camber Posted May 27, 2009 Share Posted May 27, 2009 (edited) must be just for that year then cause i had a 02 BE and it had a open rear. Was your car a GT? Only the GT versions got the LSD. Of course it could be a Canadian thing. Edited May 28, 2009 by camber Link to comment Share on other sites More sharing options...
whitetiger Posted May 28, 2009 Author Share Posted May 28, 2009 yes it was a GT. YOu are prolly right about the canada thing. Im pretty sure that no USDM legacy 2000-2004 got a LSD in the rear. Link to comment Share on other sites More sharing options...
Spec B Posted August 23, 2009 Share Posted August 23, 2009 (edited) Bumping this up so I did not have to start a new thread..and sorry for the long post. Today I was parked on an up-hill, ground was completely dry. Passenger front tire is on the edge of the curb almost on the pavement and rear passenger tire are on the sidewalk (very low curb), driver side tires are on the pavement. I turn the steering wheel almost full lock left to pull out of the parking spot and i ease into first gear. The passenger side front wheel spins and I go no where, actually I rolled backwards with a spinning front passenger side tire. Okay...so I try again, same result. I get out expecting to find oil or some other slick stuff on the ground or on the tire...there was nothing. Dry ground dry tire.. I am starting to panic now. So I decide to try to straighten out the wheel (instead of almost full lock) and same result. I let the car roll back straightened out the wheels and tried again and all was normal again. After that episode I tried launching the car semi-hard to see if I spin that front right wheel and not the others. To my surprise car grabbed and took off in full awd fashion. What the hell happened?! Is this the open front diff at play? Edited August 23, 2009 by Spec B Link to comment Share on other sites More sharing options...
Spec B Posted August 23, 2009 Share Posted August 23, 2009 anyone? Link to comment Share on other sites More sharing options...
NSFW Posted August 23, 2009 Share Posted August 23, 2009 Open front diff gets my vote. You might think that the viscous coupling in the center would bind up and therefore save the day, but those things don't really bind up nearly as hard as we'd all like them to. Link to comment Share on other sites More sharing options...
Spec B Posted August 24, 2009 Share Posted August 24, 2009 Pretty sad I think. First time anything like that has happened to me in any car (fwd, rwd or awd). Link to comment Share on other sites More sharing options...
fishbone Posted August 24, 2009 Share Posted August 24, 2009 5EAT LGT traction split is 44.3% front, 55.7% rear under normal driving condition. Upon hard acceleration, stop or slip, traction split is sent front or rear as needed. Link to comment Share on other sites More sharing options...
Gator GT Posted August 24, 2009 Share Posted August 24, 2009 Very good whitetiger! I'm one of those who really didn't "need" the front helical LSD, but went for it anyway (couldn't pass up the deal I found at RalliSpec). NO REGRETS on the LSD!!! I love the low maintenance and seamless characteristics of the helical unit. And having stepped up to 225 PS2's, it shines through that much more. ....now I just need to wait for this flippin' humidity to pass through so my stage2 can let me push it that much more. Thanks again whitetiger! "If we are to guard against ignorance and remain free, it is the responsibility of every American to be informed." - T. Jefferson Link to comment Share on other sites More sharing options...
whitetiger Posted August 24, 2009 Author Share Posted August 24, 2009 Pretty sad I think. First time anything like that has happened to me in any car (fwd, rwd or awd). its a combination of both the center viscous and front diffs failing. if one fo the front wheels has no traction, then its like one end of the center diff not having traction. the viscous unit cant transfer all the torque to the rear. so the rear wheels did not get enough power to move the car up the hill. a front LSD would prevent situations like this from happening. Link to comment Share on other sites More sharing options...
Spec B Posted August 24, 2009 Share Posted August 24, 2009 ^ Interesting..front LSD ftw. Link to comment Share on other sites More sharing options...
Guest Posted August 24, 2009 Share Posted August 24, 2009 Indeed. Front LSD FTW. I just replaced SpecB tranny with a STI tranny with DCCD. Haven't hooked up DCCD controller yet, but a review will follow.... breakin in engine now (yet again ). Link to comment Share on other sites More sharing options...
f1anatic Posted April 3, 2010 Share Posted April 3, 2010 would want to keep your final drive. it has to match your front diff anyways. if you want a helical rear LSD , then you will just buy the carrier unit and swap you stock ring and pinion on to it. http://legacygt.com/forums/showpost.php?p=2884612&postcount=4 Link to comment Share on other sites More sharing options...
whitetiger Posted April 22, 2010 Author Share Posted April 22, 2010 just to add to this thread...ClimberD is in the process of test fitting a 5MT Diff to the 5eat trans. if successful, it will open doors for you 5eat folk to get more traction up front. http://legacygt.com/forums/showthread.php/5eat-front-lsd-fitment-test-134603.html Link to comment Share on other sites More sharing options...
svx6 Posted January 11, 2011 Share Posted January 11, 2011 This should be stickied... Link to comment Share on other sites More sharing options...
Underdog Posted September 13, 2012 Share Posted September 13, 2012 After a fair amount of searching I was able to find some real literature on the AP Racing Suretrac differential, which I just bought off Whitetiger. It is an interesting design for sure, and I've attached some images that I plucked from the mycaterham.com website to show off the cool internal geometry of the face cams and followers. From reading the literature it does seem to me that this will act as an open differential when one wheel is in a near-zero traction condition (lifts a wheel or on glare ice) and during turns where there is little input torque. However, in power-on turns, the torque going into the differential will 'preferentially' go to the wheel that is slower (more grip) and act as a brake to the wheel that is slipping. The amount of torque transfer is a function of the friction between the cam and followers, which is directly proportional to the input torque. This means that the differential responds to how much torque you are sending through it, and not the speed differential between the left and right wheels (like the OEM viscous unit does). Pretty cool stuff. Oh, and why hasn't this been stickied yet? The Crimson Dynamo Link to comment Share on other sites More sharing options...
NSFW Posted September 14, 2012 Share Posted September 14, 2012 Interesting stuff, thanks for posting that. Link to comment Share on other sites More sharing options...
Underdog Posted September 14, 2012 Share Posted September 14, 2012 I've been trying to picture how the non-equal number of 'teeth' on the left and right face cams is critical to the operation of the diff, as noted on p.2 of the literature: The number of teeth of the left and right face cams differs by one tooth. The reason for this is that, in order for the cam followers to transmit drive force to the face cams, the left and right face cams have to form wedge shapes, as shown in Figure 3. If the number of teeth were the same, all the hills and valleys of the teeth might in some cases arrange themselves opposite each other. The prerequisite wedge shape then would not be obtained, and the cam followers would slip down the helical surface of the face cams, zigzagging between the left and right face cams and making it impossible for drive force to be transmitted (see Figure 4). For this reason, the right face cam has 10 teeth and the left face cam has 9 teeth. If the number and angle of the teeth were the same, the force transmitted to the left and right sides would be the same and there would be no difference in rotational speed between the left and right sides. A slight difference between the left and right sides is created, therefore, by having a one-tooth difference on one side. Since this difference is slight and does not exert a marked effect, however, the torque transmitted to the left and right face cams is herein treated as equal for the sake of clarity. But when I view the pictures of the torn-down diff on mycaterham.com, we clearly see six teeth on both cams... http://www.mycaterham.com/mediac/400_0/media/DIR_39305/DIR_119216/oops.jpg The Crimson Dynamo Link to comment Share on other sites More sharing options...
whitetiger Posted September 14, 2012 Author Share Posted September 14, 2012 the suretrac is magic. you just have to believe it works, and it will. Link to comment Share on other sites More sharing options...
Underdog Posted September 14, 2012 Share Posted September 14, 2012 I am willing to believe! BTW, you have me trying to figure out the logistics of doing a JDM helical FLSD in the very near future... The Crimson Dynamo Link to comment Share on other sites More sharing options...
mr.hicksta Posted September 17, 2012 Share Posted September 17, 2012 Stickied Link to comment Share on other sites More sharing options...
dug-e-fresh Posted January 21, 2014 Share Posted January 21, 2014 thoughts on installing a RA Spec C Suretrac front diff into the Legacy SpecB 6 speed? thx Link to comment Share on other sites More sharing options...
dug-e-fresh Posted January 31, 2014 Share Posted January 31, 2014 anyone? Link to comment Share on other sites More sharing options...
whitetiger Posted February 4, 2014 Author Share Posted February 4, 2014 it would be ok, as long as the diff is meant for the 6speed. It would be better if you were to find a 05+ OEM USDM sti diff as they are a helical unit and generally operate faster and more predictably than the suretrac. but if you can get that suretrac on the cheap, go for it. the 04 USDM STI came with a front suretac but it was changed in later years to the helical for the reasons stated above. Link to comment Share on other sites More sharing options...
dug-e-fresh Posted February 4, 2014 Share Posted February 4, 2014 $285 shipped with 12k miles... how's that sound? Link to comment Share on other sites More sharing options...
whitetiger Posted February 5, 2014 Author Share Posted February 5, 2014 sounds good. enjoy! Link to comment Share on other sites More sharing options...
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