turbo_bu
May 27th, 2015, 04:36 AM
Been looking at using the flex fuel OS to add timing for a dual fuel applications. The truck already has a propane conversion, but unfortunately, there isn't any method for adjusting the timing (other than using the stock gasoline timing). I already looked at using a COS, but this is a 1 MB PCM and doesn't have a COS 5. Also, COS 5 (nitrous) is limited in retarding timing, not advancing.
This brings me to flex fuel OS. One of the flex fuel tables is {B5947} Flex Fuel Spark table. "This table will alter the spark values when Ethanol fuel is being used."
This is a 3D table, but it is in the format of Airflow vs. RPM. My question is related to how much of those values are used based on the % of ethanol? Typically, there is a weighting table (2D) with multiple columns for varing %'s of ethanol. I didn't see it listed in the OS, but was wondering if anyone had played with this or not? My plan was to make a simple square wave function generator to simulate a given % of ethanol when the propane is activated. Was hoping somebody could provide some insight how this table was used.
This brings me to flex fuel OS. One of the flex fuel tables is {B5947} Flex Fuel Spark table. "This table will alter the spark values when Ethanol fuel is being used."
This is a 3D table, but it is in the format of Airflow vs. RPM. My question is related to how much of those values are used based on the % of ethanol? Typically, there is a weighting table (2D) with multiple columns for varing %'s of ethanol. I didn't see it listed in the OS, but was wondering if anyone had played with this or not? My plan was to make a simple square wave function generator to simulate a given % of ethanol when the propane is activated. Was hoping somebody could provide some insight how this table was used.