This LSD is really bugging me!!!!

Post by **NEED4BOOST** » Wed Feb 19, 2003 12:29 pm

Okay guys I'm not sure if my 240sx is equipped with the LSD option. Some of you know that I have asked this before in the technical forum but I only got a couple of responses in the past few weeks :pface but didn't answer my question.

Well I can easily do a 2 wheel burnout but in the past couple of days we had snow and I took the 240 out to play in a parking lot and practice controlling the car. Anyway when I was pulling out and began to turn the wheel I lost traction and only one wheel spun. But when I backed the car straight(!) and then proceeded to move forward once again both wheels spun as fast as I pressed the gas! WTF, I can figure out what the deal is. Is this the behavior of a VLSD? also it seems to be biased towards the left rear wheel but today the right rear seemed to catch before the left.

Im frustrated because I can't figure whether or not I really have a VLSD....help

Post by **MikeS14240sx** » Wed Feb 19, 2003 12:29 pm

You don't have a LSD..... If you had a lsd when you turned the other wheel would have also been spinning. When you were going straight both wheels may have been spinning only because they both had the same amount of traction.

Post by **UncleBen** » Wed Feb 19, 2003 12:29 pm

its been my experience though that if you dont' have LSD, neither wheels will EVER spin freely hardly. in my car at least. whenever i break traction, 2 wheels never spin. it sounds like LSD, and yet it doesn't. i really don't know. try the method of jacking the entire rearend of the car up, and spinning one of the wheels. if the other wheels on the other side spins the opposite direction (i think thats right) then you do have LSD.

Post by **myRed240** » Wed Feb 19, 2003 12:29 pm

"if the other wheels on the other side spins the opposite direction (i think thats right) then you do have LSD."

I don't think that is true about LSD, but I am not quite sure. As far as I know, if you have LSD you should never experience one-tire slippage/spinning while turning. At least that's what I thought LSD was for.

Post by **yellow_jacket** » Wed Feb 19, 2003 12:29 pm

You are somewhat correct. You can break them free with enough power, but you do not have LSD. And yes both tires will spin in low traction situations. More rare in higher traction situations because as soon as one of them looses grip all power will be transferred to that tire.

Website · Post by **daniel240** » Wed Feb 19, 2003 12:29 pm

actually you have it turned around, if you jack the car up and spin one wheel and the other spins the opp direction then you do not have LSD.

Website · Post by **daniel240** » Wed Feb 19, 2003 12:29 pm

i heard that you can tell by your vehicle id # located in the engine bay on the passengers side, if the 18th digit is an A,C,or F than you do have lsd, if its a B, D, or anything else you do not.

Post by **S13Ka24e** » Wed Feb 19, 2003 12:29 pm

How many miles on your rear end? If you haven't replaced your diff's oil then I would do so with the correct fliud. (it has to be the stuff with silicon) Or if you just replaced the fliud did you use the right stuff? Finally how long had you ran the car at the time. The stock LSD uses the silicon to heat up and get the wheels to spin together, so if the diff was not hot enough then your LSD wasn't working.

edit: Rereading this I assume that it was the fact that your cars diff wasn't warmed up.

Luke · Post by **Luke** » Wed Feb 19, 2003 12:29 pm

How about look at the differential itself and look for the bright orange sticker that says "Viscous LSD"

Post by **NEED4BOOST** » Wed Feb 19, 2003 12:29 pm

Luke wrote:How about look at the differential itself and look for the bright orange sticker that says "Viscous LSD"

Haven't looked but can't those fall off?

S13Ka24e...

I have recently changed the fluid in the rear diff. I used Mobil 1 synthetic rear diff. gear oil. I don't know if that has anything to do with it.

Also about the gear oil heating up, it does it when its cold or warm. I am beginning to believe that I don't have a VLSD but the car handles extremely well for not having a VLSD.

Has anyone upgraded to the 300zx TT LSD? And if so how is it for road racing (tracks)? Or are there cheaper better options or better options for the same price?

Thanks guys!

Post by **NEED4BOOST** » Wed Feb 19, 2003 12:29 pm

Oh also yesterday I had gotten stuck on a really soft shoulder, well pretty much a mud pit. I was pulling to the side of the road and the car just sank in mud

Tried to drive out of it and both wheels spun. can some one explain that?

Thanks again...

Post by **MikeS14240sx** » Wed Feb 19, 2003 12:29 pm

NEED4BOOST wrote:Oh also yesterday I had gotten stuck on a really soft shoulder, well pretty much a mud pit. I was pulling to the side of the road and the car just sank in mud Tried to drive out of it and both wheels spun. can some one explain that?

Thanks again...

Consider this a free lesson. READ THROUGH THE DAMN POSTS!!!!!!!! Like someone else and i already said both wheels can spin under low or similar tire tractions conditions. WHICH IS WHY IN THE MUD AND IN THE SNOW BOTH TIRES CAN SPIN ON AN OPEN DIFF.!!!!!!!!!!

Now i know what your already thinking. "How come when i turned in the snow only one wheel spun. I thought you said snow was a low traction condition."

Well you see, when you turn weight is transferred to the outside wheels, which unwieghts the inside wheels causing less traction. On an open diff. the wheel with less traction spins!!!!!!

As for your other questions. VLSD's require a special fluid, if you had a VLSD and didn't us the right fluid i won't work properly. The outside temperature doesn't matter, the oil can still heat up in cold conditions. 240's just handle well.:pface The only difference between the 300z tt lsd and other nissan factory lsd's are the rear gear ratio.

ugh..........

Post by **UncleBen** » Wed Feb 19, 2003 12:29 pm

daniel240 wrote:actually you have it turned around, if you jack the car up and spin one wheel and the other spins the opp direction then you do not have LSD.

oh, well i new it had something to do with that. my bad :icesangel

Post by **Just another 240** » Wed Feb 19, 2003 12:29 pm

if u have a lsd, when u jack up the car and turn one wheel the other wheel will turn in the same direction. Because the lsd inside the diff. is expanding and tightening against the 2 spider gear which is connected to the drive shaft.

Post by **S13Ka24e** » Wed Feb 19, 2003 12:29 pm

NEED4BOOST wrote:S13Ka24e...

I have recently changed the fluid in the rear diff. I used Mobil 1 synthetic rear diff. gear oil. I don't know if that has anything to do with it.

Also about the gear oil heating up, it does it when its cold or warm. I am beginning to believe that I don't have a VLSD but the car handles extremely well for not having a VLSD.

That diff oil is fine for VLSD. My guess is that you don't have it. 240sx just handle well.

Post by **I am Technoman** » Wed Feb 19, 2003 12:29 pm

I just bought a j30 diff and I rebuilt my R200 to make it into a R200V. I did'nt want to deal with a lower gear I waned to keep the same ring gear. 4.086 all the way.

Post by **Just another 240** » Wed Feb 19, 2003 12:29 pm

if i have a j30, i can just rip the lsd right off and put it in my s13? cause my uncle have a j30. AHAHHAHHA

Post by **Zebrahead** » Wed Feb 19, 2003 12:29 pm

http://www.socal240sx.org/faq/1993.html

If whatever year you drive is different from the link I posted, change it and paste it in your internet explorer. That will tell you whether you have it or not.

Have a nice day!

Nick.

Post by **NEED4BOOST** » Wed Feb 19, 2003 12:29 pm

MikeS14240sx wrote:Consider this a free lesson. READ THROUGH THE DAMN POSTS!!!!!!!! Like someone else and i already said both wheels can spin under low or similar tire tractions conditions. WHICH IS WHY IN THE MUD AND IN THE SNOW BOTH TIRES CAN SPIN ON AN OPEN DIFF.!!!!!!!!!!

Wow great mister know it all. Maybe you can help me with this then....

Yesterday I was told to do one last test to finally determine if my car has an LSD or not. The test was to put one wheel in grass and one on pavement. Pull off hard and both wheels should spin if I have LSD, right? Well I first tested the right rear in grass, both wheels were about to spin but the left rear just chirped and the right rear got all the power. Hmmm...well I decided to repeat the test but switch sides. I know what you are thinking, only the right rear spin, wrong! The right rear was on the pavement and slightly chirped and the left rear (sitting in grass) spun like crazy.

Well there's my observations and now I am even more confused on whether or not I have an LSD. Oh and about the 240 handling well, well that isn't possible without a worhty driver (open diff or LSD)

-Seth

ps... Zebrhead on the 1997 & 1998 240sx SE's the VLSD option could be ordered without the ABS option and this was quoted by the 240 guru's at Heavy Throttle

Post by **I am Technoman** » Wed Feb 19, 2003 12:29 pm

The R200 is a damn good Diff. But yea the R200V is better.

it's well worth it to get a junk J30 Diff and build a R200V.

This LSD is really bugging me!!!!

This LSD is really bugging me!!!!

Wow you seem to know everything

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