft-on-hard which doesn't wear nearly as quickly. I assume the spider gears are case hardened. Therefore, given it is strong enough, is the mild steel LSD unit a better choice over tool steel?

And no, the parts I just got from RTM aren't for intravenous feeding - I have good whiskey for that, like you guys showed in the Merry Christmas thread.

Is tool steel softer then a case hardened steel? Also I think it's more brittle.

I bought myself a 12 year glenlevit for an iv fix
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Old Jan 1, 2013 | 09:57 AM
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These classes of steels are hardenable through a range of values, you specify to the shop what hardness level you want to achieve. Can't just say "yes or no this steel is harder than that steel". Have to ask Ziggy directly I'm sure he knows.

Enjoy the fine single malt
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Old Jan 4, 2013 | 10:38 PM
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Looking forward to this coming to pass. I will be picking one of these up for sure.
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Old Jan 6, 2013 | 06:05 PM
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I made a thread about it on club4g as well Dave, contact Ziggy @ RTMracing.com.

how's the car running by the way?
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