ummm...wtf is this?
Thread Starter
1st Gear Member
Joined: May 2012
Posts: 72
From: georgia
That's what I was thinking, but my speedo is off a good 20 mph so I'm not sure. There is a hole drilled right beside my shifter so I'm assuming it goes somewhere by my trans, but I haven't followed it yet. The gears were in and the speedo was off when I bought the car, the dealership ordered a calibrator but they never could get it to work. They actually threw it off worse than it already was so I just never went back and figured I would wait til I got a programmer. I assumed they had kept the part but maybe that could be it.
Thread Starter
1st Gear Member
Joined: May 2012
Posts: 72
From: georgia
Finally, after hours of googling it appears you are correct sir. I found something that looks just like it on late model resto's site, apparently its a speed cal. Now to figure out how it works! Thanks for the help!
TECH SAVANT
Joined: Dec 2006
Posts: 10,937
From: Saint Augustine, FL
The Dallas label must have fallen off, here are the instructions.
To set it for your car, first set the DIP switches to 0010000000, which is a multiplier of 1.000, then use a GPS or other means to determine your actual speed and the speedometer reading at that real speed.
For sake of argument let's say that at an actual speed of 60 mph the speedometer reads 68 mph. Divide the speedometer reading by the actual speed:
68/60 = 1.133;
Now, using the chart in the SpeedCal instructions, find the multiplier (3rd column) that is closest to 1.133, turns out that is 1.131:
BUT... Note that just above 1.131 in the table is the recommended value for 3.73 gears installed in a car that originally had 3.27s, like your 2001 Cobra. It is much more likely that your car has 3.73 gears than 3.60, so use the 1.141 value and set the DIP switches to:
0010010010
Actually it doesn't really matter because the speedometer is not that accurate, however you can play with the DIP switch settings to dial it in for your car, tires, etc.
FWIW the DIP switch setting is the binary representation of the Indicated Speed/Real Speed * 128.
To set it for your car, first set the DIP switches to 0010000000, which is a multiplier of 1.000, then use a GPS or other means to determine your actual speed and the speedometer reading at that real speed.
For sake of argument let's say that at an actual speed of 60 mph the speedometer reads 68 mph. Divide the speedometer reading by the actual speed:
68/60 = 1.133;
Now, using the chart in the SpeedCal instructions, find the multiplier (3rd column) that is closest to 1.133, turns out that is 1.131:
BUT... Note that just above 1.131 in the table is the recommended value for 3.73 gears installed in a car that originally had 3.27s, like your 2001 Cobra. It is much more likely that your car has 3.73 gears than 3.60, so use the 1.141 value and set the DIP switches to:
0010010010
Actually it doesn't really matter because the speedometer is not that accurate, however you can play with the DIP switch settings to dial it in for your car, tires, etc.
FWIW the DIP switch setting is the binary representation of the Indicated Speed/Real Speed * 128.
Last edited by cliffyk; Aug 27, 2012 at 03:28 AM.
2nd Gear Member
Joined: Aug 2012
Posts: 169
From: North Carolina
The Dallas label must have fallen off, here are the instructions.
To set it for your car, first set the DIP switches to 0010000000, which is a multiplier of 1.000, then use a GPS or other means to determine your actual speed and the speedometer reading at that real speed.
For sake of argument let's say that at an actual speed of 60 mph the speedometer reads 68 mph. Divide the speedometer reading by the actual speed:
68/60 = 1.133;
Now, using the chart in the SpeedCal instructions, find the multiplier (3rd column) that is closest to 1.133, turns out that is 1.131:
BUT... Note that just above 1.131 in the table is the recommended value for 3.73 gears installed in a car that originally had 3.27s, like your 2001 Cobra. It is much more likely that your car has 3.73 gears than 3.60, so use the 1.141 value and set the DIP switches to:
0010010010
Actually it doesn't really matter because the speedometer is not that accurate, however you can play with the DIP switch settings to dial it in for your car, tires, etc.
FWIW the DIP switch setting is the binary representation of the Indicated Speed/Real Speed * 128.
To set it for your car, first set the DIP switches to 0010000000, which is a multiplier of 1.000, then use a GPS or other means to determine your actual speed and the speedometer reading at that real speed.
For sake of argument let's say that at an actual speed of 60 mph the speedometer reads 68 mph. Divide the speedometer reading by the actual speed:
68/60 = 1.133;
Now, using the chart in the SpeedCal instructions, find the multiplier (3rd column) that is closest to 1.133, turns out that is 1.131:
BUT... Note that just above 1.131 in the table is the recommended value for 3.73 gears installed in a car that originally had 3.27s, like your 2001 Cobra. It is much more likely that your car has 3.73 gears than 3.60, so use the 1.141 value and set the DIP switches to:
0010010010
Actually it doesn't really matter because the speedometer is not that accurate, however you can play with the DIP switch settings to dial it in for your car, tires, etc.
FWIW the DIP switch setting is the binary representation of the Indicated Speed/Real Speed * 128.
Now THAT is a question answered!