PID value for calculated MAT
05-17-2023, 06:21 PM
#1
Instructor
Thread Starter
PID value for calculated MAT
Does anyone know what the PID address and formula for the calculated MAT (manifold air temp) reading on these cars? The sort that can be inputted as a custom PID reading on torque app for example. Maybe someone that might have hptuners set up could probably read the properties from their preset chart PID list.
Like for example how ethanol % sensor reading is 22-0052 with formula (A/255)*100
Like for example how ethanol % sensor reading is 22-0052 with formula (A/255)*100
05-21-2023, 08:45 AM
#2
Moderator
Moved from C7 General discussion to C7 Tech/Performance.
05-22-2023, 03:34 AM
#3
Pro
Does anyone know what the PID address and formula for the calculated MAT (manifold air temp) reading on these cars? The sort that can be inputted as a custom PID reading on torque app for example. Maybe someone that might have hptuners set up could probably read the properties from their preset chart PID list.
Like for example how ethanol % sensor reading is 22-0052 with formula (A/255)*100
Like for example how ethanol % sensor reading is 22-0052 with formula (A/255)*100
160 PLUS which would retard the timing and make the car soggy when pulling away.
Kyle of "Goat Rope Garage" on Youtube explains how to write out the formulas for alot of calculated PIDs, and then how to log them, check him out if you haven't. He covers Gen 3, 4 and 5 (LT) tuning.
Last edited by d16dcoe45; 05-22-2023 at 03:39 AM.
06-01-2023, 03:02 AM
#4
Instructor
Thread Starter
You can log an IAT2 sensor, yes. But on the C7 the IAT means nothing in relation to timing. Timing is based on the MAT value, which is a calculated value from an equation using the IAT sensors and ECT (i think there was another sensor but I forget which one)
06-01-2023, 05:55 PM
#5
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Bill
06-03-2023, 12:44 AM
#6
Tech Contributor
Does anyone know what the PID address and formula for the calculated MAT (manifold air temp) reading on these cars? The sort that can be inputted as a custom PID reading on torque app for example. Maybe someone that might have hptuners set up could probably read the properties from their preset chart PID list.
Like for example how ethanol % sensor reading is 22-0052 with formula (A/255)*100
Like for example how ethanol % sensor reading is 22-0052 with formula (A/255)*100
11-30-2023, 09:33 AM
#7
Melting Slicks
Anymore info on this?
16 ZO6 in question. Trying to read boost from OBD2. (Dash logic) I have tried all the possible ways to calculate it, even their standard calculated boost. that's subtracts Baro from the manifold.
I have Verified the Car is reading the Baro correctly. Set a screen to show just the Baro reading. it changes with weather, altitude ect. For example right now its around 99kpa.
set a screen to show just the manifold pressure, and its showing it below that (In vacuum) but bring the car up to 0 reading on a mechanical boost gauge and its only reading 64ish. so that's still in vacuum, not = the cars current atmospheric pressure... It should be close to the outside Baro reading when 0 boost is reading on gauge.
SO there has to be some Math to correct the readying of this sensor or something. Dashlogic is working issue too, but they have not fixed it. If i know what the sensors is doing to come to the manifold absolute pressure, Then I can use that math, to fix the manifold pressure and then subtract the Baro and have an accurate boost reading.
Purposely stalled the car. Manifold Absolut pressure Reads 64kpa with motor off. while Baro is reading 99kpa.
around 5psi boost its reading 84 kpa. and 10 psi of boost it reads 108kpa... its not leanear.. even if I take the 64 KPA we know is atmospheric and subtract that form the manifold. it will be 0 boost reading. but at 5lbs of boost in real life it will read 84kpa-62kpa= 20 kpa which is only 2.9 psi what is the magical multiplier.
It maybe a problem with absolute manifold pressure vs absolute manifold pressure Hi res. does anyone know the difference or the math that is between the two?
16 ZO6 in question. Trying to read boost from OBD2. (Dash logic) I have tried all the possible ways to calculate it, even their standard calculated boost. that's subtracts Baro from the manifold.
I have Verified the Car is reading the Baro correctly. Set a screen to show just the Baro reading. it changes with weather, altitude ect. For example right now its around 99kpa.
set a screen to show just the manifold pressure, and its showing it below that (In vacuum) but bring the car up to 0 reading on a mechanical boost gauge and its only reading 64ish. so that's still in vacuum, not = the cars current atmospheric pressure... It should be close to the outside Baro reading when 0 boost is reading on gauge.
SO there has to be some Math to correct the readying of this sensor or something. Dashlogic is working issue too, but they have not fixed it. If i know what the sensors is doing to come to the manifold absolute pressure, Then I can use that math, to fix the manifold pressure and then subtract the Baro and have an accurate boost reading.
Purposely stalled the car. Manifold Absolut pressure Reads 64kpa with motor off. while Baro is reading 99kpa.
around 5psi boost its reading 84 kpa. and 10 psi of boost it reads 108kpa... its not leanear.. even if I take the 64 KPA we know is atmospheric and subtract that form the manifold. it will be 0 boost reading. but at 5lbs of boost in real life it will read 84kpa-62kpa= 20 kpa which is only 2.9 psi what is the magical multiplier.
It maybe a problem with absolute manifold pressure vs absolute manifold pressure Hi res. does anyone know the difference or the math that is between the two?
Last edited by mittens; 11-30-2023 at 05:30 PM.
12-03-2023, 05:21 PM
#8
Anymore info on this?
16 ZO6 in question. Trying to read boost from OBD2. (Dash logic) I have tried all the possible ways to calculate it, even their standard calculated boost. that's subtracts Baro from the manifold.
I have Verified the Car is reading the Baro correctly. Set a screen to show just the Baro reading. it changes with weather, altitude ect. For example right now its around 99kpa.
set a screen to show just the manifold pressure, and its showing it below that (In vacuum) but bring the car up to 0 reading on a mechanical boost gauge and its only reading 64ish. so that's still in vacuum, not = the cars current atmospheric pressure... It should be close to the outside Baro reading when 0 boost is reading on gauge.
SO there has to be some Math to correct the readying of this sensor or something. Dashlogic is working issue too, but they have not fixed it. If i know what the sensors is doing to come to the manifold absolute pressure, Then I can use that math, to fix the manifold pressure and then subtract the Baro and have an accurate boost reading.
Purposely stalled the car. Manifold Absolut pressure Reads 64kpa with motor off. while Baro is reading 99kpa.
around 5psi boost its reading 84 kpa. and 10 psi of boost it reads 108kpa... its not leanear.. even if I take the 64 KPA we know is atmospheric and subtract that form the manifold. it will be 0 boost reading. but at 5lbs of boost in real life it will read 84kpa-62kpa= 20 kpa which is only 2.9 psi what is the magical multiplier.
It maybe a problem with absolute manifold pressure vs absolute manifold pressure Hi res. does anyone know the difference or the math that is between the two?
16 ZO6 in question. Trying to read boost from OBD2. (Dash logic) I have tried all the possible ways to calculate it, even their standard calculated boost. that's subtracts Baro from the manifold.
I have Verified the Car is reading the Baro correctly. Set a screen to show just the Baro reading. it changes with weather, altitude ect. For example right now its around 99kpa.
set a screen to show just the manifold pressure, and its showing it below that (In vacuum) but bring the car up to 0 reading on a mechanical boost gauge and its only reading 64ish. so that's still in vacuum, not = the cars current atmospheric pressure... It should be close to the outside Baro reading when 0 boost is reading on gauge.
SO there has to be some Math to correct the readying of this sensor or something. Dashlogic is working issue too, but they have not fixed it. If i know what the sensors is doing to come to the manifold absolute pressure, Then I can use that math, to fix the manifold pressure and then subtract the Baro and have an accurate boost reading.
Purposely stalled the car. Manifold Absolut pressure Reads 64kpa with motor off. while Baro is reading 99kpa.
around 5psi boost its reading 84 kpa. and 10 psi of boost it reads 108kpa... its not leanear.. even if I take the 64 KPA we know is atmospheric and subtract that form the manifold. it will be 0 boost reading. but at 5lbs of boost in real life it will read 84kpa-62kpa= 20 kpa which is only 2.9 psi what is the magical multiplier.
It maybe a problem with absolute manifold pressure vs absolute manifold pressure Hi res. does anyone know the difference or the math that is between the two?
12-04-2023, 10:10 AM
#9
Melting Slicks
I have used dashlogic on last 3-4 vetts I have had. All reading boost, and manifold temps? This is the only one I have had this issue on. First LT4