How to tell if you have an LSD?

Engines, Transmissions & Final Drive questions and answers

Moderators: timk, Stu, zombie, Andrew, The American, Lokiel, -alex, miata, StanTheMan, greenMachine, ManiacLachy, Daffy

jonosx
Driver
Posts: 61
Joined: Tue Aug 17, 2010 3:03 pm

How to tell if you have an LSD?

Postby jonosx » Wed Sep 22, 2010 3:04 pm

Whats the best way to tell if you have a torsen lsd?

The NB8A i have bought supposedly has one but i am not convinced.

My previous 200sx had a very aggressive 1.5 way mechanical lsd so it may just be a case of me being used to that and the torsen not being that good.

cheers

User avatar
Jeo
Speed Racer
Posts: 3648
Joined: Thu Jun 26, 2008 9:33 am
Vehicle: NB8B
Location: Canberra

Re: How to tell if you have an LSD?

Postby Jeo » Wed Sep 22, 2010 3:09 pm

Jack the rear end off the ground. Put it in neutral. Spin one of the wheels by hand. If the other spins the opposite direction you have a winner.

User avatar
sliq
Speed Racer
Posts: 3414
Joined: Sat Jan 13, 2007 12:33 am
Vehicle: ND - 2 GT
Location: Sydney
Contact:

Re: How to tell if you have an LSD?

Postby sliq » Wed Sep 22, 2010 3:56 pm

i can't brain today.. i have the dumb..

User avatar
RawSouth
Fast Driver
Posts: 475
Joined: Sun May 04, 2008 10:47 pm
Vehicle: NB8B
Location: Sydney
Contact:

Re: How to tell if you have an LSD?

Postby RawSouth » Wed Sep 22, 2010 4:07 pm

The best way I've heard is...

Stop your car with one of your rear wheels on a slippery surface (such as dirt on the side of the road)...
Agressive start.
If only the wheel thats NOT on the road spins... you don't have an LSD.

If both spin, you do have one!


Im not sure if Jeo's method would work with a torsen, as they act like an open diff when there is no load on it.
ロードスター

GP
Racing Driver
Posts: 1025
Joined: Tue Nov 21, 2006 10:42 am
Vehicle: ND - 2 GT
Location: Brisbane

Re: How to tell if you have an LSD?

Postby GP » Wed Sep 22, 2010 4:51 pm

Im not sure if Jeo's method would work with a torsen, as they act like an open diff when there is no load on it.

Yep, An open diff will spin the opposite way. Mechanical LSD will spin the same way. Torsen I don't know
Graham

User avatar
Regie
Speed Racer
Posts: 4259
Joined: Thu May 15, 2008 3:02 pm
Vehicle: NC - V8
Location: Sydney

Re: How to tell if you have an LSD?

Postby Regie » Wed Sep 22, 2010 4:52 pm

Jeo wrote:Jack the rear end off the ground. Put it in neutral. Spin one of the wheels by hand. If the other spins the opposite direction you have a winner.



wont work with TorSen... you need load on both wheels to get them to lock up..
MY07 NC, Mazdaspeed Body, Ohlins, Full GWR Exhaust, 17x9 RPF1's, 4.1FGR and lots lots more

User avatar
pcmx5
Racing Driver
Posts: 1648
Joined: Thu Apr 24, 2003 11:00 am
Vehicle: ND - 2
Location: Geelong Vic.
Contact:

Re: How to tell if you have an LSD?

Postby pcmx5 » Thu Sep 23, 2010 5:33 pm

Go down to a local winery with immaculate lawns, great food. entertainment and park as directed on the lawn nose first on a reasonable slope.

Enjoy the food, wine and entertainment while sitting around an open fire listening to the rain pour down.

Get in your car and gently select reverse.If you leave two bloody big grooves in the lawn it proves the LSD is in good order.Did for me!!

Peter.
.Now ND2 Roadster prev NC2 Recaro's ,BBS wheels,full exhaust, Tiens NA 1.6.NA 1.8 LE(106RWKW)NC1,NC2.ND 1.5 .

User avatar
Jeo
Speed Racer
Posts: 3648
Joined: Thu Jun 26, 2008 9:33 am
Vehicle: NB8B
Location: Canberra

Re: How to tell if you have an LSD?

Postby Jeo » Thu Sep 23, 2010 5:36 pm

Learn something every day hey.

Damn old Honda days...

User avatar
Luke
Racing Driver
Posts: 781
Joined: Sat May 23, 2009 1:11 am
Vehicle: NC
Location: Wetherill Park NSW

Re: How to tell if you have an LSD?

Postby Luke » Fri Sep 24, 2010 12:23 pm

I'll just confirm the using the jacking up method with a torsen does not work. It does act like an open centre with no load on it.

Find the best way to try a torsen diff is some nice accelaration tests in the wet as you go over the white lines at traffic lights.
If you don't want to do that I also found this sort of works.
When you accelarate at full steering lock say in a car park both left and right rear wheels chirp randomly as power gets moved left and right trying to find grip. At least mine does.
Or you can just get a driveway like mine, forces my torsen to operate every time due to the silly slopes on it.
2022 BRZ 10AE
2021 GR Yaris
2008 Peugeot HDi Lemans, Number 1027/2000, White with Red stripes

User avatar
broady
Racing Driver
Posts: 1243
Joined: Fri Jan 19, 2007 12:32 am
Vehicle: NA8
Location: Sydney NSW

Re: How to tell if you have an LSD?

Postby broady » Fri Sep 24, 2010 2:07 pm

As others say, rip some skids.
Image
人馬一体 NA8
Tein SS, Torsen T2, BD, Maxim Works→RS*R, ARC, Koyo, SSR, Sparco, Flyin' Miata & bling!

6/5/2010

User avatar
hks_kansei
Speed Racer
Posts: 6154
Joined: Tue Feb 03, 2009 10:43 am
Vehicle: NB8A
Location: Victoria

Re: How to tell if you have an LSD?

Postby hks_kansei » Sun Sep 26, 2010 2:36 pm

http://individual.utoronto.ca/stehlik/torsen.html


Sort of off topic, but I was quite confused with just how a Torsen could work, this site seemed to explain fairly well, I'm sure it leaves out a lot of the bits related to cars specifically, but it helped me know the rough concept of how they work.

Lego rocks, it's taught me so much over the years!
1999 Mazda MX5 - 1989 Honda CT110 (for sale) - 1994 Mazda 626 wagon (GF's)


Return to “MX5 Engines, Transmission & Final Drive”

Who is online

Users browsing this forum: No registered users and 110 guests