Omni 4bar map sensor Plug and Play
Mar 27, 2009, 01:32 PM
#107
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Join Date: Feb 2008
Location: socal
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We get that a lot, although not many people actually need a 7bar map sensor we did install one on a normally aspirated acura integra for about 1 month. we logged fuel mileage before and after with no significant changes noticed or any difference in the way the engine performed. Frankly it would be much easier to just have 1 model 7 bar to fit everything but most have drawn a conclusion that there is some giant and significant "resolution difference" . The ecu is ultra sensative to voltage changes in the smallest of increments so it can precisely calculate the fuel and spark at each engine rpm and map pressure/vacuum.
Mar 27, 2009, 10:45 PM
#108
7bar, that depends on the resolution of the ADCs and not the sensor though. Problems with larger MPA sesnors also shows up with large injectors on little motors trying to idle below 1000 RPM.
The EVO is currently an 8-bit ADC (for data logging) which makes for 2.745 kPa (0.398 PSI) resolution on a 7bar MAP sensor. Fine for data logging, probably a little coarse for engine management.
It can do higher resolution though.
The EVO is currently an 8-bit ADC (for data logging) which makes for 2.745 kPa (0.398 PSI) resolution on a 7bar MAP sensor. Fine for data logging, probably a little coarse for engine management.
It can do higher resolution though.
Mar 30, 2009, 05:17 AM
#112
The ECU supplies 5V to the sensor and it is grounded. The output is proportional to manifold absolute pressure (+- an offset if the sensor has one). The table in question is scaling that value (in a non-linear fashion) to form part of the lift off MAF limiting code.
My SD conversion uses a table (MAP sensor VE and calibration) that takes a raw ADC input and spits out the load that that should represent. We make the table user friendly in Ecuflash by applying a scaling to change the raw ADC input into MAP (kPa).
(There is another table that corrects for RPM as well).
My SD conversion uses a table (MAP sensor VE and calibration) that takes a raw ADC input and spits out the load that that should represent. We make the table user friendly in Ecuflash by applying a scaling to change the raw ADC input into MAP (kPa).
(There is another table that corrects for RPM as well).
Apr 25, 2009, 11:49 AM
#115
Not to reserect yet another dead thread, but, i am currently looking at the same Omni specimen.
http://cgi.ebay.com/ebaymotors/ws/eB...3AIT&viewitem=
Same find here now that it is April, almost may. I was looking at this, did we ever find out what exactly needed to be done to the Stock ECU I am running, to get this thing to read.
Running a Cobb Stage 2 tune currently, with supporting mods.
Any help appreciated. Thanks again.
http://cgi.ebay.com/ebaymotors/ws/eB...3AIT&viewitem=
Same find here now that it is April, almost may. I was looking at this, did we ever find out what exactly needed to be done to the Stock ECU I am running, to get this thing to read.
Running a Cobb Stage 2 tune currently, with supporting mods.
Any help appreciated. Thanks again.
May 22, 2009, 03:38 PM
#117
I have spent yesterday and most of today playing with the scaling on my new 4bar. I want to make sure its 100% dialed before I go to solely ECU speed density (right now using a piggyback for the SD conversion). So far so good but realistically as long as the voltage scale matches set points on the 0-255 it will always be good. The boost logging with the 0.238683 variable is also accurate versus my boost gauge which hasnt lied to me with the JDM 3 bar.
Order them up. In fact they are a stocking item I carry now and I am willing to organize a group buy, but I will post that in another thread to not clog this one with that stuff. Give me the rest of weekend and I will put up all my data
Aaron
Order them up. In fact they are a stocking item I carry now and I am willing to organize a group buy, but I will post that in another thread to not clog this one with that stuff. Give me the rest of weekend and I will put up all my data
Aaron
May 22, 2009, 03:49 PM
#118
When you use the ECU directly you have 10 bit resolution (0-1023) internally and with my SD (and mrfred's US ECU conversions). I think resolution at idle is probably better than MAF, certainly sounds smoother.
May 26, 2009, 05:35 AM
#119
I have spent yesterday and most of today playing with the scaling on my new 4bar. I want to make sure its 100% dialed before I go to solely ECU speed density (right now using a piggyback for the SD conversion). So far so good but realistically as long as the voltage scale matches set points on the 0-255 it will always be good. The boost logging with the 0.238683 variable is also accurate versus my boost gauge which hasnt lied to me with the JDM 3 bar.
Order them up. In fact they are a stocking item I carry now and I am willing to organize a group buy, but I will post that in another thread to not clog this one with that stuff. Give me the rest of weekend and I will put up all my data
Aaron
Order them up. In fact they are a stocking item I carry now and I am willing to organize a group buy, but I will post that in another thread to not clog this one with that stuff. Give me the rest of weekend and I will put up all my data
Aaron
