Speedometer correction factors

[3771489]

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)

..and with Mile scale:

number: range: model: diff:
1,465 0-120 315,316,318,318A 4,10 or 4,11
1,393 0-120 320(A)/4,316(A)1.8,318i(A),320(A)1.8i 3,91
1,300 0-140 320i(A(US)),320(A)/6 3,64
1,220 0-140 323i 3,45
1,360 0-140 320i(1.8i)US 3,91
1,266 0-140 320iA(1.8i(US)) 3,64

Btw 0,854 is from 520/4 or 520A/4

[jagclarke]

W - 1393 EG

1983 316 5 speed (eco? ) 3.91 diff ?

[Muke]

Btw 0,854 is from 520/4 or 520A/4

You are right.

[superj]

ok, this came out of a 4 cylinder american 320i with auto tranny.


no number on the face


sticker on the back


came out of the white one

[HaroldShand]

Hope you don't mind me replying to this old post, but as you appear to be the resident expert on these matters...

I have 2 problems with my speedo:

Chronic: speedo wavers from rest up to speed then settles.
Acute: the mileometer and trip meter stopped turning today.

My mechanic has advised replacing the speedo as he is unable to fix the gears and a friend told me that replacing the cable would stop the juddering needle problem.

Going with this advice to replace both, I just want to make sure I get the right parts !

I have a 1982 UK 323i automatic. I have standard 5.5x13 wheels shod with 205/60 R13 86H tyres all round. Taking into account the non-standard tyres, is there a more appropriate speedo to get than the one I currently have ? ( W = 1.220 EG )

Kind regards, H

[Arnold D]

Mine is a 323i, build 3/1981. Has a 5 speed sport and limited slip diff.

W 0,762

According to my GPS, 1 KM off.


Tyres 195-55-15

[Peter V.]

Mine is a 323i with an Eco-fivespeed gearbox and a standard 3.45 diff

W = 0762

According to the tomtom it is right-on. The original tyresetting so 185/70 13.

[Arnold D]

My Alpina B6-2.8 built 10-1980.

Sticker on the back says W762. Limited slip diff.

[mcjjordan]

1.393

1980 316 4 speed uk mph
it screams on motorway!!! really too high revving

[Jeroen]

Fits the list posted previously I guess:

1,465 0-120 315,316,318,318A 4,10 or 4,11
1,393 0-120 320(A)/4,316(A)1.8,318i(A),320(A)1.8i 3,91
1,300 0-140 320i(2.0iA(US)),320(A)/6 3,64
1,220 0-140 323i 3,45
1,360 0-140 320i(1.8i)US 3,91
1,266 0-140 320iA(1.8i(US)) 3,64

[mcjjordan]

1.393

1980 316 4 speed uk mph
it screams on motorway!!! really too high revving

70mph its revving at 4000rpm!

[mcjjordan]

found a lovely calculator for working out variants

http://johnmaherracing.com/calculators/ ... alculator/

[mcjjordan]

So i have 2 speedos
1393 & 1300
So what diff ratios are these for?

[Jeroen]

See page 2

[petroscf]

My car original speedo is the one without anything written on it. (Pre facelift 316 1.6 with 4 speed manual and 4.10 open diff)
With the engine (and diff and gearbox) swap the new set up is: W=0762eg speedo, with 3.64 diff and sport 5 speed gearbox (5th gear is 1:1)
So I guess that my current speedo is probably from a 323i, thus, made ideally to match a 3.45 diff?
How should these correction factors be interpreted exactly? I haven't understood