2byte airflow limit?
Thread Starter
Joined: Aug 2003
Posts: 14,092
Likes: 1,090
From: Mid-Hudson, NY
2byte airflow limit?
Sorry I searched and couldn't find specifics, or I didn't search well.
Either way...
Anyone know the Hz limit on the stock MAF? Hit 3200hz on a car today and I would like to know how little/much headroom it still has.
Either way...
Anyone know the Hz limit on the stock MAF? Hit 3200hz on a car today and I would like to know how little/much headroom it still has.
Thread Starter
Joined: Aug 2003
Posts: 14,092
Likes: 1,090
From: Mid-Hudson, NY
Thread Starter
Joined: Aug 2003
Posts: 14,092
Likes: 1,090
From: Mid-Hudson, NY
I think you will get to a functional limit before you ever get to an ecu limit. Let me search through the DSMLink forums to see what numbers those guys are getting on the Evo MAF. When I used to frequent that board years ago, there were plenty of people maxing out the stock 2g MAF and had datalogs to show it.
From what I remember, the signal would just become very unstable and choppy and start causing erratic airflow readings. That's why DSMLink implemented a 'fake maf' code which basically was a speed density system after a certain maf hz value, which was then controlled via a VE table.
From what I remember, the signal would just become very unstable and choppy and start causing erratic airflow readings. That's why DSMLink implemented a 'fake maf' code which basically was a speed density system after a certain maf hz value, which was then controlled via a VE table.
Wow that is a gorgeous dyno chart.
I am with l1r99gst. you will most likely hit the physical limit of the MAF. You may want to talk to Mellon, i know he is has a lot of experience in this area.
I am with l1r99gst. you will most likely hit the physical limit of the MAF. You may want to talk to Mellon, i know he is has a lot of experience in this area.
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Bryan,
I couldn't find too much info on the DSMLink board anymore. Most guys that are still using Mitsu Mafs use the maf clamp feature within DSMLink.
What I gathered was that the 2G Maf start missing/dropping counts somewhere around the 3000Hz mark. The Evo Maf, I would assume, should be in the same neighborhood, maybe somewhat higher.
From what I read, the way to tell is just to look at your datalog and notice any places where the MAF reading seems to drop a bit, then come back up. It will start to do this more and more, until it drops a lot, then comes back.
Either way, I would think you are close to the max stable readings, but that's just a guess. Just keep an eye on the Hz readings and AFR readings.
I couldn't find too much info on the DSMLink board anymore. Most guys that are still using Mitsu Mafs use the maf clamp feature within DSMLink.
What I gathered was that the 2G Maf start missing/dropping counts somewhere around the 3000Hz mark. The Evo Maf, I would assume, should be in the same neighborhood, maybe somewhat higher.
From what I read, the way to tell is just to look at your datalog and notice any places where the MAF reading seems to drop a bit, then come back up. It will start to do this more and more, until it drops a lot, then comes back.
Either way, I would think you are close to the max stable readings, but that's just a guess. Just keep an eye on the Hz readings and AFR readings.
3rd gear pull
https://www.evolutionm.net/forums/ev...-e85-army.html
https://www.evolutionm.net/forums/ev...-e85-army.html
