How do you tune the mafam to be just right? i just don't know if i am running the mafam to high. I have it set to 12 o'clock. I think i may have the pierburg maf already as it says PTB on the top..but i could just be silly saying that. What ever the maf is, its been there since i got the car.
I remember someone saying tune it till it starts rev hunting..mine didn't do this??

Thanks :iwstupid:

Actually, i'd like to hear some comments on this topic as i've never been 100% on the MAFAM positioning. It seems to be a lot of guess work. Is there any method of getting the device perfectly set? Perhaps taking some sort of reading from the air flow sensor and adjusting until it reads a certain value at idle?

 

Only way to get it perfect is if u use some diag kit and read the maf Reading. Then you can get it just right, it's the way I work when setting ppls cars up

 

Yeah that's what i figured. Any way to read this with a scangauge you think?

 

yes scangauge should read it too. looking for the maf value.

 

Cool, any idea what it is called on the Scangauge menu, and what sort of values i should be looking for? Would be nice to have a properly set up MAFAM

 

I'd be interested in this too as I have a Pierburgh and a Scanguage fitted.

Got the guage reading MAP but that's for boost. What would be the function for getting the MAF readings?

 

Well give me a list of readings that the scangauge gives and I'll tell you which one it is

 

The Scanguage has the following guages setup:

LP - fuel system loop
IA - Intake Air Temp (either C or F)
WT - Water Temp (either C or F)
FPR - Fuel Pressure
IGN - Ignition Timing
LOD - Engine Loading
MAP - Manifold Absolute Pressure
RPM - Revs per Minute
TPS - Throttle Position Sensor

Ignoring the economy and speed ones.

I assume that IA will be the one but what temp?

Neil

 

The Scanguage has the following guages setup:

LP - fuel system loop
IA - Intake Air Temp (either C or F)
WT - Water Temp (either C or F)
FPR - Fuel Pressure
IGN - Ignition Timing
LOD - Engine Loading
MAP - Manifold Absolute Pressure
RPM - Revs per Minute
TPS - Throttle Position Sensor

Ignoring the economy and speed ones.

I assume that IA will be the one but what temp?

Neil

I'll have a look at mine when i pop outside, pretty sure i have more options than in your list though.. Don't think it will be the IA reading, as this will be totally variable. We need the air flow reading from the MAF, as this should have a specific reading at idle for example. Once we have that the MAFAM can be adjusted to read the correct value at idle, matching the readings of a fresh MAF.

That's the way i understand it anyway!

 

yer nope of those will do it, has to be air flow, or maf reading.

 

Here's a daft question... Once you've got the MAF reading, what is it suppose to be!?!

 

Do i take it from this that you have managed to read the MAF signal with the scangauge..?

 

depends on units really, but its usually max is 1200, and min around 600 on idle. Anything over 1000 on full throotle is good signal.

 

Cheers!!

Do i take it from this that you have managed to read the MAF signal with the scangauge..?

Not scangauge no, but I do have some other software on my phone that does the trick!

Will have a play after the cambelt has been changed, will also up the boost a little!

 

Looking at the Scanguage manual last night it is obvious that we need the command to the ECU that responds with the MAF reading, this is then converted into something to display.

Is there some source on the Internet to find the command/string that will return the MAF value? Further more give some idea how to manipulate the data so that it's meaningful?

Neil

 

My MAF goes from 14 g/s to 18 g/s

or 1.4 to 2.4 kg (I think) depending on which scale I use.


I have no idea what the ideal value should be.

 

Sounds weird, I can't remember off the top of my head wat units is the usual.

 

The Xguage someone on the 45 forum pointed me to displays the reading in grams per second so I don't know where the optimum point is? 2 digits will be displayed.

Neil

 

i done that and got idle at 18 and at top end with foot on floor 240

 

So the greater the reading at full throttle the better or is it more subtle than that?

 

yes you want a good signal, but not too high as you will get faults. It needs to be set to a maximum, and like i said with the diagnostic kit i have 1200 is maximum, so usually over 1000 on full throotle is a good signal. From my experience the signal usually decreases through the revs, eg. at 2k rpm you would get full signal around 1000-1200 and then tapering off to 900 odd at 4k rpm. But again without knowing the values of what the diagnostic is using i cant really tell you values to look for.

 

I have input the XGuage that someone found on the Internet, this gives a readout with 1 decimal place. It is calibrated to grammes per second.

So at idle I'm getting about 25, but this goes up and down and could be as low as 12. I noticed on the motorway that the reading went up to 78 when acclerating off a slip road.

I'm not too sure whether:

a) I'm getting the correct command
b) the Xgauge is using the right units

Has anyone else used the grammes per second units?

My MAFAM is set to 3 o'clock and I have a Pierburgh MAF.

Neil :-|

 

I have input the XGuage that someone found on the Internet, this gives a readout with 1 decimal place. It is calibrated to grammes per second.

So at idle I'm getting about 25, but this goes up and down and could be as low as 12. I noticed on the motorway that the reading went up to 78 when acclerating off a slip road.

I'm not too sure whether:

a) I'm getting the correct command
b) the Xgauge is using the right units

Has anyone else used the grammes per second units?

My MAFAM is set to 3 o'clock and I have a Pierburgh MAF.

Neil :-|

Can you find the details of the xgauge you used please? Cheers

 

My software reports the MAF value in grammes per second, will check what it is on the way to work in a min and report back

 

Cold Idle: 18
Warm Idle: 9
'Attack Mode': 114

Cold idle is straight after start, Warm idle is after a 23 mile A-road blast, 'Attack Mode' is a 3rd gear run at full throttle

Original (4 year old, 97k mile) MAF with MAFAM at 12 O'clock position

EDIT: So, does anyone know what the readings should be? :lol:

 

All that i did was connect a multimeter and get the best voltage reading whilst on boost.(4.27 volts..midday position)

Owen.

 

This is mine at a cold idle, i'll go out in a bit and get some full throttle readings.

 

Right, warm idle is 8 g/s and the highest her indoors saw it go was 111g/s.

This is on my stock 04 101 ZS with the standard (and original) MAF.

 

I think Matt saw mine on the dyno go to around 1100 also so i guess that was in mg\s rather than g\s...

However mine gets slightly altered by having the hybrid - as when i plug my MAFAM in it goes into default settings as i guess it is then detecting much higher air flow than it thinks is possible...

 

well like i said over 1000 is dead on, so you dont really need mafam in, as this will prob bring it over the 1200 max and cause faults.

I use the same digimoto software on my own diag setup and i usually keep the figure under 40 on full throotle. I think the readings from the scanguage arent accurate, or havent been setup right to read the right information from the ecu.

edit - just looked up on internet there, the g/s should be giving the proper 1000-1200 reading, i know my digimoto software is setup for a different unit, but i havent got the laptop here to look. So im guesssing the scanguage isnt working correctly.

 

The OBD software on my phone is reading pretty much the same values as Bob, so I would suggest that unless both the Scanguage and my software is wrong (which I doubt) then your readings are out or is using the wrong unit?