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Old 07-04-2010, 03:14 AM   #21
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First off, the car is imported from Japan and has a lot of goodies. I would believe the car had a track purpose since it's been turbocharged, suspension has been stiffened and it has a lot of goodies (lightweight weds sport tc-05, hks oil cooler, brake cylinder brake etc..). I removed the differential today and I could clearly tell it had been already done on the car. As people say my casing looks more like an open diff, I wonder what LSD unit is in it since I know for sure it is not open.
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Old 07-04-2010, 03:24 AM   #22
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I wonder if this is an automatic 1.8 diff, square flanges and no rubber dampener.
And maybe the PO put an LSD in it...

edit: how do you know for sure that its not opened?
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Old 07-04-2010, 03:26 AM   #23
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I'll try to open it up tomorrow we'll see...
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Old 07-04-2010, 01:54 PM   #24
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I know for sure it doesn't have an open differential. Otherwise, the tail of the car wouldn't be that happy.

http://www.youtube.com/watch?v=ezjxhU8C71s
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Old 07-04-2010, 02:06 PM   #25
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Quote:
Originally Posted by kei View Post
I know for sure it doesn't have an open differential. Otherwise, the tail of the car wouldn't be that happy.

http://www.youtube.com/watch?v=ezjxhU8C71s
It would be more prone to oversteer with an open diff...
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Old 07-04-2010, 02:26 PM   #26
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More oversteer with open diff ? WTF is going on here
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Old 07-04-2010, 03:45 PM   #27
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Quote:
Originally Posted by kei View Post
I know for sure it doesn't have an open differential. Otherwise, the tail of the car wouldn't be that happy.

http://www.youtube.com/watch?v=ezjxhU8C71s
Definitely open diff.
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Old 07-04-2010, 08:37 PM   #28
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UPDATE: I just finished opening the housing, here is what I found. Does anybody recognize this ?




http://yfrog.com/judsc01687jzj
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Old 07-04-2010, 08:40 PM   #29
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Open 1.6 differential. Compare:
http://cgi.ebay.ca/Mazda-Miata-OPEN-...item439dc47946



Actually, turn yours over and take a picture for me.

Sort of looks like this one:

http://cgi.ebay.ca/JDM-Miata-T2-Tors...item20b1e82eff
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Old 07-04-2010, 08:44 PM   #30
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Maybe the housing comes from an open diff but the LSD unit does not.
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Old 07-04-2010, 08:51 PM   #31
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Quote:
Originally Posted by kei View Post
Maybe the housing comes from an open diff but the LSD unit does not.
This is a torsen in the foreground.
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Old 07-04-2010, 09:32 PM   #32
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I still think its an auto 1.8 diff
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Old 07-04-2010, 10:40 PM   #33
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are they supposed to fit in 1.6 casing?
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Old 07-04-2010, 11:12 PM   #34
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Quote:
Originally Posted by kei View Post
are they supposed to fit in 1.6 casing?
I think its the casing as well.
The auto 1.8 diff had no rubber dampener, and the axle flanges were square, with no ears.
Unfortunately, they were all opened diffs from the factory, but on the positive side, at least it wont break as easily as the 1.6 diff.
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Old 07-05-2010, 02:44 AM   #35
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Full Tilt I think there is a bit of misunderstanding let me clarify...
All the pictures I've posted are from MY differential which I think happens to be somehow broken (that's why I took it out).
Another thing people don't seem to understand is that my car is very tail-happy (you don't have to fight with the car to induce oversteer, the diff seems to lock easily) IMO that eliminate the possibility my diff would be open and as you can see on the pictures it cannot be VLSD since there is no friction plates. I am no expert but this is what I assumed having read everything I could find on the web.

Still need to know.... what is this LSD
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Old 07-05-2010, 02:58 AM   #36
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When an LSD locks, it causes understeer. An open diff will allow the car to oversteer much more easily.
I drove a 01 miata with an open diff and my own 99 miata with an LSD on the same day on the same autocross circuit, and the 01 was much more prone to oversteer, while my car was prove to understeer. I was also a bit faster in my car even though he had better tires, which can be attributed to the LSD.

Im assuming that you think that an LSD causes oversteer because of drifter influence, but thats just a misconception spread by drifter fan boys. The reason drifters use LSDs is because they are inducing oversteer through power, not by normal means of suspension tuning.
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Old 07-05-2010, 03:01 AM   #37
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Quote:
Originally Posted by Full_Tilt_Boogie View Post
When an LSD locks, it causes understeer. An open diff will allow the car to oversteer much more easily.
I drove a 01 miata with an open diff and my own 99 miata with an LSD on the same day on the same autocross circuit, and the 01 was much more prone to oversteer, while my car was prove to understeer. I was also a bit faster in my car even though he had better tires, which can be attributed to the LSD.

Im assuming that you think that an LSD causes oversteer because of drifter influence, but thats just a misconception spread by drifter fan boys. The reason drifters use LSDs is because they are inducing oversteer through power, not by normal means of suspension tuning.
Errr... I'm no expert, but I don't see the logic behind that.
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Old 07-05-2010, 03:55 AM   #38
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Whatever who's right ..(rider384 i agree).. what is this LSD unit ?
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Old 07-05-2010, 04:05 AM   #39
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Yah, I have no idea what Im talking about. Im just making this **** up as a joke.
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Old 07-05-2010, 04:31 AM   #40
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Quote:
Originally Posted by rider384 View Post
Errr... I'm no expert, but I don't see the logic behind that.
He's right. When you turn in, in order for the car to rotate you need the rear wheels to rotate at different rates - hence the need for a differential. Look at racing karts - the only way to get one to turn is to twist the chassis and lift the inside tire up. 2-way LSDs lock up the rear wheels on deceleration as well as acceleration, inhibiting turn-in and causing understeer. This is why most good racing LSDs (OS Giken, etc.) are 1.5 way, providing full lock on acceleration and a little bit of stability on deceleration, but not enough to make the car understeer.

Open diffs will not inherently cause oversteer, but a good LSD will make the car much more stable under hard braking and trailbraking while still allowing for smooth, easy rotation.

OP, even if that is a clutch diff (Mazdacomp makes one that's very common in the SM world), it doesn't really matter because what breaks in the 1.6 diffs is the ring and/or pinion. You can't transplant your diff into a 1.8 housing, either. Even if that is a $2000 LSD made of solid gold, your best bet is to sell it and buy a 1.8 Torsen (or a 1.8 open diff and install an OS Giken).
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