Helical LSD characteristics - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

pepsicola · 10-21-2005, 09:34 PM

From what I've been told, to check whether the car has LSD or not, I can simply jack the car up, spin one wheel and if the other wheel is spinning at the same direction then it's got a LSD, if the other wheel is spinning at the opposite direction, that means it a open diff.
Now that I've got a S15 diff in front of me, I spinned one half shaft, the other one actually spinned at the opposite direction.

Does it sound right for a helical LSD diff?
Or anyone can give me website talks more about helical LSD?
Any help would be appreciated.

***S14DB*** · 10-21-2005, 10:07 PM

is it in the car or on the bench?

pepsicola · 10-21-2005, 10:11 PM

it's not on the car, it's on the floor.. ;p

wootwoot · 10-21-2005, 11:09 PM

My hlsd does not provide the common lsd characteristic of "turn one wheel and the other spins the same way." I think it did the standard open diff dealy where the wheels spin opposite but I cant promise that

theicecreamdan · 10-21-2005, 11:20 PM

it only puts torque to both wheels if they both have traction, if one wheel lifts off the ground, or if its not on the car,it will act like an open diff... try turn the input shaft and both outputs should go the same direction right?

Flybert · 10-21-2005, 11:25 PM

Helical diffs act like open diffs when up in the air.

pepsicola · 10-22-2005, 12:44 AM

good good, just want to double check.

mellojoe · 10-22-2005, 09:47 AM

You have to hold the input shaft steady when you are testing it out, too. (ie the car in gear)

dball33 · 10-22-2005, 01:13 PM

Best way to check is to take the diff out and open the cover. There were threads with pics on how to tell if it's a hlsd. Mainly, there should be some openings on the diff but not as much as an open diff.

dball33 · 10-22-2005, 01:18 PM

Here's the thread I was talking about: http://www.zilvia.net/f/showthread.php?t=73162
The pics are from the auction I won.

10-21-2005, 09:34 PM	#1
pepsicola Join Date: Oct 2005 Location: Sydney Posts: 11 Trader Rating: (0) Feedback Score: 0 reviews	Helical LSD characteristics From what I've been told, to check whether the car has LSD or not, I can simply jack the car up, spin one wheel and if the other wheel is spinning at the same direction then it's got a LSD, if the other wheel is spinning at the opposite direction, that means it a open diff. Now that I've got a S15 diff in front of me, I spinned one half shaft, the other one actually spinned at the opposite direction. Does it sound right for a helical LSD diff? Or anyone can give me website talks more about helical LSD? Any help would be appreciated.

10-21-2005, 10:07 PM	#2
*S14DB* AFC #1 Join Date: Oct 2003 Location: 昨晩あなたのお母さんの家 Posts: 20,181 Trader Rating: (3) Feedback Score: 3 reviews	is it in the car or on the bench? __________________ Comments should be taken as Opinions not as Statements of Fact

10-21-2005, 11:09 PM	#4
wootwoot Post Whore! Join Date: Jan 2004 Location: sarasota florida biatch Age: 39 Posts: 3,850 Trader Rating: (0) Feedback Score: 0 reviews	My hlsd does not provide the common lsd characteristic of "turn one wheel and the other spins the same way." I think it did the standard open diff dealy where the wheels spin opposite but I cant promise that __________________ I'm from Florida so I'm probably a bit more strange than you

10-22-2005, 09:47 AM	#8
mellojoe Zilvia Junkie Join Date: Jan 2004 Location: ARKANSAS Posts: 518 Trader Rating: (0) Feedback Score: 0 reviews	You have to hold the input shaft steady when you are testing it out, too. (ie the car in gear) __________________

10-21-2005, 10:11 PM	#3
pepsicola Join Date: Oct 2005 Location: Sydney Posts: 11 Trader Rating: (0) Feedback Score: 0 reviews	it's not on the car, it's on the floor.. ;p

10-21-2005, 11:25 PM	#6
Flybert Post Whore! Join Date: Mar 2003 Location: none Posts: 3,862 Trader Rating: (7) Feedback Score: 7 reviews	Helical diffs act like open diffs when up in the air.

10-22-2005, 12:44 AM	#7
pepsicola Join Date: Oct 2005 Location: Sydney Posts: 11 Trader Rating: (0) Feedback Score: 0 reviews	good good, just want to double check.

10-22-2005, 01:13 PM	#9
dball33 Zilvia Member Join Date: May 2002 Location: Bay Area/Davis Posts: 198 Trader Rating: (0) Feedback Score: 0 reviews	Best way to check is to take the diff out and open the cover. There were threads with pics on how to tell if it's a hlsd. Mainly, there should be some openings on the diff but not as much as an open diff.

10-22-2005, 01:18 PM	#10
dball33 Zilvia Member Join Date: May 2002 Location: Bay Area/Davis Posts: 198 Trader Rating: (0) Feedback Score: 0 reviews	Here's the thread I was talking about: http://www.zilvia.net/f/showthread.php?t=73162 The pics are from the auction I won.