168mm LSD specific thread as most data is related to 188mm units.
168mm is commonly USA found in 4 cylinder e30's
168mm is non usa in some 6 cylinder e30's
168mm is also interchange with older cars; e21/2002. Somewhat - More on the Old Old school later.
E30 168mm setup:
2 clutch discs total (1 per side)
2 steels total (1 per side)
Older 168mm LSD cars had factory 4 discs setups; perhaps someone with a rare setup in 2002 or e21 can chime in.
168mm is commonly avail in these ratios stateside:
3,45 (318ti e46)
3,64 (some e21)
3,91 (318i M10 e30)
4,27 (318i m42 vert)
4,45 (318i e36)
some weird others must exist as well as LOW ratio 3,25 from euro e30 323i; the lower ratio 3,25 final drive has a special LSD capsule with different offset geometry not compatible with the others.
Bolts are also M12 size instead of M10.
LOW ratio Euro on left from early e30
LOW ratio on right with split bell type ring gear flange
For Internals of the 168mm there are 2 standards for clutch discs and steel discs; the center ramps are also different heights.
Older style clutch disc (e21/2002) has different spline standard than Modern E30/e36 style
Modern E30, E36 spider gears also are a different profile than the older units.
168mm e30/e36 LSD spider gears are only toothed very narrow; only 1 clutch disc will fit on these teeth. (1 clutch disc per side).
This limits lockup to 25% locking in modern e30/e36 LSD 168mm.
The rosetta stone early e30 LOW ratio unit happens to have the Vintage style long teeth spiders so that with machine work+custom internals a 3x or 4x clutch setup could be installed.
The older (e21/2002) units internally have longer spline teeth similar to a 188mm unit; those internal setups can be interchanged with custom internals into a newer e30 case capsule if desired; machine work and custom ground thicknesses of internals will be required.
168mm is commonly USA found in 4 cylinder e30's
168mm is non usa in some 6 cylinder e30's
168mm is also interchange with older cars; e21/2002. Somewhat - More on the Old Old school later.
E30 168mm setup:
2 clutch discs total (1 per side)
2 steels total (1 per side)
Older 168mm LSD cars had factory 4 discs setups; perhaps someone with a rare setup in 2002 or e21 can chime in.
168mm is commonly avail in these ratios stateside:
3,45 (318ti e46)
3,64 (some e21)
3,91 (318i M10 e30)
4,27 (318i m42 vert)
4,45 (318i e36)
some weird others must exist as well as LOW ratio 3,25 from euro e30 323i; the lower ratio 3,25 final drive has a special LSD capsule with different offset geometry not compatible with the others.
Bolts are also M12 size instead of M10.
LOW ratio Euro on left from early e30
LOW ratio on right with split bell type ring gear flange
For Internals of the 168mm there are 2 standards for clutch discs and steel discs; the center ramps are also different heights.
Older style clutch disc (e21/2002) has different spline standard than Modern E30/e36 style
Modern E30, E36 spider gears also are a different profile than the older units.
168mm e30/e36 LSD spider gears are only toothed very narrow; only 1 clutch disc will fit on these teeth. (1 clutch disc per side).
This limits lockup to 25% locking in modern e30/e36 LSD 168mm.
The rosetta stone early e30 LOW ratio unit happens to have the Vintage style long teeth spiders so that with machine work+custom internals a 3x or 4x clutch setup could be installed.
The older (e21/2002) units internally have longer spline teeth similar to a 188mm unit; those internal setups can be interchanged with custom internals into a newer e30 case capsule if desired; machine work and custom ground thicknesses of internals will be required.
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