speedo gearing and diff question

[jp02ti]

ok, I've read about it here:

http://www.bmw2002faq.com/component/option,com_forum/Itemid,0/page,viewtopic/t,316191/view,next/sid,5318dd7b8ae76529673cacd8fbf35a51/

and again here:

http://www.bmw2002faq.com/content/view/17/32/

and this all suggests that a 3.45 rear end, LSD or not, came only on the Euro tii and then again on some e21.

HOWEVER -

I have in my possesion a speedo with a casting data of 6 68. the gearing on the back shows W:1.24, which according to this belongs mates to a 3.45 rear end.

http://www.bmw2002faq.com/component/option,com_forum/Itemid,57/page,viewtopic/t,308713/highlight,speedo/

so, if all of that is true, then I'm in trouble here, as it can't be tii or e21 with a castng date of '68.

any ideas folks? what could this speedo mate to with a casting of '68 and a W:1.24 ratio?

thanks,

Jon

[c.d.iesel]

does this help you ?:

bahnstormer wrote:

diff match for a 3.45? Thanks!!!

3.45:1 diff -- W=1.24 speedo

3.64:1 diff -- W=1.297 speedo (W=1.30 is close enough)

3.90:1 diff -- W=1.39 speedo ('76 49-State 2002)

3.91:1 diff -- W=1.393 speedo (E21 320is LSD)

4.10:1 diff -- W=1.4 speedo (1.461 calculated)

4.11:1 diff -- W=1.4 speedo (1.465 calculated)

4.38:1 diff -- W=1.559 speedo (calculated)

_________________

ClayW

1967 1600-2

Project Blog

1521145

maybe you didn't see these results -=>

http://www.bmw2002faq.com/content/view/60/61?cx=partner-pub-2478521489155222%3Aeolm2n-2i1w&cof=FORID%3A9&ie=ISO-8859-1&q=speedo+ratios&sa=Search&siteurl=www.bmw2002faq.com%2Fcontent%2Fview%2F60%2F61%2F

[jp02ti]

not really much help.

the problem is its a W:1.24 speedo with a '68 castong. if it is true that a w:1.24 mates to a 3.45 then it should not have a casting earlier than '72, right? to fit a euro tii. so what does this speedo mate to with a '68 casting and being W:1.24??

[c.d.iesel]

i'M kunfused with what your tring to du ?

what :

year car____

model______

trans____

diff ______

country _______

are you trying to get a speedo for

[TobyB]

Look at the options for a 2000, and also for a 2002-

if the factory offered the gearset, it stands to reason

that they also offered the speedo-

and dang, unless it's off a bigger car, that's not a common bit

you have there...

I'm thinking the CS, etc, might have had the lower ratio

for the bigger engine...

That's all I got.

t

[02Les]

The 2800CS had a 3:45 rear end.

[jp02ti]

Let me try and clarify.

in the garage, I have a gauge cluster which appears to be 2002. it has a 12V clock and a W:1.24 speedo in it.

both the clock and the speedo have an inspection stamp from 6 68. the speedo has 6 68 stamped into the back of it, opposite to the W:1.24.

what car is this from??

the FAQ lists this speedo as mating to a 3.45 rear end.

the following cars were being built in 6 or 1968, with the the following diffs, as per realoam:

1600ti 3.90 or 3.91

1600 cabrio 4.10

1600GT 3.64

1600, 1602 4.10 or 4.11 LSD

2002 3.90, 3.64 or 3.64 LSD

it sounds to me like the 3.45 rear end only came on later model cars. if that is right then

what car does this speedo W1.24 speedo from 6 '68 belong to? (CD, this is the question...)

[jp02ti]

alright, according to this post, the W:1.24 should come out of a 1602.

http://www.bmw2002faq.com/component/option,com_forum/Itemid,57/page,viewtopic/t,328497/highlight,speedo+overlay/

is there anybody who can verify?

[jimk]

Do it like this for any speedo:

The number stamped represents the number of speedometer cable turns in a mile / 1000, i.e. 1.24 means 1,240.

Calculate your turns and do a match.

Cable turns to driveshaft turns is 1:2.5 in all the transmissions, same gear.

Now you know the rule, no need to memorize which goes with which.

[bnam]

It is frustrating to read this thread when the repliers (while intending to be helpful) don't seem to have really read the question being asked.

Do it like this for any speedo:

The number stamped represents the number of speedometer cable turns in a mile / 1000, i.e. 1.24 means 1,240.

Calculate your turns and do a match.

Cable turns to driveshaft turns is 1:2.5 in all the transmissions, same gear.

Now you know the rule, no need to memorize which goes with which.

[KFunk]

It is frustrating to read this thread when the repliers (while intending to be helpful) don't seem to have really read the question being asked.

Yeah... it's not just this thread. I don't quite get why many people aren't quite capable of reading a thread, and instead simply respond with the same canned answer that they use every time.

I almost lost my cool in my transmission thread after the 2nd time I had to re-state the same information that had already been posted once or twice in the same thread.

I know they're usually trying to be helpful, and I appreciate that..... but please, read the information currently being presented, and try to have a new thought on the matter that actually addresses the question. It gets really frustrating, and often times I don't even bother to post my questions on the forum because I know I'm not going to get any new ideas.

[c.d.iesel]

O.K. - now we're getting someplace.

Now we need a front, and back close-up photo of this

cluster for positive i.d.

It now sounds like a Neue Klasse model.

WE NEED TO SEE IT .

[jimk]

It is frustrating to read this thread when the repliers (while intending to be helpful) don't seem to have really read the question being asked.

Do it like this for any speedo:

The number stamped represents the number of speedometer cable turns in a mile / 1000, i.e. 1.24 means 1,240.

Calculate your turns and do a match.

Cable turns to driveshaft turns is 1:2.5 in all the transmissions, same gear.

Now you know the rule, no need to memorize which goes with which.

The poster wanted others to do his thinking for him. Now he can exercise his gray matter. It's called figuring shit out for yourself instead if crying for mama all the time.

[Mike Self]

early tii's were equipped with a 3.45 differential (and none were US versions) so this one with a 6/68 manufacture date is a mystery--unless it came from an NK sedan. I thought it might be from a Euro ti, but they had 3.64 diffs too.

A picture of the instrument's face would be helpful. Presume it's a "silver dollar" style speedo as fitted to early cars.

mike

[KFunk]

It is frustrating to read this thread when the repliers (while intending to be helpful) don't seem to have really read the question being asked.

Do it like this for any speedo:

The number stamped represents the number of speedometer cable turns in a mile / 1000, i.e. 1.24 means 1,240.

Calculate your turns and do a match.

Cable turns to driveshaft turns is 1:2.5 in all the transmissions, same gear.

Now you know the rule, no need to memorize which goes with which.

The poster wanted others to do his thinking for him. Now he can exercise his gray matter. It's called figuring shit out for yourself instead if crying for mama all the time.

Jim, what you contributed was an awesome explanation of how they get the number, and we appreciate that. But, please re-read the original post. The original poster clearly knows which diff corresponds to the W number. He doesn't need any help figuring out the diff ratio at all.

His question pertains to the equipment offered on various BMW cars.

Now you're accusing him of being lazy/dumb, which is not the case at all. Some people on this forum know all the equipment packages on all BMW cars, and some do not. It's not all in the archives, so sometimes we have to ask. But if you don't know how to read and answer a question, and subsequently accuse the original poster of being dumb and lazy, then it makes it even more frustrating to ever ask a question on here.

It's also endlessly frustrating to even have to explain ordinary conversational skills on a forum filled with adults, such as what I'm doing now. But, at some point it needs done.