MAF Support
Moderators: jsmcortina, muythaibxr
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- Helpful MS/Extra'er
- Posts: 134
- Joined: Thu Sep 01, 2005 8:33 am
MAF Support
Is there plans for MAF support in MS2 Extra? I haven't been able to find any documentation or information about this feature. I'm sure someone has asked before but the search function kind of sucks and I am never able to find anything that I am looking for.
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- Site Admin
- Posts: 8230
- Joined: Thu Oct 14, 2004 12:48 pm
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- Helpful MS/Extra'er
- Posts: 134
- Joined: Thu Sep 01, 2005 8:33 am
-
- Site Admin
- Posts: 8230
- Joined: Thu Oct 14, 2004 12:48 pm
-
- Helpful MS/Extra'er
- Posts: 134
- Joined: Thu Sep 01, 2005 8:33 am
MAF on a "hobby" car
The one really good reason to use MAF is that it measures ACTUAL intake air mass, not a derived quantity thru MAP and known intake tract behavior.
This MAF predictability is great for volume cars that shall run and run for 10-20 years with no, or not much, tweaking. The MAF will always give a true air mass signal, no matter how much the intake tract flow changes. Worn camshaft, sooty valves, clogged air filter etc is no "problem". Base fuelling will be right.
One very unloved aspect of the "hot film" or "hot wire " MAF is that it is quite prone to measuring errors. After 50 km it is not at all unusual to have to replace the MAF sensor, which is quite expensive. There are quite a few reasons for this, but the most common seems to be silicone oil contamination. The silicone oil is not burned off by the standard cleaning cycle used.
So, for me a MAP sensor seems perfectly adequate in our type of installs, and it is also quite a bit less expensive and absolutely trouble free to install.
I have just helped friends with diagnosing erratic starts and running on a BMW 5 series and a MB 420. Both traced to MAF sensors. We tried to use a special silicon cleaner, but no real success. After just a couple of days performance was back to precleaning, measuring only about 1/3rd of the actual air mass.
The BMW , being a 02 M5 set us back with 2 MAFs, but what a car!!!
So, I recommend that MS sticks with MAP as base with MAF as a possible alternative.
W113
This MAF predictability is great for volume cars that shall run and run for 10-20 years with no, or not much, tweaking. The MAF will always give a true air mass signal, no matter how much the intake tract flow changes. Worn camshaft, sooty valves, clogged air filter etc is no "problem". Base fuelling will be right.
One very unloved aspect of the "hot film" or "hot wire " MAF is that it is quite prone to measuring errors. After 50 km it is not at all unusual to have to replace the MAF sensor, which is quite expensive. There are quite a few reasons for this, but the most common seems to be silicone oil contamination. The silicone oil is not burned off by the standard cleaning cycle used.
So, for me a MAP sensor seems perfectly adequate in our type of installs, and it is also quite a bit less expensive and absolutely trouble free to install.
I have just helped friends with diagnosing erratic starts and running on a BMW 5 series and a MB 420. Both traced to MAF sensors. We tried to use a special silicon cleaner, but no real success. After just a couple of days performance was back to precleaning, measuring only about 1/3rd of the actual air mass.
The BMW , being a 02 M5 set us back with 2 MAFs, but what a car!!!
So, I recommend that MS sticks with MAP as base with MAF as a possible alternative.
W113
If not understood , it will not work
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- Helpful MS/Extra'er
- Posts: 134
- Joined: Thu Sep 01, 2005 8:33 am