Speedometer correction factors

Jeroen · Post by **Jeroen** » Sat Apr 22, 2006 12:37 am

Trying to get a complete list of all E21 speedo correction factors. As the speedo is driven from the gearbox, a correction has to take place for compensate for the different diffs.

Can U all check what factor is in the small print at the bottom of your speedo dial?

One note... on the earlier instrument clusters the speedo didn't mention the factor on the dial.

Thanks to everyone for contributing, please mention engine type, cars' build date and factor.

Kpeters · Post by **Kpeters** » Sat Apr 22, 2006 12:57 am

Hmm lets see, im taking the one i took of from my car (i think its the original) since the one im using now is probably from a 323i.

This one should be right:

Let's see: W=0808 EG

-320/6
-1981 February.

Kpeters · Post by **Kpeters** » Sat Apr 22, 2006 12:58 am

Ahh BTW: the speedo i have currently installed reads 0808 also.

I have a mph/kph 78' 320i USA speedo but it doesent read anything.

Madhatter · Post by **Madhatter** » Sat Apr 22, 2006 8:35 am

W=0762 EG

323i with 5 speed (getrag 245), built sept 1982.

hadrian · Post by **hadrian** » Sat Apr 22, 2006 8:47 am

My 1982 323i doesn't have it written on the speedo.

Kpeters · Post by **Kpeters** » Sat Apr 22, 2006 10:33 am

Looks like preface lift models have no numbers in it, and that I have 2 320/6 speedos

.

ichiwan2 · Post by **ichiwan2** » Sat Apr 22, 2006 4:47 pm

My original speedo had this:

W=0808 EG

320/6 1982/83
220km/h
3.64 differential

My present speedo is actually meant for 323i - shows speeds higher by about 5%. Will be changing my diff to 3.45 when I stroke my 320/6 to 323/6.

fm realoem.com

Part 62121364333 (SPEEDOMETER) was found on the following E21 vehicles:

E21 323i SEDAN, M20, Euro, AUTO (1841) : SPEEDOMETER
E21 323i SEDAN, M20, Euro, AUTO (3081) : SPEEDOMETER
E21 323i SEDAN, M20, Euro, RHD , AUTO (1842) : SPEEDOMETER
E21 323i SEDAN, M20, Euro, RHD , AUTO (3082) : SPEEDOMETER
E21 323i SEDAN, M20, Euro, MANUAL (1831) : SPEEDOMETER
E21 323i SEDAN, M20, Euro, MANUAL (3071) : SPEEDOMETER
E21 323i SEDAN, M20, Euro, RHD , MANUAL (1832) : SPEEDOMETER
E21 323i SEDAN, M20, Euro, RHD , MANUAL (3072) : SPEEDOMETER

http://bimmerforums.com/forum/attachmen ... 1132913414

I think the number reads as W-1220 EG or 1230 - can't really see from pic. Will have a look tomorrow.

MikeG · Post by **MikeG** » Sat Apr 22, 2006 6:06 pm

My 1983 320i built in October of 1982 with a 1.8 liter four and a manual 5 speed transmisson and no LSD for the USA market is

W-1360 SAE

MPH

Mike

Arnold · Post by **Arnold** » Sat Apr 22, 2006 7:44 pm

W=0762 EG 323i sept '79 4-speed.

regards.

Muke · Post by **Muke** » Sun Apr 23, 2006 12:17 am

0,911 = 4,10-differential (315)
0,911 = 4,11-differential (316-1,6, 318)
0,866 = 3,91-differential (316-1,8, 318i, 320/4, 320i-1,8i)
0,808 = 3,64-differential (320i-2,0, 320/6)
0,762 = 3,45-differential (323i)

Jeroen · Post by **Jeroen** » Sun Apr 23, 2006 1:14 pm

What more can we ask for, Muke? Thanks!

I was already sure about the 320/6 (0,808) and 323i (0,762) but this looks like the definitive list!

ichiwan2 · Post by **ichiwan2** » Sun Apr 23, 2006 4:17 pm

What diff would match the W-1220 EG?

rolfi · Post by **rolfi** » Thu Apr 27, 2006 2:27 pm

W=0808 EG

Muke · Post by **Muke** » Sat May 13, 2006 11:34 pm

Jeroen wrote:What more can we ask for, Muke? Thanks!

There is also one more differential. In 323i was 3.36-differential, but it was not stock. If you have 5-speed SPORT-gerabox, it´s possible to find that differential.

There is 11-teeth on the pinion and 38-teeth on the big wheel, when you have an 3.45-differential.
But... When you have an 3.36-differential, there is 11-teeth on the pinion and 37-teeth on the big wheel.

I hope you understand what i mean?

Tjaard · Post by **Tjaard** » Sun May 14, 2006 1:42 pm

W=0762 EG .... 323i build Oktober 1980