blackfcTII

What is the affect of a LSD on a burnout as apposed to one with no LSD?
How would it affect a TII engine by running the N350 pressure sensor untill I get a N370 or N374 pressure sensor?
Thanks for any input.

bah12

On the LSD it allows both wheels to spin posi traction it helps get better traction.
on a car without LSD only one wheel spins or gets power to it, usually the right rear.

Icemark

Posi-traction is a GM brand name for a LSD, calling a LSD a Posi or Posi traction is like calling a refrigerator a Kenmore.

And if one wheel breaks loose and the other does not, then the loose wheel gets the power, regardless of right or left. Generally it will be the inside wheel in a right or left turn. If in your case the right one breaks loose more easy than the left, you might have worn suspension or make a lot of right turns.

A LSD limits the amount that one wheel can spin without the other. So it is easier if you have sufficent power to force both wheels into a burn out.

However if you have poor traction it is pretty easy to spin both wheels regardless of if there is a LSD or not.

In some LSD's (like Torsens) the power actually shifts to the wheel with the most traction, making it very hard to break both wheels loose.
actually the engine does not care. It is the ECU that will be thinking you are boosting too early, and can make the car run rich or lean (depending on RPM and load).

blackfcTII

K, well that is wierd. I was having a argument with some one about it and that is what he said. The wierd part is that in the 91 models apparently the automatic N/A coupe did not come with LSD. But when I'm doing a burn out I do not get one tire fire. Both tires spin and the marks from both wheels are of equal length. Did a previous owner change the rear end or is LSD an option. I didn't any options in the brochures for that with the N/A automatic

blackfcTII

Hmmm, I don't know. I can't have LSD, it's not an option for my car, what do you think Icemark.

So what is the pressure sensor for then?

Icemark

No 91 models except Turbos came with a LSD according to Mazda.

And again, a LSD has nothing to do with breaking both tires loose when burning out. Anyone can do it with enough practice or luck with or without a LSD. It is simply a traction issue, not a LSD issue

blackfcTII

Well I did do a TII swap so maybe I have the extra power needed, but on my N/A I could too, not as good and my tires are new. Maybe suspension. Curious. Yeah there is no way I have LSD unless someone swapped it in befor e I owned it. That's why I was asking. I have always been told if you dont have LSD (posi) you only get one tire fire. I was just hoping I had it HA HA HA HA, Dammit. So how do you know for sure though. Any way to check the rear end out to see.

One guy once told me if you jack up the rear end (both sides) and spin one tire, with LSD that one tire would spin about one inch and then the other one would start spinning with it. But I didn't take this info to the heart because he also said posi and LSD were two different things. I always thought they were pretty much the same thing it's just Posi was a GM brand name like I think you said earlier. I don't know. Set me straight if I'm wrong. Rather stop looking stupid here by getting the facts then to keep looking stupid because somebody gave me the wrong facts ya know. Ah I'm rambling, time for bed.

too many 7's

iTrader: (5)

i have read on this forum that a small number of verts came with a lsd
although mazda never admited that it was a option
some things to look for is a tag on the pumkin of the diff (if its there anymore)
it is a lsd tag my gtu has it also heavy duty brakes is a tip off. but you should
be able to take a vin to a mazda dealership and get a printed off list of evory
thing you car came with

slpin

iTrader: (9)

stop reading those rumors made by people who just got their rx7s and doesnt know the difference between spinning 1 wheel or both.

the cars with lsd are listed in the faq... if a car that isnt suppose to have lsd has lsd... guess what, someone swapped it in!

whats next,,,, rumoring mazda put LS1 into FCs?

RETed

To properly do a burn-out test, you need to have the rear tires on TWO DIFFERENT TYPES OF (FRICTION) SURFACES.
If they are both on the same type of surface, the "open diff" will still be able to spin both tires.
This is why you're getting both tires to spin regardless.

Try pouring water under one tire and see if it still does that.

Jacking the car up and spinning one rear tire is a more sedate way of checking.


-Ted

blackfcTII

I thought they did, I've seen a few with LS1s in them, LOL, J/K

So put like one tire on gravel and one on concrete, without LSD the one on the gravel will just spin right.

classicauto

iTrader: (3)

yup