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Author Topic: Trans temp, IAT, and MAP
Capp777
Member
Posts: 2917
 Re: Trans temp, IAT, and MAPon: January 4, 2014 (GMT)

I am not asking you to peg anything. I was just
curious what the car gauge displays were registering
while you drove normal. I would think the other app
provides a logging feature to capture the data.

I would think your turbo would produce consistent
pressure at the same rpms while driving under the
same conditions.

Since Boost = Map – Baro … should be able to figure
the Map pressure from your display at given rpm. At
the Hz reading while it was at 25?

Using this info then tweek the multiplier (span) in the
Torque pid equation to yield similar results.

The same goes with MAP Hz.

If all goes well, you should have three new pids: MAP,
MAP Hz and Boost when this is done.

Thank you for trying the other pids. This information
will ultimately help other 7.3 owners like yourself.

As for me, I drive an obdi jeep MY1995 which cannot use
Torque. (Have to borrow family and friends vehicles to
test).

Since you are getting an IAT reading in volts… you may
be able to scale it to read °F. I think this is what the
original poster was trying to achieve.

Try ((A*256)+B)/13107 for volts.

Noting its hex value at ambient and at temperature with the
engine warmed up should help with that.

Thanks again.

Capp777
Member
Posts: 2917
 Re: Trans temp, IAT, and MAPon: January 4, 2014 (GMT)

Based upon the info so far…

MAP
Mode/Pid: 221452
Equation: ((A*256)+B)*0.000519
Units: psia

MAP
Mode/Pid: 221452
Equation: ((A*256)+B)*0.00395
Units: Hz

Boost
Mode/Pid: 221452
Equation: (((A*256)+B)*0.000519)-Baro()
Units: psi

MAP
Mode/Pid: 221452
Equation: ((A*256)+B)*0.003578
Units: kPa

IAT V
Mode/Pid: 22114A
Equation: ((A*256)+B)/13107
Units: Volts

TFT V (Still needs to be tested for response)
Mode/Pid: 2211BD
Equation: ((A*256)+B)/11099
Units: Volts

If you use a digital display type you can
set the number of decimals displayed by…

Long press the display > Display Configuration…
swipe list to see the end then select change
number of decimal places.

Edit:

pids as the list is a work in progress. Latest
list will be found near end of the thread.

m j
Member
Posts: 92
 Re: Trans temp, IAT, and MAPon: January 5, 2014 (GMT)

IAT is finding something

scaling is off on the MAP but it does respond to boost

m j
Member
Posts: 92
 Re: Trans temp, IAT, and MAPon: January 5, 2014 (GMT)

“At what rpm does your boost read 25 psi and what was
the Hz reading while it was at 25?”

this is a foolish question to ask. I can get 25psi at any rpm from 1500-4000rpm as turbo has no relation to RPM at all, it responds to LOAD.
and once it is under load getting it to stop at 25psi is not something I can master.
currently the game is ‘try and keep the turbo that wants to race up to 50# under 35# so it doesnt go outside the range of the MAP sensor’
all this while trying to keep it on the road and not run over traffic

I will try the formula you posted and report the results.
I am very grateful for the efforts you have put in to this.
sorry I do not have the tools with me to properly test the sensors.

when I get back home I might be able to use my air compressor ,a pair of guages, and regulator to feed controlled amounts of pressure to the sensor.

m j
Member
Posts: 92
 Re: Trans temp, IAT, and MAPon: January 5, 2014 (GMT)

I will have to test for a working BARO.
is that phone BARO or from the PCM??

Capp777
Member
Posts: 2917
 Re: Trans temp, IAT, and MAPon: January 5, 2014 (GMT)

As I dont own a vehicle with a turbo… I do not
understand the particulars of how it operates
in regards to the throttle.

Hopefully you will post up any needed corrections
but the listing will give others something to work
with until that time.

Stupid questions or not… at least I got you this
far.

Baro() could be either. Torque chooses the best
source since some vehicles do not return [33].

MAP should match Baro at KOEO. Your screenshots
only show at idle.

m j
Member
Posts: 92
 Re: Trans temp, IAT, and MAPon: January 5, 2014 (GMT)

this is KOEO with your formula in the presented gauges. will make a few more and see if I can jam all yours on the screen
the EBP is way off I need to look at what I have in there too I guess

ambient is near freezing, local airport says 0°Celcius

m j
Member
Posts: 92
 Re: Trans temp, IAT, and MAPon: January 5, 2014 (GMT)

cold KOEO
I am getting a P0470 EBP sensor code so maybe the sensor is dead
ebp formula ((a*256)+b)*(36.25/1000)
IAT sensor is suspect as well as it has had a hard life it is dangling from its wires on the inner fender

Capp777
Member
Posts: 2917
 Re: Trans temp, IAT, and MAPon: January 5, 2014 (GMT)

If the new circular MAP gauge is in kPa
the min/max values will need to be adjusted.

Interesting that the IAT sensor was hanging
and you were still able to operate the
engine.

m j
Member
Posts: 92
 Re: Trans temp, IAT, and MAPon: January 6, 2014 (GMT)

IAT does very little on these engines from what I can tell.

Capp777
Member
Posts: 2917
 Re: Trans temp, IAT, and MAPon: January 6, 2014 (GMT)

I would think its used by the pcm along
with other sensors to calculate accurate air
flow, air density and fuel delivery.

Edit:

It looks like your EBP value is off by 6.3.

Not sure but I think it should be equal
to MAP psia and Baro psia at KOEO., ~19
at 1700 rpm and ~28 at 3000 rpm based
upon what I’ve read so far.

Did you pressurize the EBP to get 21 psia
at KOEO? It was reading 7 at idle in previous
screenshots.

P0470 Exhaust Back Pressure Sensor Malfunction
according to my manuals.

m j
Member
Posts: 92
 Re: Trans temp, IAT, and MAPon: January 7, 2014 (GMT)

I had a -14.7 in the formula before. took it out.
there are too many variables to say EBP is going to be a certain # at an rpm.

I have to check the MAP psia as that gauge is not functioning, neither is baro.

the scale is off on the boost guage it reads far lower then my Autometer boost gauge. sorry for the nice vagueness of that.
can you work on formula using the map HZ:psi expected readings in the first post?

Capp777
Member
Posts: 2917
 Re: Trans temp, IAT, and MAPon: January 7, 2014 (GMT)

If Hz was correct or Boost was correct… should
be able to work it out. Problem is the spans for
both are probably not correct based upon your
findings for Torque.

We know your hex data for KOEO but are still
missing the second data point at the high end.

You say your engine stumbles at at certain boost
which then becomes strange numbers. Have you
figured what the equivalent is for Torque?

Are you certain increasing throttle at a stand still
wont increase boost without a load independant
of turbo spinning. Again I dont know how your
turbo is controlled… just looking for a consistent
change in boost which will give a second point
of reference just maybe not as much boost or Hz
as when the turbo is spinning.

As far as baro… create a custom pid using your
phone’s barometer. Use [ff1270] baro as listed in
Torquescan.

m j
Member
Posts: 92
 Re: Trans temp, IAT, and MAPon: January 7, 2014 (GMT)

no load is no boost on anything turbo.

my turbo has no ‘controls’ no wastegate, no blowoff valves
the only control is how much fuel I pour in to the cylinders
stock injector were 96cc, mine are 350cc/200% oversize nozzles

I guess I need to learn to log with this phone so you can watch the HZ and boost on cargaugepro, the translate it in to torque

Capp777
Member
Posts: 2917
 Re: Trans temp, IAT, and MAPon: January 7, 2014 (GMT)

Nice pic.

Since you say that rpm is not consistent when making
boost/Hz it may not translate directly back to Torque.

Problem is a lack of a repeatable way for reading pressure/Hz
from both apps under same conditions.

m j
Member
Posts: 92
 Re: Trans temp, IAT, and MAPon: January 7, 2014 (GMT)

conditions dont matter. sensor turns a pressure in to a frequency. i think i can use the track plug in to record video of autometer gauge while torque boost gauge is displayed.

Capp777
Member
Posts: 2917
 Re: Trans temp, IAT, and MAPon: January 7, 2014 (GMT)

I would think that only one app at a time

MPD56
Member
Posts: 275
 Re: Trans temp, IAT, and MAPon: January 7, 2014 (GMT)

MJ: Nice looking motor.

I‘ve be working on tweaking the boost gauge for the 6.7L. Although I use the half dial gauge because it registers the high and low values, I find that the graph display is good to watch in real time.

http://www.forddoctorsdts.com/coffee_table_books.html

m j
Member
Posts: 92
 Re: Trans temp, IAT, and MAPon: January 8, 2014 (GMT)

this one shows some data for the formula correction I think
max of 213hz should have shown over 40psia but nothing over 30 on the gauges. I will change to ones that show min/max

m j
Member
Posts: 92
 Re: Trans temp, IAT, and MAPon: January 8, 2014 (GMT)

I have no idea what I am doing. so I graph the numbers given in the first post for HZ:psi, looks linear at first but when I do the math the slope goes from .275 to .279.
so now I have to youtube how to make a function from a curve or do we pick a linear fn and run with it as we do not know if the first post numbers are spot on

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