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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

Capp777

Member
Posts: 2993

Re: Trans temp, IAT, and MAP
on: February 2, 2014 (GMT)

Any updates? Anyone?

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)-15.83
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)-15.83)-Baro()
Units: psi

Boost OBS (Alternate)
Header: C410F1
Mode/Pid: 221452
Equation: ((((A*256)+B)*0.00109)-15.83)-([221442]/27.67985874)
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

jschildm

Member
Posts: 29

Re: Trans temp, IAT, and MAP
on: February 3, 2014 (GMT)

See post 106 from this page on the powerstroke forum …

http://powerstrokenation.com/forums/showthread.php?t=299202&page=11

This is key one engine off. Both my boost and EBP have -baro() added to the end of them. You can see where they end up. You can also compare the TFT values to the EOT for reference. The square gauges in the bottom right are the poly TFT and poly IAT.

Thanks again for all of the work you guys have done so far. Let me know what items you would like me to try.

Capp777

Member
Posts: 2993

Re: Trans temp, IAT, and MAP
on: February 3, 2014 (GMT)

Thanks for the reply.

I am very interested in how well
the poly equations are doing at
higher temperatures. Your min / max
values didnt change much at KOEO.

A few observations…

Your EBP offset looks different than
MJs. Not sure whose sensor is closer
to spec.

Your IATf gauge appears to be using
an old version of span. Check your
equations against my list to be certain.

The IAT V and TFT V were reading at 3.9
which should be close to 0°C (32°F). The
single digit of precision in the gauges
does not provide a precise determination
of temperature.

You had several versions of “Baro” which
I couldn’t tell which pid it was using that
read around 14.1. There was another reading
13.3 which seemed unusually low.

A screenshot with min/max values from your
normal driving would be most appreciated.

Make sure your EBP psia, MAP psia and Baro
psia match +/- 0.5 before converting to gauge
pressure. Since boost is equal to MAP – Baro
which read 0.6 I would recommend you adjust
your EBP to match by changing the -6.6 for
the difference you are seeing (e.g., -3.4).

Note that after you subtract the baro value
from EBP psia the units will become psi.

m j

Member
Posts: 92

Re: Trans temp, IAT, and MAP
on: February 4, 2014 (GMT)

what info can I give you to work on throttle position formula?
would a log showing ‘A’ and ‘B’ for that PID help?

for MAP the freq reading went as high as 258 before it wrapped around to 0.

one of the Baro is outa wack. I was setting what I want to log and on the menu one was 14.6-14.7 and the other was 13.?
are both PID reading the same sensor or why is there two Baro?

Capp777

Member
Posts: 2993

Re: Trans temp, IAT, and MAP
on: February 4, 2014 (GMT)

I would use the baro that most
closely matches your phones baro
or your local weather reports.

MJ, I thought your baros on previous
postings were closer than the 14.1 and
13.3 on jschild’s screenshot.

Question for you…

Did you ever test 0149, 014A and 014B or
220049, 22004A and 22004B for responses?

A*(100/255) Thanks to MPD56 and his 6.7 for the equation.

The MAP Hz equation was calculated to match
the baro reading at the time. I am surprised it
was that close. If you change its slope to something
closer than you may need to change all the other
equations derived from it. (0.00391).

m j

Member
Posts: 92

Re: Trans temp, IAT, and MAP
on: February 4, 2014 (GMT)

I cannot tell what he has going on in post 106.
map freq is reading 110, so none of his MAP psi readings should be at 14.6 or 14.7 as the freq required for that is 111.
I tried to tell him as much but didnt get an answer as to what the various MAP gauges were reading.

next time I have the dash out I am going to find that Baro sensor.

for the accel pos yes 6400 is idle I cant recall what WOT is exactly but it is in the 50000 range. like I said I can log it full sweep.
I dunno if the tune can change that reading so we need a couple of guys to test it, I am using Gearhead tunes that apparently have a twitchy throttle.
which is kind of the reason I want a working accel pedal PID I feel like I have a dead spot off idle.

you are going to have to refresh my memory on what those PID you wanted tested are. I read back a few pages but didnt see them. I do see I still owe you some IATc values. we are getting a cold snap here this week. http://weather.gc.ca/city/pages/bc-81_metric_e.html

Capp777

Member
Posts: 2993

Re: Trans temp, IAT, and MAP
on: February 4, 2014 (GMT)

According to wiki they are
accelerator pedal positions
in percent.

His baro was reading 14.1 on
two gauges which seemed like
it would match the 110 Hz.

It seemed to me that your 221127
baro matched the phones baro
closer than the other pid. (Based
on your boost readings).

Jschild’s 221127 did not.

The unknown is what equations was
he using at the time of the screenshot.

Edit:

I have found some info that suggests
one of the baros may be reading in Hz.
Since 221127 seems to be in question
I believe it may be the Hz reading. Will
need to take another look at its equation.

jschildm

Member
Posts: 29

Re: Trans temp, IAT, and MAP
on: February 4, 2014 (GMT)

I will try and get some information today at operating temperature on my way home from work. At some point, although it might have to be tonight, I will make sure to let you know which gauge is which equation. I know the screen is too much to take in, but I wanted to make it easy for me to capture all of the data easily.

MJ – sorry for no response on PSN. I forgot you had asked about it and work has been a cluster here lately. I will do a better job of describing which gauge is which equation.

jschildm

Member
Posts: 29

Re: Trans temp, IAT, and MAP
on: February 5, 2014 (GMT)

Here is a screenshot from this morning on the way to work. I tried last night, but apparently my old cell phone I was using for this cant update all the PID’s and take a snapshot at the same time. I have updated the names on the gauges so they correspond to the equations posted above. I double checked all of them and the only difference between whats posted above and what I have entered is on IATc, it ended with +89.7 instead of 89.65 . Also, a couple of the metric units (kPa) were converted to psi, but it still gives a ball park. I can remove the units from those if you guys want so it doesn’t convert it.

We got some snow here so it was cold and slow going, which is why some of the temps stayed pretty low. Just let me know if there are questions on what I have posted.

https://dl.dropboxusercontent.com/u/50205548/screenshot.jpg

jschildm

Member
Posts: 29

Re: Trans temp, IAT, and MAP
on: February 5, 2014 (GMT)

Capp777

Member
Posts: 2993

Re: Trans temp, IAT, and MAP
on: February 5, 2014 (GMT)

FYI,

The linear equations for TFT will give readings
+/- 8 degrees (68% of the time). I would believe
the TFT poly as it will provide tighter readings.

It looks like you are still using the -6.6 offset for
your EBP. Your vehicle might need -4.1?

I have reason to believe that Baro27 may actually
be reporting Hz. (159 Hz at 14.7 psia sea level).
Assuming you guys arent at sea level that may
explain the lower readings that have been
posted.

Edit:

Changed boost alternate equation to try
to use 221442 instead.

jschildm

Member
Posts: 29

Re: Trans temp, IAT, and MAP
on: February 5, 2014 (GMT)

Quote from Capp777 on February 5, 2014
FYI,

The linear equations for TFT will give readings
+/- 8 degrees (68% of the time). I would believe
the TFT poly as it will provide tighter readings.

It looks like you are still using the -6.6 offset for
your EBP. Your vehicle might need -4.1?

I have reason to believe that Baro27 may actually
be reporting Hz. (159 Hz at 14.7 psia sea level).
Assuming you guys arent at sea level that may
explain the lower readings that have been
posted.

Edit:

Changed boost alternate equation to try
to use 221442 instead.

Its cold and I had to drive slow because people are afraid of snow, so sometime when it warms up, I can compare the TFT Poly to my mechanical gauge in the truck. The only thing I don’t know is where the gauge is for the ECM, compared to the location for the mechanical gauge (in the pan). Based on the old TFT temps, they were higher than my mechanical gauge (at least at ~120 F), but the Poly looks like it might be pretty close.

I have changed the offset to 4.1, so we will see what that does for the EBP. I also updated the Boost Alt to use 221442 now. Hopefully I can get some updates tonight, but no promises.

m j

Member
Posts: 92

Re: Trans temp, IAT, and MAP
on: February 6, 2014 (GMT)

KOEO pedal depressing from idle to WOT

acel pedal OBD
9.41
9.41
9.41
9.41
9.41
37.25
50.2
57.65
66.67
76.08
76.47
76.47
76.47
76.08
47.06
37.25
25.88
9.41
9.41
9.41
9.41
23.14
35.69
37.65
43.92
48.63
67.45
76.08
76.47
76.47
58.82
53.73
41.96
35.69
9.41
9.8
9.41
24.31
44.31
67.45
76.47
39.61
9.8
9.8
9.8
9.8
9.8
9.8
9.8
9.8
9.8
9.8
9.8

jschildm

Member
Posts: 29

Re: Trans temp, IAT, and MAP
on: February 6, 2014 (GMT)

mj – are you using AE to get these numbers, or data logging using torque?

m j

Member
Posts: 92

Re: Trans temp, IAT, and MAP
on: February 6, 2014 (GMT)

I dont have AE. that is torque with the last formula Capp gave me

jschildm

Member
Posts: 29

Re: Trans temp, IAT, and MAP
on: February 6, 2014 (GMT)

Quote from m j on February 6, 2014
I dont have AE. that is torque with the last formula Capp gave me

I can try and get mine I the next few days of you want to compare, since you think yours might be acting funny.

m j

Member
Posts: 92

Re: Trans temp, IAT, and MAP
on: February 6, 2014 (GMT)

that would be cool. I dont get 0-100% on the gauge, 9.41-76.47

my truck feels like it has a dead zone at tip in, and is twitchy at a low rpm cruise. it seems ok on the highway at 60mph

jschildm

Member
Posts: 29

Re: Trans temp, IAT, and MAP
on: February 7, 2014 (GMT)

Here is a shot with the updated EBP and Boost Alt equations (sorry for the poor quality, I had to take a picture of my old phone with my new one).

I will see if I can record some pedal input data this weekend.

Capp777

Member
Posts: 2993

Re: Trans temp, IAT, and MAP
on: February 7, 2014 (GMT)

Sorry guys… been having problems accessing the
forum with my phone. Trying from a laptop.

MJ:

Based on my readings your pedal should read
about .6V (12%) at idle and 4.35V (87%) at WOT.

Try…

(((A*256)+B)*0.00172)+0.66 or
(A*0.43860)+1.47

((A*256)+B)/11494 Volts?

Jschild:

Your EBP should read within +/- 0.5 at KOEO. Your latest
offset may still be off a little with KOEO. I realized
afterwards your screenshot was at idle. (-2.85)

Edit:

Adjusted IAT C Poly equation based upon latest screenshots.
(+149.5)

Edit2:

Adjusted TFT F Poly equation based upon latest screenshots.
(+259.5)

Edit3:

Corrected equations for pedal to 87%.

Adjusted Boost, MAP Freq, MAP kPa and MAP psia per MJs and Jschilds data.

cowmilker08

Member
Posts: 6

Re: Trans temp, IAT, and MAP
on: February 7, 2014 (GMT)

Hello, Everyone.

I just finished reading through the PSN thread and this thread. I want to say thanks for all of your efforts and that I’m ready to help where I can. I am not a user on PSN, but I might register soon. I have been a user on FTE for about 6 years.

I have a 96 F250 auto and a 97 F250 auto. I just started using Torque last week and am still learning how to use it. I am yet to program any custom PIDs.

Let me know if I can help with some of the math. I am a mechanical engineer so I can hold my own in the math department (except with hexidecimal #’s, lol). I am starting to get more interested in programming and electrical engineering. I have been playing with a few Arduino projects, but nothing major yet.

I hope to enter some custom PIDs tomorrow and do some testing. MJ, is your dropbox spreadsheet up to date? I think I can help with lower IAT temps and get you some more data points. It has been around -5°F at night this week.

Again, Thanks for all of your efforts getting this app to work on OBS 7.3. Its a huge $$$ saver.

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