New source of Torsen T2 LSD's

Piratetip

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Ah there it is.
The inside surface finish I thought would give away it's manufacturing method.

You were correct, these covers were either an afterthought or they knew only a small number were to be made.

That surface finish to me looks exactly like lost foam sand casting.
Which also explains the bumpy surface finish you said you were having to clean up on the outside as well.
Much cheaper to manufacture than how the normal covers are made.
Al die casting.

In that closeup photo you can still see the styrofoam shape, looks exactly like packing material you would find around a TV or something in a box.
 

Hybrid

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Awesome info Nick!. Yeah funny you say the last bit....let me grab another snippet I think you will like :)

These circles with lines are everywhere throughout the casting.

Screenshot_20200526-151324~3.png
 

Piratetip

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Yeah those markings are on the foam as well.
You have seen those before on styrofoam, I guarantee it.

I took a picture of a piece of foam I have lying around here.
Has circles with dots not lines but same idea.
 

Piratetip

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Also for reference this is what die casting looks like on the inside of the normal covers.
Very smooth, but you can see wrinkles and grain boundaries on the surface.
Tell take signs.
 

Hybrid

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Yeah those markings are on the foam as well.
You have seen those before on styrofoam, I guarantee it.

I took a picture of a piece of foam I have lying around here.
Has circles with dots not lines but same idea.
You bet :). But yeah very interesting indeed I must say.
 

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Have also clear coated the decal under. It sits above the drain plug on the underside of the fin stock wise.

Screenshot_20200528-144150~2.png
 
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Hybrid

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Screenshot_20200528-144250~2.png

Note modified fins at bottom of pic. Was best I could do, it's hidden inside subframe also.
 

3p141592654

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Is the main benefit of this cover the extra protruding cooling fins or is there something more? I recall some sort of cooling contraption that stuck out of the differential on euro spec models. Is this related to that?
 

Piratetip

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It's additional cooling yeah.

The vertical heat pipe on the cast iron housing was part of that as well in EU.
But just the rear cover change would help a little
 

Hybrid

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There were also air ducts/deflectors. One bolted to the top of the subframe, and there was another under but don't have a pic of that. Both are unfortunately NLA. You can see the top one here.

IMG_0299.jpg
 

Piratetip

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Ah yup.
Nice crusty diff you got there. :D
 

Piratetip

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Finishing up another T2 Torsen diff build. :D

 

Jeff Lange

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Haven't driven one in an A70 yet, but I've driven with them in the Lexus IS, Scion FR-S, and my 1993 Previa ice-racing van and was always extremely happy with the smooth transition and grip provided by them. My favourite differential for a mix of street and track driving for sure.

(Just don't lift a wheel, or you'll have a bad time)

Jeff
 
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Piratetip

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Haven't driven one in an A70 yet, but I've driven with them in the Lexus IS, Scion FR-S, and my 1993 Previa ice-racing van and was always extremely happy with the smooth transition and grip provided by them. My favourite differential for a mix of street and track driving for sure.

(Just don't lift a wheel, or you'll have a bad time)

Jeff

Oh forgot to ask, in the Previa were you using the same Torsen as the MKII supra guys?
The 7.5" Truetrac?