Amazing Miata Open Diff

[jboss]

Originally posted by miata619drifter
Simon-AE86, there is more than one type of mechanical LSD...have you ever heard of a helical-type LSD?

a torsen may be a type of mechanical LSD, but that does not mean all mechanical LSD's are torsen

helical=planetary gears=torque biasing=atb=quaiffe=peloquin=torsen

they are all slight variations on the same thing.

All of them fall into the mechanical category---which also include clutch-pack or clutch type diffs.

then there are viscous diffs

then there are active electronically controlled diffs--can be mechanical or viscous..


etc etc etc

[miata619drifter]

oh well, what do ya know? NISMO makes a MECHANICAL 2-WAY LSD!

http://www7.plala.or.jp/tok/silvia/g...ecsheet-e.html

who are you going to believe? Simon-AE86...or...NISMO???

[jboss]

actually, the nismo website says it is a prototye......so whethe they make one YOU can buy is questionable.

And, all diffs are 2 way diffs. Meaning that they work under both braking and accelerating forces....
However, companies use the phrase "2 way" is used to describe a diff that has different charachteristics when loaded from acceleration than when loaded from the driveshafts.

I cant think of a better way to describe it so, I use loaded from the driveshafts to describe what happens when one wheel locks up from using the brakes and the other does not. If the diff behaved the same way when reverse loaded like this as it does under acceleration, the diff would lock when one wheel stops spinning and make both wheels lock up.
Clutch type diffs with mild trailing ramp angles act similar to open diffs under this type of loading.
Aggressive leading and mild trailing ramp angles are popular for rallyists and I would think this is also the type of setup you might want for drifting....

Hope we all know a little more about diffs now.

[miata619drifter]

well MUGEN makes a mechanical 2-way you can buy:

http://www.randdmotorsports.com/muge...nsmission.html


and apparently a mechanical 2-way is available to buy for WRX's:

http://www.j-garage.com/4110.htm
(entry 1994.11)

[Simon-AE86]

Originally posted by miata619drifter
Simon-AE86, there is more than one type of mechanical LSD...have you ever heard of a helical-type LSD?

a torsen may be a type of mechanical LSD, but that does not mean all mechanical LSD's are torsen

this just proves that you are a thick idiot.

Helical diff's are TORSEN in design, or quaifs or torque sensing, or gear drive diff.. its all the same *Censored**Censored**Censored**Censored*

[Simon-AE86]

Originally posted by miata619drifter
well MUGEN makes a mechanical 2-way you can buy:

http://www.randdmotorsports.com/muge...nsmission.html


and apparently a mechanical 2-way is available to buy for WRX's:

http://www.j-garage.com/4110.htm
(entry 1994.11)

im yet to be proven wrong. all two way diffs (mechanical or whatever they state on the company websites) are a clutch pack based diff.

torsens are not 2 ways in the same sence that a clutch pack is.


Spot the arrogant american here...

[miata619drifter]

ok, you can say they're the same thing.

but would you care to comment on Mugen making a 2-way mechanical LSD? how about the one for the subaru?

i thought you said there is no such thing as a 2-way mechanical LSD?

[miata619drifter]

Originally posted by Simon-AE86


Mechanical diff's are Torsens, Torsens were made for the FD ONLy and not the FC

the other thing is Torsens cannot and i repeat CANNOT be 2ways.

those websites proved you wrong. not me.

i'm not arrogant, you just cant admit that you were wrong. plain and simple. first you said "there were never any non-turbo 89-91 RX-7's" and you were proven wrong.

then you said what's in the quote i put up, and i found websites that contradict what you say.

it takes a bigger person to admit they were wrong.

[Simon-AE86]

Originally posted by miata619drifter
ok, you can say they're the same thing.

but would you care to comment on Mugen making a 2-way mechanical LSD? how about the one for the subaru?

i thought you said there is no such thing as a 2-way mechanical LSD?

quite simply here in australia mechanicals are reffered as torsens and helical diffs.

they say mechanical 2 ways but really its a clutch pack diff.

also. once again the australian market did not see any non turbo S5's,

[jboss]

instead of getting into the semantics of it al. Why don't you go back and read my post above that explains 2-way diffs.....I went ahead and editied it to make it more clear.

[miata619drifter]

well, i for one am ready to let this thread go. it's an argument over insignificant details anyway.

lets all just get back to posts about how cool drifting is!

[Chas]

Originally posted by miata619drifter
lets all just get back to posts about how cool drifting is!

Sounds like a plan.

[Forge_55b]

back to the topic the open diff thing is cause the 50/50 weight thing but maybe thats not the exact reason.....im guessing there might be some weight biased on one side of the car....maybe the one thats not under load or whatever.....anywho the miata owns and hopefully i can get the showy drift thing going and represent hehe

[Haku]

I've just started drifting and got the hang of sliding around turns, nothing major, but i know my car needs more control, i wanted to buy a diff, but i was told to get a mechanical one. what should i be lookin for exactly. oh and JAPANPARTS.COM sells the NISMO 2-WAY LSD. any help with lsd's would be appreciated

[f8ldzz]

Gee, lots of misinformation here.

1) There was no such thing as a non-turbo sold in Japan. All JDM FC3S were turbo'd. Non-turbos FC3S were officially sold in Europe and North America.

2) US-Spec Kouki FC3S turbos used viscous LSD's. I can't confirm if the US-Spec Kouki non-turbo FC3S came with VLSD's, but I know all the US-Spec Kouki FC3S turbos were all VLSD's.

3) Torsen LSD's were used in the Infini IV (previous Infini also?) limited edition in Japan. So the Torsen was technically used in an FC3S.

The term "mechanical" LSD doesn't mean anything specific.
I would think it would not be an "electronic LSD", as there are electronically acutuated LSD's out there.

Torsens are better known as "helical" LSD's.

Your Miata can use the Torsen available in the M-Edition(?).
This is probably the cheapest option to find one used.

Ignore the comments about the NISMO units.
Nismo parts are specifically made for Nissans, and I doubt it'll fit in a Mazda.

Oh, and back to the first question in the thread, you *can* do a burn-out with an open-diff and spin both tires.
If you keep the car in a straight line and accelerate hard, most likely both tires will spin.
The LSD needs to see two different friction surfaces or two different wheel speeds of rotation for it activate.