maffrequencylimits
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maffrequencylimits [2009/07/20 07:57] twdorris |
maffrequencylimits [2009/07/20 07:59] twdorris |
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| A stock, unhacked 1G DSM MAS will not accurately report frequencies above 2000hz. That frequency represents roughly 180 lps (380 cfm) of volumetric airflow. At standard temperature (around 77F) and sealevel pressure, that's about 210 gm/sec (28 lb/min) of mass airflow. | A stock, unhacked 1G DSM MAS will not accurately report frequencies above 2000hz. That frequency represents roughly 180 lps (380 cfm) of volumetric airflow. At standard temperature (around 77F) and sealevel pressure, that's about 210 gm/sec (28 lb/min) of mass airflow. | ||
| - | ==== 2G DSM MAF ==== | ||
| - | A stock, unhacked 2G DSM MAF (same as the 3000GT VR4 MAF) was designed to operate a bit higher. You'd expect overflow on a 2G DSM MAF around 2700hz. That frequency represents roughly 320 lps (about 680 cfm) of volumetric airflow. At standard temperature (around 77F) and sealevel pressure, that's about 375 gm/sec (50 lb/min) of mass airflow. | + | ==== 2G DSM MAS ==== |
| + | A stock, unhacked 2G DSM MAS (same as the 3000GT VR4 MAS, same as an Lancer EVO1-3 MAS) was designed to operate a bit higher. You'd expect overflow on a 2G DSM MAS around 2700hz. That frequency represents roughly 320 lps (about 680 cfm) of volumetric airflow. At standard temperature (around 77F) and sealevel pressure, that's about 375 gm/sec (50 lb/min) of mass airflow. | ||
| - | ==== EVO8 MAF ==== | ||
| - | A stock, unhacked EVO8 MAF (effectively the same as the 3G Eclipse MAF) was designed to operate even higher! You'd expect overflow on EVO8 MAF around 3000hz (we think...I'm not sure I've actually seen an EVO8 MAF overrun). That frequency represents roughly 420 lps (about 890 cfm) of volumetric airflow. At standard temperature (around 77F) and sealevel pressure, that's about 500 gm/sec (66 lb/min) of mass airflow. | + | |
| + | ==== EVO8 MAS ==== | ||
| + | |||
| + | A stock, unhacked EVO8 MAS (effectively the same as the 3G Eclipse MAS) was designed to operate even higher! You'd expect overflow on EVO8 MAS around 3000hz (we think...I'm not sure I've actually seen an EVO8 MAS overrun). That frequency represents roughly 420 lps (about 890 cfm) of volumetric airflow. At standard temperature (around 77F) and sealevel pressure, that's about 500 gm/sec (66 lb/min) of mass airflow. | ||
| ==== Summary ==== | ==== Summary ==== | ||
| - | ^MAF ^ Freq limit ^ Volumetric limit ^ Mass limit ^ | + | ^MAS ^ Freq limit ^ Volumetric limit ^ Mass limit ^ |
| |1G DSM | 2000hz|180 lps (380 cfm) |210 gm/sec (28 lb/min) | | |1G DSM | 2000hz|180 lps (380 cfm) |210 gm/sec (28 lb/min) | | ||
| |2G DSM | 2700hz|320 lps (680 cfm) |375 gm/sec (50 lb/min) | | |2G DSM | 2700hz|320 lps (680 cfm) |375 gm/sec (50 lb/min) | | ||
| |EVO8 | 3000hz|420 lps (890 cfm) |500 gm/sec (66 lb/min) | | |EVO8 | 3000hz|420 lps (890 cfm) |500 gm/sec (66 lb/min) | | ||
| - | When running one of these MAFs anywhere near these limits, use ECMLink's MAF Clamp function. Read the help files and forums for more information. By using this function properly, you can effectively remove the upper airflow limitation of these MAF sensors. Even so, it's highly recommended that the 1G DSM MAF not be used simply because its limit is too low to produce reliable MAF Clamp operation when running substantially more airflow than the sensor was designed to meter. | + | When running one of these MAF sensors anywhere near these limits, use ECMLink's MAFClamp function. Read the help files and forums for more information. By using this function properly, you can effectively remove the upper airflow limitation of these MAF sensors. Even so, it's highly recommended that the 1G DSM MAF not be used simply because its limit is too low to produce reliable MAFClamp operation when running substantially more airflow than the sensor was designed to meter. |
maffrequencylimits.txt · Last modified: 2024/03/15 11:16 (external edit)
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