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Discussion Starter #1
Okay I did a search and I got different information from different threads.

So just a couple of questions?

I can get my hands on a JZA70 Diff, I emailed the guy and confirmed that it is a Torsen diff.
I'm currently running an N/A 4.3 LSD.

What exactly would be involved in changing the diffs?
I've read that you can just change the centre and reuse the casing.
Bishop92T said:
Yup, and it's just the internals, you have to reuse your stock housing.
but elsewhere
drjonez said:
use the clutch pack diff and send me the torsen! ;)

what about swapping ring gears? i was under the impression that you couldn't use the torsen w/o the whole subframe as it mounted differently. either way, if you want to sell the torsen, LMK.
As much info on swapping the diffs as possible would be appreciated.

Oh and one more thing. I've found (with expirience) that people will say anything to sell a product, So how would I be able to tell if the diff is a torsen or not? here is thread that has a pic of torsen and non torsen, but which is which, and why?
http://www.supraforums.com/forum/showthread.php?s=&threadid=71495&highlight=torsen+diff

Thank.....Sam
 

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Boost Dealer
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The two diffs are directly interchangeable. I have both and have
swapped them out. Anyone who says otherwise doesn't know
what they are talking about.
 

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Discussion Starter #3
Okay I did some more searching, and I found answers to alot of my questions.
Just some clarification needed please.

Were all JZA70's torsen diff? or just particular models(R)?


Thanks...Sam
 
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This is the torsen differential.


You see the gears inside that open area? That's why the torsen doesn't wear out.
 

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Discussion Starter #5
jtamulis said:
The two diffs are directly interchangeable. I have both and have
swapped them out. Anyone who says otherwise doesn't know
what they are talking about.
How were the 2 diffs different? I mean in the way they effect handling and takeoff etc.
 

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boost freak
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my earlier quote was wrong. the whole pumpkin is identical, the diff units themselves are the same form factor.

www.torsen.com should help ya.....the torsen is a great road racing diff, not a drag racing diff. if you want to drag race or drift, get a spool or tight shimmed clutch pack. they'll provide more even power distribution.
 

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How 'bout this. What are the real-world observed benefits of swapping the original diff for this JZ torsen-type diff? With this torsen diff, it applies the most torque to the wheel with the best grip. Can you "even more basicly" inform the audience how this benefits RRace and not DRace?
 

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SF in my veins... sigh
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All the research I have come across says that the only downside to a Torsen when dragging is strength. The worm gears aren't big on being shock loaded if they aren't built for it, and as such there have been reports of guys blowing up the JZA70 Torsen diffs under extreme drag use. (I have no direct info on this... only second hand)

There are Torsen diffs built strong enough to handle this type of application, but from what I gather the stock JZA70 one isn't one of them (when you get into the upper power ranges). I put mine in for road racing... where the Torsen shines over anything else. I am sure the stock Torsen will handle what most people here will throw at it... but if you're going to drag all the time with slicks and big torque... you might melt one down.

This is only what I have gathered in a lot of discussing / researching this topic.
 

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Discussion Starter #11
Thanks for the info guys.

So does anyone have any first hand expirience with both Diffs?
 

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powered by
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I've had both a 3.73 lsd and later the 4:10 torsen, it's hard for me to compare the two as the car was changed from 7m to 1j at the same time as the diffs and the ratios being different, but.. The torsen seems to be able to allow me to lay down the power and still be under full control of the car, it never feels like the rearend is uncontrollabe, I never felt like that with the clutch pack one. Even while the rear tires are spining the car just feels like its under control. Thats the biggest thing I notice. I am pretty certain they only came in turbo R models.
 

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Buddy thought I had a NA
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humm i find tortion to be a better diff if you don't blow it up and they drag better too if you have the tires to drag wiht and stuff

who wants a hihger lock up i don't
 

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1000whp envy
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heres a question why is it possible for the mk4 guys to have high hp cars and run a torsen and not break, while every one has said that the jza70 torsen can break and not hold up?
 

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streetknight said:
heres a question why is it possible for the mk4 guys to have high hp cars and run a torsen and not break, while every one has said that the jza70 torsen can break and not hold up?
Bigger I believe :) (not 100% sure... I'd like to put one side by side) And as for the JZA70 torsen... it's still very tough... you will have to put a lot of power through it before you kill it. Remember the JZA70 diff was designed for ~280hp... and with typical Toyota over engineering.... nuff said.
 

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I have a torsen diff in my shop that had 550hp run through it in japan. Hopefully i will find out if it can handle more...alot more. I have 3 or 4 laying around the shop, sine it is always nice to have a few spares.
 
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