Guest MrBlonde Posted March 26, 2005 Share Posted March 26, 2005 i have an 88 turbo. i need to know if i have an lsd. its a z31. help please Quote Link to comment Share on other sites More sharing options...
RB26powered74zcar Posted March 26, 2005 Share Posted March 26, 2005 If no one has ever changed the diff in it, I would say yes, you have a LSD in her. The fastest way for you to check it is, jack up the rear (both rear wheels) and spin a wheel. If they both spin the same direction, you gotta LSD. If one does not spin, or if one turns the oppisite way, you have a open diff.. Quote Link to comment Share on other sites More sharing options...
datsunlover Posted March 26, 2005 Share Posted March 26, 2005 Yah but dont some 'LSD' diffs still spin one wheel the other way doing this test? I had an 85 200sx with lsd, and if I jacked up the rear end and spun a tire, the oposite tire would go the other way. BUT; I did some ah... testing in parking lots and dirt roads and found that one wheel would spin for a moment and THEN the other would kick in. IE; One burn out mark would start, and about 2 feet away the other would spin... Two black marks, but one was always longer. It was interasting when making sharp turns at intersections as it would act like an 'open' diff (spinning the rear out, typical throttle overstear) and suddenly 'kick' and go straight. In winter or heavy rain, it would actually push the front tires (understear) sometimes.. Quote Link to comment Share on other sites More sharing options...
DaleMX Posted March 26, 2005 Share Posted March 26, 2005 Jeromio's site has a doc on there with the LSD years in it. Hey, if you have a white 88 you might have something special on your hands. http://240z.jeromio.com/faqdraft/ Quote Link to comment Share on other sites More sharing options...
Dp351zcar Posted March 26, 2005 Share Posted March 26, 2005 Datsunlover it sounds like you might have a viscous LDS in there and not a clutch unit. Don Quote Link to comment Share on other sites More sharing options...
zguy95135 Posted March 27, 2005 Share Posted March 27, 2005 Has anyone used a Phantom Grip? In Sport Compact Car they used it in one of their project cars. Quote Link to comment Share on other sites More sharing options...
ww Posted March 27, 2005 Share Posted March 27, 2005 Has anyone used a Phantom Grip? In Sport Compact Car they used it in one of their project cars. The Phantom Grip is complete crap and for $300 it's an expensive piece of crap. For $250 more you can get a Precision Gear Power Brute from Reider Racing and have a real LSD. Quote Link to comment Share on other sites More sharing options...
Deep Posted March 28, 2005 Share Posted March 28, 2005 Yah but dont some 'LSD' diffs still spin one wheel the other way doing this test? I had an 85 200sx with lsd, and if I jacked up the rear end and spun a tire, the oposite tire would go the other way. BUT; I did some ah... testing in parking lots and dirt roads and found that one wheel would spin for a moment and THEN the other would kick in. IE; One burn out mark would start, and about 2 feet away the other would spin... Two black marks, but one was always longer. It was interasting when making sharp turns at intersections as it would act like an 'open' diff (spinning the rear out, typical throttle overstear) and suddenly 'kick' and go straight. In winter or heavy rain, it would actually push the front tires (understear) sometimes.. That would be a Viscous LSD or VLSD. Quote Link to comment Share on other sites More sharing options...
datsunlover Posted March 28, 2005 Share Posted March 28, 2005 That would be a Viscous LSD or VLSD. Right.. now, did some 300zxs come with that one, or were all the first gens (that came with LSD's) the clutch type? Quote Link to comment Share on other sites More sharing options...
Guest bastaad525 Posted March 28, 2005 Share Posted March 28, 2005 Yah but dont some 'LSD' diffs still spin one wheel the other way doing this test? I had an 85 200sx with lsd, and if I jacked up the rear end and spun a tire, the oposite tire would go the other way. BUT; I did some ah... testing in parking lots and dirt roads and found that one wheel would spin for a moment and THEN the other would kick in. IE; One burn out mark would start, and about 2 feet away the other would spin... Two black marks, but one was always longer. It was interasting when making sharp turns at intersections as it would act like an 'open' diff (spinning the rear out, typical throttle overstear) and suddenly 'kick' and go straight. In winter or heavy rain, it would actually push the front tires (understear) sometimes.. That sounds like a pretty worn out viscous unit if I"m not mistaken... the snot fluid in there that actually provides the limited slip action is all worn out and takes longer to expand and grip. Quote Link to comment Share on other sites More sharing options...
evildky Posted March 28, 2005 Share Posted March 28, 2005 I am using the viscous, and if I jack up my car and spin one wheel with the car in neutral the other spins the same direction, if I oput the car in gear and spin one wheel it takes a lot more work and the other wheel goes backwards, and the Z31 only got viscour on the 88SS (aka: 88SE, Shiro, White) they were all white, with white wheels and recaro seats, and they didn't make many of them Quote Link to comment Share on other sites More sharing options...
Guest MrBlonde Posted March 28, 2005 Share Posted March 28, 2005 Jeromio's site has a doc on there with the LSD years in it. Hey' date=' if you have a white 88 you might have something special on your hands. http://240z.jeromio.com/faqdraft/ I know what I have. Yeah, it's an 88 white with white rims. The SS edition. How many of them were there made? And what are the differences from the normal turbo 300z? Quote Link to comment Share on other sites More sharing options...
Guest MrBlonde Posted March 28, 2005 Share Posted March 28, 2005 So, is vlsd better or worse? what's the difference? Quote Link to comment Share on other sites More sharing options...
JMortensen Posted March 28, 2005 Share Posted March 28, 2005 VLSD doesn't actively reduce tire spin. It doesn't do anything to prevent tire spin until one side starts spinning. When one side spins it creates hydraulic pressure that drives the other side. CLSD uses the torque on the driveline to compress a clutch stack to drive both wheels. More torque = more lockup. The clutch type is preferred in autoxing and road racing over the VLSD, but lately I've been getting the impression that the VLSD is preferred for huge amounts of torque in a drag car. Probably less shock to the driveline since there is a fluid coupling there rather than a clutch stack. This site has a thorough explanation of them all: http://auto.howstuffworks.com/differential.htm Quote Link to comment Share on other sites More sharing options...
DaleMX Posted March 28, 2005 Share Posted March 28, 2005 Here's a link, but who really knows for sure. http://zhome.com/History/SSZ.htm Quote Link to comment Share on other sites More sharing options...
Guest MrBlonde Posted March 29, 2005 Share Posted March 29, 2005 The differentials are swappable though, right? I don't think I'm going to keep this VLSD, because my primary interest is autox and gymkhana drifting. how much work would be involved in swapping in a CLSD? Quote Link to comment Share on other sites More sharing options...
JMortensen Posted March 29, 2005 Share Posted March 29, 2005 Well you might want to try it before you just take it out. You can also change to a thicker fluid which makes it more aggressive. Swapping should be no big deal as long as the CV bolt pattern is the same on the outside end of the CV. Just get a new diff and CV's from a 87-89 and pop it in. Swapping the LSD out of that housing is a little different and you'll want to avoid doing that if you can. It can be done, but the CV's don't work and there might be issues with the ring gear bolts being too large. I want to say the VLSD has 13mm bolts which means you'd have to redo the holes in the carrier or swap the ring and pinion, at which point you'd probably be better off getting the CLSD diff and CV's in the first place. Quote Link to comment Share on other sites More sharing options...
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