s14 speedometer correction with z32 tranny the free way

[gsracer]

First off let me thank knate from freshalloy for his kph conversion thread because that pointed me in the right direction although this is a little different.

Now most of us run z32 trannys via the mazworx kit, on ka's sr's and vh's like me in our s14s and as you know the speedometer doesnt read right, actually very high ie 50mph is like 120, as a result i havent had a speedometer for over 2 years and it has realy irrated me.

Now you could probably spend the money and buy the dakota digital converter or you can do these few easy steps that are free and get the same result.

First step is to take the speedometer out of the cluster.



now you turn it around and look at the circuit board on the top you will see the letters ADJ with numbers, these are the adjustments.

Now unfortunatly i did not take pictures before i started, but the circled portions are what is soldered from the factory.





This is the tricky part, given what diff you are running and your tire size it can change the percentages of where it needs to be.

My setup is j30 (3.90) rear with 18s out back, most 18 tires are 25.2-25.6 inch diameter so this should cover all popular non stretch sizes

what you need to do is solder pin 9 together, bridge the gap so to say and desolder pin 7, open the gap. As shown in the rear picture.

This got me exact on my car tested up to 100mph.





Now thru the miracle of mathmagic, i was able to come with a combo that should get you close for a stock application 205/55/16 with a 4.08 rear diff, it should be plus or minus 2 % ( ie at 100mph you could either really be going 98 or 102)

You still need to solder switch 9 and 6 and still desolder switch 7





Im still working on the odometer, still reads twice as high but im sure theres a fix for that as well. Ill update it when i get it sorted.