GSR speedo "K" value

[marinetowing]

I have a VDO rally computer that I intend on putting in my GSR to use for targa recce to measure stage distances, this thing hooks up to the speedo wire (from which I can gather is the yellow/white wire in the ecu?) but to calibrate the speed pulse I need the "k"value of the speedo....apparently every vehicle speedo has a K value and is usually indicated by a label or stamp on the back of the cluster.

Would anyone know what this value might be for a GSR, or have a cluster laying around that they could check for a marking?

Cheers guys

 

[BMGTZ]

from what I remember of using the rally computers the easiest way to calibrate the units was to find the pulse wire and then drive over a measured distance of known accuracy. count the pulses that the wire outputs and then add that info to the rally computer.

does that help?

 

[marinetowing]

Cheers Brian

The coralba unit in my tme works like you suggest but the one I want to put in the GSR is a VDO and it uses speed pulse for distance but has no calibration input option apart from entering the K value of the speedo then dividing that value by 6 and entering that figure into the unit.

I have never heard of this value before but google says that every speedo has one, it's just finding it that seems to be the problem!

I don't really want to have to resort to pulling out my cluster to find a number that may not be present, was hoping someone may have one lying around they could check, or know if there is in fact a stamping on there.

 

[(2much)]

i have one at home but i'll only be able to check it tomorrow..

 

[marinetowing]

Nick....as usual a true gentleman

 

[philsth]

HI, after reading this post I was curious as to this K thing. Here is a post on another site that may help or not LOL.
how K is determined

Sorry it doesn't give you the number your after though.

Cheers

 

[(2much)]

Sorry Scott, I forgot, and im away atm, if your not in a hurry, I'll check when I'm home

 

[marinetowing]

Sorry Scott, I forgot, and im away atm, if your not in a hurry, I'll check when I'm home

Cheers Nick, no rush at all

 

[khubner1]

if i get my gsr cluster before he gets back i'll see if i can find this k value on it for you.

 

[to4garret]

HI, after reading this post I was curious as to this K thing. Here is a post on another site that may help or not LOL.
how K is determined

Sorry it doesn't give you the number your after though.

Cheers

That is a fantastic post!

 

[marinetowing]

A massive thanks to Nick (2much) for supplying me with the following picture, for those that are interested here is the K value for a GSR speedo

 

[Paul]

I just checked my evo one. Exactly the same.

Though the pic you posted (2much's cluster) above seems to be the 180km/h jspec gsr/evo, not the 240km/h.

 

[khubner1]

if you want a 240km/h one i've got one here. do i need to pull the faces off to see it?

 

[EVOCPE]

Its the same as the EVO 1 cluster i have and the same as the GLXi cluster