helicial vs mechanical LSD

redl1newrx · 07-04-2007, 12:13 AM

whats the differences???

* Registered users of the site do not see these ads.

Firestrike · 07-04-2007, 12:17 AM

read this.

http://en.wikipedia.org/wiki/Limited_slip_differential

redl1newrx · 07-04-2007, 12:25 AM

Quote:

Originally Posted by Firestrike

read this.

http://en.wikipedia.org/wiki/Limited_slip_differential

explain in english please...

Firestrike · 07-04-2007, 12:38 AM

Well John, from what I read here:

The use of the word mechanical implies that the limited slip differential is engaged by interaction between two (or more) mechanical parts. This category includes clutch and helical limited slip differentials. For road racing, many prefer a helical limited slip differential, because it does not lock the two output shafts to spin at the same rate, but rather biases torque to the wheel with more grip by up to 80%

Helical and mechanical are part of the same type.

Firestrike · 07-04-2007, 12:39 AM

If you are looking for a diff that is different, it would be this:

Viscous

The viscous type is generally simpler, and relies on the properties of a dilatant fluid - that is, one which thickens when subject to shear. Silicone-based oils are often used. Here, a cylindrical chamber of fluid filled with a stack of perforated discs rotates with the normal motion of the output shafts. The inside surface of the chamber is coupled to one of the driveshafts, and the outside coupled to the differential carrier. Half of the discs are connected to the inner, the other half to the outer, they alternate inner/outer in the stack. Differential motion forces the interlocked (though untouching) discs to move through the fluid against each other.

RawCode · 07-04-2007, 12:40 AM

IIRC helical is a mechanical differential.

edit: I am too slow!

Maybe he is better off reading this: http://auto.howstuffworks.com/differential.htm

Firestrike · 07-04-2007, 12:43 AM

Quote:

Originally Posted by RawCode

IIRC helical is a mechanical differential.

edit: I am too slow!

Maybe he is better off reading this: http://auto.howstuffworks.com/differential.htm

Wow! What a find!

RawCode · 07-04-2007, 12:44 AM

here is a thread in the driveline forum FAQ too: http://forums.nasioc.com/forums/showthread.php?t=423584

soldmyboxster · 07-04-2007, 12:52 AM

I recall reading in SCC a long time ago that the fluid in a viscous differential could also be described as thixotropic. I believe it's a synonym for dilatant.

No, I'm not going to bother looking it up.

As for which is better, I've driven a Quaife ATB diff (all gears, no clutches) and a Honda OEM clutch-type diff in very similar cars (1988 CRXs) and I strongly prefer the clutch-type. The Quaife caused serious understeer under throttle. The clutch type was a little more forgiving.

RawCode · 07-04-2007, 12:55 AM

NASIOC diff FAQ http://forums.nasioc.com/forums/show...sti+front+diff

Firestrike · 07-04-2007, 01:01 AM

Haha John. Any more questions?
I say this will teach you what you need to know.
And how to use the search function maybe? lol

shortfuseWRX · 07-08-2007, 12:41 AM

do a spool john!!!!

sam

EvolvedAK · 07-08-2007, 01:04 AM

Quote:

Originally Posted by Firestrike

And how to use the search function maybe? lol

Don't even start

07-04-2007, 12:13 AM	#1
redl1newrx Scooby Newbie Member#: 121977 Join Date: Aug 2006 Chapter/Region: AKIC Location: Ak Vehicle: 2009 Impreza2.5i SWP	helicial vs mechanical LSD whats the differences??? * Registered users of the site do not see these ads.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Sti Lsd Vs Kaaz Lsd	nicolas316	Transmission (AT/MT) & Driveline	6	03-12-2008 04:39 AM
IS JDM WRX Version 2 RA non-sti Mechanical LSD or Viscous?	JDM_Scobaru	Factory 2.0L Turbo Powertrain	1	02-22-2006 02:25 AM
STI -> Mechanical LSD oil for differentials?	02WRX_BLUE	Transmission (AT/MT) & Driveline	2	04-05-2005 10:14 AM
rear diff fluid for Mechanical LSD?	jeffg	Transmission (AT/MT) & Driveline	4	05-16-2003 09:11 AM
2001 LSD vs 2000 LSD	Spectre23	Normally Aspirated Powertrain	11	01-17-2001 02:19 AM

07-04-2007, 12:17 AM	#2
Firestrike * Banned * Member#: 135785 Join Date: Dec 2006 Chapter/Region: AKIC Location: Anchorage, AK Vehicle: 2006 Impreza WRX LTD Cloaking Device Gray	read this. http://en.wikipedia.org/wiki/Limited_slip_differential

07-04-2007, 12:38 AM	#4
Firestrike * Banned * Member#: 135785 Join Date: Dec 2006 Chapter/Region: AKIC Location: Anchorage, AK Vehicle: 2006 Impreza WRX LTD Cloaking Device Gray	Well John, from what I read here: The use of the word mechanical implies that the limited slip differential is engaged by interaction between two (or more) mechanical parts. This category includes clutch and helical limited slip differentials. For road racing, many prefer a helical limited slip differential, because it does not lock the two output shafts to spin at the same rate, but rather biases torque to the wheel with more grip by up to 80% Helical and mechanical are part of the same type.

07-04-2007, 12:39 AM	#5
Firestrike * Banned * Member#: 135785 Join Date: Dec 2006 Chapter/Region: AKIC Location: Anchorage, AK Vehicle: 2006 Impreza WRX LTD Cloaking Device Gray	If you are looking for a diff that is different, it would be this: Viscous The viscous type is generally simpler, and relies on the properties of a dilatant fluid - that is, one which thickens when subject to shear. Silicone-based oils are often used. Here, a cylindrical chamber of fluid filled with a stack of perforated discs rotates with the normal motion of the output shafts. The inside surface of the chamber is coupled to one of the driveshafts, and the outside coupled to the differential carrier. Half of the discs are connected to the inner, the other half to the outer, they alternate inner/outer in the stack. Differential motion forces the interlocked (though untouching) discs to move through the fluid against each other.

07-04-2007, 12:40 AM	#6
RawCode Scooby Specialist Member#: 3115 Join Date: Dec 2000 Chapter/Region: AKIC Location: Anchorage,AK USA Vehicle: 2002 Impreza 2.5RS Silver	IIRC helical is a mechanical differential. edit: I am too slow! Maybe he is better off reading this: http://auto.howstuffworks.com/differential.htm

07-04-2007, 12:44 AM	#8
RawCode Scooby Specialist Member#: 3115 Join Date: Dec 2000 Chapter/Region: AKIC Location: Anchorage,AK USA Vehicle: 2002 Impreza 2.5RS Silver	here is a thread in the driveline forum FAQ too: http://forums.nasioc.com/forums/showthread.php?t=423584

07-04-2007, 12:52 AM	#9
soldmyboxster Scooby Specialist Member#: 65520 Join Date: Jul 2004 Chapter/Region: International Location: teh UK Vehicle: '11 M3 Coupe	I recall reading in SCC a long time ago that the fluid in a viscous differential could also be described as thixotropic. I believe it's a synonym for dilatant. No, I'm not going to bother looking it up. As for which is better, I've driven a Quaife ATB diff (all gears, no clutches) and a Honda OEM clutch-type diff in very similar cars (1988 CRXs) and I strongly prefer the clutch-type. The Quaife caused serious understeer under throttle. The clutch type was a little more forgiving.

07-04-2007, 12:55 AM	#10
RawCode Scooby Specialist Member#: 3115 Join Date: Dec 2000 Chapter/Region: AKIC Location: Anchorage,AK USA Vehicle: 2002 Impreza 2.5RS Silver	NASIOC diff FAQ http://forums.nasioc.com/forums/show...sti+front+diff

07-04-2007, 01:01 AM	#11
Firestrike * Banned * Member#: 135785 Join Date: Dec 2006 Chapter/Region: AKIC Location: Anchorage, AK Vehicle: 2006 Impreza WRX LTD Cloaking Device Gray	Haha John. Any more questions? I say this will teach you what you need to know. And how to use the search function maybe? lol

07-08-2007, 12:41 AM	#12
shortfuseWRX Scooby Specialist Member#: 38573 Join Date: Jun 2003 Location: Anchorage, AK Vehicle: 1997 toyota tacoma Black death	do a spool john!!!! sam