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Torque » Torque OBD ECU Scanner » Torque Discussion / Ideas » Trans temp, IAT, and MAP

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Author Topic: Trans temp, IAT, and MAP
m j
Member
Posts: 92
Post Re: Trans temp, IAT, and MAP
on: February 8, 2014 (GMT)

hmm couldnt log in on my android today.

the last time I looked at the spreadsheet was jan 20th. so it is not up to date. might get an evening to go through the threads and update it.
last thing I did was try and alphabetize it.

Capp777
Member
Posts: 2917
Post Re: Trans temp, IAT, and MAP
on: February 9, 2014 (GMT)

My list to date.

See MJ’s postings for his suggested names
for the OBS 7.3L. (Link below).

MAP psia OBS
Header: C410F1
Mode/Pid: 221452
Equation: (((A*256)+B)*0.00109)-15.88
Units: psia

MAP freq OBS
Header: C410F1
Mode/Pid: 221452
Equation: ((A*256)+B)*0.00390625
Units: Hz

Boost OBS
Header: C410F1
Mode/Pid: 221452
Equation: ((((A*256)+B)*0.00109)-15.88)-Baro()
Units: psi

Boost OBS (Alternate)
Header: C410F1
Mode/Pid: 221452
Equation: ((((A*256)+B)*0.00109)-15.88)-Val{“Baro42 psia”}
Units: psi

MAP kPa OBS
Header: C410F1
Mode/Pid: 221452
Equation: (((A*256)+B)*0.00752)-109.45
Units: kPa

IAT V
Header: C410F1
Mode/Pid: 22114A
Equation: ((A*256)+B)/13168
Units: Volts

IAT F OBS
Header: C410F1
Mode/Pid: 22114A
Equation: (((A*256)+B)*-0.00314)+193.34
Units: °F

IAT C OBS
Header: C410F1
Mode/Pid: 22114A
Equation: (((A*256)+B)*-0.00174)+89.65
Units: °C

IAT C Poly OBS
Header: C410F1
Mode/Pid: 22114A
Equation:
-0.00000000000196*(((A*256)+B)*((A*256)+B)*((A*256)+B))
+(0.000000196*(((A*256)+B)*((A*256)+B)))+(-0.00774*((A*256)+B))+147.5
Units: °C

TFT V
Header: C410F1
Mode/Pid: 2211BD
Equation: ((A*256)+B)/13168
Units: Volts

TFT F OBS
Header: C410F1
Mode/Pid: 2211BD
Equation: (((A*256)+B)*-0.00360)+212.98
Units: °F

TFT F Poly OBS
Header: C410F1
Mode/Pid: 2211BD
Equation:
-0.00000000000194*(((A*256)+B)*((A*256)+B)*((A*256)+B))
+(0.0000002*(((A*256)+B)*((A*256)+B)))+(-0.0096*((A*256)+B))+259.5
Units: °F

TFT C OBS
Header: C410F1
Mode/Pid: 2211BD
Equation: (((A*256)+B)*-0.00189)+95.35
Units: °C

Baro27 psia?
Header: C410F1
Mode/Pid: 221127
Equation: A*0.1
Units: psia?

Baro42 psia
Header: C410F1
Mode/Pid: 221442
Equation: ((A*256)+B)/27.67985874
Units: psia

Baro42 kPa
Header: C410F1
Mode/Pid: 221442
Equation: ((A*256)+B)/4.01463133
Units: kPa

Baro42 inH2O
Header: C410F1
Mode/Pid: 221442
Equation: (A*256)+B
Units: inH2O

MJ’s post for suggested names…

http://powerstrokenation.com/forums/showthread.php?t=299202&page=3

cowmilker08
Member
Posts: 6
Post Re: Trans temp, IAT, and MAP
on: February 9, 2014 (GMT)

Here is yeserday’s test on my 96. KOEO, using the formula’s in the 2-2-14 post.

According the the local weather the barometric pressure was 14.8 psia. The temperature was 14°F. I had the block heater plugged in though.

The throttle position PIDS didn’t respond to me pressing the gas pedal.

Capp777
Member
Posts: 2917
Post Re: Trans temp, IAT, and MAP
on: February 9, 2014 (GMT)

Thanks for the screenshot…since these numbers
are subject to change please check the list often
to verify you are still using the most up-to-date
equations.

Adjusted the IAT C Poly equation based upon your screenshot.
The differences are probably the errors between different
vehicles at this point. Note 4.0V for the sensor should be
slightly below 0 celcius.

Try adding the predefined displays for accelerator pedal position instead.

Also, I am having problems figuring what value is being
returned for [221442] in the Boost OBS Alternate pid
(since there are multiple pids using that pid number).

Adjusted the Boost OBS Alternate equation to reference value
by name.

FYI – I drive a MY1995 Jeep and cannot test these things
myself so I am totally dependent on feedback from others to
get these right.

As I am still experiencing problems accessing this forum
by phone I will be delayed with updating the posts as necessary.

With the new update of Torque, it might be worth revisiting
the original poly equations to simplify the equations to use the newly added ^ function.

Boost is deliberately adjusted to the positive side for
full use of display scaling.

cowmilker08
Member
Posts: 6
Post Re: Trans temp, IAT, and MAP
on: February 10, 2014 (GMT)

I read earlier that you can’t test anything due to your Jeep being OBD-I.

I will update my app and equations for the ^ functionality and your adjustments.

I am curious to compare how they work on my ’96 top my ’97. Especially since the TP PIDs didn’t respond to me pushing the pedal in my ’96.

What four data points did you use to generate your poly equations for IAT and TFT? Also, I’m curious what you mean by the linear eqn for TFT only being +/- 8° 68% of the time.

Capp777
Member
Posts: 2917
Post Re: Trans temp, IAT, and MAP
on: February 13, 2014 (GMT)

Picture a stretched “s” tilted at an angle with a line
through it. As you move up the “s” the values will be closer
then farther away from the line depending where you are on
the curve. Now picture a standard distribution turned
vertically on the line with the mean being centered on the
line.

+/- 8 degrees is like one standard deviation on the standard distribution. 68%.

The data I modeled came from my service manuals and from the
web for the sensors typical responses.

Both linear and poly equations havent been confirmed at higher
temps yet. GW1 had posted earlier that he would be checking
against a tft temp sensor he was installing. No news yet.

jschildm
Member
Posts: 29
Post Re: Trans temp, IAT, and MAP
on: February 20, 2014 (GMT)

I updated the equations with the latest updates from Capp. I messed with some of the throttle position stuff, but wasn’t able to get any of them to register. I have a snapshot of the latest equations below, as well as a picture from my camera at about the same time of my mechanical transmission temperature gauge for comparison.

Capp777
Member
Posts: 2917
Post Re: Trans temp, IAT, and MAP
on: February 21, 2014 (GMT)

Jschild:

I noticed that your Boost Alt is still reading off by
the baro amount…

Did you change the name in the boost alternate
equation to match your name of “baro42” ?

Thanks for the updates.

MJ:

Is all well?

My phone problem with the forum persists. I can read
the posts but am not able to post from my phone any
longer.

m j
Member
Posts: 92
Post Re: Trans temp, IAT, and MAP
on: February 21, 2014 (GMT)

all good,
cant see anything but the first page of the thread on my phone so can only check the thread at night or over breakfast coffee.

spent most of my ‘spare’ time lately
-doing head gaskets on a friends 3.0 3vz-e toyota.
-tearing apart my core 7.3 motor to get it ready for the machine shop
-dealing with ‘troubled’ teenagers my girlfriends youngest daughter decided to get tangled up with

you know, the usual :)

jschildm
Member
Posts: 29
Post Re: Trans temp, IAT, and MAP
on: February 21, 2014 (GMT)

For Boost Alt I did use the equation you had above, including the baro42 name. I am curious if it is supposed to be what is called the “short name” in torque, or the “long name”? I also copied it just as above, with Val{“Baro42 psia”}, so if some of that isn’t supposed to be in there then I can make changes.

The Poly transmission temp looks pretty darn close to me. I know this is still lower temps (115 – 120) but that’s as warm as mine is going to get with a 6.0 cooler on it until we get some hot weather here in Iowa, which isn’t looking like that’s going to happen a for while. If I haul a couple horses sometime in the near future I can get it then and it should be a little warmer.

Quote from Capp777 on February 21, 2014

Jschild:

I noticed that your Boost Alt is still reading off by
the baro amount…

Did you change the name in the boost alternate
equation to match your name of “baro42” ?

jschildm
Member
Posts: 29
Post Re: Trans temp, IAT, and MAP
on: February 21, 2014 (GMT)

I had updated the name of “Baro42” to “Baro 42 psia”, but I hadn’t replaced the gauge on the screen, so the name didn’t update. Would this have any effect on the actual calculations for the Boost Alt? I thought I added the boost alternate gauge after making the changes, but I just removed it and added it again to make sure, so we will see what it looks like if I try it out tomorrow.

Capp777
Member
Posts: 2917
Post Re: Trans temp, IAT, and MAP
on: February 21, 2014 (GMT)

Jschildm:

I am not certain of the exact syntax of the
boost alt equation: -Val{“Baro42 psia”}

If the quotes (“”) are needed?
If the short name can be used instead of the long name?
If Val is needed? (Based upon a recent Frodus post).

Ian posted Val{PID Name} where PID Name matches exactly
and is the untranslated name? Not sure what untranslated
means…

See links for math on page eight of this thread.

Since the Map Hz equation changed I am trying to adjust
the other Map based pids a little closer based on the new
Hz readings.

Adjusted IAT C Poly based upon your results.

Changed Baro27 to Hz.

Capp777
Member
Posts: 2917
Post Re: Trans temp, IAT, and MAP
on: February 21, 2014 (GMT)

My list to date.

See MJ’s postings for his suggested names
for the OBS 7.3L. (Link below).

MAP psia OBS
Header: C410F1
Mode/Pid: 221452
Equation: (((A*256)+B)*0.00109)-16.03
Units: psia

MAP freq OBS
Header: C410F1
Mode/Pid: 221452
Equation: ((A*256)+B)*0.00390625
Units: Hz

Boost OBS
Header: C410F1
Mode/Pid: 221452
Equation: ((((A*256)+B)*0.00109)-16.03)-Baro()
Units: psi

Boost OBS (Alternate)
Header: C410F1
Mode/Pid: 221452
Equation: ((((A*256)+B)*0.00109)-16.03)-Val{“Baro42 psia”}
Units: psi

MAP kPa OBS
Header: C410F1
Mode/Pid: 221452
Equation: (((A*256)+B)*0.00752)-110.45
Units: kPa

IAT V
Header: C410F1
Mode/Pid: 22114A
Equation: ((A*256)+B)/13168
Units: Volts

IAT F OBS
Header: C410F1
Mode/Pid: 22114A
Equation: (((A*256)+B)*-0.00314)+193.34
Units: °F

IAT C OBS
Header: C410F1
Mode/Pid: 22114A
Equation: (((A*256)+B)*-0.00174)+89.65
Units: °C

IAT C Poly OBS
Header: C410F1
Mode/Pid: 22114A
Equation:
-0.00000000000196*(((A*256)+B)*((A*256)+B)*((A*256)+B))
+(0.000000196*(((A*256)+B)*((A*256)+B)))+(-0.00774*((A*256)+B))+148.5
Units: °C

TFT V
Header: C410F1
Mode/Pid: 2211BD
Equation: ((A*256)+B)/13168
Units: Volts

TFT F OBS
Header: C410F1
Mode/Pid: 2211BD
Equation: (((A*256)+B)*-0.00360)+212.98
Units: °F

TFT F Poly OBS
Header: C410F1
Mode/Pid: 2211BD
Equation:
-0.00000000000194*(((A*256)+B)*((A*256)+B)*((A*256)+B))
+(0.0000002*(((A*256)+B)*((A*256)+B)))+(-0.0096*((A*256)+B))+259.5
Units: °F

TFT C OBS
Header: C410F1
Mode/Pid: 2211BD
Equation: (((A*256)+B)*-0.00189)+95.35
Units: °C

Baro27 freq
Header: C410F1
Mode/Pid: 221127
Equation: A
Units: Hz

Baro42 psia
Header: C410F1
Mode/Pid: 221442
Equation: ((A*256)+B)/27.67985874
Units: psia

Baro42 kPa
Header: C410F1
Mode/Pid: 221442
Equation: ((A*256)+B)/4.01463133
Units: kPa

Baro42 inH2O
Header: C410F1
Mode/Pid: 221442
Equation: (A*256)+B
Units: inH2O

MJ’s post for suggested names…

http://powerstrokenation.com/forums/showthread.php?t=299202&page=3

jschildm
Member
Posts: 29
Post Re: Trans temp, IAT, and MAP
on: February 24, 2014 (GMT)

I was able to get another screenshot the other day. This should be the latest equations. It appears that the boost alternate is now working correctly. To get it to work I believe I used Val{Longname}.

Capp777
Member
Posts: 2917
Post Re: Trans temp, IAT, and MAP
on: February 24, 2014 (GMT)

Jschildm:

Thanks for the feedback. Looks like the IAT Poly
has to be checked/adjusted with numbers above
0 deg C. The graph for the poly equation shows
a drop off below 0 degs C as the end of the “s” takes
a turn near that point. The linear equations
will not be accurate when the temps reach either end
of the “s”.

You may also need to readjust your EBP again since the
MAP values have changed.

Updated the IAT Poly equation based upon the latest data.

Updated the Val(…) to remove quotes.

Capp777
Member
Posts: 2917
Post Re: Trans temp, IAT, and MAP
on: February 24, 2014 (GMT)

My list to date.

See MJ’s postings for his suggested names
for the OBS 7.3L. (Link below).

MAP psia OBS
MAP psia
Header: C410F1
Mode/Pid: 221452
Equation: (((A*256)+B)*0.00109)-16.03
Units: psia

MAP freq OBS
MAP freq
Header: C410F1
Mode/Pid: 221452
Equation: ((A*256)+B)*0.00390625
Units: Hz

Boost OBS
Boost OBS
Header: C410F1
Mode/Pid: 221452
Equation: ((((A*256)+B)*0.00109)-16.03)-Baro()
Units: psi

Boost OBS (Alternate)
Boost Alt
Header: C410F1
Mode/Pid: 221452
Equation: ((((A*256)+B)*0.00109)-16.03)-Val{Baro42 psia}
Units: psi

MAP kPa OBS
MAP kPa
Header: C410F1
Mode/Pid: 221452
Equation: (((A*256)+B)*0.00752)-110.45
Units: kPa

IAT V
IAT V
Header: C410F1
Mode/Pid: 22114A
Equation: ((A*256)+B)/13168
Units: Volts

IAT F OBS
IAT F
Header: C410F1
Mode/Pid: 22114A
Equation: (((A*256)+B)*-0.00314)+193.34
Units: °F

IAT C OBS
IAT C
Header: C410F1
Mode/Pid: 22114A
Equation: (((A*256)+B)*-0.00174)+89.65
Units: °C

IAT C Poly OBS
IAT C Poly
Header: C410F1
Mode/Pid: 22114A
Equation:
-0.00000000000196*(((A*256)+B)*((A*256)+B)*((A*256)+B))
+(0.000000196*(((A*256)+B)*((A*256)+B)))+(-0.00774*((A*256)+B))+144.0
Units: °C

Equation (Alternate):
(-1.96*(10^-12)*(((A*256)+B)^3))+(1.96*(10^-7)*(((A*256)+B)^2))+(-0.00774*((A*256)+B))+144.0
Units: °C

TFT V
TFT V
Header: C410F1
Mode/Pid: 2211BD
Equation: ((A*256)+B)/13168
Units: Volts

TFT F OBS
TFT F
Header: C410F1
Mode/Pid: 2211BD
Equation: (((A*256)+B)*-0.00360)+212.98
Units: °F

TFT F Poly OBS
TFT F Poly
Header: C410F1
Mode/Pid: 2211BD
Equation:
-0.00000000000194*(((A*256)+B)*((A*256)+B)*((A*256)+B))
+(0.0000002*(((A*256)+B)*((A*256)+B)))+(-0.0096*((A*256)+B))+259.5
Units: °F

Equation (Alternate):
(-1.94*(10^-12)*(((A*256)+B)^3))+(2*(10^-7)*(((A*256)+B)^2))+(-0.0096*((A*256)+B))+259.5
Units: °F

TFT C OBS
TFT C
Header: C410F1
Mode/Pid: 2211BD
Equation: (((A*256)+B)*-0.00189)+95.35
Units: °C

Baro27 freq
Baro freq
Header: C410F1
Mode/Pid: 221127
Equation: A
Units: Hz

Baro42 psia
Baro psia
Header: C410F1
Mode/Pid: 221442
Equation: ((A*256)+B)/27.67985874
Units: psia

Baro42 kPa
Baro kPa
Header: C410F1
Mode/Pid: 221442
Equation: ((A*256)+B)/4.01463133
Units: kPa

Baro42 inH2O
Baro inH2O
Header: C410F1
Mode/Pid: 221442
Equation: (A*256)+B
Units: inH2O

MJ’s post for suggested names…

http://powerstrokenation.com/forums/showthread.php?t=299202&page=3

Capp777
Member
Posts: 2917
Post Re: Trans temp, IAT, and MAP
on: February 28, 2014 (GMT)

Great job Ian. My phone appears to be
working again!

jschildm
Member
Posts: 29
Post Re: Trans temp, IAT, and MAP
on: February 28, 2014 (GMT)

Capp – I just realized what you meant about adjusting my EBP because you realized later it was at idle and not KOEO. I probably won’t be able to do that before I get another screen shot.

MJ – What Mode and Equation are you using for your Accelerator Position? I tried very briefly what was listed on here before with no luck.

m j
Member
Posts: 92
Post Re: Trans temp, IAT, and MAP
on: March 1, 2014 (GMT)

221340
accel pos OBS
A*100/255
C410F1

I am chasing a bad miss on my 7.3
I have to get a compression tester adapted to fit the glowplug, I couldnt get the kit supplied one to clear the rockers

these PIDs would be nice to have working :)

PERDEL 1 Percent Delta Cylinder #1 (Misfire Data) Percent
PERDEL 2 Percent Delta Cylinder #2 (Misfire Data) Percent
PERDEL 3 Percent Delta Cylinder #3 (Misfire Data) Percent
PERDEL 4 Percent Delta Cylinder #4 (Misfire Data) Percent
PERDEL 5 Percent Delta Cylinder #5 (Misfire Data) Percent
PERDEL 6 Percent Delta Cylinder #6 (Misfire Data) Percent
PERDEL 7 Percent Delta Cylinder #7 (Misfire Data) Percent
PERDEL 8 Percent Delta Cylinder #8 (Misfire Data) Percent

Capp777
Member
Posts: 2917
Post Re: Trans temp, IAT, and MAP
on: March 1, 2014 (GMT)

MJ:

Did you ever try the equations
I posted on page 9?

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