I`ve often wondered whats inside the diff, I know how its works but was curious to see inside, so i found these whilst searching, may be of interest to some people who havent seen inside.

 

 

What is an LSD???

 

It stands for Limited Slip Differential. The differential is the thing in the rear of the car that splits the power coming from the driveshaft to the 2 rear tires (a.k.a 'pumpkin' or 'carrier'...). The 240SX (with a few exceptions - see below) uses what's called an open diff. In this setup both tires are basically free to spin at whatever speed they want to, which leads to the power being delivered through the path of least resistance - The tire that has less grip (the one spinning) will get more power transferred to it which will cause it to spin more, which will cause it to loose more grip and spin more which...

 

The LSD comes into play here - It comes to the rescue by stopping the loss in grip by recognizing that one tire is spinning and then transferring some of the power to the other wheel that still has grip. The type of rear Nissan uses in their OEM applications is called a Viscous LSD, which means it uses silicone and 2 plates to operate. The simplified explanation of how this works is that there is a plate stuck on the end of each shaft - These plates spin at the same speed as the wheel they are attached to. When one wheel looses grip and starts to spin faster it creates friction between the two plates due to the difference in speed. This friction heats up the silicone floating around causing it to expand. When the silicone expands it pushes on the other plate 'locking' it to the one that's spinning. This locking is what causes the other wheel to push. The fact that both wheels are now pushing is very apparent while driving.

 

This isn't just useful to drag racers, the difference while autocrossing is even more pronounced. The car can start accelerating earlier and harder out of corners than you could ever hope to do with an open differential. Lastly, the car is much smoother (and easier) to drift...

cool learn somthing every day :thumbup:

 

We should have a daily Daz corner :lol::lol:

That ones been welded together...

Nice pics.

 

When i purchased my Quiafe diff and leader gears crown and pinion i always assumed that the crown and pinion went inside the diff but when it all arrived i was like huh?? how?? it's bigger lol.

 

The crown fits to the outside of the diff and the pinion then rotates the crown which in turn rotates the diff, well something like that.

 

then all that fits within the transfer box which is pictured there.

 

I always wondered what it looked like from the inside though.

 

Nice find :D

So what makes them whine?.

Oh the pics above the outer casing is not the actual diff.

 

That is the transfer box.

 

the big cog you see is the crown and the little one at the back is the pinion.

 

The thing the big cogs bolted to (crown) is the actual diff.

 

the top pic shows it best.

 

 

This is from what i have learnt and made out from my diff and gears i ordered. I may not be 100% accurate but it's along those lines.

So what makes them whine?.

 

No oil lol

So what makes them whine?.

 

So what makes them whine?.

 

A sequential gearbox whines but i don't think a diff does as such.

 

 

A normal H pattern gearbox.

 

 

1-5 Helical (diagnal cut)

 

Reverse straight cut. (reverse whines none else do)

 

 

A sequential.

 

All the gears are straight cut.

 

 

 

This is the really bazar part i dont get.

 

Remote control cars e.g. FG marder, i always strip the gears, they are straight cut however you can buy a helical cut set which is very expensive about £60 i think which is meant to be stronger and a better mesh so how is it straight cut is stronger for cars and the other way around for rc cars.

 

 

think you have the gearbox and diff confused buddy.

That ones been welded together...

 

Think the welded part is actually yucky messy thick oil, if you look closer it looks like cogs underneath.

My god, i'm glad i joined the forum where the technical advice is in abundance :)

 

I'm crap with such things.

 

I always wondered what an LSd Diff was too. I got a reconditioned one for my Supra cos the guy bought a new LSD Diff. I always thought LSD was the name of the Company.

 

Peter

A sequential gearbox whines but i don't think a diff does as such.

 

 

A normal H pattern gearbox.

 

 

1-5 Helical (diagnal cut)

 

Reverse straight cut. (reverse whines none else do)

 

 

A sequential.

 

All the gears are straight cut.

 

 

 

This is the really bazar part i dont get.

 

Remote control cars e.g. FG marder, i always strip the gears, they are straight cut however you can buy a helical cut set which is very expensive about £60 i think which is meant to be stronger and a better mesh so how is it straight cut is stronger for cars and the other way around for rc cars.

 

 

think you have the gearbox and diff confused buddy.

 

No, I had one go on my old 300 and it was whining. I just had it replaced but never actually found out why it was whining?.

Think the welded part is actually yucky messy thick oil, if you look closer it looks like cogs underneath.

 

Jimmy's right, it's been welded in between the teeth of the gear, so that the diff will be locked, not good for going round bends.

 

Paul