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| + | FNK3wO <a href="http://nxhxeslbqjxu.com/">nxhxeslbqjxu</a>, [url=http://kbbfpfjzyway.com/]kbbfpfjzyway[/url], [link=http://ufmxjvysjotr.com/]ufmxjvysjotr[/link], http://myapevwwnjub.com/ |
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− | For a general description of Limited Slip Differentials, and how they work please see the External Links below.
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− | Generally Limited Slip Differentials are referred to as a Slipper or as an LSD. This contrasts to the normal differential fitted that is known as an [[Open Diff]].
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− | '''E30s with LSD as standard'''
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− | *[[325i Sport]]
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− | *[[M3]]
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− | All other E30s has an LSD as an option.
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− | LSD was *not* standard fit on the 318iS
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− | E30 LSDs are clutch plate type and require special oil - see below.
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− | '''Case sizes'''
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− | E30s had two differential case sizes, they are interchangeable and the same width but will require adjustment of the prop length. Please see [[Fitting an E30 Differential]].
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− | E30s used either a [[Small Case]] or [[Medium Case]] differential. Other models used a [[Large Case]] which is not directly interchangeable but the internals can be swapped.
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− | '''E30 LSD Ratios'''
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− | Below is a list of ratio and cars in which they can be found.
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− | *3.15 - M3
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− | *3.64 - prefacelft 325i
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− | *3.73 - facelift 325i
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− | *3.91 - facelift 325i touring, cabrio, 325i with getrag 260 sport
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− | *4.10 - found optionally on UK spec [[318i]]/[[318iS]] 2/4dr in [[Small Case]], and on all US [[M3]] models in [[Medium Case]].
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− | *4.27 -
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− | *4.44 -
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− | Please update the list of ratios and what cars they are found on and common case sizings.
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− | '''What these numbers mean'''
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− | Higher number == shortened gearing (quicker acceleration, more gear changes). Lower number == longer gearing (slower acceleration, longer time spent in each gear)
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− | '''How to identify and test an LSD'''
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− | To identify and LSD one can first check for the presence of the tag on the rear casing. The ratio on this will be prefixed with an S for LSDs.
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− | Alternatively one can jack up one rear wheel, ensure the car is out of gear and hand-brake is off then turn the raised wheel. Resistance on that wheel would usually indicate an LSD. An alternative method is to try to leave skid-marks pulling away on good tarmac, two tyre marks for more than a few inches would indicate a properly "locking" LSD. This won't work so well on grass or gravel as on loose surfaces both wheels can slip easier even for non-limited slip differential types.
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− | '''What oil to use for your LSD'''
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− | The BMW recommended oil is Castrol SAF-XJ
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− | You can find supplies from <please update>
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− | '''Durability, Rebuilds and Upgrades'''
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− | <please update with details of rebuilders in various locations, recommended rebuild intervals etc>
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− | '''External Links'''
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− | *[http://en.wikipedia.org/wiki/Limited_slip_differential Wikipedia's Limited Slip Differential Entry]
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− | *[http://auto.howstuffworks.com/differential.htm How Stuff Works - Differentials]
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− | *[http://www.youtube.com/watch?v=Am9Jvj4Bdjw Video of open and LSD rotation]
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