How to tell difference between locker and mech LSD?

[oz_cefiro]

Hi,

I have a dilemma, if this is in the wrong section, mods please move it.

My diff in my car makes clunking noises, but only when turning and moving very slowly, i.e. car park, but only when i accelerate, is this a mech LSD or locked diff?

David

[dangerous_daveo]

Id say mech diff man, prob 2way especially if you have a cefiro. If its really bad try chaning the oil, helped mine a bit.

A locker would be constantly locked, so your tyres would just chirp going round corners slow, which with effort you should be able to get yours to do.

[Duncan]

Yep definately a mechanical diff. Enjoy

[boostn32]

:bananaman :bananaman lucky score, 2 way locker for sure

[R31Nismoid]

probably better in here

-ash

[gts-wpn]

My diff makes a similiar noise to urs as well...its been like that since i bought the car, changed the diff oil once made no difference. So you guys say it is a Mechanical Diff? Whats the diff in the R33 s1 from the factory? not Mech i take it.

How do you know its 1.5 or 2 way diff?

[MerlinTheHapyPig]

2-way mech diffs will chirp on corners unless clutch is in. (as soon as u put foot on clutch, it will un-lock)

fully locked diffs ie spooled/welded will chirp always regardless. Trust me, you'll know if it's a fully locked....

factory diff is a viscous lsd, which will only lock under decent load.. and depending on how worn it is, only locks some of the time...

for a good article on diff's goto http://www.garage-13.com/difftech.html

if it's a 1.5 way, it will only half-lock on deceleration. hard to tell unless you drift it. only other way is to take out the centre and look at the shape of the plates.

[geno8r]

2-way mech diffs will chirp on corners unless clutch is in. (as soon as u put foot on clutch, it will un-lock)

That's what happens with my car. I thought it was a mech-2way because when I clutch it it rolls better in tight corners. But when I had my car up on lift I spun one of the rear wheels & the other wheel spun in the same direction making me realise it's locked.

[Duncan]

And you can tell its a 1 way mechanical if it only chirps in corners when you touch the throttle. It wont when you are coasting or braking

[grandmasterb]

ok so when i imported my car it came with a locked diff (and is still in there) i only notice it when im cornering at all and clutching does not affect it. Not 100% sure what type it is but will find out asap (as i want to know) what are the advantages and disadvantages of a locked diff for daily driving???

[geno8r]

ok so when i imported my car it came with a locked diff (and is still in there) i only notice it when im cornering at all and clutching does not affect it.  Not 100% sure what type  it is but will find out asap (as i want to know) what are the advantages and disadvantages of a locked diff for daily driving???

I questioned keeping my locked diff hey, was considering pissing it off but end up thinking the advantages are better than the disadvantages.

Advantages:

1. Always 50/50 power to the rear wheels, great for straight line dragging.

2. IF you like drift it's awesome for drift, much easier to get the tail out & keep it out.

Disadvantages:

1. Dangerous in wet, have to be VERY gentle on throttle when turning. I was changing lanes around a light corner in 2nd in the wet gently accelerating & the whole tail bloody kicked out in a flash, lucky the room I corrected in had no cars next to me...

2. Bad cornering in general, tail still wants to slip out if you're pushing it.

3. Tight turning can be annoying but its not that bad, the bad cornering disadvantage is the worst not being able to really push the car as hard as it could be cornering.

[grandmasterb]

I questioned keeping my locked diff hey, was considering pissing it off but end up thinking the advantages are better than the disadvantages.

Advantages:

1.  Always 50/50 power to the rear wheels, great for straight line dragging.

2. IF you like drift it's awesome for drift, much easier to get the tail out & keep it out.

Disadvantages:

1.  Dangerous in wet, have to be VERY gentle on throttle when turning. I was changing lanes around a light corner in 2nd in the wet gently accelerating & the whole tail bloody kicked out in a flash, lucky the room I corrected in had no cars next to me...

2.  Bad cornering in general, tail still wants to slip out if you're pushing it.

3.  Tight turning can be annoying but its not that bad, the bad cornering disadvantage is the worst not being able to really push the car as hard as it could be cornering.

yeah im still undecided as its a daily driver and get some very funny looks from people when slow driving in the middle of town and i dont really like the idea of my tyres skipping all the time when turning slow corners wearing them out even faster than normal!!!

[geno8r]

yeah im still undecided as its a daily driver and get some very funny looks from people when slow driving in the middle of town and i dont really like the idea of my tyres skipping all the time when turning slow corners wearing them out even faster than normal!!!

A good 1-way LSD not too tight but not too loose, just right 'like the cereal :bonk:' would probably be your best bet. You'll get best possible cornering & 50/50 power when enough torque is being thrown at it. I’d love one of these diffs but I don’t mind a bit of drift every now and again 'as my signature gif may suggest' so I’ll just keep my locker.

[gadget]

hey oz,

im from adelaide and if you want to meet up and ill have a quick look at it ill help you... im a qualified mech but i dont know all still learning about things but id be interested in a look..

[SandalsBoy]

Hi All,

Seeing as we are talking about diffs i was hoping to get some thoughts on a situation i have with the diff in my 32 gtr. I only picked the car up recently and the diff seems to be fully locked no matter what the conditions. Real annoying. Ive changed the oil and it made no difference. So my thoughts are that its either stuffed or been intentionally locked.

I dont know a whole lot about diffs, but i would have thought if it was "stuffed" that it would simply loose its LSD effect rather than have it permanently lock up, so i doubt this is the problem. However i also cant understand why someone would want to put a fully locked diff into a STOCK gtr.

Any thoughts/feedback would be much appreciated.

[gadget]

Hi All,

Seeing as we are talking about diffs i was hoping to get some thoughts on a situation i have with the diff in my 32 gtr. I only picked the car up recently and the diff seems to be fully locked no matter what the conditions. Real annoying. Ive changed the oil and it made no difference. So my thoughts are that its either stuffed or been intentionally locked.  

I dont know a whole lot about diffs, but i would have thought if it was "stuffed" that it would simply loose its LSD effect rather than have it permanently lock up, so i doubt this is the problem. However i also cant understand why someone would want to put a fully locked diff into a STOCK gtr.  

Any thoughts/feedback would be much appreciated.

hey,

sounds interesting.. does it skip around corners? and your right LSD's usually from my experience stop working as they wear.. like one of mine has.. but it could depend on what sort of lsd unit it is.. ill check with some sources i have and post another reply tomorrow... if you want to i can look at it depending on what i come up with.. talk soon..

[gadget]

Hi All,

Seeing as we are talking about diffs i was hoping to get some thoughts on a situation i have with the diff in my 32 gtr. I only picked the car up recently and the diff seems to be fully locked no matter what the conditions. Real annoying. Ive changed the oil and it made no difference. So my thoughts are that its either stuffed or been intentionally locked.  

I dont know a whole lot about diffs, but i would have thought if it was "stuffed" that it would simply loose its LSD effect rather than have it permanently lock up, so i doubt this is the problem. However i also cant understand why someone would want to put a fully locked diff into a STOCK gtr.  

Any thoughts/feedback would be much appreciated.

hi again..

i found out some info today.. unless yours is minispool in which case there isnt much you can do about it (besides buy an lsd unit).. heres what i can tell you

aparently the gtr's came out with five different LSD units.. viscous, mechanical and clutches are probably the most common.. clutch lsd centres if they fail they act as an open wheeler only spinning one wheel... viscous lsd centres can go either way, wither lock or open depends on what fails (i would have thought more often open wheeler) and finally mechanical ( which i think yours possibly would be) which will lock when stuffed usually.. if your experiencing under steer and skipping around corners (possibly not all the time) then id say this is what you have and its stuffed..

whatever you do dont just rip the diff out and chuck it.. people will pay top dollar for mechanical lsd units (stuffed or not) because they are hard to find.. you'd want to rebuild yours if possible.. hope it helps... let me know how you go

john

[gadget]

Hi,

I have a dilemma, if this is in the wrong section, mods please move it.

My diff in my car makes clunking noises, but only when turning and moving very slowly, i.e. car park, but only when i accelerate, is this a mech LSD or locked diff?

David

hey mechanical lsd units that are stuffed clunk around corners when moving slow

[amosite]

Sounds like preload and ramp angle change would be a good idea.

Careful but, not many shops will be able to do it correctly

[SandalsBoy]

hi again..  

i found out some info today.. unless yours is minispool in which case there isnt much you can do about it (besides buy an lsd unit).. heres what i can tell you

aparently the gtr's came out with five different LSD units.. viscous, mechanical and clutches are probably the most common.. clutch lsd centres if they fail they act as an open wheeler only spinning one wheel... viscous lsd centres can go either way, wither lock or open depends on what fails (i would have thought more often open wheeler) and finally mechanical ( which i think yours possibly would be) which will lock when stuffed usually.. if your experiencing under steer and skipping around corners (possibly not all the time) then id say this is what you have and its stuffed..

whatever you do dont just rip the diff out and chuck it.. people will pay top dollar for mechanical lsd units (stuffed or not) because they are hard to find.. you'd want to rebuild yours if possible..  hope it helps... let me know how you go

john

Hey thanks for the info. It should be taken out this coming week so ill let you know what the outcome is. Im not sure what im gonna do to fix the problem as yet... But ill let you know what the problem is and may be bounce some ideas off ya.

Thanks.