rammertide07
Full Access Member
Yea, thats what some other guys I've talked to said as well. One guy at the transmission shop said they just may not WANT to do it. Will the Autoenginuity do it for sure?
Spedometer calibration for bigger tires
- Thread starter rammertide07
- Start date
Yea, thats what some other guys I've talked to said as well. One guy at the transmission shop said they just may not WANT to do it. Will the Autoenginuity do it for sure?
rammertide07
Full Access Member
I think the hessitation may be from installing my new exhaust. I'll get Tony to reburn my chip and see how it acts then. BUT, I'm still open to ideas
DaveBen
SDD Senior Member
Zmann ARGH
Full Access Member
I don't have a 7.3 so not 100% sure on the AE doing a re calibration
you can only pull up menus for what it is plugged into so I can't check sorry
you can only pull up menus for what it is plugged into so I can't check sorry
rammertide07
Full Access Member
Wouldn't jacking your truck up and wrapping a string end-toend, and taking that measuremnt three times give you the same thing as rolling three revolutions from the mark on the ground.
doh:....what a headache)
Zmann ARGH
Full Access Member
LOL! I never read any of this but it seemed to work for the dude .. I wouldn't be jacking my truck up either lol
rammertide07
Full Access Member
"First, you'll need to know the actual height of the tires, not the
nominal height of 35" that's printed on the sidewall. To get that,
make a mark on the edge of the tire at the ground, and mark the ground
directly under the mark. Now, roll the truck far enough for the tire
to have made three revolutions. When your mark on the tire is at the
very bottom, near the ground, mark the ground again, and measure the
distance between the two marks on the ground. Divide that distance by
three, since there were three revolutions of the tire, then divide
that number, (which is the circumference of your tire,) by 3.14. The
answer you have is the true height of your tire. Write that number
down, because you'll need it for the next step. Divide 30282 by your
actual height. If your true height is 34", the math goes something
like this: 30282/34=891. That would be your speedometer calibration
code."
"To set the calibration, ground the single wire connector under the
glove box it says PSOM (Programmable Speedometer Odometer Module).
"Yes there is only one and it has a spade type plug on the end". I
used a wire with clips on both ends to ground the plug to a screw
under the dash or try a test light and use the clip end to the PSOM
and the other jam in a door hinge. Now look at your speedometer on the
face of your dash while sitting in the drivers seat and there should
be a "reset" button and a "select" button. While holding the reset
button in on the trip meter, turn the ignition to 'on' while the wire
is still grounded. Let go of the reset button. The speedometer display
will sweep once and will show a code of some kind then push in again
the "reset" button and the existing code will be displayed with
RECAL?, mine said 976 RECAL? Now you enter your new code you came up
with by dividing the rolling measurement by PI or 3.14 by pushing the
"select" button until it gets to the new calibration code number. You
may have to push "select" a whole bunch of times until you get to your
code. If you turn off the key at this point the original code will not
be changed or any of the 6 lives will not be used. To store your new
code press "Reset". Turn off the key. Unplug the ground wire."
That first point seems kinda pointless to me...but I also think I'm not understanding it correctly. If you roll the tire three times and then devide length of point A to point B (where the tire started and ended) you end up with the same measurment as if you only rolled the tire one time.
Example: If the tires rolls 3' on one revolution, that would be 9' for three revolutions. Devide 9' by 3 and you get 3'
nominal height of 35" that's printed on the sidewall. To get that,
make a mark on the edge of the tire at the ground, and mark the ground
directly under the mark. Now, roll the truck far enough for the tire
to have made three revolutions. When your mark on the tire is at the
very bottom, near the ground, mark the ground again, and measure the
distance between the two marks on the ground. Divide that distance by
three, since there were three revolutions of the tire, then divide
that number, (which is the circumference of your tire,) by 3.14. The
answer you have is the true height of your tire. Write that number
down, because you'll need it for the next step. Divide 30282 by your
actual height. If your true height is 34", the math goes something
like this: 30282/34=891. That would be your speedometer calibration
code."
"To set the calibration, ground the single wire connector under the
glove box it says PSOM (Programmable Speedometer Odometer Module).
"Yes there is only one and it has a spade type plug on the end". I
used a wire with clips on both ends to ground the plug to a screw
under the dash or try a test light and use the clip end to the PSOM
and the other jam in a door hinge. Now look at your speedometer on the
face of your dash while sitting in the drivers seat and there should
be a "reset" button and a "select" button. While holding the reset
button in on the trip meter, turn the ignition to 'on' while the wire
is still grounded. Let go of the reset button. The speedometer display
will sweep once and will show a code of some kind then push in again
the "reset" button and the existing code will be displayed with
RECAL?, mine said 976 RECAL? Now you enter your new code you came up
with by dividing the rolling measurement by PI or 3.14 by pushing the
"select" button until it gets to the new calibration code number. You
may have to push "select" a whole bunch of times until you get to your
code. If you turn off the key at this point the original code will not
be changed or any of the 6 lives will not be used. To store your new
code press "Reset". Turn off the key. Unplug the ground wire."
That first point seems kinda pointless to me...but I also think I'm not understanding it correctly. If you roll the tire three times and then devide length of point A to point B (where the tire started and ended) you end up with the same measurment as if you only rolled the tire one time.
Example: If the tires rolls 3' on one revolution, that would be 9' for three revolutions. Devide 9' by 3 and you get 3'
Zmann ARGH
Full Access Member
repost ,, now my brain hurts
lol
lol
bigrigr
Real trks hv 3 pdls
They want you to do it three times to even out any discrepencies in your roll. You might rol it one revolution, three different times and end up with three different measurements. Possible it makes it more accurate to roll it once three revolutions, to get it right the first time. JMO
dieseldork
dieseldork
Isnt that mod only for the OBS trucks?