zgeezer Posted November 3, 2003 Share Posted November 3, 2003 Search as I might, I can't find the answer to the following question. What procedure do you use to field test in the jy for a viscuous LSD? I understand the visual test of looking for a yellow tag or finned inspection plate. I've identified clutch LSD by securing the drive shaft and then attempt to turn a wheel. If the other rotates backward it's open. If it doesn't move easily, its toast or LSD. But, I understand viscuous LSD all slip easily by hand because they "engage" in the same manner that a torque converter "engages" ,by hydraulic action where one slipping axle will transmit torque to the other. Any help out there or do I just read every tag or dismantle every differential? g Quote Link to comment Share on other sites More sharing options...
johnc Posted November 3, 2003 Share Posted November 3, 2003 Take the cover off and look inside. Quote Link to comment Share on other sites More sharing options...
Dp351zcar Posted November 4, 2003 Share Posted November 4, 2003 This is my test results on a couple viscous lsd's that I found. I could twist the side shafts with difficulty on a vlsd, on a open it spins easy. Don Quote Link to comment Share on other sites More sharing options...
peej410 Posted November 15, 2003 Share Posted November 15, 2003 in a viscous lsd spinning one side of the diff should make the other side spin in the same direction or not at all in an open diff the other side will spin in the opposite direction, at least this is how my infinity VLSD tranny works that i put in my maxima Quote Link to comment Share on other sites More sharing options...
denny411 Posted November 15, 2003 Share Posted November 15, 2003 On my q45 vlsd, both wheels turn in the same direction. Quote Link to comment Share on other sites More sharing options...
Guest Cusp Posted November 15, 2003 Share Posted November 15, 2003 One thing to keep in mind is that a siezed brake can keep axles from moving, which may make one type of diff seem like another. That said... On a viscous with ALL 3 output shafts disconnected (unhindered), turning the driveshaft end moves both side outputs together (of course). Turning one side moves the other side in the opposite direction and doesn't move the driveshaft end. This motion should be smooth and easy to turn. Turning both sides together (same direction) spins the driveshaft quickly (at whatever your gear ratio is, relative to what you rotate the sides at). This should be a bit harder to turn, (due to your rotating every moving part in the pumpkin) but should not be rough. Think high gear on a mountain bike. I only trust testing a viscous diff fully detatched from the driveline. It can be in the car, just undo the axles and driveshaft ( I know, not the funnest thing to do). I prefer this method because it eliminates any roughness or siezing due to external sources, i.e. bad brakes, bad tranny, etc. This is especially true with viscous, where turning say, a tire on one end may require such force due to some degree of rust or whatever, that the driveline may act open. You could walk away from a good VLSD simply because a rusty brake held the left wheel still while you spun the right, whereas you may be strong enough to turn the left still. Hope this helps. Quote Link to comment Share on other sites More sharing options...
peej410 Posted November 15, 2003 Share Posted November 15, 2003 very good point, im just getting my sbc running right and ive got the stock r180 so ill be upgrading soon, too bad CT doesnt have any pick and pulls Quote Link to comment Share on other sites More sharing options...
Dp351zcar Posted November 16, 2003 Share Posted November 16, 2003 Ok so what I forgot to say is the two diffs I looked at were out of the car. I could turn the side shafts in opposite directions, it was smooth but it was hard to do. Don Quote Link to comment Share on other sites More sharing options...
Dp351zcar Posted November 16, 2003 Share Posted November 16, 2003 What I want to know is what is it like driving a clutch LSD compared to driving a VLSD. My thoughts are the VLSD would be smother and more forgiving in the rain but would it take to long to "heat up" lockup lets say in a autox? I have both units and plan to try them both. That is if I ever get my car done. Don Quote Link to comment Share on other sites More sharing options...
peej410 Posted November 16, 2003 Share Posted November 16, 2003 the vlsd in my maxima seems seemless, if you could explain it as such. the first time i ripped it sideways through a corner it nearly ripped the wheel outta my hands since then it seems like it is just there, no one wheel peel ever but after 30k i still cannot feel it engage, my only problem now is that i want that seemless feeling in my z. if this doesnt make sense my appologies i just got home from a party and i am drunk as a skunk Quote Link to comment Share on other sites More sharing options...
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