LSD - how common?

[LarryE9E10]

Hi all!

Had the car ('73 U.S.-spec CS) on a lift the other day to touch up some bare spots on the undercoating. Spun one rear wheel and, much to my surprise, the other rear wheel spun in the same direction. How un/common is a LSD on an E9? Should I be smiling gently or laughing out loud?

PS. Weather permitting, the coupe and I will be at Lime Rock on Sunday!

 

[Peter Coomaraswamy]

Larry, was yours originally an automatic or 4 speed car? Mine was a '74 Automatic before converting to 5-speed. The diff is "open" and may be one of the things that contributes to its "lackluster" performance... but I'm working on it

 

[LarryE9E10]

Hmm...

As far as I know, mine came from the factory with a 4-speed.

 

[deQuincey]

it is a 1000 bucks smile, IMHO :lol:

 

[sfdon]

Unless someone was holding the other side that test is meaningless.
Sometimes they go backwards and sometimes one turns and the doesn't
move. Sometimes they move together and if you hold one side the other quits moving.
Go light your tires up in front of your idiot neighbors house and count the stripes.
2 stripes is a good number :]

 

[rsporsche]

Go light your tires up in front of your idiot neighbors house and count the stripes.
2 stripes is a good number :]

gotta like the way you think Don ...

 

[MyFemurHurts]

Go light your tires up in front of your idiot neighbors house and count the stripes.
2 stripes is a good number :]

:lol:8)

 

[x_atlas0]

If you had it up, you can also check the tag stamped on the bottom right edge of the diff unit, looking from back to front. There should be the ratio and (if a LSD) "S" stamped on a small flat section on the side of the diff. It is usually obscured by dirt so some scraping may be in order.

 

[deQuincey]

what does this mean

collection of figures in a diff:

 

[Ohmess]

So, 38.11 is 3:45, correct? Is there an S there somewhere or is this an open dif? If LSD, where would the S be located?

 

[Ian C]

On my cs its stamped below the 11, and in white paint high on the rear of the casing.

 

[Sven]

Here is a view of the unit in my garage. The 'S' is fairly obvious. You might take a wire brush to the side of yours to expose any stampings.

 

[vraned]

 

[bmwmadman]

I think were more common on the 2800cs as an option from factory. Or at least I have seen many 2800 with LSDs

 

[x_atlas0]

You can also get them from E12s and E12-based E24s. The other side loaders (E21, E1, M10-based E9s) are smaller.

 

[gwittman]

I think were more common on the 2800cs as an option from factory. Or at least I have seen many 2800 with LSDs

I thought the LSD was standard on the 2800CS. That is not based on certain fact though.

 

[pmansson]

I have LSD on all my cars

Strange that it was an option, and not a very popular or common one for that matter. A car of this standard really should have had it from the factory, and probably included in the outrageously expensive price of the car. In 1973 it was more expensive than a V12 Jaguar E-type !!!!
It really makes a difference when you drive, be it other than perfectly dry straight stretches or at low speed in cities. If you drive through a sharp corner using the throttle more than the brakes, they really nail the car to the road.

 

[Nicad]

My 71' and a 1970 I took apart last year both have limited slips despite not passing the single turning wheel test.

 

[MyFemurHurts]

My 2800CS has an open diff based on the driving experience. I'll have to check the pumpkin next time I have it on the rack.

 

[Honolulu]

IIRC, the "S" can be either painted onto or stamped into the metal. Oops, you know that already, I shoulda read page 2.