Miata Turbo Forum - Boost cars, acquire cats.

Miata Turbo Forum - Boost cars, acquire cats. (https://www.miataturbo.net/)
-   ECUs and Tuning (https://www.miataturbo.net/ecus-tuning-54/)
-   -   maf voltage at idle (https://www.miataturbo.net/ecus-tuning-54/maf-voltage-idle-55791/)

Techsalvager 01-26-2012 05:27 PM

So I know how much grams a second to expect the engine to consume at idle and tune the maf transfer function correctly for maf mode to work correctly.

Techsalvager 09-03-2012 08:30 AM


Originally Posted by Joe Perez (Post 826854)
Why do you need to know g/s? Just install the MAF sensor and log it.

so I knew how much grams a second at idle was gonna be

richyvrlimited 09-03-2012 08:59 AM

But if it's plugged in and logging, doesn't that tell you the answer?

Techsalvager 09-03-2012 10:25 AM


Originally Posted by richyvrlimited (Post 922440)
But if it's plugged in and logging, doesn't that tell you the answer?

why would it, all that would tell me is voltage\frequency at idle not grams a second at idle

Joe Perez 09-03-2012 01:40 PM

Typically, the B engines draw around 4.5 - 5.5 grams / sec at idle in a stock configuration.

So, now that you possess this information, what fabulous thing will you do with it?

Techsalvager 09-03-2012 01:49 PM


Originally Posted by Joe Perez (Post 922494)
Typically, the B engines draw around 4.5 - 5.5 grams / sec at idle in a stock configuration.

So, now that you possess this information, what fabulous thing will you do with it?

I can see that if it with accessories running. mine is around 2.x to low 3s.

Nothing, I;ve had the info for a while now, have a way to find out mass flow at various engines speeds\loads

triple88a 09-03-2012 02:04 PM

I am guessing people are not well familiar with the maf as with map. In comparison it would be like taking a map sensor, not calibrating it or anything, just installing it and running it. Tech wants to calibrate it before he tunes it.

Techsalvager 09-03-2012 02:10 PM


Originally Posted by triple88a (Post 922500)
I am guessing people are not well familiar with the maf as with map. In comparison it would be like taking a map sensor, not calibrating it or anything, just installing it and running it. Tech wants to calibrate it before he tunes it.

Well its fairly easy to calibrate a map sensor if you have another one to go buy or a way to make pressure\vacuum and you will know pretty much its gonna be in that general area. Also if you know the low voltage and high voltage areas of a map sensor output then you know the transfer function of a map sensor as they are linear output.
Maf not so much as the installs can easily change the curve, and they are non linear output.

Anyways just to finish this thread my answer I sought for I had finally came across and is noted in here how to find out. For anyone else that later on looks and needs help.
https://docs.google.com/document/d/1...li4/edit?pli=1

Joe Perez 09-03-2012 02:51 PM

This thread is an interesting combination of trolling and over-thinking the subject.

Trolling because no civilization which has advanced beyond fire and the wheel concerns itself with mass flow in absolute units.

Over-thinking because it's not necessary to attempt to predict every possible operating condition when we have the ability to observe the engine's operating AFR with the use of an EGO sensor and plot trends using spreadsheet software.

Techsalvager 09-03-2012 03:07 PM


Originally Posted by Joe Perez (Post 922513)
This thread is an interesting combination of trolling and over-thinking the subject.

Trolling because no civilization which has advanced beyond fire and the wheel concerns itself with mass flow in absolute units.

Over-thinking because it's not necessary to attempt to predict every possible operating condition when we have the ability to observe the engine's operating AFR with the use of an EGO sensor and plot trends using spreadsheet software.

not sure where you get over thinking from but ok.


All times are GMT -4. The time now is 12:17 AM.


© 2024 MH Sub I, LLC dba Internet Brands