brianZortiz Posted May 28, 2012 Share Posted May 28, 2012 I have a 3.9 LSD with extra clutches. It works really well and my handling improved over open diff(s). I went to a 7/11 and the driveway was really steep. My car is lowered so I approached the driveway slowly and right rear tire was in the air while all weight shifted to left rear of car making the rear fender lock up with the tire. I got stuck with only right rear spinning as left was locked from fender/tire. I spun it for like 2-3 seconds and pushed it back into the street. I was wOndering if an LSD diff can act like this on a situation like this one. I hope I didn't mess my diff up, but when I drove away, nothing seemed wrong. Quote Link to comment Share on other sites More sharing options...
Administrators RTz Posted May 28, 2012 Administrators Share Posted May 28, 2012 That is not abnormal. With one tire in the air, the only thing loading the clutches is whatever pre-load there happens to be and that's not normally enough. Once both tires have some grip, the side gears have something to work against and can load the clutches up MUCH more. Quote Link to comment Share on other sites More sharing options...
BluDestiny Posted May 28, 2012 Share Posted May 28, 2012 Lol that's why it's called a Limited slip dif. Quote Link to comment Share on other sites More sharing options...
dexter72 Posted May 28, 2012 Share Posted May 28, 2012 Where you 4 wheeling or getting a soda, Make up your mind. It should be fine Quote Link to comment Share on other sites More sharing options...
johnc Posted May 28, 2012 Share Posted May 28, 2012 Its called breakaway torque. When you lock one wheel the LSD will let the other spin when the set breakaway torque is reached in the diff. That's the "Slip" part of a LSD. Quote Link to comment Share on other sites More sharing options...
brianZortiz Posted May 28, 2012 Author Share Posted May 28, 2012 Wow, learned something today. Thanks guys! @dexter72 it was a slurpee and a bag of chips, but sure the hell did feel like I was 4 wheeling. Quote Link to comment Share on other sites More sharing options...
RebekahsZ Posted May 29, 2012 Share Posted May 29, 2012 If the tire had not gotten locked in the fender, would the car have climbed the driveway in spite of having one tire in the air? Quote Link to comment Share on other sites More sharing options...
brianZortiz Posted May 29, 2012 Author Share Posted May 29, 2012 Question for me or the diff knowledge people? Quote Link to comment Share on other sites More sharing options...
JMortensen Posted May 29, 2012 Share Posted May 29, 2012 One tire in the air = no drive on an LSD, unless it's shimmed super tight. You could have applied some brake and that would have allowed you to move. Quote Link to comment Share on other sites More sharing options...
RebekahsZ Posted May 30, 2012 Share Posted May 30, 2012 Great question. I always hope for answers from people with knowledge. I recognize, however, that I often ask stupid questions. So, mechanically, application of power against the resistance of the brakes forces the LSD up the internal ramps and gives the driver more locking than merely breakaway torque? Quote Link to comment Share on other sites More sharing options...
JMortensen Posted May 31, 2012 Share Posted May 31, 2012 Exactly. Preload is just that. But our limited slips are torque sensitive, and they can lock up quite a bit harder than the preload. They need some traction to do it though, and stepping on the brake simulates traction and gives the LSD something to work against. Quote Link to comment Share on other sites More sharing options...
RebekahsZ Posted June 1, 2012 Share Posted June 1, 2012 I love HybridZ! Group hug.... Quote Link to comment Share on other sites More sharing options...
johnc Posted June 1, 2012 Share Posted June 1, 2012 Shtop! Starker! This HybridZ! Ve don't group hug here. Quote Link to comment Share on other sites More sharing options...
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