Speedometer Recalibratin

[KA240SX808]

So my next S14 is gonna be a Canyon Carver/Touge Runner and I'm gonna be using a 4.364 FD so I know the Speedometer is gonna be off.
Which of these two wires would I splice (28 or 35) to calibrate the Speedometer. I'll be using the Dakota Digital SGI-5. Also will this affect ABS operation?

Diagram:

[Epstein]

WAT.

Pull the speedo out of the cluster. Find the set of solder jumpers on the back. Jumper #6, which is a 6.3% change. 4.363 is a 6.8% change, which is close enough. If 6 is already jumpered, open it and jumper #7. I did this in my S14 and it's dead nuts on with a 4.363. Was speeding doing 64 on the speedo. Cop says, "this is a ticket for 64mph". Proven! haha

Here's some pretty pics:

http://forums2.freshalloy.com/showthread.php?t=124389

[KA240SX808]

Crap totally forgot about that, thought that only applied to the JDM Clusters. So in addition to the 6.5% from the FD I'm going to be using 235/40/18 Tires which are 2% taller then the stock size. to I would need to add a total oh 4.5% correct?

I feel special for forgetting about that lol

[KA240SX808]

Verification?

[Matt93SE]

sounds about right to me.

Do you have a GPS, or can borrow one?
fix it at 4.5% and then take the GPS for a drive on some straight highway where you can set the cruise. I doubt there's much of that in Hawaii, but I'm sure you can figure something out.

check the speedo vs the gps's reading and adjust from there.

[Cory]

I would just buy a GPS and not care about the stock speedo anymore...

[ZainRacer]

I would just buy a GPS and not care about the stock speedo anymore...

X2

I use a GPS in my S13 because my HUD stopped working...
GPS is accurate and digital!

[Epstein]

Crap totally forgot about that, thought that only applied to the JDM Clusters. So in addition to the 6.5% from the FD I'm going to be using 235/40/18 Tires which are 2% taller then the stock size. to I would need to add a total oh 4.5% correct?

I feel special for forgetting about that lol

This is correct. Just add up the jumpers on the back of your speedo as per the link, then add 4.5% more to it.

[shoes59]

I would just buy a GPS and not care about the stock speedo anymore...

I never thought of that but great idea. I'll use a friends GPS to set my speedometer correctly after installing my Dakota unit.

[Jeremiah]

I wired my dakota digital unit directly into the back of the cluster. Mine is probably a bit different than what you guys are doing since I'm using a much different signal from the t56 in my car.



The wires in the pic above are:
red wire is 12v to power the unit
black is ground
green is speed signal coming from ls1 vss
yellow/red stripe is output going to the cluster.

Its mounted under the passengers side air bag cover. Its real easy to calibrate, just push the "up" or "dn" button.