map sensor question
map sensor question heres my question, im doing a turbo 5.3 looking to run a 3 bar msd map sensor gm style. my question is when I get my comp flashed from psi is this something he tells the comp that it now hows a 3 bar map sensor, or is it something my tuner can do threw HPT's.. psi is doing my harness and comp start up flash. also not sure if this matters but I will still be running a MAF.
thanks
thanks
Teching In
Joined: Sep 2012
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You will have Map scalars that will need to be adjusted in your software to tell your pcm that you now have a 3bar. Depending on ecu (such as 0411) you could just run Speed Density and get rid of the maf if you wish.
Or you can Force maf (hoping you have a big enough maf) and not need to change from the one bar map sense it will not be used. LS7 slotted maf is a popular choice and can be scaled appropriately for the ecm you are using. Since you have the 3 bar i would still install it as its good to have a working map sensor if a maf ever fails.
Or you can Force maf (hoping you have a big enough maf) and not need to change from the one bar map sense it will not be used. LS7 slotted maf is a popular choice and can be scaled appropriately for the ecm you are using. Since you have the 3 bar i would still install it as its good to have a working map sensor if a maf ever fails.
In the tune file, where are these MAP Scalars?
I'm not finding them.
Ok, answered my own question.
Engine Diagnostics/Airflow/Map Sensor
Ron
I'm not finding them.
Ok, answered my own question.
Engine Diagnostics/Airflow/Map Sensor
Ron
Last edited by RonSSNova; Jan 5, 2014 at 01:57 AM.
you will have to apply a 3bar OS to the stock file
and then the MAP will be scaled accordingly
you may have to adjust the map linear/offset values in the Engine Diagnostics/Airflow/Map Sensor
and then the MAP will be scaled accordingly
you may have to adjust the map linear/offset values in the Engine Diagnostics/Airflow/Map Sensor
you will do it thru HP tuners if PSI doesnt do it for you already
likely, PSI is either using HP Tuners or EFI live and adding a custom OS to your ECU already
you should talk to them and find out for certain what they are doing for your 3 bar MAP...ask for details...
if they arent putting in a 3 bar OS, then dont use them for tuning.
likely, PSI is either using HP Tuners or EFI live and adding a custom OS to your ECU already
you should talk to them and find out for certain what they are doing for your 3 bar MAP...ask for details...
if they arent putting in a 3 bar OS, then dont use them for tuning.
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Launching!
Joined: Jan 2012
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From: Davisburg, MI
If the harness supplier flashes in a 3 bar OS with EFI-L, you won't be able to tune it with HPT. If they do use HPT, make sure they are not locking the tune if someone else is to tune it afterwards.
Teching In
Joined: Sep 2012
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This wont be necessary if he is running say a E38 or any other VVE ecm's. Thus he hasnt stated the ecm he is using. The VVE ecms already have tables for 1,2,3 bar and just need the map sensor scaled correctly.
As i stated above if he is running a 0411 then he should do (if he wants to), a COS and run full speed density. But it is dependent on the ecm and the tuner. MAF tunes are also good and do not need an upgraded sensor you just lower the maf switch point, or force the maf entirely (dependent on if the maf is big enough to support boost).
Teching In
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I recommend you talk to your tuner and see if he feels comfortable about doing a speed density tune and getting rid of the maf.
Teching In
Joined: Sep 2012
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Ok a little more in depth. you can physically remove the maf but you will need to replace it with an IAT sensor. Or you can leave the maf disable it in the software and use the IAT still built in. Typically with a blow off valve and a working maf you should not let the bov vent to atmosphere.
Running speed density the tuner will tune the map sensors cells for the volume-metric efficiency (fuel) table, and ignition tables. the ecm will use rpm, tps, ect, iat, and baro and fuel trims for compensations for weather and altitude changes.
Both maf or speed density tuning will allow the car to properly be calibrated. There are ups and downs to both but nothing drastic to sway an opinion. I personally like speed density tuning and you see most people with high end stand alone and big turbo cars such as Big Stuff 3, Holley, F.A.S.T., etc are using Map (speed density) tuning. But on the gen 4 ecms with VVE tables I strictly tune the maf cause those can be a real pain.
Running speed density the tuner will tune the map sensors cells for the volume-metric efficiency (fuel) table, and ignition tables. the ecm will use rpm, tps, ect, iat, and baro and fuel trims for compensations for weather and altitude changes.
Both maf or speed density tuning will allow the car to properly be calibrated. There are ups and downs to both but nothing drastic to sway an opinion. I personally like speed density tuning and you see most people with high end stand alone and big turbo cars such as Big Stuff 3, Holley, F.A.S.T., etc are using Map (speed density) tuning. But on the gen 4 ecms with VVE tables I strictly tune the maf cause those can be a real pain.
