Scion's Explanation of BRZ FR-S Limited Slip Differential - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

stalon320 · 06-20-2012, 10:21 PM

I thought I would post this. Kind of a no brainer.. but i thought it was kinda cool..Click on the link to view

http://www.ft86club.com/forums/showthread.php?t=9288

arghx7 · 06-20-2012, 10:35 PM

Yes, a Torsen differential uses gears inside to transfer torque. It's a proven 20+ year old design. There aren't clutches inside causing the two wheels to lock up. Nor is there a viscous coupling to adjust transfer between wheels based on a speed difference.

these are still dumb mechanical differentials. The are subject to whatever compromises were made in the mechical design of the gears. A computer controlled torque vectoring differential like you find on higher end drivetrains (Evo X for example, or BMW M cars) are not subject to a fixed bias ratio curve.

ThatGuy · 06-22-2012, 03:12 AM

Well yeah I guess they' "dumb" in that they have no thinking at all to do. Instead they just work with virtually no reaction time at all. Which is great. The torsion LSD is the best type for road cars. I definitely wouldn't prefer a "thinking" electronic LSD since it's against the ENTIRE POINT OF THE CAR.

OrbitalEllipses · 06-22-2012, 06:39 AM

Quote:

Originally Posted by ThatGuy

Well yeah I guess they' "dumb" in that they have no thinking at all to do. Instead they just work with virtually no reaction time at all. Which is great. The torsion LSD is the best type for road cars. I definitely wouldn't prefer a "thinking" electronic LSD since it's against the ENTIRE POINT OF THE CAR.

Now, there are some parts of the car that should remain purely mechanical, I agree with you. Saying a Torsen LSD is the BEST for road cars; however, is ignorant. I'd love me some torque vectoring as found on the Evolution!

Mitch · 06-22-2012, 09:25 AM

Torque vectoring differentials are impressive, but I'm glad I didn't have to pay for one.

industrial · 06-22-2012, 11:26 AM

Yeah the evo has some awesome computers to make the car go fast in just about any condition. I probably won't miss those much since if I am doing a track day, I'm just going to turn everything off and try to be a better driver. The fancy diffs would be nice on the road but I don't think they'd be worth the price.

06-20-2012, 10:21 PM	#1
stalon320 Senior Member Join Date: Jun 2012 Drives: Scion FR-S coming 2013! Location: New Windsor, NY Posts: 179 Thanks: 164 Thanked 30 Times in 23 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Scion's Explanation of BRZ FR-S Limited Slip Differential I thought I would post this. Kind of a no brainer.. but i thought it was kinda cool..Click on the link to view http://www.ft86club.com/forums/showthread.php?t=9288 __________________ To Strive, To Seek , To Find.. and not to Yield- Tennyson Countdown to Spring 2013- FR-S A/T in either Argento or Raven

06-20-2012, 10:35 PM	#2
arghx7 Senior Member Join Date: Nov 2011 Drives: car Location: cold Posts: 599 Thanks: 72 Thanked 607 Times in 185 Posts Mentioned: 33 Post(s) Tagged: 0 Thread(s)	Yes, a Torsen differential uses gears inside to transfer torque. It's a proven 20+ year old design. There aren't clutches inside causing the two wheels to lock up. Nor is there a viscous coupling to adjust transfer between wheels based on a speed difference. these are still dumb mechanical differentials. The are subject to whatever compromises were made in the mechical design of the gears. A computer controlled torque vectoring differential like you find on higher end drivetrains (Evo X for example, or BMW M cars) are not subject to a fixed bias ratio curve. Attached Images

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06-22-2012, 03:12 AM	#3
ThatGuy Member Join Date: Jun 2012 Drives: R33 GTST - slightly modified. Location: Brisbane, Australia Posts: 10 Thanks: 0 Thanked 3 Times in 3 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Well yeah I guess they' "dumb" in that they have no thinking at all to do. Instead they just work with virtually no reaction time at all. Which is great. The torsion LSD is the best type for road cars. I definitely wouldn't prefer a "thinking" electronic LSD since it's against the ENTIRE POINT OF THE CAR.

06-22-2012, 09:25 AM	#5
Mitch form follows function Join Date: Nov 2011 Drives: RIP '13 BRZ Location: Baton Rouge Posts: 688 Thanks: 42 Thanked 234 Times in 122 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	Torque vectoring differentials are impressive, but I'm glad I didn't have to pay for one.

06-22-2012, 11:26 AM	#6
industrial Add lightness! Join Date: Apr 2012 Drives: 17' WRX Location: Boston Posts: 1,253 Thanks: 380 Thanked 888 Times in 411 Posts Mentioned: 20 Post(s) Tagged: 0 Thread(s)	Yeah the evo has some awesome computers to make the car go fast in just about any condition. I probably won't miss those much since if I am doing a track day, I'm just going to turn everything off and try to be a better driver. The fancy diffs would be nice on the road but I don't think they'd be worth the price.

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