Speed cal. HOw??

it's never plug an play, you need car specific dip switch settings. Call dallas mustang, they are really helpful and will give you a dip switch code that'll work perfectly

Matts89Notch said:

Ok my friend has a 96 GT and we tried to get this speed cal. in one time before and failed. It came with some not so great instructions but we found better ones online with pictures...the weird part was we still got stuck....

Who here has used them and how did you just "plug n' play"?? It's anoying having your speedo off like 10-20mph and we need HELP . Any tips one how to get this thing in the car?

Click to expand...

Dood, if he has a 96 can't he just get a speedo gear for the vss to correct it?

The correct switch settings are online somewhere. Pretty stright forward from what I read.

My speed cal quit working all together so I had to disconected it to pass inspection. I need to play around with it some more to see if I can get it working. <end rant>

He already has the speedcal, and doing it this way works fine. the dip switch calculator didnt work for me, calling them is the only thing that solved it.

Yeah, I got that part. I just don't understand why someone would get a speed cal if all they had to do was just install the speedo gear. Much easier IMO and less room for error. Maybe this is a stupid question but I really don't see why you would want to do that when there is a much easier fix?

I don't know about the standard transmission cars, but I will comment on the auto's. Anything greater than 3.73's with the 4R70W should be corrected with a Speedcal in a 96 - 98 RWD Ford. Anything greater than 4.10's has to be corrected with a Speedcal.

Is the Speedcal hooked up and giving you an error of 10 - 20 MPH or is that the error right now. Kind of hard to help you out until it is known which it is.

blurred10 said:

Yeah, I got that part. I just don't understand why someone would get a speed cal if all they had to do was just install the speedo gear. Much easier IMO and less room for error. Maybe this is a stupid question but I really don't see why you would want to do that when there is a much easier fix?

Click to expand...

Because a speedo gear will get eaten up eventually and you'll have to install a new one. Additionally, a speedo gear isn't nearly as accurate as a speedcal.

Here is a writeup I made for my site
http://www.svt4u2try.com/Tech.html


DMP Speedcal
1. Remove the negative battery cable.

2. Set bank 2 switch settings as follows 1000000

3. Remove the shift knob, outer shift boot, and inner shift boot. It will be easier to remove the cigarette lighter/auxillery
jack/traction control. The outer boot can be snapped off with eas. The inner boot requires an 8mm socket.

4. Route the Speedcal harness down the drivers side of the transmission, and re-install inner boot. Place the Speedcal to
either the front or rear of the inner boot. I placed it to the front under the cd player.

5. Using a scrotch lock, connect the red power wire of the Speedcal to a 12 volt power supply, like the cigarette lighter hot
wire. Usually this is a blue/white wire.

6. Under the vehicle , locate and remove the Vehicle Speed Sensor(VSS) located on the driver's side of the transmission.

*** not the Output Shaft Sensor (OSS) which is located at the rear***

7. Pull out the VSS and with a small flat head screw driver remove the red thin contact lock from the connector shell. Then
carefully slide the screwdriver down each side of the contacts and pop the retainers and remove both contacts from the
connector shell.

8. Take the connector shell and lay in down where the flat part is down. Then install the green wire from the speedcal in
the left contact hole, and the blue wire in the right contact hole until you hear a faint click. Then re-install the red contact
lock.

** If the contacts are locked in properly, you will not be able to pull the wires out unless you release the contact retainer**

9. Reconnect the VSS back on the transmission.

10. Now the two old VSS wire you need to determine which wire is the ground wire. On a 94-98 Mustang it is a pink/orange
wire, and on a 99+ it is a gray/red wire.

11. Find the supplied connector shell from the Speedcal package, and wire in the ground wire from the old VSS, making
sure it will match up with the gray wire from the main harness on the Speedcal. Then install the final old VSS wire in the
only other connector hole in the connector shell and snap that into the Speedcals main harness connector making sure
the old power wire matches up with the gray wire on the speedcal. You can hold up the excess wiring by using EZ ties.

** these are held in the same way as the VSS connectors are**

12. Reconnect the battery and set the bank 1 switches for the proper ratio. You can access this formula and others here


Troubleshooting.

The Speedometer does not move at all.

Make sure the red power wire is installed

Make sure that Bank 2 is set 1000000

Make sure all wires are installed properly and in order

Make sure you did not blow a fuse

I hope this helps you to have an easy install of your DMP Speedcal