Lsd ?
Joined: May 2005
Posts: 1,256
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From: heart of 626 bad drivers
Lsd ?
Alright guys, I got a question thats been bothering me. My girlfriends house has this steep and I mean steep driveway. I had lowered cars previous and with my g it's not hard to get onto but, I noticed when I go in sideways/slanted, sometimes. . .
1) I let go of the clutch slowly so I can just ease in there.
2) if that doesn't work I gas it a little bit.
If step one doesnt work I go for 2, and lately it's been giving me a weird sound, like something locking up or something, it's too hard for me to explain. That is why I was wondering if it was my lsd, and what kind of lsd does our g's have. I've tried the search button, and maybe I just suck at searching but I can't find anything. Also can someone explain to me how our lsd works and all that good stuff, and try to assume what my problem could be. Thanks!
1) I let go of the clutch slowly so I can just ease in there.
2) if that doesn't work I gas it a little bit.
If step one doesnt work I go for 2, and lately it's been giving me a weird sound, like something locking up or something, it's too hard for me to explain. That is why I was wondering if it was my lsd, and what kind of lsd does our g's have. I've tried the search button, and maybe I just suck at searching but I can't find anything. Also can someone explain to me how our lsd works and all that good stuff, and try to assume what my problem could be. Thanks!
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Joined: Nov 2004
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From: Trolling a forum near u.... (T.O.)
Noise is not related to oem VLSD operation, most likely your hearing the suspension bushings deflecting to adapt to the extreamly steep driveway. Either that or your hearing the unibody flex.
To explain how VLSD works you need to read the following, originally posted by Qtech45.
Q45tech (Registered)
07/18/04 04:24 PM
http://www.a1.nl/phomepag/markerink/viscolok.htm
GKN Visco Lok/Visco Drive system description.
UK company bought control from Nissan and now supplies BMW/Jag etc VLSD
Hitachi/Tochigi Fuji Sangyo
"Viscous LSD units are popular OEM LSD solutions, as they are relatively simple and cheap to produce. They come in many performance Subarus, Nissans, Mazdas, Toyotas, etc. The LSD unit consists of stacks of thin plates with holes or slots, all suspended in a special silicone fluid. They have no clutches to wear out, and locking characteristics can theoretically be changed by varying fluid viscosity. Generally, however, these units are non-serviceable, and require no special maintenance. As the differential spins, the plates shear the fluid up to a point, after which the fluid provides some resistance to shear, allowing 15-25% torque transfer to the other wheel. The downside is that these units don't act like a limited slip until one wheel actually starts slipping (i.e., they don't prevent slippage), which means the VLSD action often kicks in after you've already exited the corner. Compared to the proactive nature of the Torsen LSDs, the VLSDs are reactive units. They do not prevent slippage, they merely sense differences in rotation, not torque. They also don't allow for very much torque transfer, compared to mechanical or clutch-pack LSDs. They do still work well for starting from a dead stop in slippery conditions. It is important to note that VLSDs locking characteristics occur both during acceleration AND braking, as it can't tell the difference between the two, but merely reacts to the rotational speed differences between the two drive wheels. "
To explain how VLSD works you need to read the following, originally posted by Qtech45.
Q45tech (Registered)
07/18/04 04:24 PM
http://www.a1.nl/phomepag/markerink/viscolok.htm
GKN Visco Lok/Visco Drive system description.
UK company bought control from Nissan and now supplies BMW/Jag etc VLSD
Hitachi/Tochigi Fuji Sangyo
"Viscous LSD units are popular OEM LSD solutions, as they are relatively simple and cheap to produce. They come in many performance Subarus, Nissans, Mazdas, Toyotas, etc. The LSD unit consists of stacks of thin plates with holes or slots, all suspended in a special silicone fluid. They have no clutches to wear out, and locking characteristics can theoretically be changed by varying fluid viscosity. Generally, however, these units are non-serviceable, and require no special maintenance. As the differential spins, the plates shear the fluid up to a point, after which the fluid provides some resistance to shear, allowing 15-25% torque transfer to the other wheel. The downside is that these units don't act like a limited slip until one wheel actually starts slipping (i.e., they don't prevent slippage), which means the VLSD action often kicks in after you've already exited the corner. Compared to the proactive nature of the Torsen LSDs, the VLSDs are reactive units. They do not prevent slippage, they merely sense differences in rotation, not torque. They also don't allow for very much torque transfer, compared to mechanical or clutch-pack LSDs. They do still work well for starting from a dead stop in slippery conditions. It is important to note that VLSDs locking characteristics occur both during acceleration AND braking, as it can't tell the difference between the two, but merely reacts to the rotational speed differences between the two drive wheels. "
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