what's the difference between LSD equipped car vs non-lsd equipped?

i know lsd lets power to one wheel that has more traction once other wheel has no grip

but. car with no lsd ..do tires spin same speed the whole time? even during corners?

 

http://auto.howstuffworks.com/differential.htm

 

^^^^^ That site rocks.

 

yeah i know i been there already..

"To transmit the power to the wheels while allowing them to rotate at different speeds"

soooo is this saying.. non lsd can't do this?

 

Limited slip differentials limit the amount of slip between the drive wheels.

An open differential does not limit this slip, and can (and will) allow all of the power to go to the wheel that does not have traction.

Did that make any sense?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Reid &raquo;</TD></TR><TR><TD CLASS="quote">
Did that make any sense?</TD></TR></TABLE>
Perfect sense.

 

one wheel peel FTW

 

yes made sense.

but what i really want to know is.
the actual speed of each wheel during corners.. lsd vs non
so for example. a gsr and a itr taking same corner. what's the difference?
will the gsr wheels be locked together and spin at the same speed ?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by itr1244 &raquo;</TD></TR><TR><TD CLASS="quote">but what i really want to know is.
the actual speed of each wheel during turning .. lsd vs non</TD></TR></TABLE>

You're making this far too difficult. Read what I wrote above. This is true in all situations.

What makes you think that the differential would somehow act differently in a corner?

 

well i should be more clear.

ok. when you're making a corner. inner wheel has shorter distance compared to outer wheel so the inner wheel spins slower than the outer.

so what i want to know is.. it this LSD's job..? or will all cars do this?
to allow inner/outer wheels to spin at different speed during corners




Modified by itr1244 at 11:17 AM 8/8/2007

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by itr1244 &raquo;</TD></TR><TR><TD CLASS="quote">yes made sense.

but what i really want to know is.
the actual speed of each wheel during corners.. lsd vs non
so for example. a gsr and a itr taking same corner. what's the difference?
will the gsr wheels be locked together and spin at the same speed ?
</TD></TR></TABLE>

General knowledge (regardless of LSD or not):
When turning in circle, the outside wheel needs to spin faster than the inside wheel, because the outside wheel needs to cover a larger circumference within the same time than the inside wheel. To allow the 2 wheels to spin at different speed, we need a "differential".

Open diff allows the 2 wheels to spin at different speed; however, it also lets power to flow to the wheel with less resistance. If one drive wheel is on oil and the other wheel is on grippy pavement, the slippery wheel would keep spinning while the grippy wheel stays still.

To apply this to cornering, weight transfer puts more weight on the outside wheels, so the inside wheel has less weight and less traction. Open diff lets power flow to the inside wheel (less traction) and the more you gas it, the more the inside wheel would slip.

LSD prevents this from happening. When you gas it in corner and the inside wheel tries to slip, LSD stops it. The inside wheel will rotate at the same speed as the outside wheel, but at the same time, the LSD will split up the torque between the drive wheels.

Power = Torque x RPM x constant
(RPM means wheel speed, not engine speed)
So even though both wheels spin at the same speed, with different torque applies to them, there would be a Power differential that would yaw the car and helps you get around the corner.

I tried to make it as simple as possible....... I did.
HTH.

 

yeah that's what i just thought..

to allow wheels to spin @ each speed .. is the "differential"'s job not the lsd.

i was just being stupid. i thought No lsd means no differential for second haha..

 

the wheels will spin at different speeds around a turn with or without LSD. open differentials just do not have the ability to transfer torque to the wheel that grips. if one wheel slips, ALL AVAILABLE TORQUE is sent to that wheel...which = one wheel peel. LSD is able to transfer torque to the wheel with grips so all the torque IS NOT sent to the slipping wheel.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RTW DC2R &raquo;</TD></TR><TR><TD CLASS="quote">the wheels will spin at different speeds around a turn with or without LSD.</TD></TR></TABLE>

Theoretically LSD tries to keep both wheels spinning at the same speed. That's why for aggressive LSDs (clutch pack especially) you will hear the clanking at parking lot tight turns.

 

you guys are so smart. I just got a lesson in LSD 305... this is past that 101 $h*t.....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Wai &raquo;</TD></TR><TR><TD CLASS="quote">

Theoretically LSD tries to keep both wheels spinning at the same speed. That's why for aggressive LSDs (clutch pack especially) you will hear the clanking at parking lot tight turns.</TD></TR></TABLE>

as noted in that article, if the wheels didnt spin at different speeds, then it puts a lot of stress on the axles and drive train. and as you mention some diffs out there allow you to "tune" how much slip you want. and if tuned aggressively, then you will get that clanking. I remember my first encounter with an Integra with a welded diff...I thought the car was broken lol. even the slightest turns yielded wobbling and clanking from the front of the car (unless under acceleration). I believe that clanking actually comes from the axle joints?

 

With LSD everything is technicolor and groovy. Cops have fangs. Priests have devil tails. You can see the grass breathe. It's a trip, man.

 

^^ LOL