Torsen differential Q's

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Postby TomsGT4 » Thu Apr 28, 2005 4:31 pm

There were some improvements to the E150F transaxle over the E50F2 used on the 1st gen 3SGTE.
Basically gear ratios differ for the 1st two gears, and they used a 5-pinion center defferential over the previous 4-pinion type on the E50F2.

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1990 ST185
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Postby TomsGT4 » Wed May 04, 2005 2:52 pm

BoostedBlueToyotas wrote:Tom, I really think you should take a picture of that entire manual
and send the pictures to me :D , even Gary dont have those
pictures :lol:


I'll eventually get around to scanning the relevant pages in & host them in the FTP download section of the forum.
Scanner is broke right now though... :doh:
Tom
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Postby saved_1992 » Tue Aug 23, 2005 3:51 pm

i have found if you try to move both rear wheels at the same time in the same direction, if can not move the wheels open diff if you can lsd.
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Postby beej » Wed Aug 24, 2005 12:02 pm

ok so i have heard it was an option in the US

was LSD stock in JDM? was it stock in Australia?

i know i got one, being able to steer the rear end in mud by using the throttle, and its a GrpA :D
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Postby b00staholic » Wed Aug 24, 2005 11:25 pm

My 1990 USDM All-Trac has the 737/150F code too? :shrug:
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Postby acylon » Sun Aug 28, 2005 4:51 pm

saved_1992 wrote:i have found if you try to move both rear wheels at the same time in the same direction, if can not move the wheels open diff if you can lsd.

sounds like the car was in gear when you tried the open and out of gear when you tried the lsd.
When I get my lsd and open it to verify its a lsd, I will compare it on the shop floor with my st165 open diff to see if I can get them to do anything different from one another. I will try to post my results and pics here.
Thank you community for trying to figure this mystery out.
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Postby acylon » Sun Sep 25, 2005 7:19 pm

O.K. Here it is. I found three differences between a ST165 open diff and a ST185CS Torsen diff.

First the torsen has a magnetic drain plug. It looks like indented head with a circle in the middle. If you take it out it looks like a 1/2 inch shaft coming out of the thread area.
Second there is a raised square with a raised "M" in the casting on the right side of the "1" by the drain hole on torsen.
The M is sideways to the "1" Kinda like this: E
Third there are groves on the inside of the output Shafts on torsen.

I also discoverd acouple ways to tell the difference in how they act, but they are sort of vauge. I may go into that if these differences dont pan out. I didnt have a st185 open diff so these differences could just be between st165 and st185 opens. Soooo...

If anyone who KNOWS (seen inside) they have a factory torsen could you please verify any of these findings, that would be great.

Also if some non-Torsen ST185 owners could see if any of these markings are on your diff let me know too.

If anyone with a ST205 rearend could see if these markings are on your diff. Thanks.

Pic of torsen:
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Pic of open (left) and Torsen (right)
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Last edited by acylon on Wed Sep 28, 2005 1:52 am, edited 1 time in total.
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Postby BoostedBlueToyotas » Sun Sep 25, 2005 11:21 pm

Both my torsen and open differentials have the 1 stamped on the housing
The open differential also has the plug pictured (it was definitely has
the black magnetic part on it)
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Postby acylon » Tue Sep 27, 2005 4:02 am

OK but did they have the raised M next to the 1? It is sort of faint.
Thanks for looking.
Was the open with the magnet a st185?
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Postby marty » Tue Sep 27, 2005 8:47 am

acylon: is possible to change open st165 rear diff with this st185 lsd? What mods are required please?
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Postby acylon » Tue Sep 27, 2005 12:52 pm

Yes, just buy a st205 diff and put it in. Or if you can find a st185 torsen, but you have the owner pull off the back cover and take a picture so you can see it is a torsen before you buy it.
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Postby marty » Tue Sep 27, 2005 5:51 pm

I'm asking you because I would like to run here in Czech winter championship of hill climb on snow. What difference you fell to run LSD on rear? Do you have some on front too?
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Postby BoostedBlueToyotas » Tue Sep 27, 2005 10:31 pm

OK but did they have the raised M next to the 1? It is sort of faint.
Thanks for looking.

==> The Torsen does, its is next to the 1 underneath the first cooling fin
The open differential is too rusty for me to tell

Was the open with the magnet a st185?

==> Yes, it had the same plug as pictured, HOWEVER my new torsen
drain plug is totally different, it is recessed for a allen head wrench
Tim Plessing
Columbia, MD

1990 ST185 - blue/blue cloth 152K-SOLD
1993 MR2 turbo - blue/black leather 59K TOTALLED/PARTING OUT
2006 Acura TSX - black/black 6 spd
2006 Mini Cooper S JCW Space blue/Silver roof 39k
2006 Mini Cooper JCW Silver/black roof 34k
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Postby acylon » Wed Sep 28, 2005 1:47 am

YES! That little faint M under the fin could be our ticket to identifying these friggin torsens! :D

Thank you boosted blue!

But we need more proof, we need to have an open st185 see if there is no M. And we need a Torsen st185 and to verify the M.

Marty, I love having Torsen in the rear. It seems to make the car more predictable in corners. And makes it drive alittle more lika a rear wheel drive. Better for inducing throttle on oversteer.
James Unger
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Postby BoostedBlueToyotas » Wed Sep 28, 2005 8:42 am

I have a brand new ST185 torsen in the basement (it has the 1, the M or
8 or 3 whatever, and has the allen head wrench drain plug)

My original open diff has the 1, not sure about the stamp [most of
these diff are going to be too rusty to use this] M, and has the
circle drain plug with magnetic part
Tim Plessing
Columbia, MD

1990 ST185 - blue/blue cloth 152K-SOLD
1993 MR2 turbo - blue/black leather 59K TOTALLED/PARTING OUT
2006 Acura TSX - black/black 6 spd
2006 Mini Cooper S JCW Space blue/Silver roof 39k
2006 Mini Cooper JCW Silver/black roof 34k
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