Joseph Davis
New Member
Hi!
I'd like to construct a frequency to frequency converter for use in running GM 3" or 3.5" mass air flow meters on 90-94 DSM/Mitsubishis. There has been some discussion of doing this (by another route) on the dsm-ecu yahoogroups mailing list; apparently the GM MAF is compatible with the DSM ECU hardware, but it puts out a frequency four times greater than the stock DSM MAF. The proposed solution on dsm-ecu mailing list is to divide the GM MAF's frequency input by 4 on the code level, but without adequate dasm tools things aren't progressing quickly enough for my liking.
That, and I'm bored.
I don't see any reason why running a freq-to-volt converter into a volt-freq converter wouldn't work, but I'm wondering if there isn't a component out there that would do the job for me more simply. If I can get the signal scaled down to the correct range, it's simply a matter of plotting the MAF curve compared to the stock unit, kicking the ECU's MAF table a little, and verifying my work with wideband oxygen sensor + datalogs.
I've had a little past basic electronics in school, but it's been a while. What I'm angling for are hints, leads, harsh criticism, and datasheets. I go bang my head against them for a while with the help of my old textbooks on the shelf, then come back and ask stupid questions like a good little n00b.
Thanks!
I'd like to construct a frequency to frequency converter for use in running GM 3" or 3.5" mass air flow meters on 90-94 DSM/Mitsubishis. There has been some discussion of doing this (by another route) on the dsm-ecu yahoogroups mailing list; apparently the GM MAF is compatible with the DSM ECU hardware, but it puts out a frequency four times greater than the stock DSM MAF. The proposed solution on dsm-ecu mailing list is to divide the GM MAF's frequency input by 4 on the code level, but without adequate dasm tools things aren't progressing quickly enough for my liking.
That, and I'm bored.
I don't see any reason why running a freq-to-volt converter into a volt-freq converter wouldn't work, but I'm wondering if there isn't a component out there that would do the job for me more simply. If I can get the signal scaled down to the correct range, it's simply a matter of plotting the MAF curve compared to the stock unit, kicking the ECU's MAF table a little, and verifying my work with wideband oxygen sensor + datalogs.
I've had a little past basic electronics in school, but it's been a while. What I'm angling for are hints, leads, harsh criticism, and datasheets. I go bang my head against them for a while with the help of my old textbooks on the shelf, then come back and ask stupid questions like a good little n00b.
Thanks!