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4.3:1 Torsen Differential?

differential Torsen

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#1 zepic

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Posted 07 April 2021 - 09:56 AM

Hello, I have been on the search for a 4.3:1 Torsen diff on ebay and gumtree. To replace the viscous LSD in my 1992 which is a 4.3:1. But all the ones I can find are Either 4.1:1, 3.9:1 or 3.6:1. Does anyone know where I could find one?


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#2 Zed.

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Posted 07 April 2021 - 11:17 AM

believe the 4.3 with a torsen was only in a few less common 'specials'?

 

probably easier to find a 4.3 open diff (from a mk2 1.6?) then fit a torsen :mellow:

 

although the prices on a used (worn) torsen I'd look at a new plate Lsd from 3J's :yes: 

Rich.


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50 Shades of Silver. '91 NA6CE, Not a show car :driving: 
Ohlins dampers, goin drysump, EPS, 4.778:1 & more ideas than time :yes:
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https://mighty5s.com...silver-na-eunos


#3 boosted

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Posted 07 April 2021 - 11:29 AM

Mk1 eunos S special type 2 has 4.3 lsd. Very rare car. Specialist breakers poss.

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#4 tony100

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Posted 07 April 2021 - 11:54 AM

Good luck

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#5 zepic

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Posted 07 April 2021 - 05:18 PM

Well this is not going to be fun trying to hunt down the rare 4.3:1 torsen diff.


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#6 noobie

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Posted 08 April 2021 - 07:53 AM

believe the 4.3 with a torsen was only in a few less common 'specials'?

 

probably easier to find a 4.3 open diff (from a mk2 1.6?) then fit a torsen :mellow:

 

although the prices on a used (worn) torsen I'd look at a new plate Lsd from 3J's :yes: 

Rich.

 

I think the 1.6NB's were 4.1 in Europe too.

Base NB8's in the US got the 4.3 as standard, so that's your best bet for a ring and pinion set.

There is the 1.6 small pumpkin sized mazdaspeed plate-lsd too. Tend to be cheaper than torsens nowadays and 4.3

 

I would just go with a standard 4.1 OP. The difference is tiny. Speedo gears are also easy to find.


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#7 Zed.

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Posted 08 April 2021 - 10:31 AM

 

believe the 4.3 with a torsen was only in a few less common 'specials'?

 

probably easier to find a 4.3 open diff (from a mk2 1.6?) then fit a torsen :mellow:

 

although the prices on a used (worn) torsen I'd look at a new plate Lsd from 3J's :yes: 

Rich.

 

I think the 1.6NB's were 4.1 in Europe too.

Base NB8's in the US got the 4.3 as standard, so that's your best bet for a ring and pinion set.

There is the 1.6 small pumpkin sized mazdaspeed plate-lsd too. Tend to be cheaper than torsens nowadays and 4.3

 

I would just go with a standard 4.1 OP. The difference is tiny. Speedo gears are also easy to find.

 


https://www.flyinmia...vetrain/gearing

will show the overall speed differences :thumb-up: 

the early (6") diff is showing it's age now  :yes:  that said all mx5 parts have had maybe 30 years use so I'd budget for a rebiuld on an old Lsd if not a torsen :popcorn: 

Rich.


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50 Shades of Silver. '91 NA6CE, Not a show car :driving: 
Ohlins dampers, goin drysump, EPS, 4.778:1 & more ideas than time :yes:
Bodger :ph34r:

https://mighty5s.com...silver-na-eunos


#8 zepic

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Posted 08 April 2021 - 06:47 PM

 

believe the 4.3 with a torsen was only in a few less common 'specials'?

 

probably easier to find a 4.3 open diff (from a mk2 1.6?) then fit a torsen :mellow:

 

although the prices on a used (worn) torsen I'd look at a new plate Lsd from 3J's :yes: 

Rich.

 

I think the 1.6NB's were 4.1 in Europe too.

Base NB8's in the US got the 4.3 as standard, so that's your best bet for a ring and pinion set.

There is the 1.6 small pumpkin sized mazdaspeed plate-lsd too. Tend to be cheaper than torsens nowadays and 4.3

 

I would just go with a standard 4.1 OP. The difference is tiny. Speedo gears are also easy to find.

 

 

The thing is that I don't care about top speed but I do care a lot more about acceleration so keeping it at a 4.3 or even going up to a 4.4 would be good as a 4.1 would make my stock 1.6 slower.

Is it possible to buy any torsen and then change its pinion gear to get a ratio of 4.3 or 4.44?


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#9 Zed.

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Posted 08 April 2021 - 07:27 PM

Is it possible to buy any torsen and then change its pinion gear to get a ratio of 4.3 or 4.44?


Yep. :yes: 

Rich.


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50 Shades of Silver. '91 NA6CE, Not a show car :driving: 
Ohlins dampers, goin drysump, EPS, 4.778:1 & more ideas than time :yes:
Bodger :ph34r:

https://mighty5s.com...silver-na-eunos


#10 zepic

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Posted 08 April 2021 - 08:39 PM

 

Is it possible to buy any torsen and then change its pinion gear to get a ratio of 4.3 or 4.44?


Yep. :yes: 

Rich.

 

 

 

Would it fit together?

 

I have never seen this done before.


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#11 Zed.

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Posted 08 April 2021 - 08:59 PM

 

 

Is it possible to buy any torsen and then change its pinion gear to get a ratio of 4.3 or 4.44?


Yep. :yes: 

Rich.

 

 

 

Would it fit together?

 

I have never seen this done before.

 


you swap the crownwheel & pinion but it's a straightforeward process :) 

for the post '93 '7"' diff theres ratio options of 4.4, 4.6, 4.778 & 5.1:1 available, some from early Kia Sportage front diffs.

 

I've built a 4.778:1 for my car...

Rich.


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50 Shades of Silver. '91 NA6CE, Not a show car :driving: 
Ohlins dampers, goin drysump, EPS, 4.778:1 & more ideas than time :yes:
Bodger :ph34r:

https://mighty5s.com...silver-na-eunos


#12 noobie

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Posted 09 April 2021 - 07:25 AM

you swap the crownwheel & pinion but it's a straightforeward process :)

 

If your name is Rich and you've done this a bazillion times.. Otherwise its really neither straightforward or cheap :) Still working up to doing this myself.

 

@OP: with stock 1.6 chassis and power you don't need a LSD. The chassis is so floppy that you nearly always have both rear wheels in contact with asphalt. I never had any trouble doing 4 wheel slides on track with both wheels powering the car (fully open diff). Like an Elise, std theory doesn't really apply like it would on say a BMW.

Its only once you go full cage/big power/drifting that diffs really become an advantage/must.

 

You'll end up paying between 600-1000gbp for the torsen,R&P+swap for nearly no benefit. Much better to save that money towards a Blink stage 1 or VVT swap if acceleration is your goal.


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#13 Zed.

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Posted 09 April 2021 - 08:42 AM

If your name is Rich and you've done this a bazillion times.. Otherwise its really neither straightforward or cheap :)


Ok, I'll admit it's at the sharper end of diy but I believe @Niklas has fitted a 3J's Lsd in his diff assembly so possible with some thought & tools.. B) 

https://mighty5s.com/post/41459/thread

as example.... :thumb-up: 
 

Still working up to doing this myself.


get a spare diff & be brave, whats the worst that could happen? :lol:

if you want som inspiration confusion theres some wanderings on my thread https://mighty5s.com/post/40218/thread and follows on the next page (after some waffling :whistle:https://mighty5s.com/post/40346/thread

Rich.

 


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50 Shades of Silver. '91 NA6CE, Not a show car :driving: 
Ohlins dampers, goin drysump, EPS, 4.778:1 & more ideas than time :yes:
Bodger :ph34r:

https://mighty5s.com...silver-na-eunos


#14 Harvey_Tim

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Posted 09 April 2021 - 09:41 AM

Sorry to hijack this thread, but it is often said that a 30 year old Mazda VLSD will no longer be functioning but is there anything that can be done to refresh / rebuild these as they are obviously a lot more common / cheaper than Torsens?
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#15 tony100

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Posted 09 April 2021 - 09:54 AM

Bump....

I've seen some race cars mention rebuilt 'Barra' diff. Literally no idea what this means but pretty sure they need to keep the vlsd to meet the regs.

Does seem to be a gap in the market now as torsens are silly money and unlikely to retain the ratio for most 1.6 cars.

Does anyone know if these rare mazdaspeed (kaaz?) plated diffs are compatible with the vlsd gears and shafts?

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#16 noobie

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Posted 09 April 2021 - 07:02 PM

4.3 torsen on the FB-marketplace now. Pretty cheap too.


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#17 tony100

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Posted 09 April 2021 - 07:35 PM

Link or it didn't happen

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#18 zepic

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Posted 09 April 2021 - 11:12 PM

4.3 torsen on the FB-marketplace now. Pretty cheap too.

 

Found a 4.3 open diff on FB but its all the way down in Ashford. Is that the one you are talking about?


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#19 Bol

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Posted 10 April 2021 - 05:38 AM

I sold mine last year and swapped it for a 3.6 that better suited my supercharger. They came on most late imports; not just specials. My car is an Eunos S-Package, of which there are still quite a lot about. Often people don’t realise what they’ve got.
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#20 boosted

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Posted 10 April 2021 - 05:57 AM

1 poss on facebook.b4d849c935cd14c74c7a96a5660d43a5.jpg

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