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Old 01-04-2004, 05:55 PM   #1
6piston
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i am converting to MAF for my E30

hi guys.

-Car: 1989 e30 325i
-Found: 1998 E39 Siemens MAF for cheap.
-Question: which pin is for what (the 4 pins)


guys,
i have always wanted to throw the AFM away for the MAF since i have the unichip which is a piggyback ecu.

can anyone tell me i'm right about this.

what i know is, the MAF and the AFM only supplies signals to the ECU telling it how much air is coming in.
-AFM has a door
-MAF has heated wire.

it's just the the amount of air is different. which is why a chip is needed to bluff the ECU.

I've asked my chip technician about the MAF conversion and he says it is highly possible for him to install and retune the chip to recognise the MAF.


so,
after some hunting i've found the 1998 E39 MAF for cheap.

i noticed the simmilarities of pins in the MAF and AFM which is 4 pins.

what i really want to know is, which pin is for what. since that is what my technician need to know as he needs it to wire it in.

does anyone has the diagram of a BMW MAF pin schematic or something which i can really use to identify the pins?

thanks, guys!
cheers
Tom
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Old 01-07-2004, 03:44 AM   #2
jimmyd1
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Believe it or not, I have the info that you are looking for. And for the simple price of.....nah here it is:

Pin 1: grey white= reference sensor
Pin 2: yellow= Air flow input
Pin 3: Blue= ground
Pin 4: Air inlet temp

Hope this helps you out. BTW, a company called Pro-M makes a direct plug and play MAF promising a 12-15 hp increase at the wheels for $699.
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Old 01-07-2004, 05:26 AM   #3
6piston
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hey jimmy!
thanks for the help!
i've written everything down.

but what i heard is it's very diffucult to tune the chip for the maf to work good...
what's your say?
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Old 01-07-2004, 06:18 AM   #4
nzer
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Quote:
Originally posted by 6piston
hey jimmy!
thanks for the help!
i've written everything down.

but what i heard is it's very diffucult to tune the chip for the maf to work good...
what's your say?
depends what chip your talking about.. what does your piggyback chip control?
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Old 01-07-2004, 06:34 AM   #5
6piston
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here's what dastek.co.za says...

"The UNICHIP is much more than just a "chip". In actual fact it is a fully functioning computer which is added to the vehicle’s existing engine control unit (ECU). Apart from controlling general timing and mixtures it can do idling control, drive extra injectors, take full control over timing functions"

i heard that the MAF and AFM supplies signals different? one exponentially and the other some other way...

is this diffciult to do?

thanks nzer!
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Old 01-07-2004, 01:40 PM   #6
NickP
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People have had success with the SMT -6 unit to add an aftermarket MAF, way better than a Split Second unit and its cheap - $200 or so US
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Old 01-07-2004, 07:51 PM   #7
kco325
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Quote:
Originally posted by jimmyd1
Pin 1: grey white= reference sensor
Pin 2: yellow= Air flow input
Pin 3: Blue= ground
Pin 4: Air inlet temp
Just a question, this is the AFM diagram correct? I have been tryingt o figure this particular mod out for a while, and the problem is not the AFM side but the fact the the MAF has a positive power, ground, and 2 senders to the ECU.
So I'm wondering, which of the 2 remaining pins (besides + and -) from the MAF is the actual Air Flow measurent.
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Old 01-08-2004, 07:29 AM   #8
jimmyd1
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You are asking the wrong person. I obtained the info from someone who successfully converted an e36 MAF to fit an e30. I believe the pins are the same for all e30 series, except for the e30 itself (what I have been informed by several people doing the coversion). Personally I have looked @ the split second, Pro-M and the BMP MAF systems that are closely related to plug and play systems.
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