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IS300 Torsen LSD into IS250

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Old 08-12-11, 11:22 AM   #16
Jeff Lange
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Quote:
Originally Posted by Gville350 View Post
Personal perference, I prefer the mechanical/helical gears of a Quaife LSD
Torsen LSD's are the original helical LSD. This is a Type 2 Torsen helical gear LSD.

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Originally Posted by Gville350 View Post
Jeff, have you or others done the measurements to see if a 350 final drive ring gear would at all fit on a 250 diff/300 Torsen LSD?
It wouldn't, I posted the ring gear sizes already.

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Originally Posted by evogt500 View Post
So let me get this straight, the older is300 has a real lsd and the is250 only has a semi LSD? Do you know what exactly is a semi-LSD and how is different from a torsion LSD? Its one of those mysteries on the Lexus brochure that no one really talks about. The Semi LSD and the 2-piston brake calipers on the IS250 (I only see one piston).
The IS300 has either an open diff or a T2 Torsen LSD optional. The IS250 has a preload mechanism to help with low speed traction (like on snow), after that it basically acts like an open diff. I've never seen any information anywhere that references 2-piston calipers on the IS250, they all only have single pistons. The IS300 on the other hand did have 2-piston calipers.

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Old 08-12-11, 12:53 PM   #17
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Originally Posted by Gville350 View Post
Personal perference, I prefer the mechanical/helical gears of a Quaife LSD :

http://www.autotech.com/product/oem-...arts-clearance
Can somebody explain what I am getting for $1k here? How would this make the stock 350 different in plain English?
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Old 08-12-11, 01:00 PM   #18
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^^ lol, I second that.
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Old 08-12-11, 01:14 PM   #19
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Quote:
Originally Posted by 350FSport View Post
Can somebody explain what I am getting for $1k here? How would this make the stock 350 different in plain English?
Simple give even power to the rear wheel so you get better traction. Most people dont need this for daily driven cars. Its great for the places where it snows or those who track there car. I had LSD on my ITR and M3 E46. It did wonder in the snow time for a rwd car.
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Old 08-12-11, 01:31 PM   #20
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It also affects cornering performance as well.

There is a lot of information on www.torsen.com related specifically to helical gear designs. Clutch and other designs will vary quite a bit in their application.

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Old 08-12-11, 01:44 PM   #21
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Are you guys race your IS cars? Just wondering what you guys are trying to achieve.
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Old 08-12-11, 02:25 PM   #22
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Comes in handy in general,. especially in snow conditions.

With open diff in know, one tire up in the air, you're almost out of luck by getting stuck as the wheel on the ground won't spin up. True locking diff, won't have that issue since the tire that's still on the ground will spin up.

Last edited by Sango; 08-12-11 at 02:28 PM.
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Old 08-12-11, 02:27 PM   #23
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Quote:
Originally Posted by prankster View Post
Are you guys race your IS cars? Just wondering what you guys are trying to achieve.
With a proper LSD, the power is sent to the tire with the most traction helping acceleration, turning/cornering and well as tire wear. Its not just for racing.

As for the IS250 2 piston caliper info, look here:

http://www.lexus.com/models/IS/detai...fications.html

Under Chassis\ Brake size, it clearly states:

Two-piston front calipers. 11.6-in ventilated front, 11.4-in solid rear discs.

By the way, that is Lexus's own website.

Last edited by evogt500; 08-12-11 at 02:30 PM.
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Old 08-12-11, 02:39 PM   #24
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Yeah Lexus.com's information is weird/off on a few issues. Not sure why that is.

As for why you'd want an LSD, it affects the way the car handles in more ways than just launching, etc. Superior handling (especially when tracking the car, but even just spirited driving through the mountains, etc.). It's not just for high powered cars either, there's a reason cars like the AE86 came with an optional LSD, as well as many other cars.

Torsen LSD is superior in almost all situations, that's why.

Jeff

Last edited by Jeff Lange; 08-12-11 at 02:45 PM.
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Old 08-12-11, 07:09 PM   #25
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Here's some good reading if you're at all interested at all about LSDs :

http://www.limited-slip.com/acatalog...LSD_Works.html
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Old 08-12-11, 07:33 PM   #26
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Trying to achieve this maybe?
http://www.youtube.com/watch?v=EfWi1OMmg6I

IS250 with 1.5 way LSD....
I can't think of others.. lol
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Old 08-12-11, 07:43 PM   #27
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Originally Posted by IS250TW View Post
Trying to achieve this maybe?
http://www.youtube.com/watch?v=EfWi1OMmg6I

IS250 with 1.5 way LSD....
I can't think of others.. lol
Speaking of that..

http://www.youtube.com/watch?v=ISlMOj5DUF8
http://www.youtube.com/watch?v=DFo91DHCsdw

-------------------------

This should would show how the differential worsk, lego style!

http://www.youtube.com/watch?v=lpf2pK-gGKk

Last edited by Sango; 08-12-11 at 07:53 PM.
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Old 08-13-11, 07:22 PM   #28
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A couple of parts came in today, so I spent a bit more time cleaning up this diff before it goes in my car. Still waiting for 1 of the seals, the fill plug and the case cover bolts. I reused the old bolts to get it assembled today, I'll change them out when the new ones arrive. Why am I changing them? I don't know, I'm dumb; it's best not to ask why.

Cleaned, repainted housing, IS300 axle stubs removed (these are not reused for the IS250), seals removed:



Cleaned differential cover, type 1281 silicone sealant applied:



Cover installed, drain plug installed, new side seal installed, looking relatively decent now:



Just need the last few bits and it can go into the car. At this point it's basically just an R&R on the differential carrier now, as from the outside both diffs look essentially identical. It's the inside that counts though .

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Old 08-13-11, 10:01 PM   #29
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looking good keep us updated
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Old 08-14-11, 03:59 AM   #30
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Looking really good. I'm really interested in how this turns out.
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