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Old 06-03-2013, 07:58 PM   #1
captain E34
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M50b20 nv 6 pin maf conversion help :(

hey guys, im in the middle of swapping out my tiny 2.75 6 pin maf in my 520 for a 3.5 4 pin maf from a 540,

I started with wiring up the wires the same way as the 540 but obviously having the 6 pin (which only has 5 pins being used) I have a left over wire,

I have 12 v power and the main ground hooked up but now im left with three wires on the dme side and 2 on the maf side....

is this combination not compatible at all or do I need to do some wire running to the dme?
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Old 06-05-2013, 10:57 AM   #2
NOTORIOUS VR
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the extra wire in a MAF is usually for air temp
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Old 06-05-2013, 06:30 PM   #3
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Could i run just that wire plus + & - to a maf an sit it in the engine bay with the air temp hooked up then the rest to the new maf? Seems cheesy but will it work!,
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Old 06-10-2013, 03:04 PM   #4
NOTORIOUS VR
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If it is indeed air temp, theoretically you should be able to put the correct air temp sensor in the MAF area... but I would confirm first.

Is there a reason why you went with this type of MAF? Speak with your tuner, I'm sure he would have an idea of what you should/can be using.
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Old 06-11-2013, 09:32 AM   #5
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Well the current maf i have in my m50 cant handle over 6psi without a fuel cut soo i have a 3.5 maf for obd1 and would like to install it so i can boost to about 10 psi,

How would i go about installing an air temp senor in the new maf? Or how would i wire it up? :o

Edit..... tuner recomended the larger maf and with any m50 VANOS!, it is compatible... cuz the mafs only use 4 wires
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1988 535i M30 (Turbo Build)
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The Rest Is History...
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Last edited by captain E34; 06-11-2013 at 09:36 AM.
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Old 06-12-2013, 11:03 AM   #6
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If he recommended that MAF then he should know what to do with the extra MAF wires. ask him.
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Old 07-28-2013, 10:47 PM   #7
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You should be able to wire in a air temp sensor like Notorious said.

I'm pretty sure Miller performance makes a kit for this. Look into what they do.
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Old 07-29-2013, 11:39 AM   #8
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Asking around, i couldnt find any local help, or much info on the conversion, so what i have started to do is pull the upper section of my maf from its housing and i am going to mount it in a larger housing like 3.5 inch

P.s. pics coming soon
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1988 535i M30 (Turbo Build)
1990 520i Soon To Be S52 (Turbo Build)
1991 520i M50 (Beater)
1989 535i M30 (Beater)
1994 525it M50 (Beater)
2009 335i (Daily)
1997 M3 (Donor Car)
The Rest Is History...
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We shall seek who discover mo powa via the wheels (Shakespeare)
QUOTE FROM THE WISE... "Gap is something all the girls want and all the guys want gone"
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